/* parse.y - Yacc grammar for bash. */ /* Copyright (C) 1989-2009 Free Software Foundation, Inc. This file is part of GNU Bash, the Bourne Again SHell. Bash is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Bash is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Bash. If not, see . */ %{ #include "config.h" #include "bashtypes.h" #include "bashansi.h" #include "filecntl.h" #if defined (HAVE_UNISTD_H) # include #endif #if defined (HAVE_LOCALE_H) # include #endif #include #include "chartypes.h" #include #include "memalloc.h" #include "bashintl.h" #define NEED_STRFTIME_DECL /* used in externs.h */ #include "shell.h" #include "trap.h" #include "flags.h" #include "parser.h" #include "mailcheck.h" #include "test.h" #include "builtins.h" #include "builtins/common.h" #include "builtins/builtext.h" #include "shmbutil.h" #if defined (READLINE) # include "bashline.h" # include #endif /* READLINE */ #if defined (HISTORY) # include "bashhist.h" # include #endif /* HISTORY */ #if defined (JOB_CONTROL) # include "jobs.h" #endif /* JOB_CONTROL */ #if defined (ALIAS) # include "alias.h" #else typedef void *alias_t; #endif /* ALIAS */ #if defined (PROMPT_STRING_DECODE) # ifndef _MINIX # include # endif # include # if defined (TM_IN_SYS_TIME) # include # include # endif /* TM_IN_SYS_TIME */ # include "maxpath.h" #endif /* PROMPT_STRING_DECODE */ #define RE_READ_TOKEN -99 #define NO_EXPANSION -100 #ifdef DEBUG # define YYDEBUG 1 #else # define YYDEBUG 0 #endif #if defined (HANDLE_MULTIBYTE) # define last_shell_getc_is_singlebyte \ ((shell_input_line_index > 1) \ ? shell_input_line_property[shell_input_line_index - 1] \ : 1) # define MBTEST(x) ((x) && last_shell_getc_is_singlebyte) #else # define last_shell_getc_is_singlebyte 1 # define MBTEST(x) ((x)) #endif #if defined (EXTENDED_GLOB) extern int extended_glob; #endif extern int eof_encountered; extern int no_line_editing, running_under_emacs; extern int current_command_number; extern int sourcelevel, parse_and_execute_level; extern int posixly_correct; extern int last_command_exit_value; extern pid_t last_command_subst_pid; extern char *shell_name, *current_host_name; extern char *dist_version; extern int patch_level; extern int dump_translatable_strings, dump_po_strings; extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin; #if defined (BUFFERED_INPUT) extern int bash_input_fd_changed; #endif extern int errno; /* **************************************************************** */ /* */ /* "Forward" declarations */ /* */ /* **************************************************************** */ #ifdef DEBUG static void debug_parser __P((int)); #endif static int yy_getc __P((void)); static int yy_ungetc __P((int)); #if defined (READLINE) static int yy_readline_get __P((void)); static int yy_readline_unget __P((int)); #endif static int yy_string_get __P((void)); static int yy_string_unget __P((int)); static void rewind_input_string __P((void)); static int yy_stream_get __P((void)); static int yy_stream_unget __P((int)); static int shell_getc __P((int)); static void shell_ungetc __P((int)); static void discard_until __P((int)); #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) static void push_string __P((char *, int, alias_t *)); static void pop_string __P((void)); static void free_string_list __P((void)); #endif static char *read_a_line __P((int)); static int reserved_word_acceptable __P((int)); static int yylex __P((void)); static int alias_expand_token __P((char *)); static int time_command_acceptable __P((void)); static int special_case_tokens __P((char *)); static int read_token __P((int)); static char *parse_matched_pair __P((int, int, int, int *, int)); static char *parse_comsub __P((int, int, int, int *, int)); #if defined (ARRAY_VARS) static char *parse_compound_assignment __P((int *)); #endif #if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND) static int parse_dparen __P((int)); static int parse_arith_cmd __P((char **, int)); #endif #if defined (COND_COMMAND) static void cond_error __P((void)); static COND_COM *cond_expr __P((void)); static COND_COM *cond_or __P((void)); static COND_COM *cond_and __P((void)); static COND_COM *cond_term __P((void)); static int cond_skip_newlines __P((void)); static COMMAND *parse_cond_command __P((void)); #endif #if defined (ARRAY_VARS) static int token_is_assignment __P((char *, int)); static int token_is_ident __P((char *, int)); #endif static int read_token_word __P((int)); static void discard_parser_constructs __P((int)); static char *error_token_from_token __P((int)); static char *error_token_from_text __P((void)); static void print_offending_line __P((void)); static void report_syntax_error __P((char *)); static void handle_eof_input_unit __P((void)); static void prompt_again __P((void)); #if 0 static void reset_readline_prompt __P((void)); #endif static void print_prompt __P((void)); #if defined (HANDLE_MULTIBYTE) static void set_line_mbstate __P((void)); static char *shell_input_line_property = NULL; #else # define set_line_mbstate() #endif extern int yyerror __P((const char *)); #ifdef DEBUG extern int yydebug; #endif /* Default prompt strings */ char *primary_prompt = PPROMPT; char *secondary_prompt = SPROMPT; /* PROMPT_STRING_POINTER points to one of these, never to an actual string. */ char *ps1_prompt, *ps2_prompt; /* Handle on the current prompt string. Indirectly points through ps1_ or ps2_prompt. */ char **prompt_string_pointer = (char **)NULL; char *current_prompt_string; /* Non-zero means we expand aliases in commands. */ int expand_aliases = 0; /* If non-zero, the decoded prompt string undergoes parameter and variable substitution, command substitution, arithmetic substitution, string expansion, process substitution, and quote removal in decode_prompt_string. */ int promptvars = 1; /* If non-zero, $'...' and $"..." are expanded when they appear within a ${...} expansion, even when the expansion appears within double quotes. */ int extended_quote = 1; /* The number of lines read from input while creating the current command. */ int current_command_line_count; /* The token that currently denotes the end of parse. */ int shell_eof_token; /* The token currently being read. */ int current_token; /* The current parser state. */ int parser_state; /* Variables to manage the task of reading here documents, because we need to defer the reading until after a complete command has been collected. */ static REDIRECT *redir_stack[10]; int need_here_doc; /* Where shell input comes from. History expansion is performed on each line when the shell is interactive. */ static char *shell_input_line = (char *)NULL; static int shell_input_line_index; static int shell_input_line_size; /* Amount allocated for shell_input_line. */ static int shell_input_line_len; /* strlen (shell_input_line) */ /* Either zero or EOF. */ static int shell_input_line_terminator; /* The line number in a script on which a function definition starts. */ static int function_dstart; /* The line number in a script on which a function body starts. */ static int function_bstart; /* The line number in a script at which an arithmetic for command starts. */ static int arith_for_lineno; /* The decoded prompt string. Used if READLINE is not defined or if editing is turned off. Analogous to current_readline_prompt. */ static char *current_decoded_prompt; /* The last read token, or NULL. read_token () uses this for context checking. */ static int last_read_token; /* The token read prior to last_read_token. */ static int token_before_that; /* The token read prior to token_before_that. */ static int two_tokens_ago; static int global_extglob; /* The line number in a script where the word in a `case WORD', `select WORD' or `for WORD' begins. This is a nested command maximum, since the array index is decremented after a case, select, or for command is parsed. */ #define MAX_CASE_NEST 128 static int word_lineno[MAX_CASE_NEST]; static int word_top = -1; /* If non-zero, it is the token that we want read_token to return regardless of what text is (or isn't) present to be read. This is reset by read_token. If token_to_read == WORD or ASSIGNMENT_WORD, yylval.word should be set to word_desc_to_read. */ static int token_to_read; static WORD_DESC *word_desc_to_read; static REDIRECTEE source; static REDIRECTEE redir; %} %union { WORD_DESC *word; /* the word that we read. */ int number; /* the number that we read. */ WORD_LIST *word_list; COMMAND *command; REDIRECT *redirect; ELEMENT element; PATTERN_LIST *pattern; } /* Reserved words. Members of the first group are only recognized in the case that they are preceded by a list_terminator. Members of the second group are for [[...]] commands. Members of the third group are recognized only under special circumstances. */ %token IF THEN ELSE ELIF FI CASE ESAC FOR SELECT WHILE UNTIL DO DONE FUNCTION COPROC %token COND_START COND_END COND_ERROR %token IN BANG TIME TIMEOPT /* More general tokens. yylex () knows how to make these. */ %token WORD ASSIGNMENT_WORD REDIR_WORD %token NUMBER %token ARITH_CMD ARITH_FOR_EXPRS %token COND_CMD %token AND_AND OR_OR GREATER_GREATER LESS_LESS LESS_AND LESS_LESS_LESS %token GREATER_AND SEMI_SEMI SEMI_AND SEMI_SEMI_AND %token LESS_LESS_MINUS AND_GREATER AND_GREATER_GREATER LESS_GREATER %token GREATER_BAR BAR_AND /* The types that the various syntactical units return. */ %type inputunit command pipeline pipeline_command %type list list0 list1 compound_list simple_list simple_list1 %type simple_command shell_command %type for_command select_command case_command group_command %type arith_command %type cond_command %type arith_for_command %type coproc %type function_def function_body if_command elif_clause subshell %type redirection redirection_list %type simple_command_element %type word_list pattern %type pattern_list case_clause_sequence case_clause %type timespec %type list_terminator %start inputunit %left '&' ';' '\n' yacc_EOF %left AND_AND OR_OR %right '|' BAR_AND %% inputunit: simple_list simple_list_terminator { /* Case of regular command. Discard the error safety net,and return the command just parsed. */ global_command = $1; eof_encountered = 0; /* discard_parser_constructs (0); */ if (parser_state & PST_CMDSUBST) parser_state |= PST_EOFTOKEN; YYACCEPT; } | '\n' { /* Case of regular command, but not a very interesting one. Return a NULL command. */ global_command = (COMMAND *)NULL; if (parser_state & PST_CMDSUBST) parser_state |= PST_EOFTOKEN; YYACCEPT; } | error '\n' { /* Error during parsing. Return NULL command. */ global_command = (COMMAND *)NULL; eof_encountered = 0; /* discard_parser_constructs (1); */ if (interactive && parse_and_execute_level == 0) { YYACCEPT; } else { YYABORT; } } | yacc_EOF { /* Case of EOF seen by itself. Do ignoreeof or not. */ global_command = (COMMAND *)NULL; handle_eof_input_unit (); YYACCEPT; } ; word_list: WORD { $$ = make_word_list ($1, (WORD_LIST *)NULL); } | word_list WORD { $$ = make_word_list ($2, $1); } ; redirection: '>' WORD { source.dest = 1; redir.filename = $2; $$ = make_redirection (source, r_output_direction, redir, 0); } | '<' WORD { source.dest = 0; redir.filename = $2; $$ = make_redirection (source, r_input_direction, redir, 0); } | NUMBER '>' WORD { source.dest = $1; redir.filename = $3; $$ = make_redirection (source, r_output_direction, redir, 0); } | NUMBER '<' WORD { source.dest = $1; redir.filename = $3; $$ = make_redirection (source, r_input_direction, redir, 0); } | REDIR_WORD '>' WORD { source.filename = $1; redir.filename = $3; $$ = make_redirection (source, r_output_direction, redir, REDIR_VARASSIGN); } | REDIR_WORD '<' WORD { source.filename = $1; redir.filename = $3; $$ = make_redirection (source, r_input_direction, redir, REDIR_VARASSIGN); } | GREATER_GREATER WORD { source.dest = 1; redir.filename = $2; $$ = make_redirection (source, r_appending_to, redir, 0); } | NUMBER GREATER_GREATER WORD { source.dest = $1; redir.filename = $3; $$ = make_redirection (source, r_appending_to, redir, 0); } | REDIR_WORD GREATER_GREATER WORD { source.filename = $1; redir.filename = $3; $$ = make_redirection (source, r_appending_to, redir, REDIR_VARASSIGN); } | GREATER_BAR WORD { source.dest = 1; redir.filename = $2; $$ = make_redirection (source, r_output_force, redir, 0); } | NUMBER GREATER_BAR WORD { source.dest = $1; redir.filename = $3; $$ = make_redirection (source, r_output_force, redir, 0); } | REDIR_WORD GREATER_BAR WORD { source.filename = $1; redir.filename = $3; $$ = make_redirection (source, r_output_force, redir, REDIR_VARASSIGN); } | LESS_GREATER WORD { source.dest = 0; redir.filename = $2; $$ = make_redirection (source, r_input_output, redir, 0); } | NUMBER LESS_GREATER WORD { source.dest = $1; redir.filename = $3; $$ = make_redirection (source, r_input_output, redir, 0); } | REDIR_WORD LESS_GREATER WORD { source.filename = $1; redir.filename = $3; $$ = make_redirection (source, r_input_output, redir, REDIR_VARASSIGN); } | LESS_LESS WORD { source.dest = 0; redir.filename = $2; $$ = make_redirection (source, r_reading_until, redir, 0); redir_stack[need_here_doc++] = $$; } | NUMBER LESS_LESS WORD { source.dest = $1; redir.filename = $3; $$ = make_redirection (source, r_reading_until, redir, 0); redir_stack[need_here_doc++] = $$; } | REDIR_WORD LESS_LESS WORD { source.filename = $1; redir.filename = $3; $$ = make_redirection (source, r_reading_until, redir, REDIR_VARASSIGN); redir_stack[need_here_doc++] = $$; } | LESS_LESS_MINUS WORD { source.dest = 0; redir.filename = $2; $$ = make_redirection (source, r_deblank_reading_until, redir, 0); redir_stack[need_here_doc++] = $$; } | NUMBER LESS_LESS_MINUS WORD { source.dest = $1; redir.filename = $3; $$ = make_redirection (source, r_deblank_reading_until, redir, 0); redir_stack[need_here_doc++] = $$; } | REDIR_WORD LESS_LESS_MINUS WORD { source.filename = $1; redir.filename = $3; $$ = make_redirection (source, r_deblank_reading_until, redir, REDIR_VARASSIGN); redir_stack[need_here_doc++] = $$; } | LESS_LESS_LESS WORD { source.dest = 0; redir.filename = $2; $$ = make_redirection (source, r_reading_string, redir, 0); } | NUMBER LESS_LESS_LESS WORD { source.dest = $1; redir.filename = $3; $$ = make_redirection (source, r_reading_string, redir, 0); } | REDIR_WORD LESS_LESS_LESS WORD { source.filename = $1; redir.filename = $3; $$ = make_redirection (source, r_reading_string, redir, REDIR_VARASSIGN); } | LESS_AND NUMBER { source.dest = 0; redir.dest = $2; $$ = make_redirection (source, r_duplicating_input, redir, 0); } | NUMBER LESS_AND NUMBER { source.dest = $1; redir.dest = $3; $$ = make_redirection (source, r_duplicating_input, redir, 0); } | REDIR_WORD LESS_AND NUMBER { source.filename = $1; redir.dest = $3; $$ = make_redirection (source, r_duplicating_input, redir, REDIR_VARASSIGN); } | GREATER_AND NUMBER { source.dest = 1; redir.dest = $2; $$ = make_redirection (source, r_duplicating_output, redir, 0); } | NUMBER GREATER_AND NUMBER { source.dest = $1; redir.dest = $3; $$ = make_redirection (source, r_duplicating_output, redir, 0); } | REDIR_WORD GREATER_AND NUMBER { source.filename = $1; redir.dest = $3; $$ = make_redirection (source, r_duplicating_output, redir, REDIR_VARASSIGN); } | LESS_AND WORD { source.dest = 0; redir.filename = $2; $$ = make_redirection (source, r_duplicating_input_word, redir, 0); } | NUMBER LESS_AND WORD { source.dest = $1; redir.filename = $3; $$ = make_redirection (source, r_duplicating_input_word, redir, 0); } | REDIR_WORD LESS_AND WORD { source.filename = $1; redir.filename = $3; $$ = make_redirection (source, r_duplicating_input_word, redir, REDIR_VARASSIGN); } | GREATER_AND WORD { source.dest = 1; redir.filename = $2; $$ = make_redirection (source, r_duplicating_output_word, redir, 0); } | NUMBER GREATER_AND WORD { source.dest = $1; redir.filename = $3; $$ = make_redirection (source, r_duplicating_output_word, redir, 0); } | REDIR_WORD GREATER_AND WORD { source.filename = $1; redir.filename = $3; $$ = make_redirection (source, r_duplicating_output_word, redir, REDIR_VARASSIGN); } | GREATER_AND '-' { source.dest = 1; redir.dest = 0; $$ = make_redirection (source, r_close_this, redir, 0); } | NUMBER GREATER_AND '-' { source.dest = $1; redir.dest = 0; $$ = make_redirection (source, r_close_this, redir, 0); } | REDIR_WORD GREATER_AND '-' { source.filename = $1; redir.dest = 0; $$ = make_redirection (source, r_close_this, redir, REDIR_VARASSIGN); } | LESS_AND '-' { source.dest = 0; redir.dest = 0; $$ = make_redirection (source, r_close_this, redir, 0); } | NUMBER LESS_AND '-' { source.dest = $1; redir.dest = 0; $$ = make_redirection (source, r_close_this, redir, 0); } | REDIR_WORD LESS_AND '-' { source.filename = $1; redir.dest = 0; $$ = make_redirection (source, r_close_this, redir, REDIR_VARASSIGN); } | AND_GREATER WORD { source.dest = 1; redir.filename = $2; $$ = make_redirection (source, r_err_and_out, redir, 0); } | AND_GREATER_GREATER WORD { source.dest = 1; redir.filename = $2; $$ = make_redirection (source, r_append_err_and_out, redir, 0); } ; simple_command_element: WORD { $$.word = $1; $$.redirect = 0; } | ASSIGNMENT_WORD { $$.word = $1; $$.redirect = 0; } | redirection { $$.redirect = $1; $$.word = 0; } ; redirection_list: redirection { $$ = $1; } | redirection_list redirection { register REDIRECT *t; for (t = $1; t->next; t = t->next) ; t->next = $2; $$ = $1; } ; simple_command: simple_command_element { $$ = make_simple_command ($1, (COMMAND *)NULL); } | simple_command simple_command_element { $$ = make_simple_command ($2, $1); } ; command: simple_command { $$ = clean_simple_command ($1); } | shell_command { $$ = $1; } | shell_command redirection_list { COMMAND *tc; tc = $1; if (tc->redirects) { register REDIRECT *t; for (t = tc->redirects; t->next; t = t->next) ; t->next = $2; } else tc->redirects = $2; $$ = $1; } | function_def { $$ = $1; } | coproc { $$ = $1; } ; shell_command: for_command { $$ = $1; } | case_command { $$ = $1; } | WHILE compound_list DO compound_list DONE { $$ = make_while_command ($2, $4); } | UNTIL compound_list DO compound_list DONE { $$ = make_until_command ($2, $4); } | select_command { $$ = $1; } | if_command { $$ = $1; } | subshell { $$ = $1; } | group_command { $$ = $1; } | arith_command { $$ = $1; } | cond_command { $$ = $1; } | arith_for_command { $$ = $1; } ; for_command: FOR WORD newline_list DO compound_list DONE { $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]); if (word_top > 0) word_top--; } | FOR WORD newline_list '{' compound_list '}' { $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]); if (word_top > 0) word_top--; } | FOR WORD ';' newline_list DO compound_list DONE { $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]); if (word_top > 0) word_top--; } | FOR WORD ';' newline_list '{' compound_list '}' { $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]); if (word_top > 0) word_top--; } | FOR WORD newline_list IN word_list list_terminator newline_list DO compound_list DONE { $$ = make_for_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]); if (word_top > 0) word_top--; } | FOR WORD newline_list IN word_list list_terminator newline_list '{' compound_list '}' { $$ = make_for_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]); if (word_top > 0) word_top--; } | FOR WORD newline_list IN list_terminator newline_list DO compound_list DONE { $$ = make_for_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]); if (word_top > 0) word_top--; } | FOR WORD newline_list IN list_terminator newline_list '{' compound_list '}' { $$ = make_for_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]); if (word_top > 0) word_top--; } ; arith_for_command: FOR ARITH_FOR_EXPRS list_terminator newline_list DO compound_list DONE { $$ = make_arith_for_command ($2, $6, arith_for_lineno); if (word_top > 0) word_top--; } | FOR ARITH_FOR_EXPRS list_terminator newline_list '{' compound_list '}' { $$ = make_arith_for_command ($2, $6, arith_for_lineno); if (word_top > 0) word_top--; } | FOR ARITH_FOR_EXPRS DO compound_list DONE { $$ = make_arith_for_command ($2, $4, arith_for_lineno); if (word_top > 0) word_top--; } | FOR ARITH_FOR_EXPRS '{' compound_list '}' { $$ = make_arith_for_command ($2, $4, arith_for_lineno); if (word_top > 0) word_top--; } ; select_command: SELECT WORD newline_list DO list DONE { $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]); if (word_top > 0) word_top--; } | SELECT WORD newline_list '{' list '}' { $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]); if (word_top > 0) word_top--; } | SELECT WORD ';' newline_list DO list DONE { $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]); if (word_top > 0) word_top--; } | SELECT WORD ';' newline_list '{' list '}' { $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]); if (word_top > 0) word_top--; } | SELECT WORD newline_list IN word_list list_terminator newline_list DO list DONE { $$ = make_select_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]); if (word_top > 0) word_top--; } | SELECT WORD newline_list IN word_list list_terminator newline_list '{' list '}' { $$ = make_select_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]); if (word_top > 0) word_top--; } ; case_command: CASE WORD newline_list IN newline_list ESAC { $$ = make_case_command ($2, (PATTERN_LIST *)NULL, word_lineno[word_top]); if (word_top > 0) word_top--; } | CASE WORD newline_list IN case_clause_sequence newline_list ESAC { $$ = make_case_command ($2, $5, word_lineno[word_top]); if (word_top > 0) word_top--; } | CASE WORD newline_list IN case_clause ESAC { $$ = make_case_command ($2, $5, word_lineno[word_top]); if (word_top > 0) word_top--; } ; function_def: WORD '(' ')' newline_list function_body { $$ = make_function_def ($1, $5, function_dstart, function_bstart); } | FUNCTION WORD '(' ')' newline_list function_body { $$ = make_function_def ($2, $6, function_dstart, function_bstart); } | FUNCTION WORD newline_list function_body { $$ = make_function_def ($2, $4, function_dstart, function_bstart); } ; function_body: shell_command { $$ = $1; } | shell_command redirection_list { COMMAND *tc; tc = $1; /* According to Posix.2 3.9.5, redirections specified after the body of a function should be attached to the function and performed when the function is executed, not as part of the function definition command. */ /* XXX - I don't think it matters, but we might want to change this in the future to avoid problems differentiating between a function definition with a redirection and a function definition containing a single command with a redirection. The two are semantically equivalent, though -- the only difference is in how the command printing code displays the redirections. */ if (tc->redirects) { register REDIRECT *t; for (t = tc->redirects; t->next; t = t->next) ; t->next = $2; } else tc->redirects = $2; $$ = $1; } ; subshell: '(' compound_list ')' { $$ = make_subshell_command ($2); $$->flags |= CMD_WANT_SUBSHELL; } ; coproc: COPROC shell_command { $$ = make_coproc_command ("COPROC", $2); $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL; } | COPROC shell_command redirection_list { COMMAND *tc; tc = $2; if (tc->redirects) { register REDIRECT *t; for (t = tc->redirects; t->next; t = t->next) ; t->next = $3; } else tc->redirects = $3; $$ = make_coproc_command ("COPROC", $2); $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL; } | COPROC WORD shell_command { $$ = make_coproc_command ($2->word, $3); $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL; } | COPROC WORD shell_command redirection_list { COMMAND *tc; tc = $3; if (tc->redirects) { register REDIRECT *t; for (t = tc->redirects; t->next; t = t->next) ; t->next = $4; } else tc->redirects = $4; $$ = make_coproc_command ($2->word, $3); $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL; } | COPROC simple_command { $$ = make_coproc_command ("COPROC", clean_simple_command ($2)); $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL; } ; if_command: IF compound_list THEN compound_list FI { $$ = make_if_command ($2, $4, (COMMAND *)NULL); } | IF compound_list THEN compound_list ELSE compound_list FI { $$ = make_if_command ($2, $4, $6); } | IF compound_list THEN compound_list elif_clause FI { $$ = make_if_command ($2, $4, $5); } ; group_command: '{' compound_list '}' { $$ = make_group_command ($2); } ; arith_command: ARITH_CMD { $$ = make_arith_command ($1); } ; cond_command: COND_START COND_CMD COND_END { $$ = $2; } ; elif_clause: ELIF compound_list THEN compound_list { $$ = make_if_command ($2, $4, (COMMAND *)NULL); } | ELIF compound_list THEN compound_list ELSE compound_list { $$ = make_if_command ($2, $4, $6); } | ELIF compound_list THEN compound_list elif_clause { $$ = make_if_command ($2, $4, $5); } ; case_clause: pattern_list | case_clause_sequence pattern_list { $2->next = $1; $$ = $2; } ; pattern_list: newline_list pattern ')' compound_list { $$ = make_pattern_list ($2, $4); } | newline_list pattern ')' newline_list { $$ = make_pattern_list ($2, (COMMAND *)NULL); } | newline_list '(' pattern ')' compound_list { $$ = make_pattern_list ($3, $5); } | newline_list '(' pattern ')' newline_list { $$ = make_pattern_list ($3, (COMMAND *)NULL); } ; case_clause_sequence: pattern_list SEMI_SEMI { $$ = $1; } | case_clause_sequence pattern_list SEMI_SEMI { $2->next = $1; $$ = $2; } | pattern_list SEMI_AND { $1->flags |= CASEPAT_FALLTHROUGH; $$ = $1; } | case_clause_sequence pattern_list SEMI_AND { $2->flags |= CASEPAT_FALLTHROUGH; $2->next = $1; $$ = $2; } | pattern_list SEMI_SEMI_AND { $1->flags |= CASEPAT_TESTNEXT; $$ = $1; } | case_clause_sequence pattern_list SEMI_SEMI_AND { $2->flags |= CASEPAT_TESTNEXT; $2->next = $1; $$ = $2; } ; pattern: WORD { $$ = make_word_list ($1, (WORD_LIST *)NULL); } | pattern '|' WORD { $$ = make_word_list ($3, $1); } ; /* A list allows leading or trailing newlines and newlines as operators (equivalent to semicolons). It must end with a newline or semicolon. Lists are used within commands such as if, for, while. */ list: newline_list list0 { $$ = $2; if (need_here_doc) gather_here_documents (); } ; compound_list: list | newline_list list1 { $$ = $2; } ; list0: list1 '\n' newline_list | list1 '&' newline_list { if ($1->type == cm_connection) $$ = connect_async_list ($1, (COMMAND *)NULL, '&'); else $$ = command_connect ($1, (COMMAND *)NULL, '&'); } | list1 ';' newline_list ; list1: list1 AND_AND newline_list list1 { $$ = command_connect ($1, $4, AND_AND); } | list1 OR_OR newline_list list1 { $$ = command_connect ($1, $4, OR_OR); } | list1 '&' newline_list list1 { if ($1->type == cm_connection) $$ = connect_async_list ($1, $4, '&'); else $$ = command_connect ($1, $4, '&'); } | list1 ';' newline_list list1 { $$ = command_connect ($1, $4, ';'); } | list1 '\n' newline_list list1 { $$ = command_connect ($1, $4, ';'); } | pipeline_command { $$ = $1; } ; simple_list_terminator: '\n' | yacc_EOF ; list_terminator:'\n' { $$ = '\n'; } | ';' { $$ = ';'; } | yacc_EOF { $$ = yacc_EOF; } ; newline_list: | newline_list '\n' ; /* A simple_list is a list that contains no significant newlines and no leading or trailing newlines. Newlines are allowed only following operators, where they are not significant. This is what an inputunit consists of. */ simple_list: simple_list1 { $$ = $1; if (need_here_doc) gather_here_documents (); if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token) { global_command = $1; eof_encountered = 0; rewind_input_string (); YYACCEPT; } } | simple_list1 '&' { if ($1->type == cm_connection) $$ = connect_async_list ($1, (COMMAND *)NULL, '&'); else $$ = command_connect ($1, (COMMAND *)NULL, '&'); if (need_here_doc) gather_here_documents (); if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token) { global_command = $1; eof_encountered = 0; rewind_input_string (); YYACCEPT; } } | simple_list1 ';' { $$ = $1; if (need_here_doc) gather_here_documents (); if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token) { global_command = $1; eof_encountered = 0; rewind_input_string (); YYACCEPT; } } ; simple_list1: simple_list1 AND_AND newline_list simple_list1 { $$ = command_connect ($1, $4, AND_AND); } | simple_list1 OR_OR newline_list simple_list1 { $$ = command_connect ($1, $4, OR_OR); } | simple_list1 '&' simple_list1 { if ($1->type == cm_connection) $$ = connect_async_list ($1, $3, '&'); else $$ = command_connect ($1, $3, '&'); } | simple_list1 ';' simple_list1 { $$ = command_connect ($1, $3, ';'); } | pipeline_command { $$ = $1; } ; pipeline_command: pipeline { $$ = $1; } | BANG pipeline { if ($2) $2->flags |= CMD_INVERT_RETURN; $$ = $2; } | timespec pipeline { if ($2) $2->flags |= $1; $$ = $2; } | timespec BANG pipeline { if ($3) $3->flags |= $1|CMD_INVERT_RETURN; $$ = $3; } | BANG timespec pipeline { if ($3) $3->flags |= $2|CMD_INVERT_RETURN; $$ = $3; } | timespec list_terminator { ELEMENT x; /* Boy, this is unclean. `time' by itself can time a null command. We cheat and push a newline back if the list_terminator was a newline to avoid the double-newline problem (one to terminate this, one to terminate the command) */ x.word = 0; x.redirect = 0; $$ = make_simple_command (x, (COMMAND *)NULL); $$->flags |= $1; /* XXX - let's cheat and push a newline back */ if ($2 == '\n') token_to_read = '\n'; } ; pipeline: pipeline '|' newline_list pipeline { $$ = command_connect ($1, $4, '|'); } | pipeline BAR_AND newline_list pipeline { /* Make cmd1 |& cmd2 equivalent to cmd1 2>&1 | cmd2 */ COMMAND *tc; REDIRECTEE rd, sd; REDIRECT *r; tc = $1->type == cm_simple ? (COMMAND *)$1->value.Simple : $1; sd.dest = 2; rd.dest = 1; r = make_redirection (sd, r_duplicating_output, rd, 0); if (tc->redirects) { register REDIRECT *t; for (t = tc->redirects; t->next; t = t->next) ; t->next = r; } else tc->redirects = r; $$ = command_connect ($1, $4, '|'); } | command { $$ = $1; } ; timespec: TIME { $$ = CMD_TIME_PIPELINE; } | TIME TIMEOPT { $$ = CMD_TIME_PIPELINE|CMD_TIME_POSIX; } ; %% /* Initial size to allocate for tokens, and the amount to grow them by. */ #define TOKEN_DEFAULT_INITIAL_SIZE 496 #define TOKEN_DEFAULT_GROW_SIZE 512 /* Should we call prompt_again? */ #define SHOULD_PROMPT() \ (interactive && (bash_input.type == st_stdin || bash_input.type == st_stream)) #if defined (ALIAS) # define expanding_alias() (pushed_string_list && pushed_string_list->expander) #else # define expanding_alias() 0 #endif /* Global var is non-zero when end of file has been reached. */ int EOF_Reached = 0; #ifdef DEBUG static void debug_parser (i) int i; { #if YYDEBUG != 0 yydebug = i; #endif } #endif /* yy_getc () returns the next available character from input or EOF. yy_ungetc (c) makes `c' the next character to read. init_yy_io (get, unget, type, location) makes the function GET the installed function for getting the next character, makes UNGET the installed function for un-getting a character, sets the type of stream (either string or file) from TYPE, and makes LOCATION point to where the input is coming from. */ /* Unconditionally returns end-of-file. */ int return_EOF () { return (EOF); } /* Variable containing the current get and unget functions. See ./input.h for a clearer description. */ BASH_INPUT bash_input; /* Set all of the fields in BASH_INPUT to NULL. Free bash_input.name if it is non-null, avoiding a memory leak. */ void initialize_bash_input () { bash_input.type = st_none; FREE (bash_input.name); bash_input.name = (char *)NULL; bash_input.location.file = (FILE *)NULL; bash_input.location.string = (char *)NULL; bash_input.getter = (sh_cget_func_t *)NULL; bash_input.ungetter = (sh_cunget_func_t *)NULL; } /* Set the contents of the current bash input stream from GET, UNGET, TYPE, NAME, and LOCATION. */ void init_yy_io (get, unget, type, name, location) sh_cget_func_t *get; sh_cunget_func_t *unget; enum stream_type type; const char *name; INPUT_STREAM location; { bash_input.type = type; FREE (bash_input.name); bash_input.name = name ? savestring (name) : (char *)NULL; /* XXX */ #if defined (CRAY) memcpy((char *)&bash_input.location.string, (char *)&location.string, sizeof(location)); #else bash_input.location = location; #endif bash_input.getter = get; bash_input.ungetter = unget; } char * yy_input_name () { return (bash_input.name ? bash_input.name : "stdin"); } /* Call this to get the next character of input. */ static int yy_getc () { return (*(bash_input.getter)) (); } /* Call this to unget C. That is, to make C the next character to be read. */ static int yy_ungetc (c) int c; { return (*(bash_input.ungetter)) (c); } #if defined (BUFFERED_INPUT) #ifdef INCLUDE_UNUSED int input_file_descriptor () { switch (bash_input.type) { case st_stream: return (fileno (bash_input.location.file)); case st_bstream: return (bash_input.location.buffered_fd); case st_stdin: default: return (fileno (stdin)); } } #endif #endif /* BUFFERED_INPUT */ /* **************************************************************** */ /* */ /* Let input be read from readline (). */ /* */ /* **************************************************************** */ #if defined (READLINE) char *current_readline_prompt = (char *)NULL; char *current_readline_line = (char *)NULL; int current_readline_line_index = 0; static int yy_readline_get () { SigHandler *old_sigint; int line_len; unsigned char c; if (!current_readline_line) { if (!bash_readline_initialized) initialize_readline (); #if defined (JOB_CONTROL) if (job_control) give_terminal_to (shell_pgrp, 0); #endif /* JOB_CONTROL */ old_sigint = (SigHandler *)NULL; if (signal_is_ignored (SIGINT) == 0) { old_sigint = (SigHandler *)set_signal_handler (SIGINT, sigint_sighandler); interrupt_immediately++; } terminate_immediately = 1; current_readline_line = readline (current_readline_prompt ? current_readline_prompt : ""); terminate_immediately = 0; if (signal_is_ignored (SIGINT) == 0 && old_sigint) { interrupt_immediately--; set_signal_handler (SIGINT, old_sigint); } #if 0 /* Reset the prompt to the decoded value of prompt_string_pointer. */ reset_readline_prompt (); #endif if (current_readline_line == 0) return (EOF); current_readline_line_index = 0; line_len = strlen (current_readline_line); current_readline_line = (char *)xrealloc (current_readline_line, 2 + line_len); current_readline_line[line_len++] = '\n'; current_readline_line[line_len] = '\0'; } if (current_readline_line[current_readline_line_index] == 0) { free (current_readline_line); current_readline_line = (char *)NULL; return (yy_readline_get ()); } else { c = current_readline_line[current_readline_line_index++]; return (c); } } static int yy_readline_unget (c) int c; { if (current_readline_line_index && current_readline_line) current_readline_line[--current_readline_line_index] = c; return (c); } void with_input_from_stdin () { INPUT_STREAM location; if (bash_input.type != st_stdin && stream_on_stack (st_stdin) == 0) { location.string = current_readline_line; init_yy_io (yy_readline_get, yy_readline_unget, st_stdin, "readline stdin", location); } } #else /* !READLINE */ void with_input_from_stdin () { with_input_from_stream (stdin, "stdin"); } #endif /* !READLINE */ /* **************************************************************** */ /* */ /* Let input come from STRING. STRING is zero terminated. */ /* */ /* **************************************************************** */ static int yy_string_get () { register char *string; register unsigned char c; string = bash_input.location.string; /* If the string doesn't exist, or is empty, EOF found. */ if (string && *string) { c = *string++; bash_input.location.string = string; return (c); } else return (EOF); } static int yy_string_unget (c) int c; { *(--bash_input.location.string) = c; return (c); } void with_input_from_string (string, name) char *string; const char *name; { INPUT_STREAM location; location.string = string; init_yy_io (yy_string_get, yy_string_unget, st_string, name, location); } /* Count the number of characters we've consumed from bash_input.location.string and read into shell_input_line, but have not returned from shell_getc. That is the true input location. Rewind bash_input.location.string by that number of characters, so it points to the last character actually consumed by the parser. */ static void rewind_input_string () { int xchars; /* number of unconsumed characters in the input -- XXX need to take newlines into account, e.g., $(...\n) */ xchars = shell_input_line_len - shell_input_line_index; if (bash_input.location.string[-1] == '\n') xchars++; /* XXX - how to reflect bash_input.location.string back to string passed to parse_and_execute or xparse_dolparen? xparse_dolparen needs to know how far into the string we parsed. parse_and_execute knows where bash_input. location.string is, and how far from orig_string that is -- that's the number of characters the command consumed. */ /* bash_input.location.string - xchars should be where we parsed to */ /* need to do more validation on xchars value for sanity -- test cases. */ bash_input.location.string -= xchars; } /* **************************************************************** */ /* */ /* Let input come from STREAM. */ /* */ /* **************************************************************** */ /* These two functions used to test the value of the HAVE_RESTARTABLE_SYSCALLS define, and just use getc/ungetc if it was defined, but since bash installs its signal handlers without the SA_RESTART flag, some signals (like SIGCHLD, SIGWINCH, etc.) received during a read(2) will not cause the read to be restarted. We need to restart it ourselves. */ static int yy_stream_get () { int result; result = EOF; if (bash_input.location.file) { if (interactive) { interrupt_immediately++; terminate_immediately++; } result = getc_with_restart (bash_input.location.file); if (interactive) { interrupt_immediately--; terminate_immediately--; } } return (result); } static int yy_stream_unget (c) int c; { return (ungetc_with_restart (c, bash_input.location.file)); } void with_input_from_stream (stream, name) FILE *stream; const char *name; { INPUT_STREAM location; location.file = stream; init_yy_io (yy_stream_get, yy_stream_unget, st_stream, name, location); } typedef struct stream_saver { struct stream_saver *next; BASH_INPUT bash_input; int line; #if defined (BUFFERED_INPUT) BUFFERED_STREAM *bstream; #endif /* BUFFERED_INPUT */ } STREAM_SAVER; /* The globally known line number. */ int line_number = 0; #if defined (COND_COMMAND) static int cond_lineno; static int cond_token; #endif STREAM_SAVER *stream_list = (STREAM_SAVER *)NULL; void push_stream (reset_lineno) int reset_lineno; { STREAM_SAVER *saver = (STREAM_SAVER *)xmalloc (sizeof (STREAM_SAVER)); xbcopy ((char *)&bash_input, (char *)&(saver->bash_input), sizeof (BASH_INPUT)); #if defined (BUFFERED_INPUT) saver->bstream = (BUFFERED_STREAM *)NULL; /* If we have a buffered stream, clear out buffers[fd]. */ if (bash_input.type == st_bstream && bash_input.location.buffered_fd >= 0) saver->bstream = set_buffered_stream (bash_input.location.buffered_fd, (BUFFERED_STREAM *)NULL); #endif /* BUFFERED_INPUT */ saver->line = line_number; bash_input.name = (char *)NULL; saver->next = stream_list; stream_list = saver; EOF_Reached = 0; if (reset_lineno) line_number = 0; } void pop_stream () { if (!stream_list) EOF_Reached = 1; else { STREAM_SAVER *saver = stream_list; EOF_Reached = 0; stream_list = stream_list->next; init_yy_io (saver->bash_input.getter, saver->bash_input.ungetter, saver->bash_input.type, saver->bash_input.name, saver->bash_input.location); #if defined (BUFFERED_INPUT) /* If we have a buffered stream, restore buffers[fd]. */ /* If the input file descriptor was changed while this was on the save stack, update the buffered fd to the new file descriptor and re-establish the buffer <-> bash_input fd correspondence. */ if (bash_input.type == st_bstream && bash_input.location.buffered_fd >= 0) { if (bash_input_fd_changed) { bash_input_fd_changed = 0; if (default_buffered_input >= 0) { bash_input.location.buffered_fd = default_buffered_input; saver->bstream->b_fd = default_buffered_input; SET_CLOSE_ON_EXEC (default_buffered_input); } } /* XXX could free buffered stream returned as result here. */ set_buffered_stream (bash_input.location.buffered_fd, saver->bstream); } #endif /* BUFFERED_INPUT */ line_number = saver->line; FREE (saver->bash_input.name); free (saver); } } /* Return 1 if a stream of type TYPE is saved on the stack. */ int stream_on_stack (type) enum stream_type type; { register STREAM_SAVER *s; for (s = stream_list; s; s = s->next) if (s->bash_input.type == type) return 1; return 0; } /* Save the current token state and return it in a malloced array. */ int * save_token_state () { int *ret; ret = (int *)xmalloc (4 * sizeof (int)); ret[0] = last_read_token; ret[1] = token_before_that; ret[2] = two_tokens_ago; ret[3] = current_token; return ret; } void restore_token_state (ts) int *ts; { if (ts == 0) return; last_read_token = ts[0]; token_before_that = ts[1]; two_tokens_ago = ts[2]; current_token = ts[3]; } /* * This is used to inhibit alias expansion and reserved word recognition * inside case statement pattern lists. A `case statement pattern list' is: * * everything between the `in' in a `case word in' and the next ')' * or `esac' * everything between a `;;' and the next `)' or `esac' */ #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) #define END_OF_ALIAS 0 /* * Pseudo-global variables used in implementing token-wise alias expansion. */ /* * Pushing and popping strings. This works together with shell_getc to * implement alias expansion on a per-token basis. */ typedef struct string_saver { struct string_saver *next; int expand_alias; /* Value to set expand_alias to when string is popped. */ char *saved_line; #if defined (ALIAS) alias_t *expander; /* alias that caused this line to be pushed. */ #endif int saved_line_size, saved_line_index, saved_line_terminator; } STRING_SAVER; STRING_SAVER *pushed_string_list = (STRING_SAVER *)NULL; /* * Push the current shell_input_line onto a stack of such lines and make S * the current input. Used when expanding aliases. EXPAND is used to set * the value of expand_next_token when the string is popped, so that the * word after the alias in the original line is handled correctly when the * alias expands to multiple words. TOKEN is the token that was expanded * into S; it is saved and used to prevent infinite recursive expansion. */ static void push_string (s, expand, ap) char *s; int expand; alias_t *ap; { STRING_SAVER *temp = (STRING_SAVER *)xmalloc (sizeof (STRING_SAVER)); temp->expand_alias = expand; temp->saved_line = shell_input_line; temp->saved_line_size = shell_input_line_size; temp->saved_line_index = shell_input_line_index; temp->saved_line_terminator = shell_input_line_terminator; #if defined (ALIAS) temp->expander = ap; #endif temp->next = pushed_string_list; pushed_string_list = temp; #if defined (ALIAS) if (ap) ap->flags |= AL_BEINGEXPANDED; #endif shell_input_line = s; shell_input_line_size = strlen (s); shell_input_line_index = 0; shell_input_line_terminator = '\0'; #if 0 parser_state &= ~PST_ALEXPNEXT; /* XXX */ #endif set_line_mbstate (); } /* * Make the top of the pushed_string stack be the current shell input. * Only called when there is something on the stack. Called from shell_getc * when it thinks it has consumed the string generated by an alias expansion * and needs to return to the original input line. */ static void pop_string () { STRING_SAVER *t; FREE (shell_input_line); shell_input_line = pushed_string_list->saved_line; shell_input_line_index = pushed_string_list->saved_line_index; shell_input_line_size = pushed_string_list->saved_line_size; shell_input_line_terminator = pushed_string_list->saved_line_terminator; if (pushed_string_list->expand_alias) parser_state |= PST_ALEXPNEXT; else parser_state &= ~PST_ALEXPNEXT; t = pushed_string_list; pushed_string_list = pushed_string_list->next; #if defined (ALIAS) if (t->expander) t->expander->flags &= ~AL_BEINGEXPANDED; #endif free ((char *)t); set_line_mbstate (); } static void free_string_list () { register STRING_SAVER *t, *t1; for (t = pushed_string_list; t; ) { t1 = t->next; FREE (t->saved_line); #if defined (ALIAS) if (t->expander) t->expander->flags &= ~AL_BEINGEXPANDED; #endif free ((char *)t); t = t1; } pushed_string_list = (STRING_SAVER *)NULL; } #endif /* ALIAS || DPAREN_ARITHMETIC */ void free_pushed_string_input () { #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) free_string_list (); #endif } /* Return a line of text, taken from wherever yylex () reads input. If there is no more input, then we return NULL. If REMOVE_QUOTED_NEWLINE is non-zero, we remove unquoted \ pairs. This is used by read_secondary_line to read here documents. */ static char * read_a_line (remove_quoted_newline) int remove_quoted_newline; { static char *line_buffer = (char *)NULL; static int buffer_size = 0; int indx, c, peekc, pass_next; #if defined (READLINE) if (no_line_editing && SHOULD_PROMPT ()) #else if (SHOULD_PROMPT ()) #endif print_prompt (); pass_next = indx = 0; while (1) { /* Allow immediate exit if interrupted during input. */ QUIT; c = yy_getc (); /* Ignore null bytes in input. */ if (c == 0) { #if 0 internal_warning ("read_a_line: ignored null byte in input"); #endif continue; } /* If there is no more input, then we return NULL. */ if (c == EOF) { if (interactive && bash_input.type == st_stream) clearerr (stdin); if (indx == 0) return ((char *)NULL); c = '\n'; } /* `+2' in case the final character in the buffer is a newline. */ RESIZE_MALLOCED_BUFFER (line_buffer, indx, 2, buffer_size, 128); /* IF REMOVE_QUOTED_NEWLINES is non-zero, we are reading a here document with an unquoted delimiter. In this case, the line will be expanded as if it were in double quotes. We allow a backslash to escape the next character, but we need to treat the backslash specially only if a backslash quoting a backslash-newline pair appears in the line. */ if (pass_next) { line_buffer[indx++] = c; pass_next = 0; } else if (c == '\\' && remove_quoted_newline) { peekc = yy_getc (); if (peekc == '\n') { line_number++; continue; /* Make the unquoted \ pair disappear. */ } else { yy_ungetc (peekc); pass_next = 1; line_buffer[indx++] = c; /* Preserve the backslash. */ } } else line_buffer[indx++] = c; if (c == '\n') { line_buffer[indx] = '\0'; return (line_buffer); } } } /* Return a line as in read_a_line (), but insure that the prompt is the secondary prompt. This is used to read the lines of a here document. REMOVE_QUOTED_NEWLINE is non-zero if we should remove newlines quoted with backslashes while reading the line. It is non-zero unless the delimiter of the here document was quoted. */ char * read_secondary_line (remove_quoted_newline) int remove_quoted_newline; { char *ret; int n, c; prompt_string_pointer = &ps2_prompt; if (SHOULD_PROMPT()) prompt_again (); ret = read_a_line (remove_quoted_newline); #if defined (HISTORY) if (ret && remember_on_history && (parser_state & PST_HEREDOC)) { /* To make adding the the here-document body right, we need to rely on history_delimiting_chars() returning \n for the first line of the here-document body and the null string for the second and subsequent lines, so we avoid double newlines. current_command_line_count == 2 for the first line of the body. */ current_command_line_count++; maybe_add_history (ret); } #endif /* HISTORY */ return ret; } /* **************************************************************** */ /* */ /* YYLEX () */ /* */ /* **************************************************************** */ /* Reserved words. These are only recognized as the first word of a command. */ STRING_INT_ALIST word_token_alist[] = { { "if", IF }, { "then", THEN }, { "else", ELSE }, { "elif", ELIF }, { "fi", FI }, { "case", CASE }, { "esac", ESAC }, { "for", FOR }, #if defined (SELECT_COMMAND) { "select", SELECT }, #endif { "while", WHILE }, { "until", UNTIL }, { "do", DO }, { "done", DONE }, { "in", IN }, { "function", FUNCTION }, #if defined (COMMAND_TIMING) { "time", TIME }, #endif { "{", '{' }, { "}", '}' }, { "!", BANG }, #if defined (COND_COMMAND) { "[[", COND_START }, { "]]", COND_END }, #endif #if defined (COPROCESS_SUPPORT) { "coproc", COPROC }, #endif { (char *)NULL, 0} }; /* other tokens that can be returned by read_token() */ STRING_INT_ALIST other_token_alist[] = { /* Multiple-character tokens with special values */ { "-p", TIMEOPT }, { "&&", AND_AND }, { "||", OR_OR }, { ">>", GREATER_GREATER }, { "<<", LESS_LESS }, { "<&", LESS_AND }, { ">&", GREATER_AND }, { ";;", SEMI_SEMI }, { ";&", SEMI_AND }, { ";;&", SEMI_SEMI_AND }, { "<<-", LESS_LESS_MINUS }, { "<<<", LESS_LESS_LESS }, { "&>", AND_GREATER }, { "&>>", AND_GREATER_GREATER }, { "<>", LESS_GREATER }, { ">|", GREATER_BAR }, { "|&", BAR_AND }, { "EOF", yacc_EOF }, /* Tokens whose value is the character itself */ { ">", '>' }, { "<", '<' }, { "-", '-' }, { "{", '{' }, { "}", '}' }, { ";", ';' }, { "(", '(' }, { ")", ')' }, { "|", '|' }, { "&", '&' }, { "newline", '\n' }, { (char *)NULL, 0} }; /* others not listed here: WORD look at yylval.word ASSIGNMENT_WORD look at yylval.word NUMBER look at yylval.number ARITH_CMD look at yylval.word_list ARITH_FOR_EXPRS look at yylval.word_list COND_CMD look at yylval.command */ /* These are used by read_token_word, but appear up here so that shell_getc can use them to decide when to add otherwise blank lines to the history. */ /* The primary delimiter stack. */ struct dstack dstack = { (char *)NULL, 0, 0 }; /* A temporary delimiter stack to be used when decoding prompt strings. This is needed because command substitutions in prompt strings (e.g., PS2) can screw up the parser's quoting state. */ static struct dstack temp_dstack = { (char *)NULL, 0, 0 }; /* Macro for accessing the top delimiter on the stack. Returns the delimiter or zero if none. */ #define current_delimiter(ds) \ (ds.delimiter_depth ? ds.delimiters[ds.delimiter_depth - 1] : 0) #define push_delimiter(ds, character) \ do \ { \ if (ds.delimiter_depth + 2 > ds.delimiter_space) \ ds.delimiters = (char *)xrealloc \ (ds.delimiters, (ds.delimiter_space += 10) * sizeof (char)); \ ds.delimiters[ds.delimiter_depth] = character; \ ds.delimiter_depth++; \ } \ while (0) #define pop_delimiter(ds) ds.delimiter_depth-- /* Return the next shell input character. This always reads characters from shell_input_line; when that line is exhausted, it is time to read the next line. This is called by read_token when the shell is processing normal command input. */ /* This implements one-character lookahead/lookbehind across physical input lines, to avoid something being lost because it's pushed back with shell_ungetc when we're at the start of a line. */ static int eol_ungetc_lookahead = 0; static int shell_getc (remove_quoted_newline) int remove_quoted_newline; { register int i; int c; unsigned char uc; char *history_buf = NULL; int history_index = 0; int history_start = 0; QUIT; if (sigwinch_received) { sigwinch_received = 0; get_new_window_size (0, (int *)0, (int *)0); } if (eol_ungetc_lookahead) { c = eol_ungetc_lookahead; eol_ungetc_lookahead = 0; return (c); } #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) /* If shell_input_line[shell_input_line_index] == 0, but there is something on the pushed list of strings, then we don't want to go off and get another line. We let the code down below handle it. */ if (!shell_input_line || ((!shell_input_line[shell_input_line_index]) && (pushed_string_list == (STRING_SAVER *)NULL))) #else /* !ALIAS && !DPAREN_ARITHMETIC */ if (!shell_input_line || !shell_input_line[shell_input_line_index]) #endif /* !ALIAS && !DPAREN_ARITHMETIC */ { line_number++; restart_read: /* Allow immediate exit if interrupted during input. */ QUIT; i = 0; shell_input_line_terminator = 0; /* If the shell is interatctive, but not currently printing a prompt (interactive_shell && interactive == 0), we don't want to print notifies or cleanup the jobs -- we want to defer it until we do print the next prompt. */ if (interactive_shell == 0 || SHOULD_PROMPT()) { #if defined (JOB_CONTROL) /* This can cause a problem when reading a command as the result of a trap, when the trap is called from flush_child. This call had better not cause jobs to disappear from the job table in that case, or we will have big trouble. */ notify_and_cleanup (); #else /* !JOB_CONTROL */ cleanup_dead_jobs (); #endif /* !JOB_CONTROL */ } #if defined (READLINE) if (no_line_editing && SHOULD_PROMPT()) #else if (SHOULD_PROMPT()) #endif print_prompt (); if (bash_input.type == st_stream) clearerr (stdin); int no_escape = 0; while (1) { c = yy_getc (); /* Allow immediate exit if interrupted during input. */ QUIT; if (c == '\0') { #if 0 internal_warning ("shell_getc: ignored null byte in input"); #endif continue; } RESIZE_MALLOCED_BUFFER (shell_input_line, i, 2, shell_input_line_size, 256); if (c == EOF) { if (bash_input.type == st_stream) clearerr (stdin); if (i == 0) shell_input_line_terminator = EOF; shell_input_line[i] = '\0'; break; } //need to fix terminating special character ';' //vyatta if (interactive && shell_input_line) { char *string = shell_input_line; while (*string && (whitespace (*string) || *string == '\n')) string++; int pos = string - shell_input_line; //find where string starts (skipping whitespace) if (strncmp(&shell_input_line[pos],"set ",4) == 0 || strncmp(&shell_input_line[pos],"delete ",7) == 0) { if (c == '"' || c == '\'') { //this suppresses a quoted string if (no_escape == 1) { no_escape = 0; } else { no_escape = 1; } } else if ((c == ';' || c == '&' || c == '(' || c == ')' || c == '>' || c == '<' || c == '|' || c == '`') && shell_input_line[i-1] != '\\') { if (no_escape == 0) { shell_input_line[i++] = '\\'; history_buf = realloc(history_buf,i+1); register int j; for (j = history_start; j < i-1; ++j) { history_buf[history_index++] = shell_input_line[j]; } history_start = i; } } } } shell_input_line[i++] = c; if (c == '\n') { shell_input_line[--i] = '\0'; current_command_line_count++; break; } } shell_input_line_index = 0; shell_input_line_len = i; /* == strlen (shell_input_line) */ set_line_mbstate (); #if defined (HISTORY) if (remember_on_history && shell_input_line && shell_input_line[0]) { char *expansions; # if defined (BANG_HISTORY) int old_hist; /* If the current delimiter is a single quote, we should not be performing history expansion, even if we're on a different line from the original single quote. */ old_hist = history_expansion_inhibited; if (current_delimiter (dstack) == '\'') history_expansion_inhibited = 1; # endif //vyatta int flag = 0; if (history_index > 0) { history_buf = realloc(history_buf,i+1); register int j; for (j = history_start; j < i; ++j) { history_buf[history_index++] = shell_input_line[j]; } history_buf[history_index] = '\0'; expansions = pre_process_line (history_buf, 1, 1); flag = expansions != history_buf; free(history_buf); } else { expansions = pre_process_line (shell_input_line, 1, 1); flag = expansions != shell_input_line; } # if defined (BANG_HISTORY) history_expansion_inhibited = old_hist; # endif if (flag) { free (shell_input_line); shell_input_line = expansions; shell_input_line_len = shell_input_line ? strlen (shell_input_line) : 0; if (!shell_input_line_len) current_command_line_count--; /* We have to force the xrealloc below because we don't know the true allocated size of shell_input_line anymore. */ shell_input_line_size = shell_input_line_len; set_line_mbstate (); } } /* Try to do something intelligent with blank lines encountered while entering multi-line commands. XXX - this is grotesque */ else if (remember_on_history && shell_input_line && shell_input_line[0] == '\0' && current_command_line_count > 1) { if (current_delimiter (dstack)) /* We know shell_input_line[0] == 0 and we're reading some sort of quoted string. This means we've got a line consisting of only a newline in a quoted string. We want to make sure this line gets added to the history. */ maybe_add_history (shell_input_line); else { char *hdcs; hdcs = history_delimiting_chars (); if (hdcs && hdcs[0] == ';') maybe_add_history (shell_input_line); } } #endif /* HISTORY */ if (shell_input_line) { /* Lines that signify the end of the shell's input should not be echoed. */ if (echo_input_at_read && (shell_input_line[0] || shell_input_line_terminator != EOF)) fprintf (stderr, "%s\n", shell_input_line); } else { shell_input_line_size = 0; prompt_string_pointer = ¤t_prompt_string; if (SHOULD_PROMPT ()) prompt_again (); goto restart_read; } /* Add the newline to the end of this string, iff the string does not already end in an EOF character. */ if (shell_input_line_terminator != EOF) { if (shell_input_line_len + 3 > shell_input_line_size) shell_input_line = (char *)xrealloc (shell_input_line, 1 + (shell_input_line_size += 2)); shell_input_line[shell_input_line_len] = '\n'; shell_input_line[shell_input_line_len + 1] = '\0'; set_line_mbstate (); } } uc = shell_input_line[shell_input_line_index]; if (uc) shell_input_line_index++; #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) /* If UC is NULL, we have reached the end of the current input string. If pushed_string_list is non-empty, it's time to pop to the previous string because we have fully consumed the result of the last alias expansion. Do it transparently; just return the next character of the string popped to. */ pop_alias: if (!uc && (pushed_string_list != (STRING_SAVER *)NULL)) { pop_string (); uc = shell_input_line[shell_input_line_index]; if (uc) shell_input_line_index++; } #endif /* ALIAS || DPAREN_ARITHMETIC */ if MBTEST(uc == '\\' && remove_quoted_newline && shell_input_line[shell_input_line_index] == '\n') { if (SHOULD_PROMPT ()) prompt_again (); line_number++; /* XXX - what do we do here if we're expanding an alias whose definition ends with a newline? Recall that we inhibit the appending of a space in mk_alexpansion() if newline is the last character. */ #if 0 /* XXX - bash-4.2 (jonathan@claggett.org) */ if (expanding_alias () && shell_input_line[shell_input_line_index+1] == '\0') { uc = 0; goto pop_alias; } #endif goto restart_read; } if (!uc && shell_input_line_terminator == EOF) return ((shell_input_line_index != 0) ? '\n' : EOF); return (uc); } /* Put C back into the input for the shell. This might need changes for HANDLE_MULTIBYTE around EOLs. Since we (currently) never push back a character different than we read, shell_input_line_property doesn't need to change when manipulating shell_input_line. The define for last_shell_getc_is_singlebyte should take care of it, though. */ static void shell_ungetc (c) int c; { if (shell_input_line && shell_input_line_index) shell_input_line[--shell_input_line_index] = c; else eol_ungetc_lookahead = c; } #ifdef INCLUDE_UNUSED /* Back the input pointer up by one, effectively `ungetting' a character. */ static void shell_ungetchar () { if (shell_input_line && shell_input_line_index) shell_input_line_index--; } #endif /* Discard input until CHARACTER is seen, then push that character back onto the input stream. */ static void discard_until (character) int character; { int c; while ((c = shell_getc (0)) != EOF && c != character) ; if (c != EOF) shell_ungetc (c); } void execute_variable_command (command, vname) char *command, *vname; { char *last_lastarg; sh_parser_state_t ps; save_parser_state (&ps); last_lastarg = get_string_value ("_"); if (last_lastarg) last_lastarg = savestring (last_lastarg); parse_and_execute (savestring (command), vname, SEVAL_NONINT|SEVAL_NOHIST); restore_parser_state (&ps); bind_variable ("_", last_lastarg, 0); FREE (last_lastarg); if (token_to_read == '\n') /* reset_parser was called */ token_to_read = 0; } /* Place to remember the token. We try to keep the buffer at a reasonable size, but it can grow. */ static char *token = (char *)NULL; /* Current size of the token buffer. */ static int token_buffer_size; /* Command to read_token () explaining what we want it to do. */ #define READ 0 #define RESET 1 #define prompt_is_ps1 \ (!prompt_string_pointer || prompt_string_pointer == &ps1_prompt) /* Function for yyparse to call. yylex keeps track of the last two tokens read, and calls read_token. */ static int yylex () { if (interactive && (current_token == 0 || current_token == '\n')) { /* Before we print a prompt, we might have to check mailboxes. We do this only if it is time to do so. Notice that only here is the mail alarm reset; nothing takes place in check_mail () except the checking of mail. Please don't change this. */ if (prompt_is_ps1 && time_to_check_mail ()) { check_mail (); reset_mail_timer (); } /* Avoid printing a prompt if we're not going to read anything, e.g. after resetting the parser with read_token (RESET). */ if (token_to_read == 0 && SHOULD_PROMPT ()) prompt_again (); } two_tokens_ago = token_before_that; token_before_that = last_read_token; last_read_token = current_token; current_token = read_token (READ); if ((parser_state & PST_EOFTOKEN) && current_token == shell_eof_token) { current_token = yacc_EOF; if (bash_input.type == st_string) rewind_input_string (); } parser_state &= ~PST_EOFTOKEN; return (current_token); } /* When non-zero, we have read the required tokens which allow ESAC to be the next one read. */ static int esacs_needed_count; void gather_here_documents () { int r; r = 0; while (need_here_doc) { parser_state |= PST_HEREDOC; make_here_document (redir_stack[r++], line_number); parser_state &= ~PST_HEREDOC; need_here_doc--; } } /* When non-zero, an open-brace used to create a group is awaiting a close brace partner. */ static int open_brace_count; #define command_token_position(token) \ (((token) == ASSIGNMENT_WORD) || (parser_state&PST_REDIRLIST) || \ ((token) != SEMI_SEMI && (token) != SEMI_AND && (token) != SEMI_SEMI_AND && reserved_word_acceptable(token))) #define assignment_acceptable(token) \ (command_token_position(token) && ((parser_state & PST_CASEPAT) == 0)) /* Check to see if TOKEN is a reserved word and return the token value if it is. */ #define CHECK_FOR_RESERVED_WORD(tok) \ do { \ if (!dollar_present && !quoted && \ reserved_word_acceptable (last_read_token)) \ { \ int i; \ for (i = 0; word_token_alist[i].word != (char *)NULL; i++) \ if (STREQ (tok, word_token_alist[i].word)) \ { \ if ((parser_state & PST_CASEPAT) && (word_token_alist[i].token != ESAC)) \ break; \ if (word_token_alist[i].token == TIME && time_command_acceptable () == 0) \ break; \ if (word_token_alist[i].token == ESAC) \ parser_state &= ~(PST_CASEPAT|PST_CASESTMT); \ else if (word_token_alist[i].token == CASE) \ parser_state |= PST_CASESTMT; \ else if (word_token_alist[i].token == COND_END) \ parser_state &= ~(PST_CONDCMD|PST_CONDEXPR); \ else if (word_token_alist[i].token == COND_START) \ parser_state |= PST_CONDCMD; \ else if (word_token_alist[i].token == '{') \ open_brace_count++; \ else if (word_token_alist[i].token == '}' && open_brace_count) \ open_brace_count--; \ return (word_token_alist[i].token); \ } \ } \ } while (0) #if defined (ALIAS) /* OK, we have a token. Let's try to alias expand it, if (and only if) it's eligible. It is eligible for expansion if EXPAND_ALIASES is set, and the token is unquoted and the last token read was a command separator (or expand_next_token is set), and we are currently processing an alias (pushed_string_list is non-empty) and this token is not the same as the current or any previously processed alias. Special cases that disqualify: In a pattern list in a case statement (parser_state & PST_CASEPAT). */ static char * mk_alexpansion (s) char *s; { int l; char *r; l = strlen (s); r = xmalloc (l + 2); strcpy (r, s); #if 0 /* XXX - bash-4.2 */ if (r[l -1] != ' ' && r[l -1] != '\n') #else if (r[l -1] != ' ') #endif r[l++] = ' '; r[l] = '\0'; return r; } static int alias_expand_token (tokstr) char *tokstr; { char *expanded; alias_t *ap; if (((parser_state & PST_ALEXPNEXT) || command_token_position (last_read_token)) && (parser_state & PST_CASEPAT) == 0) { ap = find_alias (tokstr); /* Currently expanding this token. */ if (ap && (ap->flags & AL_BEINGEXPANDED)) return (NO_EXPANSION); /* mk_alexpansion puts an extra space on the end of the alias expansion, so the lookahead by the parser works right. If this gets changed, make sure the code in shell_getc that deals with reaching the end of an expanded alias is changed with it. */ expanded = ap ? mk_alexpansion (ap->value) : (char *)NULL; if (expanded) { push_string (expanded, ap->flags & AL_EXPANDNEXT, ap); return (RE_READ_TOKEN); } else /* This is an eligible token that does not have an expansion. */ return (NO_EXPANSION); } return (NO_EXPANSION); } #endif /* ALIAS */ static int time_command_acceptable () { #if defined (COMMAND_TIMING) switch (last_read_token) { case 0: case ';': case '\n': case AND_AND: case OR_OR: case '&': case DO: case THEN: case ELSE: case '{': /* } */ case '(': /* ) */ return 1; default: return 0; } #else return 0; #endif /* COMMAND_TIMING */ } /* Handle special cases of token recognition: IN is recognized if the last token was WORD and the token before that was FOR or CASE or SELECT. DO is recognized if the last token was WORD and the token before that was FOR or SELECT. ESAC is recognized if the last token caused `esacs_needed_count' to be set `{' is recognized if the last token as WORD and the token before that was FUNCTION, or if we just parsed an arithmetic `for' command. `}' is recognized if there is an unclosed `{' present. `-p' is returned as TIMEOPT if the last read token was TIME. ']]' is returned as COND_END if the parser is currently parsing a conditional expression ((parser_state & PST_CONDEXPR) != 0) `time' is returned as TIME if and only if it is immediately preceded by one of `;', `\n', `||', `&&', or `&'. */ static int special_case_tokens (tokstr) char *tokstr; { if ((last_read_token == WORD) && #if defined (SELECT_COMMAND) ((token_before_that == FOR) || (token_before_that == CASE) || (token_before_that == SELECT)) && #else ((token_before_that == FOR) || (token_before_that == CASE)) && #endif (tokstr[0] == 'i' && tokstr[1] == 'n' && tokstr[2] == 0)) { if (token_before_that == CASE) { parser_state |= PST_CASEPAT; esacs_needed_count++; } return (IN); } if (last_read_token == WORD && #if defined (SELECT_COMMAND) (token_before_that == FOR || token_before_that == SELECT) && #else (token_before_that == FOR) && #endif (tokstr[0] == 'd' && tokstr[1] == 'o' && tokstr[2] == '\0')) return (DO); /* Ditto for ESAC in the CASE case. Specifically, this handles "case word in esac", which is a legal construct, certainly because someone will pass an empty arg to the case construct, and we don't want it to barf. Of course, we should insist that the case construct has at least one pattern in it, but the designers disagree. */ if (esacs_needed_count) { esacs_needed_count--; if (STREQ (tokstr, "esac")) { parser_state &= ~PST_CASEPAT; return (ESAC); } } /* The start of a shell function definition. */ if (parser_state & PST_ALLOWOPNBRC) { parser_state &= ~PST_ALLOWOPNBRC; if (tokstr[0] == '{' && tokstr[1] == '\0') /* } */ { open_brace_count++; function_bstart = line_number; return ('{'); /* } */ } } /* We allow a `do' after a for ((...)) without an intervening list_terminator */ if (last_read_token == ARITH_FOR_EXPRS && tokstr[0] == 'd' && tokstr[1] == 'o' && !tokstr[2]) return (DO); if (last_read_token == ARITH_FOR_EXPRS && tokstr[0] == '{' && tokstr[1] == '\0') /* } */ { open_brace_count++; return ('{'); /* } */ } if (open_brace_count && reserved_word_acceptable (last_read_token) && tokstr[0] == '}' && !tokstr[1]) { open_brace_count--; /* { */ return ('}'); } #if defined (COMMAND_TIMING) /* Handle -p after `time'. */ if (last_read_token == TIME && tokstr[0] == '-' && tokstr[1] == 'p' && !tokstr[2]) return (TIMEOPT); #endif #if 0 #if defined (COMMAND_TIMING) if (STREQ (token, "time") && ((parser_state & PST_CASEPAT) == 0) && time_command_acceptable ()) return (TIME); #endif /* COMMAND_TIMING */ #endif #if defined (COND_COMMAND) /* [[ */ if ((parser_state & PST_CONDEXPR) && tokstr[0] == ']' && tokstr[1] == ']' && tokstr[2] == '\0') return (COND_END); #endif return (-1); } /* Called from shell.c when Control-C is typed at top level. Or by the error rule at top level. */ void reset_parser () { dstack.delimiter_depth = 0; /* No delimiters found so far. */ open_brace_count = 0; #if defined (EXTENDED_GLOB) /* Reset to global value of extended glob */ if (parser_state & PST_EXTPAT) extended_glob = global_extglob; #endif parser_state = 0; #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) if (pushed_string_list) free_string_list (); #endif /* ALIAS || DPAREN_ARITHMETIC */ if (shell_input_line) { free (shell_input_line); shell_input_line = (char *)NULL; shell_input_line_size = shell_input_line_index = 0; } FREE (word_desc_to_read); word_desc_to_read = (WORD_DESC *)NULL; current_token = '\n'; /* XXX */ last_read_token = '\n'; token_to_read = '\n'; } /* Read the next token. Command can be READ (normal operation) or RESET (to normalize state). */ static int read_token (command) int command; { int character; /* Current character. */ int peek_char; /* Temporary look-ahead character. */ int result; /* The thing to return. */ if (command == RESET) { reset_parser (); return ('\n'); } if (token_to_read) { result = token_to_read; if (token_to_read == WORD || token_to_read == ASSIGNMENT_WORD) { yylval.word = word_desc_to_read; word_desc_to_read = (WORD_DESC *)NULL; } token_to_read = 0; return (result); } #if defined (COND_COMMAND) if ((parser_state & (PST_CONDCMD|PST_CONDEXPR)) == PST_CONDCMD) { cond_lineno = line_number; parser_state |= PST_CONDEXPR; yylval.command = parse_cond_command (); if (cond_token != COND_END) { cond_error (); return (-1); } token_to_read = COND_END; parser_state &= ~(PST_CONDEXPR|PST_CONDCMD); return (COND_CMD); } #endif #if defined (ALIAS) /* This is a place to jump back to once we have successfully expanded a token with an alias and pushed the string with push_string () */ re_read_token: #endif /* ALIAS */ /* Read a single word from input. Start by skipping blanks. */ while ((character = shell_getc (1)) != EOF && shellblank (character)) ; if (character == EOF) { EOF_Reached = 1; return (yacc_EOF); } if MBTEST(character == '#' && (!interactive || interactive_comments)) { /* A comment. Discard until EOL or EOF, and then return a newline. */ discard_until ('\n'); shell_getc (0); character = '\n'; /* this will take the next if statement and return. */ } if (character == '\n') { /* If we're about to return an unquoted newline, we can go and collect the text of any pending here document. */ if (need_here_doc) gather_here_documents (); #if defined (ALIAS) parser_state &= ~PST_ALEXPNEXT; #endif /* ALIAS */ parser_state &= ~PST_ASSIGNOK; return (character); } if (parser_state & PST_REGEXP) goto tokword; /* Shell meta-characters. */ if MBTEST(shellmeta (character) && ((parser_state & PST_DBLPAREN) == 0)) { #if defined (ALIAS) /* Turn off alias tokenization iff this character sequence would not leave us ready to read a command. */ if (character == '<' || character == '>') parser_state &= ~PST_ALEXPNEXT; #endif /* ALIAS */ parser_state &= ~PST_ASSIGNOK; peek_char = shell_getc (1); if (character == peek_char) { switch (character) { case '<': /* If '<' then we could be at "<<" or at "<<-". We have to look ahead one more character. */ peek_char = shell_getc (1); if MBTEST(peek_char == '-') return (LESS_LESS_MINUS); else if MBTEST(peek_char == '<') return (LESS_LESS_LESS); else { shell_ungetc (peek_char); return (LESS_LESS); } case '>': return (GREATER_GREATER); case ';': parser_state |= PST_CASEPAT; #if defined (ALIAS) parser_state &= ~PST_ALEXPNEXT; #endif /* ALIAS */ peek_char = shell_getc (1); if MBTEST(peek_char == '&') return (SEMI_SEMI_AND); else { shell_ungetc (peek_char); return (SEMI_SEMI); } case '&': return (AND_AND); case '|': return (OR_OR); #if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND) case '(': /* ) */ result = parse_dparen (character); if (result == -2) break; else return result; #endif } } else if MBTEST(character == '<' && peek_char == '&') return (LESS_AND); else if MBTEST(character == '>' && peek_char == '&') return (GREATER_AND); else if MBTEST(character == '<' && peek_char == '>') return (LESS_GREATER); else if MBTEST(character == '>' && peek_char == '|') return (GREATER_BAR); else if MBTEST(character == '&' && peek_char == '>') { peek_char = shell_getc (1); if MBTEST(peek_char == '>') return (AND_GREATER_GREATER); else { shell_ungetc (peek_char); return (AND_GREATER); } } else if MBTEST(character == '|' && peek_char == '&') return (BAR_AND); else if MBTEST(character == ';' && peek_char == '&') { parser_state |= PST_CASEPAT; #if defined (ALIAS) parser_state &= ~PST_ALEXPNEXT; #endif /* ALIAS */ return (SEMI_AND); } shell_ungetc (peek_char); /* If we look like we are reading the start of a function definition, then let the reader know about it so that we will do the right thing with `{'. */ if MBTEST(character == ')' && last_read_token == '(' && token_before_that == WORD) { parser_state |= PST_ALLOWOPNBRC; #if defined (ALIAS) parser_state &= ~PST_ALEXPNEXT; #endif /* ALIAS */ function_dstart = line_number; } /* case pattern lists may be preceded by an optional left paren. If we're not trying to parse a case pattern list, the left paren indicates a subshell. */ if MBTEST(character == '(' && (parser_state & PST_CASEPAT) == 0) /* ) */ parser_state |= PST_SUBSHELL; /*(*/ else if MBTEST((parser_state & PST_CASEPAT) && character == ')') parser_state &= ~PST_CASEPAT; /*(*/ else if MBTEST((parser_state & PST_SUBSHELL) && character == ')') parser_state &= ~PST_SUBSHELL; #if defined (PROCESS_SUBSTITUTION) /* Check for the constructs which introduce process substitution. Shells running in `posix mode' don't do process substitution. */ if MBTEST(posixly_correct || ((character != '>' && character != '<') || peek_char != '(')) /*)*/ #endif /* PROCESS_SUBSTITUTION */ return (character); } /* Hack <&- (close stdin) case. Also <&N- (dup and close). */ if MBTEST(character == '-' && (last_read_token == LESS_AND || last_read_token == GREATER_AND)) return (character); tokword: /* Okay, if we got this far, we have to read a word. Read one, and then check it against the known ones. */ result = read_token_word (character); #if defined (ALIAS) if (result == RE_READ_TOKEN) goto re_read_token; #endif return result; } /* * Match a $(...) or other grouping construct. This has to handle embedded * quoted strings ('', ``, "") and nested constructs. It also must handle * reprompting the user, if necessary, after reading a newline, and returning * correct error values if it reads EOF. */ #define P_FIRSTCLOSE 0x01 #define P_ALLOWESC 0x02 #define P_DQUOTE 0x04 #define P_COMMAND 0x08 /* parsing a command, so look for comments */ #define P_BACKQUOTE 0x10 /* parsing a backquoted command substitution */ #define P_ARRAYSUB 0x20 /* parsing a [...] array subscript for assignment */ /* Lexical state while parsing a grouping construct or $(...). */ #define LEX_WASDOL 0x001 #define LEX_CKCOMMENT 0x002 #define LEX_INCOMMENT 0x004 #define LEX_PASSNEXT 0x008 #define LEX_RESWDOK 0x010 #define LEX_CKCASE 0x020 #define LEX_INCASE 0x040 #define LEX_INHEREDOC 0x080 #define LEX_HEREDELIM 0x100 /* reading here-doc delimiter */ #define LEX_STRIPDOC 0x200 /* <<- strip tabs from here doc delim */ #define LEX_INWORD 0x400 #define COMSUB_META(ch) ((ch) == ';' || (ch) == '&' || (ch) == '|') #define CHECK_NESTRET_ERROR() \ do { \ if (nestret == &matched_pair_error) \ { \ free (ret); \ return &matched_pair_error; \ } \ } while (0) #define APPEND_NESTRET() \ do { \ if (nestlen) \ { \ RESIZE_MALLOCED_BUFFER (ret, retind, nestlen, retsize, 64); \ strcpy (ret + retind, nestret); \ retind += nestlen; \ } \ } while (0) static char matched_pair_error; static char * parse_matched_pair (qc, open, close, lenp, flags) int qc; /* `"' if this construct is within double quotes */ int open, close; int *lenp, flags; { int count, ch, tflags; int nestlen, ttranslen, start_lineno; char *ret, *nestret, *ttrans; int retind, retsize, rflags; /*itrace("parse_matched_pair[%d]: open = %c close = %c flags = %d", line_number, open, close, flags);*/ count = 1; tflags = 0; if ((flags & P_COMMAND) && qc != '`' && qc != '\'' && qc != '"' && (flags & P_DQUOTE) == 0) tflags |= LEX_CKCOMMENT; /* RFLAGS is the set of flags we want to pass to recursive calls. */ rflags = (qc == '"') ? P_DQUOTE : (flags & P_DQUOTE); ret = (char *)xmalloc (retsize = 64); retind = 0; start_lineno = line_number; while (count) { ch = shell_getc (qc != '\'' && (tflags & LEX_PASSNEXT) == 0); if (ch == EOF) { free (ret); parser_error (start_lineno, _("unexpected EOF while looking for matching `%c'"), close); EOF_Reached = 1; /* XXX */ return (&matched_pair_error); } /* Possible reprompting. */ if (ch == '\n' && SHOULD_PROMPT ()) prompt_again (); /* Don't bother counting parens or doing anything else if in a comment or part of a case statement */ if (tflags & LEX_INCOMMENT) { /* Add this character. */ RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = ch; if (ch == '\n') tflags &= ~LEX_INCOMMENT; continue; } /* Not exactly right yet, should handle shell metacharacters, too. If any changes are made to this test, make analogous changes to subst.c: extract_delimited_string(). */ else if MBTEST((tflags & LEX_CKCOMMENT) && (tflags & LEX_INCOMMENT) == 0 && ch == '#' && (retind == 0 || ret[retind-1] == '\n' || shellblank (ret[retind - 1]))) tflags |= LEX_INCOMMENT; if (tflags & LEX_PASSNEXT) /* last char was backslash */ { tflags &= ~LEX_PASSNEXT; if (qc != '\'' && ch == '\n') /* double-quoted \ disappears. */ { if (retind > 0) retind--; /* swallow previously-added backslash */ continue; } RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64); if MBTEST(ch == CTLESC || ch == CTLNUL) ret[retind++] = CTLESC; ret[retind++] = ch; continue; } /* If we're reparsing the input (e.g., from parse_string_to_word_list), we've already prepended CTLESC to single-quoted results of $'...'. We may want to do this for other CTLESC-quoted characters in reparse, too. */ else if MBTEST((parser_state & PST_REPARSE) && open == '\'' && (ch == CTLESC || ch == CTLNUL)) { RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = ch; continue; } else if MBTEST(ch == CTLESC || ch == CTLNUL) /* special shell escapes */ { RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64); ret[retind++] = CTLESC; ret[retind++] = ch; continue; } else if MBTEST(ch == close) /* ending delimiter */ count--; /* handle nested ${...} specially. */ else if MBTEST(open != close && (tflags & LEX_WASDOL) && open == '{' && ch == open) /* } */ count++; else if MBTEST(((flags & P_FIRSTCLOSE) == 0) && ch == open) /* nested begin */ count++; /* Add this character. */ RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = ch; /* If we just read the ending character, don't bother continuing. */ if (count == 0) break; if (open == '\'') /* '' inside grouping construct */ { if MBTEST((flags & P_ALLOWESC) && ch == '\\') tflags |= LEX_PASSNEXT; continue; } if MBTEST(ch == '\\') /* backslashes */ tflags |= LEX_PASSNEXT; #if 0 /* The big hammer. Single quotes aren't special in double quotes. The problem is that Posix says the single quotes are semi-special: within a double-quoted ${...} construct "an even number of unescaped double-quotes or single-quotes, if any, shall occur." */ if MBTEST(open == '{' && (flags & P_DQUOTE) && ch == '\'') /* } */ continue; #endif /* Could also check open == '`' if we want to parse grouping constructs inside old-style command substitution. */ if (open != close) /* a grouping construct */ { if MBTEST(shellquote (ch)) { /* '', ``, or "" inside $(...) or other grouping construct. */ push_delimiter (dstack, ch); if MBTEST((tflags & LEX_WASDOL) && ch == '\'') /* $'...' inside group */ nestret = parse_matched_pair (ch, ch, ch, &nestlen, P_ALLOWESC|rflags); else nestret = parse_matched_pair (ch, ch, ch, &nestlen, rflags); pop_delimiter (dstack); CHECK_NESTRET_ERROR (); if MBTEST((tflags & LEX_WASDOL) && ch == '\'' && (extended_quote || (rflags & P_DQUOTE) == 0)) { /* Translate $'...' here. */ ttrans = ansiexpand (nestret, 0, nestlen - 1, &ttranslen); xfree (nestret); if ((rflags & P_DQUOTE) == 0) { nestret = sh_single_quote (ttrans); free (ttrans); nestlen = strlen (nestret); } else { nestret = ttrans; nestlen = ttranslen; } retind -= 2; /* back up before the $' */ } else if MBTEST((tflags & LEX_WASDOL) && ch == '"' && (extended_quote || (rflags & P_DQUOTE) == 0)) { /* Locale expand $"..." here. */ ttrans = localeexpand (nestret, 0, nestlen - 1, start_lineno, &ttranslen); xfree (nestret); nestret = sh_mkdoublequoted (ttrans, ttranslen, 0); free (ttrans); nestlen = ttranslen + 2; retind -= 2; /* back up before the $" */ } APPEND_NESTRET (); FREE (nestret); } else if ((flags & P_ARRAYSUB) && (tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */ goto parse_dollar_word; } /* Parse an old-style command substitution within double quotes as a single word. */ /* XXX - sh and ksh93 don't do this - XXX */ else if MBTEST(open == '"' && ch == '`') { nestret = parse_matched_pair (0, '`', '`', &nestlen, rflags); CHECK_NESTRET_ERROR (); APPEND_NESTRET (); FREE (nestret); } else if MBTEST(open != '`' && (tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */ /* check for $(), $[], or ${} inside quoted string. */ { parse_dollar_word: if (open == ch) /* undo previous increment */ count--; if (ch == '(') /* ) */ nestret = parse_comsub (0, '(', ')', &nestlen, (rflags|P_COMMAND) & ~P_DQUOTE); else if (ch == '{') /* } */ nestret = parse_matched_pair (0, '{', '}', &nestlen, P_FIRSTCLOSE|rflags); else if (ch == '[') /* ] */ nestret = parse_matched_pair (0, '[', ']', &nestlen, rflags); CHECK_NESTRET_ERROR (); APPEND_NESTRET (); FREE (nestret); } if MBTEST(ch == '$') tflags |= LEX_WASDOL; else tflags &= ~LEX_WASDOL; } ret[retind] = '\0'; if (lenp) *lenp = retind; /*itrace("parse_matched_pair[%d]: returning %s", line_number, ret);*/ return ret; } /* Parse a $(...) command substitution. This is messier than I'd like, and reproduces a lot more of the token-reading code than I'd like. */ static char * parse_comsub (qc, open, close, lenp, flags) int qc; /* `"' if this construct is within double quotes */ int open, close; int *lenp, flags; { int count, ch, peekc, tflags, lex_rwlen, lex_wlen, lex_firstind; int nestlen, ttranslen, start_lineno; char *ret, *nestret, *ttrans, *heredelim; int retind, retsize, rflags, hdlen; /*itrace("parse_comsub: qc = `%c' open = %c close = %c", qc, open, close);*/ count = 1; tflags = LEX_RESWDOK; if ((flags & P_COMMAND) && qc != '\'' && qc != '"' && (flags & P_DQUOTE) == 0) tflags |= LEX_CKCASE; if ((tflags & LEX_CKCASE) && (interactive == 0 || interactive_comments)) tflags |= LEX_CKCOMMENT; /* RFLAGS is the set of flags we want to pass to recursive calls. */ rflags = (flags & P_DQUOTE); ret = (char *)xmalloc (retsize = 64); retind = 0; start_lineno = line_number; lex_rwlen = lex_wlen = 0; heredelim = 0; lex_firstind = -1; while (count) { comsub_readchar: ch = shell_getc (qc != '\'' && (tflags & LEX_PASSNEXT) == 0); if (ch == EOF) { eof_error: free (ret); FREE (heredelim); parser_error (start_lineno, _("unexpected EOF while looking for matching `%c'"), close); EOF_Reached = 1; /* XXX */ return (&matched_pair_error); } /* If we hit the end of a line and are reading the contents of a here document, and it's not the same line that the document starts on, check for this line being the here doc delimiter. Otherwise, if we're in a here document, mark the next character as the beginning of a line. */ if (ch == '\n') { if ((tflags & LEX_HEREDELIM) && heredelim) { tflags &= ~LEX_HEREDELIM; tflags |= LEX_INHEREDOC; lex_firstind = retind + 1; } else if (tflags & LEX_INHEREDOC) { int tind; tind = lex_firstind; while ((tflags & LEX_STRIPDOC) && ret[tind] == '\t') tind++; if (STREQN (ret + tind, heredelim, hdlen)) { tflags &= ~(LEX_STRIPDOC|LEX_INHEREDOC); /*itrace("parse_comsub:%d: found here doc end `%s'", line_number, ret + tind);*/ free (heredelim); heredelim = 0; lex_firstind = -1; } else lex_firstind = retind + 1; } } /* Possible reprompting. */ if (ch == '\n' && SHOULD_PROMPT ()) prompt_again (); /* XXX -- possibly allow here doc to be delimited by ending right paren. */ if ((tflags & LEX_INHEREDOC) && ch == close && count == 1) { int tind; /*itrace("parse_comsub: in here doc, ch == close, retind - firstind = %d hdlen = %d retind = %d", retind-lex_firstind, hdlen, retind);*/ tind = lex_firstind; while ((tflags & LEX_STRIPDOC) && ret[tind] == '\t') tind++; if (retind-tind == hdlen && STREQN (ret + tind, heredelim, hdlen)) { tflags &= ~(LEX_STRIPDOC|LEX_INHEREDOC); /*itrace("parse_comsub:%d: found here doc end `%s'", line_number, ret + tind);*/ free (heredelim); heredelim = 0; lex_firstind = -1; } } /* Don't bother counting parens or doing anything else if in a comment */ if (tflags & (LEX_INCOMMENT|LEX_INHEREDOC)) { /* Add this character. */ RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = ch; if ((tflags & LEX_INCOMMENT) && ch == '\n') { /*itrace("parse_comsub:%d: lex_incomment -> 0 ch = `%c'", line_number, ch);*/ tflags &= ~LEX_INCOMMENT; } continue; } if (tflags & LEX_PASSNEXT) /* last char was backslash */ { /*itrace("parse_comsub:%d: lex_passnext -> 0 ch = `%c' (%d)", line_number, ch, __LINE__);*/ tflags &= ~LEX_PASSNEXT; if (qc != '\'' && ch == '\n') /* double-quoted \ disappears. */ { if (retind > 0) retind--; /* swallow previously-added backslash */ continue; } RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64); if MBTEST(ch == CTLESC || ch == CTLNUL) ret[retind++] = CTLESC; ret[retind++] = ch; continue; } /* If this is a shell break character, we are not in a word. If not, we either start or continue a word. */ if MBTEST(shellbreak (ch)) { tflags &= ~LEX_INWORD; /*itrace("parse_comsub:%d: lex_inword -> 0 ch = `%c' (%d)", line_number, ch, __LINE__);*/ } else { if (tflags & LEX_INWORD) { lex_wlen++; /*itrace("parse_comsub:%d: lex_inword == 1 ch = `%c' lex_wlen = %d (%d)", line_number, ch, lex_wlen, __LINE__);*/ } else { /*itrace("parse_comsub:%d: lex_inword -> 1 ch = `%c' (%d)", line_number, ch, __LINE__);*/ tflags |= LEX_INWORD; lex_wlen = 0; } } /* Skip whitespace */ if MBTEST(shellblank (ch) && lex_rwlen == 0) { /* Add this character. */ RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = ch; continue; } /* Either we are looking for the start of the here-doc delimiter (lex_firstind == -1) or we are reading one (lex_firstind >= 0). If this character is a shell break character and we are reading the delimiter, save it and note that we are now reading a here document. If we've found the start of the delimiter, note it by setting lex_firstind. Backslashes can quote shell metacharacters in here-doc delimiters. */ if (tflags & LEX_HEREDELIM) { if (lex_firstind == -1 && shellbreak (ch) == 0) lex_firstind = retind; #if 0 else if (heredelim && (tflags & LEX_PASSNEXT) == 0 && ch == '\n') { tflags |= LEX_INHEREDOC; tflags &= ~LEX_HEREDELIM; lex_firstind = retind + 1; } #endif else if (lex_firstind >= 0 && (tflags & LEX_PASSNEXT) == 0 && shellbreak (ch)) { if (heredelim == 0) { nestret = substring (ret, lex_firstind, retind); heredelim = string_quote_removal (nestret, 0); free (nestret); hdlen = STRLEN(heredelim); /*itrace("parse_comsub:%d: found here doc delimiter `%s' (%d)", line_number, heredelim, hdlen);*/ } if (ch == '\n') { tflags |= LEX_INHEREDOC; tflags &= ~LEX_HEREDELIM; lex_firstind = retind + 1; } else lex_firstind = -1; } } /* Meta-characters that can introduce a reserved word. Not perfect yet. */ if MBTEST((tflags & LEX_RESWDOK) == 0 && (tflags & LEX_CKCASE) && (tflags & LEX_INCOMMENT) == 0 && (shellmeta(ch) || ch == '\n')) { /* Add this character. */ RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = ch; peekc = shell_getc (1); if (ch == peekc && (ch == '&' || ch == '|' || ch == ';')) /* two-character tokens */ { RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = peekc; /*itrace("parse_comsub:%d: set lex_reswordok = 1, ch = `%c'", line_number, ch);*/ tflags |= LEX_RESWDOK; lex_rwlen = 0; continue; } else if (ch == '\n' || COMSUB_META(ch)) { shell_ungetc (peekc); /*itrace("parse_comsub:%d: set lex_reswordok = 1, ch = `%c'", line_number, ch);*/ tflags |= LEX_RESWDOK; lex_rwlen = 0; continue; } else if (ch == EOF) goto eof_error; else { /* `unget' the character we just added and fall through */ retind--; shell_ungetc (peekc); } } /* If we can read a reserved word, try to read one. */ if (tflags & LEX_RESWDOK) { if MBTEST(islower (ch)) { /* Add this character. */ RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = ch; lex_rwlen++; continue; } else if MBTEST(lex_rwlen == 4 && shellbreak (ch)) { if (STREQN (ret + retind - 4, "case", 4)) { tflags |= LEX_INCASE; /*itrace("parse_comsub:%d: found `case', lex_incase -> 1 lex_reswdok -> 0", line_number);*/ } else if (STREQN (ret + retind - 4, "esac", 4)) { tflags &= ~LEX_INCASE; /*itrace("parse_comsub:%d: found `esac', lex_incase -> 0 lex_reswdok -> 0", line_number);*/ } tflags &= ~LEX_RESWDOK; } else if MBTEST((tflags & LEX_CKCOMMENT) && ch == '#' && (lex_rwlen == 0 || ((tflags & LEX_INWORD) && lex_wlen == 0))) ; /* don't modify LEX_RESWDOK if we're starting a comment */ else if MBTEST((tflags & LEX_INCASE) && ch != '\n') /* If we can read a reserved word and we're in case, we're at the point where we can read a new pattern list or an esac. We handle the esac case above. If we read a newline, we want to leave LEX_RESWDOK alone. If we read anything else, we want to turn off LEX_RESWDOK, since we're going to read a pattern list. */ { tflags &= ~LEX_RESWDOK; /*itrace("parse_comsub:%d: lex_incase == 1 found `%c', lex_reswordok -> 0", line_number, ch);*/ } else if MBTEST(shellbreak (ch) == 0) { tflags &= ~LEX_RESWDOK; /*itrace("parse_comsub:%d: found `%c', lex_reswordok -> 0", line_number, ch);*/ } } /* Might be the start of a here-doc delimiter */ if MBTEST((tflags & LEX_INCOMMENT) == 0 && (tflags & LEX_CKCASE) && ch == '<') { /* Add this character. */ RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = ch; peekc = shell_getc (1); if (peekc == EOF) goto eof_error; if (peekc == ch) { RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = peekc; peekc = shell_getc (1); if (peekc == EOF) goto eof_error; if (peekc == '-') { RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = peekc; tflags |= LEX_STRIPDOC; } else shell_ungetc (peekc); if (peekc != '<') { tflags |= LEX_HEREDELIM; lex_firstind = -1; } continue; } else ch = peekc; /* fall through and continue XXX */ } else if MBTEST((tflags & LEX_CKCOMMENT) && (tflags & LEX_INCOMMENT) == 0 && ch == '#' && (((tflags & LEX_RESWDOK) && lex_rwlen == 0) || ((tflags & LEX_INWORD) && lex_wlen == 0))) { /*itrace("parse_comsub:%d: lex_incomment -> 1 (%d)", line_number, __LINE__);*/ tflags |= LEX_INCOMMENT; } if MBTEST(ch == CTLESC || ch == CTLNUL) /* special shell escapes */ { RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64); ret[retind++] = CTLESC; ret[retind++] = ch; continue; } #if 0 else if MBTEST((tflags & LEX_INCASE) && ch == close && close == ')') tflags &= ~LEX_INCASE; /* XXX */ #endif else if MBTEST(ch == close && (tflags & LEX_INCASE) == 0) /* ending delimiter */ { count--; /*itrace("parse_comsub:%d: found close: count = %d", line_number, count);*/ } else if MBTEST(((flags & P_FIRSTCLOSE) == 0) && (tflags & LEX_INCASE) == 0 && ch == open) /* nested begin */ { count++; /*itrace("parse_comsub:%d: found open: count = %d", line_number, count);*/ } /* Add this character. */ RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); ret[retind++] = ch; /* If we just read the ending character, don't bother continuing. */ if (count == 0) break; if MBTEST(ch == '\\') /* backslashes */ tflags |= LEX_PASSNEXT; if MBTEST(shellquote (ch)) { /* '', ``, or "" inside $(...). */ push_delimiter (dstack, ch); if MBTEST((tflags & LEX_WASDOL) && ch == '\'') /* $'...' inside group */ nestret = parse_matched_pair (ch, ch, ch, &nestlen, P_ALLOWESC|rflags); else nestret = parse_matched_pair (ch, ch, ch, &nestlen, rflags); pop_delimiter (dstack); CHECK_NESTRET_ERROR (); if MBTEST((tflags & LEX_WASDOL) && ch == '\'' && (extended_quote || (rflags & P_DQUOTE) == 0)) { /* Translate $'...' here. */ ttrans = ansiexpand (nestret, 0, nestlen - 1, &ttranslen); xfree (nestret); if ((rflags & P_DQUOTE) == 0) { nestret = sh_single_quote (ttrans); free (ttrans); nestlen = strlen (nestret); } else { nestret = ttrans; nestlen = ttranslen; } retind -= 2; /* back up before the $' */ } else if MBTEST((tflags & LEX_WASDOL) && ch == '"' && (extended_quote || (rflags & P_DQUOTE) == 0)) { /* Locale expand $"..." here. */ ttrans = localeexpand (nestret, 0, nestlen - 1, start_lineno, &ttranslen); xfree (nestret); nestret = sh_mkdoublequoted (ttrans, ttranslen, 0); free (ttrans); nestlen = ttranslen + 2; retind -= 2; /* back up before the $" */ } APPEND_NESTRET (); FREE (nestret); } else if MBTEST((tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */ /* check for $(), $[], or ${} inside command substitution. */ { if ((tflags & LEX_INCASE) == 0 && open == ch) /* undo previous increment */ count--; if (ch == '(') /* ) */ nestret = parse_comsub (0, '(', ')', &nestlen, (rflags|P_COMMAND) & ~P_DQUOTE); else if (ch == '{') /* } */ nestret = parse_matched_pair (0, '{', '}', &nestlen, P_FIRSTCLOSE|rflags); else if (ch == '[') /* ] */ nestret = parse_matched_pair (0, '[', ']', &nestlen, rflags); CHECK_NESTRET_ERROR (); APPEND_NESTRET (); FREE (nestret); } if MBTEST(ch == '$') tflags |= LEX_WASDOL; else tflags &= ~LEX_WASDOL; } FREE (heredelim); ret[retind] = '\0'; if (lenp) *lenp = retind; /*itrace("parse_comsub:%d: returning `%s'", line_number, ret);*/ return ret; } /* XXX - this needs to handle functionality like subst.c:no_longjmp_on_fatal_error; maybe extract_command_subst should handle it. */ char * xparse_dolparen (base, string, indp, flags) char *base; char *string; int *indp; int flags; { sh_parser_state_t ps; int orig_ind, nc, sflags; char *ret, *s, *ep, *ostring; /*yydebug = 1;*/ orig_ind = *indp; ostring = string; sflags = SEVAL_NONINT|SEVAL_NOHIST|SEVAL_NOFREE; if (flags & SX_NOLONGJMP) sflags |= SEVAL_NOLONGJMP; save_parser_state (&ps); /*(*/ parser_state |= PST_CMDSUBST|PST_EOFTOKEN; /* allow instant ')' */ /*(*/ shell_eof_token = ')'; parse_string (string, "command substitution", sflags, &ep); restore_parser_state (&ps); reset_parser (); if (interactive) token_to_read = 0; /* Need to find how many characters parse_and_execute consumed, update *indp, if flags != 0, copy the portion of the string parsed into RET and return it. If flags & 1 (EX_NOALLOC) we can return NULL. */ /*(*/ if (ep[-1] != ')') { #if DEBUG if (ep[-1] != '\n') itrace("xparse_dolparen:%d: ep[-1] != RPAREN (%d), ep = `%s'", line_number, ep[-1], ep); #endif while (ep > ostring && ep[-1] == '\n') ep--; } nc = ep - ostring; *indp = ep - base - 1; /*(*/ #if DEBUG if (base[*indp] != ')') itrace("xparse_dolparen:%d: base[%d] != RPAREN (%d), base = `%s'", line_number, *indp, base[*indp], base); #endif if (flags & SX_NOALLOC) return (char *)NULL; if (nc == 0) { ret = xmalloc (1); ret[0] = '\0'; } else ret = substring (ostring, 0, nc - 1); return ret; } #if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND) /* Parse a double-paren construct. It can be either an arithmetic command, an arithmetic `for' command, or a nested subshell. Returns the parsed token, -1 on error, or -2 if we didn't do anything and should just go on. */ static int parse_dparen (c) int c; { int cmdtyp, sline; char *wval; WORD_DESC *wd; #if defined (ARITH_FOR_COMMAND) if (last_read_token == FOR) { arith_for_lineno = line_number; cmdtyp = parse_arith_cmd (&wval, 0); if (cmdtyp == 1) { wd = alloc_word_desc (); wd->word = wval; yylval.word_list = make_word_list (wd, (WORD_LIST *)NULL); return (ARITH_FOR_EXPRS); } else return -1; /* ERROR */ } #endif #if defined (DPAREN_ARITHMETIC) if (reserved_word_acceptable (last_read_token)) { sline = line_number; cmdtyp = parse_arith_cmd (&wval, 0); if (cmdtyp == 1) /* arithmetic command */ { wd = alloc_word_desc (); wd->word = wval; wd->flags = W_QUOTED|W_NOSPLIT|W_NOGLOB|W_DQUOTE; yylval.word_list = make_word_list (wd, (WORD_LIST *)NULL); return (ARITH_CMD); } else if (cmdtyp == 0) /* nested subshell */ { push_string (wval, 0, (alias_t *)NULL); if ((parser_state & PST_CASEPAT) == 0) parser_state |= PST_SUBSHELL; return (c); } else /* ERROR */ return -1; } #endif return -2; /* XXX */ } /* We've seen a `(('. Look for the matching `))'. If we get it, return 1. If not, assume it's a nested subshell for backwards compatibility and return 0. In any case, put the characters we've consumed into a locally- allocated buffer and make *ep point to that buffer. Return -1 on an error, for example EOF. */ static int parse_arith_cmd (ep, adddq) char **ep; int adddq; { int exp_lineno, rval, c; char *ttok, *tokstr; int ttoklen; exp_lineno = line_number; ttok = parse_matched_pair (0, '(', ')', &ttoklen, 0); rval = 1; if (ttok == &matched_pair_error) return -1; /* Check that the next character is the closing right paren. If not, this is a syntax error. ( */ c = shell_getc (0); if MBTEST(c != ')') rval = 0; tokstr = (char *)xmalloc (ttoklen + 4); /* if ADDDQ != 0 then (( ... )) -> "..." */ if (rval == 1 && adddq) /* arith cmd, add double quotes */ { tokstr[0] = '"'; strncpy (tokstr + 1, ttok, ttoklen - 1); tokstr[ttoklen] = '"'; tokstr[ttoklen+1] = '\0'; } else if (rval == 1) /* arith cmd, don't add double quotes */ { strncpy (tokstr, ttok, ttoklen - 1); tokstr[ttoklen-1] = '\0'; } else /* nested subshell */ { tokstr[0] = '('; strncpy (tokstr + 1, ttok, ttoklen - 1); tokstr[ttoklen] = ')'; tokstr[ttoklen+1] = c; tokstr[ttoklen+2] = '\0'; } *ep = tokstr; FREE (ttok); return rval; } #endif /* DPAREN_ARITHMETIC || ARITH_FOR_COMMAND */ #if defined (COND_COMMAND) static void cond_error () { char *etext; if (EOF_Reached && cond_token != COND_ERROR) /* [[ */ parser_error (cond_lineno, _("unexpected EOF while looking for `]]'")); else if (cond_token != COND_ERROR) { if (etext = error_token_from_token (cond_token)) { parser_error (cond_lineno, _("syntax error in conditional expression: unexpected token `%s'"), etext); free (etext); } else parser_error (cond_lineno, _("syntax error in conditional expression")); } } static COND_COM * cond_expr () { return (cond_or ()); } static COND_COM * cond_or () { COND_COM *l, *r; l = cond_and (); if (cond_token == OR_OR) { r = cond_or (); l = make_cond_node (COND_OR, (WORD_DESC *)NULL, l, r); } return l; } static COND_COM * cond_and () { COND_COM *l, *r; l = cond_term (); if (cond_token == AND_AND) { r = cond_and (); l = make_cond_node (COND_AND, (WORD_DESC *)NULL, l, r); } return l; } static int cond_skip_newlines () { while ((cond_token = read_token (READ)) == '\n') { if (SHOULD_PROMPT ()) prompt_again (); } return (cond_token); } #define COND_RETURN_ERROR() \ do { cond_token = COND_ERROR; return ((COND_COM *)NULL); } while (0) static COND_COM * cond_term () { WORD_DESC *op; COND_COM *term, *tleft, *tright; int tok, lineno; char *etext; /* Read a token. It can be a left paren, a `!', a unary operator, or a word that should be the first argument of a binary operator. Start by skipping newlines, since this is a compound command. */ tok = cond_skip_newlines (); lineno = line_number; if (tok == COND_END) { COND_RETURN_ERROR (); } else if (tok == '(') { term = cond_expr (); if (cond_token != ')') { if (term) dispose_cond_node (term); /* ( */ if (etext = error_token_from_token (cond_token)) { parser_error (lineno, _("unexpected token `%s', expected `)'"), etext); free (etext); } else parser_error (lineno, _("expected `)'")); COND_RETURN_ERROR (); } term = make_cond_node (COND_EXPR, (WORD_DESC *)NULL, term, (COND_COM *)NULL); (void)cond_skip_newlines (); } else if (tok == BANG || (tok == WORD && (yylval.word->word[0] == '!' && yylval.word->word[1] == '\0'))) { if (tok == WORD) dispose_word (yylval.word); /* not needed */ term = cond_term (); if (term) term->flags |= CMD_INVERT_RETURN; } else if (tok == WORD && yylval.word->word[0] == '-' && yylval.word->word[2] == 0 && test_unop (yylval.word->word)) { op = yylval.word; tok = read_token (READ); if (tok == WORD) { tleft = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL); term = make_cond_node (COND_UNARY, op, tleft, (COND_COM *)NULL); } else { dispose_word (op); if (etext = error_token_from_token (tok)) { parser_error (line_number, _("unexpected argument `%s' to conditional unary operator"), etext); free (etext); } else parser_error (line_number, _("unexpected argument to conditional unary operator")); COND_RETURN_ERROR (); } (void)cond_skip_newlines (); } else if (tok == WORD) /* left argument to binary operator */ { /* lhs */ tleft = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL); /* binop */ tok = read_token (READ); if (tok == WORD && test_binop (yylval.word->word)) { op = yylval.word; if (op->word[0] == '=' && (op->word[1] == '\0' || (op->word[1] == '=' && op->word[2] == '\0'))) parser_state |= PST_EXTPAT; else if (op->word[0] == '!' && op->word[1] == '=' && op->word[2] == '\0') parser_state |= PST_EXTPAT; } #if defined (COND_REGEXP) else if (tok == WORD && STREQ (yylval.word->word, "=~")) { op = yylval.word; parser_state |= PST_REGEXP; } #endif else if (tok == '<' || tok == '>') op = make_word_from_token (tok); /* ( */ /* There should be a check before blindly accepting the `)' that we have seen the opening `('. */ else if (tok == COND_END || tok == AND_AND || tok == OR_OR || tok == ')') { /* Special case. [[ x ]] is equivalent to [[ -n x ]], just like the test command. Similarly for [[ x && expr ]] or [[ x || expr ]] or [[ (x) ]]. */ op = make_word ("-n"); term = make_cond_node (COND_UNARY, op, tleft, (COND_COM *)NULL); cond_token = tok; return (term); } else { if (etext = error_token_from_token (tok)) { parser_error (line_number, _("unexpected token `%s', conditional binary operator expected"), etext); free (etext); } else parser_error (line_number, _("conditional binary operator expected")); dispose_cond_node (tleft); COND_RETURN_ERROR (); } /* rhs */ if (parser_state & PST_EXTPAT) extended_glob = 1; tok = read_token (READ); if (parser_state & PST_EXTPAT) extended_glob = global_extglob; parser_state &= ~(PST_REGEXP|PST_EXTPAT); if (tok == WORD) { tright = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL); term = make_cond_node (COND_BINARY, op, tleft, tright); } else { if (etext = error_token_from_token (tok)) { parser_error (line_number, _("unexpected argument `%s' to conditional binary operator"), etext); free (etext); } else parser_error (line_number, _("unexpected argument to conditional binary operator")); dispose_cond_node (tleft); dispose_word (op); COND_RETURN_ERROR (); } (void)cond_skip_newlines (); } else { if (tok < 256) parser_error (line_number, _("unexpected token `%c' in conditional command"), tok); else if (etext = error_token_from_token (tok)) { parser_error (line_number, _("unexpected token `%s' in conditional command"), etext); free (etext); } else parser_error (line_number, _("unexpected token %d in conditional command"), tok); COND_RETURN_ERROR (); } return (term); } /* This is kind of bogus -- we slip a mini recursive-descent parser in here to handle the conditional statement syntax. */ static COMMAND * parse_cond_command () { COND_COM *cexp; global_extglob = extended_glob; cexp = cond_expr (); return (make_cond_command (cexp)); } #endif #if defined (ARRAY_VARS) /* When this is called, it's guaranteed that we don't care about anything in t beyond i. We do save and restore the chars, though. */ static int token_is_assignment (t, i) char *t; int i; { unsigned char c, c1; int r; c = t[i]; c1 = t[i+1]; t[i] = '='; t[i+1] = '\0'; r = assignment (t, (parser_state & PST_COMPASSIGN) != 0); t[i] = c; t[i+1] = c1; return r; } /* XXX - possible changes here for `+=' */ static int token_is_ident (t, i) char *t; int i; { unsigned char c; int r; c = t[i]; t[i] = '\0'; r = legal_identifier (t); t[i] = c; return r; } #endif static int read_token_word (character) int character; { /* The value for YYLVAL when a WORD is read. */ WORD_DESC *the_word; /* Index into the token that we are building. */ int token_index; /* ALL_DIGITS becomes zero when we see a non-digit. */ int all_digit_token; /* DOLLAR_PRESENT becomes non-zero if we see a `$'. */ int dollar_present; /* COMPOUND_ASSIGNMENT becomes non-zero if we are parsing a compound assignment. */ int compound_assignment; /* QUOTED becomes non-zero if we see one of ("), ('), (`), or (\). */ int quoted; /* Non-zero means to ignore the value of the next character, and just to add it no matter what. */ int pass_next_character; /* The current delimiting character. */ int cd; int result, peek_char; char *ttok, *ttrans; int ttoklen, ttranslen; intmax_t lvalue; if (token_buffer_size < TOKEN_DEFAULT_INITIAL_SIZE) token = (char *)xrealloc (token, token_buffer_size = TOKEN_DEFAULT_INITIAL_SIZE); token_index = 0; all_digit_token = DIGIT (character); dollar_present = quoted = pass_next_character = compound_assignment = 0; for (;;) { if (character == EOF) goto got_token; if (pass_next_character) { pass_next_character = 0; goto got_escaped_character; } cd = current_delimiter (dstack); /* Handle backslashes. Quote lots of things when not inside of double-quotes, quote some things inside of double-quotes. */ if MBTEST(character == '\\') { peek_char = shell_getc (0); /* Backslash-newline is ignored in all cases except when quoted with single quotes. */ if (peek_char == '\n') { character = '\n'; goto next_character; } else { shell_ungetc (peek_char); /* If the next character is to be quoted, note it now. */ if (cd == 0 || cd == '`' || (cd == '"' && peek_char >= 0 && (sh_syntaxtab[peek_char] & CBSDQUOTE))) pass_next_character++; quoted = 1; goto got_character; } } /* Parse a matched pair of quote characters. */ if MBTEST(shellquote (character)) { push_delimiter (dstack, character); ttok = parse_matched_pair (character, character, character, &ttoklen, (character == '`') ? P_COMMAND : 0); pop_delimiter (dstack); if (ttok == &matched_pair_error) return -1; /* Bail immediately. */ RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2, token_buffer_size, TOKEN_DEFAULT_GROW_SIZE); token[token_index++] = character; strcpy (token + token_index, ttok); token_index += ttoklen; all_digit_token = 0; quoted = 1; dollar_present |= (character == '"' && strchr (ttok, '$') != 0); FREE (ttok); goto next_character; } #ifdef COND_REGEXP /* When parsing a regexp as a single word inside a conditional command, we need to special-case characters special to both the shell and regular expressions. Right now, that is only '(' and '|'. */ /*)*/ if MBTEST((parser_state & PST_REGEXP) && (character == '(' || character == '|')) /*)*/ { if (character == '|') goto got_character; push_delimiter (dstack, character); ttok = parse_matched_pair (cd, '(', ')', &ttoklen, 0); pop_delimiter (dstack); if (ttok == &matched_pair_error) return -1; /* Bail immediately. */ RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2, token_buffer_size, TOKEN_DEFAULT_GROW_SIZE); token[token_index++] = character; strcpy (token + token_index, ttok); token_index += ttoklen; FREE (ttok); dollar_present = all_digit_token = 0; goto next_character; } #endif /* COND_REGEXP */ #ifdef EXTENDED_GLOB /* Parse a ksh-style extended pattern matching specification. */ if MBTEST(extended_glob && PATTERN_CHAR (character)) { peek_char = shell_getc (1); if MBTEST(peek_char == '(') /* ) */ { push_delimiter (dstack, peek_char); ttok = parse_matched_pair (cd, '(', ')', &ttoklen, 0); pop_delimiter (dstack); if (ttok == &matched_pair_error) return -1; /* Bail immediately. */ RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2, token_buffer_size, TOKEN_DEFAULT_GROW_SIZE); token[token_index++] = character; token[token_index++] = peek_char; strcpy (token + token_index, ttok); token_index += ttoklen; FREE (ttok); dollar_present = all_digit_token = 0; goto next_character; } else shell_ungetc (peek_char); } #endif /* EXTENDED_GLOB */ /* If the delimiter character is not single quote, parse some of the shell expansions that must be read as a single word. */ if (shellexp (character)) { peek_char = shell_getc (1); /* $(...), <(...), >(...), $((...)), ${...}, and $[...] constructs */ if MBTEST(peek_char == '(' || \ ((peek_char == '{' || peek_char == '[') && character == '$')) /* ) ] } */ { if (peek_char == '{') /* } */ ttok = parse_matched_pair (cd, '{', '}', &ttoklen, P_FIRSTCLOSE); else if (peek_char == '(') /* ) */ { /* XXX - push and pop the `(' as a delimiter for use by the command-oriented-history code. This way newlines appearing in the $(...) string get added to the history literally rather than causing a possibly- incorrect `;' to be added. ) */ push_delimiter (dstack, peek_char); ttok = parse_comsub (cd, '(', ')', &ttoklen, P_COMMAND); pop_delimiter (dstack); } else ttok = parse_matched_pair (cd, '[', ']', &ttoklen, 0); if (ttok == &matched_pair_error) return -1; /* Bail immediately. */ RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2, token_buffer_size, TOKEN_DEFAULT_GROW_SIZE); token[token_index++] = character; token[token_index++] = peek_char; strcpy (token + token_index, ttok); token_index += ttoklen; FREE (ttok); dollar_present = 1; all_digit_token = 0; goto next_character; } /* This handles $'...' and $"..." new-style quoted strings. */ else if MBTEST(character == '$' && (peek_char == '\'' || peek_char == '"')) { int first_line; first_line = line_number; push_delimiter (dstack, peek_char); ttok = parse_matched_pair (peek_char, peek_char, peek_char, &ttoklen, (peek_char == '\'') ? P_ALLOWESC : 0); pop_delimiter (dstack); if (ttok == &matched_pair_error) return -1; if (peek_char == '\'') { ttrans = ansiexpand (ttok, 0, ttoklen - 1, &ttranslen); free (ttok); /* Insert the single quotes and correctly quote any embedded single quotes (allowed because P_ALLOWESC was passed to parse_matched_pair). */ ttok = sh_single_quote (ttrans); free (ttrans); ttranslen = strlen (ttok); ttrans = ttok; } else { /* Try to locale-expand the converted string. */ ttrans = localeexpand (ttok, 0, ttoklen - 1, first_line, &ttranslen); free (ttok); /* Add the double quotes back */ ttok = sh_mkdoublequoted (ttrans, ttranslen, 0); free (ttrans); ttranslen += 2; ttrans = ttok; } RESIZE_MALLOCED_BUFFER (token, token_index, ttranslen + 2, token_buffer_size, TOKEN_DEFAULT_GROW_SIZE); strcpy (token + token_index, ttrans); token_index += ttranslen; FREE (ttrans); quoted = 1; all_digit_token = 0; goto next_character; } /* This could eventually be extended to recognize all of the shell's single-character parameter expansions, and set flags.*/ else if MBTEST(character == '$' && peek_char == '$') { ttok = (char *)xmalloc (3); ttok[0] = ttok[1] = '$'; ttok[2] = '\0'; RESIZE_MALLOCED_BUFFER (token, token_index, 3, token_buffer_size, TOKEN_DEFAULT_GROW_SIZE); strcpy (token + token_index, ttok); token_index += 2; dollar_present = 1; all_digit_token = 0; FREE (ttok); goto next_character; } else shell_ungetc (peek_char); } #if defined (ARRAY_VARS) /* Identify possible array subscript assignment; match [...]. If parser_state&PST_COMPASSIGN, we need to parse [sub]=words treating `sub' as if it were enclosed in double quotes. */ else if MBTEST(character == '[' && /* ] */ ((token_index > 0 && assignment_acceptable (last_read_token) && token_is_ident (token, token_index)) || (token_index == 0 && (parser_state&PST_COMPASSIGN)))) { ttok = parse_matched_pair (cd, '[', ']', &ttoklen, P_ARRAYSUB); if (ttok == &matched_pair_error) return -1; /* Bail immediately. */ RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2, token_buffer_size, TOKEN_DEFAULT_GROW_SIZE); token[token_index++] = character; strcpy (token + token_index, ttok); token_index += ttoklen; FREE (ttok); all_digit_token = 0; goto next_character; } /* Identify possible compound array variable assignment. */ else if MBTEST(character == '=' && token_index > 0 && (assignment_acceptable (last_read_token) || (parser_state & PST_ASSIGNOK)) && token_is_assignment (token, token_index)) { peek_char = shell_getc (1); if MBTEST(peek_char == '(') /* ) */ { ttok = parse_compound_assignment (&ttoklen); RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 4, token_buffer_size, TOKEN_DEFAULT_GROW_SIZE); token[token_index++] = '='; token[token_index++] = '('; if (ttok) { strcpy (token + token_index, ttok); token_index += ttoklen; } token[token_index++] = ')'; FREE (ttok); all_digit_token = 0; compound_assignment = 1; #if 1 goto next_character; #else goto got_token; /* ksh93 seems to do this */ #endif } else shell_ungetc (peek_char); } #endif /* When not parsing a multi-character word construct, shell meta- characters break words. */ if MBTEST(shellbreak (character)) { shell_ungetc (character); goto got_token; } got_character: if (character == CTLESC || character == CTLNUL) token[token_index++] = CTLESC; got_escaped_character: all_digit_token &= DIGIT (character); dollar_present |= character == '$'; token[token_index++] = character; RESIZE_MALLOCED_BUFFER (token, token_index, 1, token_buffer_size, TOKEN_DEFAULT_GROW_SIZE); next_character: if (character == '\n' && SHOULD_PROMPT ()) prompt_again (); /* We want to remove quoted newlines (that is, a \ pair) unless we are within single quotes or pass_next_character is set (the shell equivalent of literal-next). */ cd = current_delimiter (dstack); character = shell_getc (cd != '\'' && pass_next_character == 0); } /* end for (;;) */ got_token: token[token_index] = '\0'; /* Check to see what thing we should return. If the last_read_token is a `<', or a `&', or the character which ended this token is a '>' or '<', then, and ONLY then, is this input token a NUMBER. Otherwise, it is just a word, and should be returned as such. */ if MBTEST(all_digit_token && (character == '<' || character == '>' || \ last_read_token == LESS_AND || \ last_read_token == GREATER_AND)) { if (legal_number (token, &lvalue) && (int)lvalue == lvalue) yylval.number = lvalue; else yylval.number = -1; return (NUMBER); } /* Check for special case tokens. */ result = (last_shell_getc_is_singlebyte) ? special_case_tokens (token) : -1; if (result >= 0) return result; #if defined (ALIAS) /* Posix.2 does not allow reserved words to be aliased, so check for all of them, including special cases, before expanding the current token as an alias. */ if MBTEST(posixly_correct) CHECK_FOR_RESERVED_WORD (token); /* Aliases are expanded iff EXPAND_ALIASES is non-zero, and quoting inhibits alias expansion. */ if (expand_aliases && quoted == 0) { result = alias_expand_token (token); if (result == RE_READ_TOKEN) return (RE_READ_TOKEN); else if (result == NO_EXPANSION) parser_state &= ~PST_ALEXPNEXT; } /* If not in Posix.2 mode, check for reserved words after alias expansion. */ if MBTEST(posixly_correct == 0) #endif CHECK_FOR_RESERVED_WORD (token); the_word = (WORD_DESC *)xmalloc (sizeof (WORD_DESC)); the_word->word = (char *)xmalloc (1 + token_index); the_word->flags = 0; strcpy (the_word->word, token); if (dollar_present) the_word->flags |= W_HASDOLLAR; if (quoted) the_word->flags |= W_QUOTED; /*(*/ if (compound_assignment && token[token_index-1] == ')') the_word->flags |= W_COMPASSIGN; /* A word is an assignment if it appears at the beginning of a simple command, or after another assignment word. This is context-dependent, so it cannot be handled in the grammar. */ if (assignment (token, (parser_state & PST_COMPASSIGN) != 0)) { the_word->flags |= W_ASSIGNMENT; /* Don't perform word splitting on assignment statements. */ if (assignment_acceptable (last_read_token) || (parser_state & PST_COMPASSIGN) != 0) the_word->flags |= W_NOSPLIT; } if (command_token_position (last_read_token)) { struct builtin *b; b = builtin_address_internal (token, 0); if (b && (b->flags & ASSIGNMENT_BUILTIN)) parser_state |= PST_ASSIGNOK; else if (STREQ (token, "eval") || STREQ (token, "let")) parser_state |= PST_ASSIGNOK; } yylval.word = the_word; if (token[0] == '{' && token[token_index-1] == '}' && (character == '<' || character == '>')) { /* can use token; already copied to the_word */ token[token_index-1] = '\0'; if (legal_identifier (token+1)) { strcpy (the_word->word, token+1); /*itrace("read_token_word: returning REDIR_WORD for %s", the_word->word);*/ return (REDIR_WORD); } } result = ((the_word->flags & (W_ASSIGNMENT|W_NOSPLIT)) == (W_ASSIGNMENT|W_NOSPLIT)) ? ASSIGNMENT_WORD : WORD; switch (last_read_token) { case FUNCTION: parser_state |= PST_ALLOWOPNBRC; function_dstart = line_number; break; case CASE: case SELECT: case FOR: if (word_top < MAX_CASE_NEST) word_top++; word_lineno[word_top] = line_number; break; } return (result); } /* Return 1 if TOKSYM is a token that after being read would allow a reserved word to be seen, else 0. */ static int reserved_word_acceptable (toksym) int toksym; { switch (toksym) { case '\n': case ';': case '(': case ')': case '|': case '&': case '{': case '}': /* XXX */ case AND_AND: case BANG: case BAR_AND: case DO: case DONE: case ELIF: case ELSE: case ESAC: case FI: case IF: case OR_OR: case SEMI_SEMI: case SEMI_AND: case SEMI_SEMI_AND: case THEN: case TIME: case TIMEOPT: case COPROC: case UNTIL: case WHILE: case 0: return 1; default: #if defined (COPROCESS_SUPPORT) if (last_read_token == WORD && token_before_that == COPROC) return 1; #endif return 0; } } /* Return the index of TOKEN in the alist of reserved words, or -1 if TOKEN is not a shell reserved word. */ int find_reserved_word (tokstr) char *tokstr; { int i; for (i = 0; word_token_alist[i].word; i++) if (STREQ (tokstr, word_token_alist[i].word)) return i; return -1; } #if 0 #if defined (READLINE) /* Called after each time readline is called. This insures that whatever the new prompt string is gets propagated to readline's local prompt variable. */ static void reset_readline_prompt () { char *temp_prompt; if (prompt_string_pointer) { temp_prompt = (*prompt_string_pointer) ? decode_prompt_string (*prompt_string_pointer) : (char *)NULL; if (temp_prompt == 0) { temp_prompt = (char *)xmalloc (1); temp_prompt[0] = '\0'; } FREE (current_readline_prompt); current_readline_prompt = temp_prompt; } } #endif /* READLINE */ #endif /* 0 */ #if defined (HISTORY) /* A list of tokens which can be followed by newlines, but not by semi-colons. When concatenating multiple lines of history, the newline separator for such tokens is replaced with a space. */ static const int no_semi_successors[] = { '\n', '{', '(', ')', ';', '&', '|', CASE, DO, ELSE, IF, SEMI_SEMI, SEMI_AND, SEMI_SEMI_AND, THEN, UNTIL, WHILE, AND_AND, OR_OR, IN, 0 }; /* If we are not within a delimited expression, try to be smart about which separators can be semi-colons and which must be newlines. Returns the string that should be added into the history entry. */ char * history_delimiting_chars () { register int i; if (dstack.delimiter_depth != 0) return ("\n"); /* We look for current_command_line_count == 2 because we are looking to add the first line of the body of the here document (the second line of the command). */ if (parser_state & PST_HEREDOC) return (current_command_line_count == 2 ? "\n" : ""); /* First, handle some special cases. */ /*(*/ /* If we just read `()', assume it's a function definition, and don't add a semicolon. If the token before the `)' was not `(', and we're not in the midst of parsing a case statement, assume it's a parenthesized command and add the semicolon. */ /*)(*/ if (token_before_that == ')') { if (two_tokens_ago == '(') /*)*/ /* function def */ return " "; /* This does not work for subshells inside case statement command lists. It's a suboptimal solution. */ else if (parser_state & PST_CASESTMT) /* case statement pattern */ return " "; else return "; "; /* (...) subshell */ } else if (token_before_that == WORD && two_tokens_ago == FUNCTION) return " "; /* function def using `function name' without `()' */ else if (token_before_that == WORD && two_tokens_ago == FOR) { /* Tricky. `for i\nin ...' should not have a semicolon, but `for i\ndo ...' should. We do what we can. */ for (i = shell_input_line_index; whitespace (shell_input_line[i]); i++) ; if (shell_input_line[i] && shell_input_line[i] == 'i' && shell_input_line[i+1] == 'n') return " "; return ";"; } else if (two_tokens_ago == CASE && token_before_that == WORD && (parser_state & PST_CASESTMT)) return " "; for (i = 0; no_semi_successors[i]; i++) { if (token_before_that == no_semi_successors[i]) return (" "); } return ("; "); } #endif /* HISTORY */ /* Issue a prompt, or prepare to issue a prompt when the next character is read. */ static void prompt_again () { char *temp_prompt; if (interactive == 0 || expanding_alias ()) /* XXX */ return; ps1_prompt = get_string_value ("PS1"); ps2_prompt = get_string_value ("PS2"); if (!prompt_string_pointer) prompt_string_pointer = &ps1_prompt; temp_prompt = *prompt_string_pointer ? decode_prompt_string (*prompt_string_pointer) : (char *)NULL; if (temp_prompt == 0) { temp_prompt = (char *)xmalloc (1); temp_prompt[0] = '\0'; } current_prompt_string = *prompt_string_pointer; prompt_string_pointer = &ps2_prompt; #if defined (READLINE) if (!no_line_editing) { FREE (current_readline_prompt); current_readline_prompt = temp_prompt; } else #endif /* READLINE */ { FREE (current_decoded_prompt); current_decoded_prompt = temp_prompt; } } int get_current_prompt_level () { return ((current_prompt_string && current_prompt_string == ps2_prompt) ? 2 : 1); } void set_current_prompt_level (x) int x; { prompt_string_pointer = (x == 2) ? &ps2_prompt : &ps1_prompt; current_prompt_string = *prompt_string_pointer; } static void print_prompt () { fprintf (stderr, "%s", current_decoded_prompt); fflush (stderr); } /* Return a string which will be printed as a prompt. The string may contain special characters which are decoded as follows: \a bell (ascii 07) \d the date in Day Mon Date format \e escape (ascii 033) \h the hostname up to the first `.' \H the hostname \j the number of active jobs \l the basename of the shell's tty device name \n CRLF \r CR \s the name of the shell \t the time in 24-hour hh:mm:ss format \T the time in 12-hour hh:mm:ss format \@ the time in 12-hour hh:mm am/pm format \A the time in 24-hour hh:mm format \D{fmt} the result of passing FMT to strftime(3) \u your username \v the version of bash (e.g., 2.00) \V the release of bash, version + patchlevel (e.g., 2.00.0) \w the current working directory \W the last element of $PWD \! the history number of this command \# the command number of this command \$ a $ or a # if you are root \nnn character code nnn in octal \\ a backslash \[ begin a sequence of non-printing chars \] end a sequence of non-printing chars */ #define PROMPT_GROWTH 48 char * decode_prompt_string (string) char *string; { WORD_LIST *list; char *result, *t; struct dstack save_dstack; int last_exit_value, last_comsub_pid; #if defined (PROMPT_STRING_DECODE) int result_size, result_index; int c, n, i; char *temp, octal_string[4]; struct tm *tm; time_t the_time; char timebuf[128]; char *timefmt; result = (char *)xmalloc (result_size = PROMPT_GROWTH); result[result_index = 0] = 0; temp = (char *)NULL; while (c = *string++) { if (posixly_correct && c == '!') { if (*string == '!') { temp = savestring ("!"); goto add_string; } else { #if !defined (HISTORY) temp = savestring ("1"); #else /* HISTORY */ temp = itos (history_number ()); #endif /* HISTORY */ string--; /* add_string increments string again. */ goto add_string; } } if (c == '\\') { c = *string; switch (c) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': strncpy (octal_string, string, 3); octal_string[3] = '\0'; n = read_octal (octal_string); temp = (char *)xmalloc (3); if (n == CTLESC || n == CTLNUL) { temp[0] = CTLESC; temp[1] = n; temp[2] = '\0'; } else if (n == -1) { temp[0] = '\\'; temp[1] = '\0'; } else { temp[0] = n; temp[1] = '\0'; } for (c = 0; n != -1 && c < 3 && ISOCTAL (*string); c++) string++; c = 0; /* tested at add_string: */ goto add_string; case 'd': case 't': case 'T': case '@': case 'A': /* Make the current time/date into a string. */ (void) time (&the_time); tm = localtime (&the_time); if (c == 'd') n = strftime (timebuf, sizeof (timebuf), "%a %b %d", tm); else if (c == 't') n = strftime (timebuf, sizeof (timebuf), "%H:%M:%S", tm); else if (c == 'T') n = strftime (timebuf, sizeof (timebuf), "%I:%M:%S", tm); else if (c == '@') n = strftime (timebuf, sizeof (timebuf), "%I:%M %p", tm); else if (c == 'A') n = strftime (timebuf, sizeof (timebuf), "%H:%M", tm); if (n == 0) timebuf[0] = '\0'; else timebuf[sizeof(timebuf) - 1] = '\0'; temp = savestring (timebuf); goto add_string; case 'D': /* strftime format */ if (string[1] != '{') /* } */ goto not_escape; (void) time (&the_time); tm = localtime (&the_time); string += 2; /* skip { */ timefmt = xmalloc (strlen (string) + 3); for (t = timefmt; *string && *string != '}'; ) *t++ = *string++; *t = '\0'; c = *string; /* tested at add_string */ if (timefmt[0] == '\0') { timefmt[0] = '%'; timefmt[1] = 'X'; /* locale-specific current time */ timefmt[2] = '\0'; } n = strftime (timebuf, sizeof (timebuf), timefmt, tm); free (timefmt); if (n == 0) timebuf[0] = '\0'; else timebuf[sizeof(timebuf) - 1] = '\0'; if (promptvars || posixly_correct) /* Make sure that expand_prompt_string is called with a second argument of Q_DOUBLE_QUOTES if we use this function here. */ temp = sh_backslash_quote_for_double_quotes (timebuf); else temp = savestring (timebuf); goto add_string; case 'n': temp = (char *)xmalloc (3); temp[0] = no_line_editing ? '\n' : '\r'; temp[1] = no_line_editing ? '\0' : '\n'; temp[2] = '\0'; goto add_string; case 's': temp = base_pathname (shell_name); temp = savestring (temp); goto add_string; case 'v': case 'V': temp = (char *)xmalloc (16); if (c == 'v') strcpy (temp, dist_version); else sprintf (temp, "%s.%d", dist_version, patch_level); goto add_string; case 'w': case 'W': { /* Use the value of PWD because it is much more efficient. */ char t_string[PATH_MAX]; int tlen; temp = get_string_value ("PWD"); if (temp == 0) { if (getcwd (t_string, sizeof(t_string)) == 0) { t_string[0] = '.'; tlen = 1; } else tlen = strlen (t_string); } else { tlen = sizeof (t_string) - 1; strncpy (t_string, temp, tlen); } t_string[tlen] = '\0'; #if defined (MACOSX) /* Convert from "fs" format to "input" format */ temp = fnx_fromfs (t_string, strlen (t_string)); if (temp != t_string) strcpy (t_string, temp); #endif #define ROOT_PATH(x) ((x)[0] == '/' && (x)[1] == 0) #define DOUBLE_SLASH_ROOT(x) ((x)[0] == '/' && (x)[1] == '/' && (x)[2] == 0) /* Abbreviate \W as ~ if $PWD == $HOME */ if (c == 'W' && (((t = get_string_value ("HOME")) == 0) || STREQ (t, t_string) == 0)) { if (ROOT_PATH (t_string) == 0 && DOUBLE_SLASH_ROOT (t_string) == 0) { t = strrchr (t_string, '/'); if (t) strcpy (t_string, t + 1); } } #undef ROOT_PATH #undef DOUBLE_SLASH_ROOT else /* polite_directory_format is guaranteed to return a string no longer than PATH_MAX - 1 characters. */ strcpy (t_string, polite_directory_format (t_string)); temp = trim_pathname (t_string, PATH_MAX - 1); /* If we're going to be expanding the prompt string later, quote the directory name. */ if (promptvars || posixly_correct) /* Make sure that expand_prompt_string is called with a second argument of Q_DOUBLE_QUOTES if we use this function here. */ temp = sh_backslash_quote_for_double_quotes (t_string); else temp = savestring (t_string); goto add_string; } case 'u': if (current_user.user_name == 0) get_current_user_info (); temp = savestring (current_user.user_name); goto add_string; case 'h': case 'H': temp = savestring (current_host_name); if (c == 'h' && (t = (char *)strchr (temp, '.'))) *t = '\0'; goto add_string; case '#': temp = itos (current_command_number); goto add_string; case '!': #if !defined (HISTORY) temp = savestring ("1"); #else /* HISTORY */ temp = itos (history_number ()); #endif /* HISTORY */ goto add_string; case '$': t = temp = (char *)xmalloc (3); if ((promptvars || posixly_correct) && (current_user.euid != 0)) *t++ = '\\'; *t++ = current_user.euid == 0 ? '#' : '$'; *t = '\0'; goto add_string; case 'j': temp = itos (count_all_jobs ()); goto add_string; case 'l': #if defined (HAVE_TTYNAME) temp = (char *)ttyname (fileno (stdin)); t = temp ? base_pathname (temp) : "tty"; temp = savestring (t); #else temp = savestring ("tty"); #endif /* !HAVE_TTYNAME */ goto add_string; #if defined (READLINE) case '[': case ']': if (no_line_editing) { string++; break; } temp = (char *)xmalloc (3); n = (c == '[') ? RL_PROMPT_START_IGNORE : RL_PROMPT_END_IGNORE; i = 0; if (n == CTLESC || n == CTLNUL) temp[i++] = CTLESC; temp[i++] = n; temp[i] = '\0'; goto add_string; #endif /* READLINE */ case '\\': case 'a': case 'e': case 'r': temp = (char *)xmalloc (2); if (c == 'a') temp[0] = '\07'; else if (c == 'e') temp[0] = '\033'; else if (c == 'r') temp[0] = '\r'; else /* (c == '\\') */ temp[0] = c; temp[1] = '\0'; goto add_string; default: not_escape: temp = (char *)xmalloc (3); temp[0] = '\\'; temp[1] = c; temp[2] = '\0'; add_string: if (c) string++; result = sub_append_string (temp, result, &result_index, &result_size); temp = (char *)NULL; /* Freed in sub_append_string (). */ result[result_index] = '\0'; break; } } else { RESIZE_MALLOCED_BUFFER (result, result_index, 3, result_size, PROMPT_GROWTH); result[result_index++] = c; result[result_index] = '\0'; } } #else /* !PROMPT_STRING_DECODE */ result = savestring (string); #endif /* !PROMPT_STRING_DECODE */ /* Save the delimiter stack and point `dstack' to temp space so any command substitutions in the prompt string won't result in screwing up the parser's quoting state. */ save_dstack = dstack; dstack = temp_dstack; dstack.delimiter_depth = 0; /* Perform variable and parameter expansion and command substitution on the prompt string. */ if (promptvars || posixly_correct) { last_exit_value = last_command_exit_value; last_comsub_pid = last_command_subst_pid; list = expand_prompt_string (result, Q_DOUBLE_QUOTES, 0); free (result); result = string_list (list); dispose_words (list); last_command_exit_value = last_exit_value; last_command_subst_pid = last_comsub_pid; } else { t = dequote_string (result); free (result); result = t; } dstack = save_dstack; return (result); } /************************************************ * * * ERROR HANDLING * * * ************************************************/ /* Report a syntax error, and restart the parser. Call here for fatal errors. */ int yyerror (msg) const char *msg; { report_syntax_error ((char *)NULL); reset_parser (); return (0); } static char * error_token_from_token (tok) int tok; { char *t; if (t = find_token_in_alist (tok, word_token_alist, 0)) return t; if (t = find_token_in_alist (tok, other_token_alist, 0)) return t; t = (char *)NULL; /* This stuff is dicy and needs closer inspection */ switch (current_token) { case WORD: case ASSIGNMENT_WORD: if (yylval.word) t = savestring (yylval.word->word); break; case NUMBER: t = itos (yylval.number); break; case ARITH_CMD: if (yylval.word_list) t = string_list (yylval.word_list); break; case ARITH_FOR_EXPRS: if (yylval.word_list) t = string_list_internal (yylval.word_list, " ; "); break; case COND_CMD: t = (char *)NULL; /* punt */ break; } return t; } static char * error_token_from_text () { char *msg, *t; int token_end, i; t = shell_input_line; i = shell_input_line_index; token_end = 0; msg = (char *)NULL; if (i && t[i] == '\0') i--; while (i && (whitespace (t[i]) || t[i] == '\n')) i--; if (i) token_end = i + 1; while (i && (member (t[i], " \n\t;|&") == 0)) i--; while (i != token_end && (whitespace (t[i]) || t[i] == '\n')) i++; /* Return our idea of the offending token. */ if (token_end || (i == 0 && token_end == 0)) { if (token_end) msg = substring (t, i, token_end); else /* one-character token */ { msg = (char *)xmalloc (2); msg[0] = t[i]; msg[1] = '\0'; } } return (msg); } static void print_offending_line () { char *msg; int token_end; msg = savestring (shell_input_line); token_end = strlen (msg); while (token_end && msg[token_end - 1] == '\n') msg[--token_end] = '\0'; parser_error (line_number, "`%s'", msg); free (msg); } /* Report a syntax error with line numbers, etc. Call here for recoverable errors. If you have a message to print, then place it in MESSAGE, otherwise pass NULL and this will figure out an appropriate message for you. */ static void report_syntax_error (message) char *message; { char *msg; if (message) { parser_error (line_number, "%s", message); if (interactive && EOF_Reached) EOF_Reached = 0; last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE; return; } /* If the line of input we're reading is not null, try to find the objectionable token. First, try to figure out what token the parser's complaining about by looking at current_token. */ if (current_token != 0 && EOF_Reached == 0 && (msg = error_token_from_token (current_token))) { parser_error (line_number, _("syntax error near unexpected token `%s'"), msg); free (msg); if (interactive == 0) print_offending_line (); last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE; return; } /* If looking at the current token doesn't prove fruitful, try to find the offending token by analyzing the text of the input line near the current input line index and report what we find. */ if (shell_input_line && *shell_input_line) { msg = error_token_from_text (); if (msg) { parser_error (line_number, _("syntax error near `%s'"), msg); free (msg); } /* If not interactive, print the line containing the error. */ if (interactive == 0) print_offending_line (); } else { msg = EOF_Reached ? _("syntax error: unexpected end of file") : _("syntax error"); parser_error (line_number, "%s", msg); /* When the shell is interactive, this file uses EOF_Reached only for error reporting. Other mechanisms are used to decide whether or not to exit. */ if (interactive && EOF_Reached) EOF_Reached = 0; } last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE; } /* ??? Needed function. ??? We have to be able to discard the constructs created during parsing. In the case of error, we want to return allocated objects to the memory pool. In the case of no error, we want to throw away the information about where the allocated objects live. (dispose_command () will actually free the command.) */ static void discard_parser_constructs (error_p) int error_p; { } /************************************************ * * * EOF HANDLING * * * ************************************************/ /* Do that silly `type "bye" to exit' stuff. You know, "ignoreeof". */ /* A flag denoting whether or not ignoreeof is set. */ int ignoreeof = 0; /* The number of times that we have encountered an EOF character without another character intervening. When this gets above the limit, the shell terminates. */ int eof_encountered = 0; /* The limit for eof_encountered. */ int eof_encountered_limit = 10; /* If we have EOF as the only input unit, this user wants to leave the shell. If the shell is not interactive, then just leave. Otherwise, if ignoreeof is set, and we haven't done this the required number of times in a row, print a message. */ static void handle_eof_input_unit () { if (interactive) { /* shell.c may use this to decide whether or not to write out the history, among other things. We use it only for error reporting in this file. */ if (EOF_Reached) EOF_Reached = 0; /* If the user wants to "ignore" eof, then let her do so, kind of. */ if (ignoreeof) { if (eof_encountered < eof_encountered_limit) { char *vyatta_configure_mode = getenv ( "_OFR_CONFIGURE" ); if (*vyatta_configure_mode != NULL) { fprintf (stderr, _("Use \"%s\" to leave configuration mode.\n"), login_shell ? "logout" : "exit"); } else { fprintf (stderr, _("Use \"%s\" to leave the shell.\n"), login_shell ? "logout" : "exit"); } eof_encountered++; /* Reset the parsing state. */ last_read_token = current_token = '\n'; /* Reset the prompt string to be $PS1. */ prompt_string_pointer = (char **)NULL; prompt_again (); return; } } /* In this case EOF should exit the shell. Do it now. */ reset_parser (); exit_builtin ((WORD_LIST *)NULL); } else { /* We don't write history files, etc., for non-interactive shells. */ EOF_Reached = 1; } } /************************************************ * * * STRING PARSING FUNCTIONS * * * ************************************************/ /* It's very important that these two functions treat the characters between ( and ) identically. */ static WORD_LIST parse_string_error; /* Take a string and run it through the shell parser, returning the resultant word list. Used by compound array assignment. */ WORD_LIST * parse_string_to_word_list (s, flags, whom) char *s; int flags; const char *whom; { WORD_LIST *wl; int tok, orig_current_token, orig_line_number, orig_input_terminator; int orig_line_count; int old_echo_input, old_expand_aliases; #if defined (HISTORY) int old_remember_on_history, old_history_expansion_inhibited; #endif #if defined (HISTORY) old_remember_on_history = remember_on_history; # if defined (BANG_HISTORY) old_history_expansion_inhibited = history_expansion_inhibited; # endif bash_history_disable (); #endif orig_line_number = line_number; orig_line_count = current_command_line_count; orig_input_terminator = shell_input_line_terminator; old_echo_input = echo_input_at_read; old_expand_aliases = expand_aliases; push_stream (1); last_read_token = WORD; /* WORD to allow reserved words here */ current_command_line_count = 0; echo_input_at_read = expand_aliases = 0; with_input_from_string (s, whom); wl = (WORD_LIST *)NULL; if (flags & 1) parser_state |= PST_COMPASSIGN|PST_REPARSE; while ((tok = read_token (READ)) != yacc_EOF) { if (tok == '\n' && *bash_input.location.string == '\0') break; if (tok == '\n') /* Allow newlines in compound assignments */ continue; if (tok != WORD && tok != ASSIGNMENT_WORD) { line_number = orig_line_number + line_number - 1; orig_current_token = current_token; current_token = tok; yyerror (NULL); /* does the right thing */ current_token = orig_current_token; if (wl) dispose_words (wl); wl = &parse_string_error; break; } wl = make_word_list (yylval.word, wl); } last_read_token = '\n'; pop_stream (); #if defined (HISTORY) remember_on_history = old_remember_on_history; # if defined (BANG_HISTORY) history_expansion_inhibited = old_history_expansion_inhibited; # endif /* BANG_HISTORY */ #endif /* HISTORY */ echo_input_at_read = old_echo_input; expand_aliases = old_expand_aliases; current_command_line_count = orig_line_count; shell_input_line_terminator = orig_input_terminator; if (flags & 1) parser_state &= ~(PST_COMPASSIGN|PST_REPARSE); if (wl == &parse_string_error) { last_command_exit_value = EXECUTION_FAILURE; if (interactive_shell == 0 && posixly_correct) jump_to_top_level (FORCE_EOF); else jump_to_top_level (DISCARD); } return (REVERSE_LIST (wl, WORD_LIST *)); } static char * parse_compound_assignment (retlenp) int *retlenp; { WORD_LIST *wl, *rl; int tok, orig_line_number, orig_token_size, orig_last_token, assignok; char *saved_token, *ret; saved_token = token; orig_token_size = token_buffer_size; orig_line_number = line_number; orig_last_token = last_read_token; last_read_token = WORD; /* WORD to allow reserved words here */ token = (char *)NULL; token_buffer_size = 0; assignok = parser_state&PST_ASSIGNOK; /* XXX */ wl = (WORD_LIST *)NULL; /* ( */ parser_state |= PST_COMPASSIGN; while ((tok = read_token (READ)) != ')') { if (tok == '\n') /* Allow newlines in compound assignments */ { if (SHOULD_PROMPT ()) prompt_again (); continue; } if (tok != WORD && tok != ASSIGNMENT_WORD) { current_token = tok; /* for error reporting */ if (tok == yacc_EOF) /* ( */ parser_error (orig_line_number, _("unexpected EOF while looking for matching `)'")); else yyerror(NULL); /* does the right thing */ if (wl) dispose_words (wl); wl = &parse_string_error; break; } wl = make_word_list (yylval.word, wl); } FREE (token); token = saved_token; token_buffer_size = orig_token_size; parser_state &= ~PST_COMPASSIGN; if (wl == &parse_string_error) { last_command_exit_value = EXECUTION_FAILURE; last_read_token = '\n'; /* XXX */ if (interactive_shell == 0 && posixly_correct) jump_to_top_level (FORCE_EOF); else jump_to_top_level (DISCARD); } last_read_token = orig_last_token; /* XXX - was WORD? */ if (wl) { rl = REVERSE_LIST (wl, WORD_LIST *); ret = string_list (rl); dispose_words (rl); } else ret = (char *)NULL; if (retlenp) *retlenp = (ret && *ret) ? strlen (ret) : 0; if (assignok) parser_state |= PST_ASSIGNOK; return ret; } /************************************************ * * * SAVING AND RESTORING PARTIAL PARSE STATE * * * ************************************************/ sh_parser_state_t * save_parser_state (ps) sh_parser_state_t *ps; { #if defined (ARRAY_VARS) SHELL_VAR *v; #endif if (ps == 0) ps = (sh_parser_state_t *)xmalloc (sizeof (sh_parser_state_t)); if (ps == 0) return ((sh_parser_state_t *)NULL); ps->parser_state = parser_state; ps->token_state = save_token_state (); ps->input_line_terminator = shell_input_line_terminator; ps->eof_encountered = eof_encountered; ps->current_command_line_count = current_command_line_count; #if defined (HISTORY) ps->remember_on_history = remember_on_history; # if defined (BANG_HISTORY) ps->history_expansion_inhibited = history_expansion_inhibited; # endif #endif ps->last_command_exit_value = last_command_exit_value; #if defined (ARRAY_VARS) v = find_variable ("PIPESTATUS"); if (v && array_p (v) && array_cell (v)) ps->pipestatus = array_copy (array_cell (v)); else ps->pipestatus = (ARRAY *)NULL; #endif ps->last_shell_builtin = last_shell_builtin; ps->this_shell_builtin = this_shell_builtin; ps->expand_aliases = expand_aliases; ps->echo_input_at_read = echo_input_at_read; return (ps); } void restore_parser_state (ps) sh_parser_state_t *ps; { #if defined (ARRAY_VARS) SHELL_VAR *v; #endif if (ps == 0) return; parser_state = ps->parser_state; if (ps->token_state) { restore_token_state (ps->token_state); free (ps->token_state); } shell_input_line_terminator = ps->input_line_terminator; eof_encountered = ps->eof_encountered; current_command_line_count = ps->current_command_line_count; #if defined (HISTORY) remember_on_history = ps->remember_on_history; # if defined (BANG_HISTORY) history_expansion_inhibited = ps->history_expansion_inhibited; # endif #endif last_command_exit_value = ps->last_command_exit_value; #if defined (ARRAY_VARS) v = find_variable ("PIPESTATUS"); if (v && array_p (v) && array_cell (v)) { array_dispose (array_cell (v)); var_setarray (v, ps->pipestatus); } #endif last_shell_builtin = ps->last_shell_builtin; this_shell_builtin = ps->this_shell_builtin; expand_aliases = ps->expand_aliases; echo_input_at_read = ps->echo_input_at_read; } /************************************************ * * * MULTIBYTE CHARACTER HANDLING * * * ************************************************/ #if defined (HANDLE_MULTIBYTE) static void set_line_mbstate () { int i, previ, len, c; mbstate_t mbs, prevs; size_t mbclen; if (shell_input_line == NULL) return; len = strlen (shell_input_line); /* XXX - shell_input_line_len ? */ FREE (shell_input_line_property); shell_input_line_property = (char *)xmalloc (len + 1); memset (&prevs, '\0', sizeof (mbstate_t)); for (i = previ = 0; i < len; i++) { mbs = prevs; c = shell_input_line[i]; if (c == EOF) { int j; for (j = i; j < len; j++) shell_input_line_property[j] = 1; break; } mbclen = mbrlen (shell_input_line + previ, i - previ + 1, &mbs); if (mbclen == 1 || mbclen == (size_t)-1) { mbclen = 1; previ = i + 1; } else if (mbclen == (size_t)-2) mbclen = 0; else if (mbclen > 1) { mbclen = 0; previ = i + 1; prevs = mbs; } else { /* XXX - what to do if mbrlen returns 0? (null wide character) */ int j; for (j = i; j < len; j++) shell_input_line_property[j] = 1; break; } shell_input_line_property[i] = mbclen; } } #endif /* HANDLE_MULTIBYTE */