initial import from bash_3.1dfsg.orig.tar.gz

1 files changed, 852 insertions, 0 deletions

diff --git a/make_cmd.c b/make_cmd.c
new file mode 100644
index 0000000..df20010
--- /dev/null
+++ b/make_cmd.c
@@ -0,0 +1,852 @@
+/* make_cmd.c -- Functions for making instances of the various
+   parser constructs. */
+
+/* Copyright (C) 1989-2005 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 2, 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; see the file COPYING.  If not, write to the Free Software
+Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+
+#include "config.h"
+
+#include <stdio.h>
+#include "bashtypes.h"
+#if !defined (_MINIX) && defined (HAVE_SYS_FILE_H)
+#  include <sys/file.h>
+#endif
+#include "filecntl.h"
+#include "bashansi.h"
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#include "bashintl.h"
+
+#include "syntax.h"
+#include "command.h"
+#include "general.h"
+#include "error.h"
+#include "flags.h"
+#include "make_cmd.h"
+#include "dispose_cmd.h"
+#include "variables.h"
+#include "subst.h"
+#include "input.h"
+#include "ocache.h"
+#include "externs.h"
+
+#if defined (JOB_CONTROL)
+#include "jobs.h"
+#endif
+
+#include "shmbutil.h"
+
+extern int line_number, current_command_line_count;
+extern int last_command_exit_value;
+
+/* Object caching */
+sh_obj_cache_t wdcache = {0, 0, 0};
+sh_obj_cache_t wlcache = {0, 0, 0};
+
+#define WDCACHESIZE	60
+#define WLCACHESIZE	60
+
+static COMMAND *make_for_or_select __P((enum command_type, WORD_DESC *, WORD_LIST *, COMMAND *, int));
+#if defined (ARITH_FOR_COMMAND)
+static WORD_LIST *make_arith_for_expr __P((char *));
+#endif
+static COMMAND *make_until_or_while __P((enum command_type, COMMAND *, COMMAND *));
+
+void
+cmd_init ()
+{
+  ocache_create (wdcache, WORD_DESC, WDCACHESIZE);
+  ocache_create (wlcache, WORD_LIST, WLCACHESIZE);
+}
+
+WORD_DESC *
+alloc_word_desc ()
+{
+  WORD_DESC *temp;
+
+  ocache_alloc (wdcache, WORD_DESC, temp);
+  temp->flags = 0;
+  temp->word = 0;
+  return temp;
+}
+
+WORD_DESC *
+make_bare_word (string)
+     const char *string;
+{
+  WORD_DESC *temp;
+
+  temp = alloc_word_desc ();
+
+  if (*string)
+    temp->word = savestring (string);
+  else
+    {
+      temp->word = (char *)xmalloc (1);
+      temp->word[0] = '\0';
+    }
+
+  return (temp);
+}
+
+WORD_DESC *
+make_word_flags (w, string)
+     WORD_DESC *w;
+     const char *string;
+{
+  register int i;
+  size_t slen;
+  DECLARE_MBSTATE;
+
+  i = 0;
+  slen = strlen (string);
+  while (i < slen)
+    {
+      switch (string[i])
+	{
+	case '$':
+	  w->flags |= W_HASDOLLAR;
+	  break;
+	case '\\':
+	  break;	/* continue the loop */
+	case '\'':
+	case '`':
+	case '"':
+	  w->flags |= W_QUOTED;
+	  break;
+	}
+
+      ADVANCE_CHAR (string, slen, i);
+    }
+
+  return (w);
+}
+
+WORD_DESC *
+make_word (string)
+     const char *string;
+{
+  WORD_DESC *temp;
+
+  temp = make_bare_word (string);
+  return (make_word_flags (temp, string));
+}
+
+WORD_DESC *
+make_word_from_token (token)
+     int token;
+{
+  char tokenizer[2];
+
+  tokenizer[0] = token;
+  tokenizer[1] = '\0';
+
+  return (make_word (tokenizer));
+}
+
+WORD_LIST *
+make_word_list (word, wlink)
+     WORD_DESC *word;
+     WORD_LIST *wlink;
+{
+  WORD_LIST *temp;
+
+  ocache_alloc (wlcache, WORD_LIST, temp);
+
+  temp->word = word;
+  temp->next = wlink;
+  return (temp);
+}
+
+COMMAND *
+make_command (type, pointer)
+     enum command_type type;
+     SIMPLE_COM *pointer;
+{
+  COMMAND *temp;
+
+  temp = (COMMAND *)xmalloc (sizeof (COMMAND));
+  temp->type = type;
+  temp->value.Simple = pointer;
+  temp->value.Simple->flags = temp->flags = 0;
+  temp->redirects = (REDIRECT *)NULL;
+  return (temp);
+}
+
+COMMAND *
+command_connect (com1, com2, connector)
+     COMMAND *com1, *com2;
+     int connector;
+{
+  CONNECTION *temp;
+
+  temp = (CONNECTION *)xmalloc (sizeof (CONNECTION));
+  temp->connector = connector;
+  temp->first = com1;
+  temp->second = com2;
+  return (make_command (cm_connection, (SIMPLE_COM *)temp));
+}
+
+static COMMAND *
+make_for_or_select (type, name, map_list, action, lineno)
+     enum command_type type;
+     WORD_DESC *name;
+     WORD_LIST *map_list;
+     COMMAND *action;
+     int lineno;
+{
+  FOR_COM *temp;
+
+  temp = (FOR_COM *)xmalloc (sizeof (FOR_COM));
+  temp->flags = 0;
+  temp->name = name;
+  temp->line = lineno;
+  temp->map_list = map_list;
+  temp->action = action;
+  return (make_command (type, (SIMPLE_COM *)temp));
+}
+
+COMMAND *
+make_for_command (name, map_list, action, lineno)
+     WORD_DESC *name;
+     WORD_LIST *map_list;
+     COMMAND *action;
+     int lineno;
+{
+  return (make_for_or_select (cm_for, name, map_list, action, lineno));
+}
+
+COMMAND *
+make_select_command (name, map_list, action, lineno)
+     WORD_DESC *name;
+     WORD_LIST *map_list;
+     COMMAND *action;
+     int lineno;
+{
+#if defined (SELECT_COMMAND)
+  return (make_for_or_select (cm_select, name, map_list, action, lineno));
+#else
+  last_command_exit_value = 2;
+  return ((COMMAND *)NULL);
+#endif
+}
+
+#if defined (ARITH_FOR_COMMAND)
+static WORD_LIST *
+make_arith_for_expr (s)
+     char *s;
+{
+  WORD_LIST *result;
+  WORD_DESC *wd;
+
+  if (s == 0 || *s == '\0')
+    return ((WORD_LIST *)NULL);
+  wd = make_word (s);
+  wd->flags |= W_NOGLOB|W_NOSPLIT|W_QUOTED|W_DQUOTE;	/* no word splitting or globbing */
+  result = make_word_list (wd, (WORD_LIST *)NULL);
+  return result;
+}
+#endif
+
+/* Note that this function calls dispose_words on EXPRS, since it doesn't
+   use the word list directly.  We free it here rather than at the caller
+   because no other function in this file requires that the caller free
+   any arguments. */
+COMMAND *
+make_arith_for_command (exprs, action, lineno)
+     WORD_LIST *exprs;
+     COMMAND *action;
+     int lineno;
+{
+#if defined (ARITH_FOR_COMMAND)
+  ARITH_FOR_COM *temp;
+  WORD_LIST *init, *test, *step;
+  char *s, *t, *start;
+  int nsemi;
+
+  init = test = step = (WORD_LIST *)NULL;
+  /* Parse the string into the three component sub-expressions. */
+  start = t = s = exprs->word->word;
+  for (nsemi = 0; ;)
+    {
+      /* skip whitespace at the start of each sub-expression. */
+      while (whitespace (*s))
+	s++;
+      start = s;
+      /* skip to the semicolon or EOS */
+      while (*s && *s != ';')
+	s++;
+
+      t = (s > start) ? substring (start, 0, s - start) : (char *)NULL;
+
+      nsemi++;
+      switch (nsemi)
+	{
+	case 1:
+	  init = make_arith_for_expr (t);
+	  break;
+	case 2:
+	  test = make_arith_for_expr (t);
+	  break;
+	case 3:
+	  step = make_arith_for_expr (t);
+	  break;
+	}
+
+      FREE (t);
+      if (*s == '\0')
+	break;
+      s++;	/* skip over semicolon */
+    }
+
+  if (nsemi != 3)
+    {
+      if (nsemi < 3)
+	parser_error (lineno, _("syntax error: arithmetic expression required"));
+      else
+	parser_error (lineno, _("syntax error: `;' unexpected"));
+      parser_error (lineno, _("syntax error: `((%s))'"), exprs->word->word);
+      last_command_exit_value = 2;
+      return ((COMMAND *)NULL);
+    }
+
+  temp = (ARITH_FOR_COM *)xmalloc (sizeof (ARITH_FOR_COM));
+  temp->flags = 0;
+  temp->line = lineno;
+  temp->init = init ? init : make_arith_for_expr ("1");
+  temp->test = test ? test : make_arith_for_expr ("1");
+  temp->step = step ? step : make_arith_for_expr ("1");
+  temp->action = action;
+
+  dispose_words (exprs);
+  return (make_command (cm_arith_for, (SIMPLE_COM *)temp));
+#else
+  dispose_words (exprs);
+  last_command_exit_value = 2;
+  return ((COMMAND *)NULL);
+#endif /* ARITH_FOR_COMMAND */
+}
+
+COMMAND *
+make_group_command (command)
+     COMMAND *command;
+{
+  GROUP_COM *temp;
+
+  temp = (GROUP_COM *)xmalloc (sizeof (GROUP_COM));
+  temp->command = command;
+  return (make_command (cm_group, (SIMPLE_COM *)temp));
+}
+
+COMMAND *
+make_case_command (word, clauses, lineno)
+     WORD_DESC *word;
+     PATTERN_LIST *clauses;
+     int lineno;
+{
+  CASE_COM *temp;
+
+  temp = (CASE_COM *)xmalloc (sizeof (CASE_COM));
+  temp->flags = 0;
+  temp->line = lineno;
+  temp->word = word;
+  temp->clauses = REVERSE_LIST (clauses, PATTERN_LIST *);
+  return (make_command (cm_case, (SIMPLE_COM *)temp));
+}
+
+PATTERN_LIST *
+make_pattern_list (patterns, action)
+     WORD_LIST *patterns;
+     COMMAND *action;
+{
+  PATTERN_LIST *temp;
+
+  temp = (PATTERN_LIST *)xmalloc (sizeof (PATTERN_LIST));
+  temp->patterns = REVERSE_LIST (patterns, WORD_LIST *);
+  temp->action = action;
+  temp->next = NULL;
+  temp->flags = 0;
+  return (temp);
+}
+
+COMMAND *
+make_if_command (test, true_case, false_case)
+     COMMAND *test, *true_case, *false_case;
+{
+  IF_COM *temp;
+
+  temp = (IF_COM *)xmalloc (sizeof (IF_COM));
+  temp->flags = 0;
+  temp->test = test;
+  temp->true_case = true_case;
+  temp->false_case = false_case;
+  return (make_command (cm_if, (SIMPLE_COM *)temp));
+}
+
+static COMMAND *
+make_until_or_while (which, test, action)
+     enum command_type which;
+     COMMAND *test, *action;
+{
+  WHILE_COM *temp;
+
+  temp = (WHILE_COM *)xmalloc (sizeof (WHILE_COM));
+  temp->flags = 0;
+  temp->test = test;
+  temp->action = action;
+  return (make_command (which, (SIMPLE_COM *)temp));
+}
+
+COMMAND *
+make_while_command (test, action)
+     COMMAND *test, *action;
+{
+  return (make_until_or_while (cm_while, test, action));
+}
+
+COMMAND *
+make_until_command (test, action)
+     COMMAND *test, *action;
+{
+  return (make_until_or_while (cm_until, test, action));
+}
+
+COMMAND *
+make_arith_command (exp)
+     WORD_LIST *exp;
+{
+#if defined (DPAREN_ARITHMETIC)
+  COMMAND *command;
+  ARITH_COM *temp;
+
+  command = (COMMAND *)xmalloc (sizeof (COMMAND));
+  command->value.Arith = temp = (ARITH_COM *)xmalloc (sizeof (ARITH_COM));
+
+  temp->flags = 0;
+  temp->line = line_number;
+  temp->exp = exp;
+
+  command->type = cm_arith;
+  command->redirects = (REDIRECT *)NULL;
+  command->flags = 0;
+
+  return (command);
+#else
+  last_command_exit_value = 2;
+  return ((COMMAND *)NULL);
+#endif
+}
+
+#if defined (COND_COMMAND)
+struct cond_com *
+make_cond_node (type, op, left, right)
+     int type;
+     WORD_DESC *op;
+     struct cond_com *left, *right;
+{
+  COND_COM *temp;
+
+  temp = (COND_COM *)xmalloc (sizeof (COND_COM));
+  temp->flags = 0;
+  temp->line = line_number;
+  temp->type = type;
+  temp->op = op;
+  temp->left = left;
+  temp->right = right;
+
+  return (temp);
+}
+#endif
+
+COMMAND *
+make_cond_command (cond_node)
+     COND_COM *cond_node;
+{
+#if defined (COND_COMMAND)
+  COMMAND *command;
+
+  command = (COMMAND *)xmalloc (sizeof (COMMAND));
+  command->value.Cond = cond_node;
+
+  command->type = cm_cond;
+  command->redirects = (REDIRECT *)NULL;
+  command->flags = 0;
+  command->line = cond_node ? cond_node->line : 0;
+
+  return (command);
+#else
+  last_command_exit_value = 2;
+  return ((COMMAND *)NULL);
+#endif
+}
+
+COMMAND *
+make_bare_simple_command ()
+{
+  COMMAND *command;
+  SIMPLE_COM *temp;
+
+  command = (COMMAND *)xmalloc (sizeof (COMMAND));
+  command->value.Simple = temp = (SIMPLE_COM *)xmalloc (sizeof (SIMPLE_COM));
+
+  temp->flags = 0;
+  temp->line = line_number;
+  temp->words = (WORD_LIST *)NULL;
+  temp->redirects = (REDIRECT *)NULL;
+
+  command->type = cm_simple;
+  command->redirects = (REDIRECT *)NULL;
+  command->flags = 0;
+
+  return (command);
+}
+
+/* Return a command which is the connection of the word or redirection
+   in ELEMENT, and the command * or NULL in COMMAND. */
+COMMAND *
+make_simple_command (element, command)
+     ELEMENT element;
+     COMMAND *command;
+{
+  /* If we are starting from scratch, then make the initial command
+     structure.  Also note that we have to fill in all the slots, since
+     malloc doesn't return zeroed space. */
+  if (!command)
+    command = make_bare_simple_command ();
+
+  if (element.word)
+    command->value.Simple->words = make_word_list (element.word, command->value.Simple->words);
+  else if (element.redirect)
+    {
+      REDIRECT *r = element.redirect;
+      /* Due to the way <> is implemented, there may be more than a single
+	 redirection in element.redirect.  We just follow the chain as far
+	 as it goes, and hook onto the end. */
+      while (r->next)
+	r = r->next;
+      r->next = command->value.Simple->redirects;
+      command->value.Simple->redirects = element.redirect;
+    }
+  return (command);
+}
+
+/* Because we are Bourne compatible, we read the input for this
+   << or <<- redirection now, from wherever input is coming from.
+   We store the input read into a WORD_DESC.  Replace the text of
+   the redirectee.word with the new input text.  If <<- is on,
+   then remove leading TABS from each line. */
+void
+make_here_document (temp)
+     REDIRECT *temp;
+{
+  int kill_leading, redir_len;
+  char *redir_word, *document, *full_line;
+  int document_index, document_size, delim_unquoted;
+
+  if (temp->instruction != r_deblank_reading_until &&
+      temp->instruction != r_reading_until)
+    {
+      internal_error (_("make_here_document: bad instruction type %d"), temp->instruction);
+      return;
+    }
+
+  kill_leading = temp->instruction == r_deblank_reading_until;
+
+  document = (char *)NULL;
+  document_index = document_size = 0;
+
+  /* Quote removal is the only expansion performed on the delimiter
+     for here documents, making it an extremely special case. */
+  redir_word = string_quote_removal (temp->redirectee.filename->word, 0);
+
+  /* redirection_expand will return NULL if the expansion results in
+     multiple words or no words.  Check for that here, and just abort
+     this here document if it does. */
+  if (redir_word)
+    redir_len = strlen (redir_word);
+  else
+    {
+      temp->here_doc_eof = (char *)xmalloc (1);
+      temp->here_doc_eof[0] = '\0';
+      goto document_done;
+    }
+
+  free (temp->redirectee.filename->word);
+  temp->here_doc_eof = redir_word;
+
+  /* Read lines from wherever lines are coming from.
+     For each line read, if kill_leading, then kill the
+     leading tab characters.
+     If the line matches redir_word exactly, then we have
+     manufactured the document.  Otherwise, add the line to the
+     list of lines in the document. */
+
+  /* If the here-document delimiter was quoted, the lines should
+     be read verbatim from the input.  If it was not quoted, we
+     need to perform backslash-quoted newline removal. */
+  delim_unquoted = (temp->redirectee.filename->flags & W_QUOTED) == 0;
+  while (full_line = read_secondary_line (delim_unquoted))
+    {
+      register char *line;
+      int len;
+
+      line = full_line;
+      line_number++;
+
+      if (kill_leading && *line)
+	{
+	  /* Hack:  To be compatible with some Bourne shells, we
+	     check the word before stripping the whitespace.  This
+	     is a hack, though. */
+	  if (STREQN (line, redir_word, redir_len) && line[redir_len] == '\n')
+	    goto document_done;
+
+	  while (*line == '\t')
+	    line++;
+	}
+
+      if (*line == 0)
+	continue;
+
+      if (STREQN (line, redir_word, redir_len) && line[redir_len] == '\n')
+	goto document_done;
+
+      len = strlen (line);
+      if (len + document_index >= document_size)
+	{
+	  document_size = document_size ? 2 * (document_size + len) : len + 2;
+	  document = (char *)xrealloc (document, document_size);
+	}
+
+      /* len is guaranteed to be > 0 because of the check for line
+	 being an empty string before the call to strlen. */
+      FASTCOPY (line, document + document_index, len);
+      document_index += len;
+    }
+
+document_done:
+  if (document)
+    document[document_index] = '\0';
+  else
+    {
+      document = (char *)xmalloc (1);
+      document[0] = '\0';
+    }
+  temp->redirectee.filename->word = document;
+}
+
+/* Generate a REDIRECT from SOURCE, DEST, and INSTRUCTION.
+   INSTRUCTION is the instruction type, SOURCE is a file descriptor,
+   and DEST is a file descriptor or a WORD_DESC *. */
+REDIRECT *
+make_redirection (source, instruction, dest_and_filename)
+     int source;
+     enum r_instruction instruction;
+     REDIRECTEE dest_and_filename;
+{
+  REDIRECT *temp;
+  WORD_DESC *w;
+  int wlen;
+  intmax_t lfd;
+
+  temp = (REDIRECT *)xmalloc (sizeof (REDIRECT));
+
+  /* First do the common cases. */
+  temp->redirector = source;
+  temp->redirectee = dest_and_filename;
+  temp->instruction = instruction;
+  temp->flags = 0;
+  temp->next = (REDIRECT *)NULL;
+
+  switch (instruction)
+    {
+
+    case r_output_direction:		/* >foo */
+    case r_output_force:		/* >| foo */
+    case r_err_and_out:			/* command &>filename */
+      temp->flags = O_TRUNC | O_WRONLY | O_CREAT;
+      break;
+
+    case r_appending_to:		/* >>foo */
+      temp->flags = O_APPEND | O_WRONLY | O_CREAT;
+      break;
+
+    case r_input_direction:		/* <foo */
+    case r_inputa_direction:		/* foo & makes this. */
+      temp->flags = O_RDONLY;
+      break;
+
+    case r_input_output:		/* <>foo */
+      temp->flags = O_RDWR | O_CREAT;
+      break;
+
+    case r_deblank_reading_until: 	/* <<-foo */
+    case r_reading_until:		/* << foo */
+    case r_reading_string:		/* <<< foo */
+    case r_close_this:			/* <&- */
+    case r_duplicating_input:		/* 1<&2 */
+    case r_duplicating_output:		/* 1>&2 */
+      break;
+
+    /* the parser doesn't pass these. */
+    case r_move_input:			/* 1<&2- */
+    case r_move_output:			/* 1>&2- */
+    case r_move_input_word:		/* 1<&$foo- */
+    case r_move_output_word:		/* 1>&$foo- */
+      break;
+
+    /* The way the lexer works we have to do this here. */
+    case r_duplicating_input_word:	/* 1<&$foo */
+    case r_duplicating_output_word:	/* 1>&$foo */
+      w = dest_and_filename.filename;
+      wlen = strlen (w->word) - 1;
+      if (w->word[wlen] == '-')		/* Yuck */
+        {
+          w->word[wlen] = '\0';
+	  if (all_digits (w->word) && legal_number (w->word, &lfd) && lfd == (int)lfd)
+	    {
+	      dispose_word (w);
+	      temp->instruction = (instruction == r_duplicating_input_word) ? r_move_input : r_move_output;
+	      temp->redirectee.dest = lfd;
+	    }
+	  else
+	    temp->instruction = (instruction == r_duplicating_input_word) ? r_move_input_word : r_move_output_word;
+        }
+          
+      break;
+
+    default:
+      programming_error (_("make_redirection: redirection instruction `%d' out of range"), instruction);
+      abort ();
+      break;
+    }
+  return (temp);
+}
+
+COMMAND *
+make_function_def (name, command, lineno, lstart)
+     WORD_DESC *name;
+     COMMAND *command;
+     int lineno, lstart;
+{
+  FUNCTION_DEF *temp;
+#if defined (ARRAY_VARS)
+  SHELL_VAR *bash_source_v;
+  ARRAY *bash_source_a;
+  char *t;
+#endif
+
+  temp = (FUNCTION_DEF *)xmalloc (sizeof (FUNCTION_DEF));
+  temp->command = command;
+  temp->name = name;
+  temp->line = lineno;
+  temp->flags = 0;
+  command->line = lstart;
+
+  /* Information used primarily for debugging. */
+  temp->source_file = 0;
+#if defined (ARRAY_VARS)
+  GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a);
+  if (bash_source_a && array_num_elements (bash_source_a) > 0)
+    temp->source_file = array_reference (bash_source_a, 0);
+#endif
+  bind_function_def (name->word, temp);
+
+  temp->source_file = 0;
+  return (make_command (cm_function_def, (SIMPLE_COM *)temp));
+}
+
+COMMAND *
+make_subshell_command (command)
+     COMMAND *command;
+{
+  SUBSHELL_COM *temp;
+
+  temp = (SUBSHELL_COM *)xmalloc (sizeof (SUBSHELL_COM));
+  temp->command = command;
+  temp->flags = CMD_WANT_SUBSHELL;
+  return (make_command (cm_subshell, (SIMPLE_COM *)temp));
+}
+
+/* Reverse the word list and redirection list in the simple command
+   has just been parsed.  It seems simpler to do this here the one
+   time then by any other method that I can think of. */
+COMMAND *
+clean_simple_command (command)
+     COMMAND *command;
+{
+  if (command->type != cm_simple)
+    command_error ("clean_simple_command", CMDERR_BADTYPE, command->type, 0);
+  else
+    {
+      command->value.Simple->words =
+	REVERSE_LIST (command->value.Simple->words, WORD_LIST *);
+      command->value.Simple->redirects =
+	REVERSE_LIST (command->value.Simple->redirects, REDIRECT *);
+    }
+
+  return (command);
+}
+
+/* The Yacc grammar productions have a problem, in that they take a
+   list followed by an ampersand (`&') and do a simple command connection,
+   making the entire list effectively asynchronous, instead of just
+   the last command.  This means that when the list is executed, all
+   the commands have stdin set to /dev/null when job control is not
+   active, instead of just the last.  This is wrong, and needs fixing
+   up.  This function takes the `&' and applies it to the last command
+   in the list.  This is done only for lists connected by `;'; it makes
+   `;' bind `tighter' than `&'. */
+COMMAND *
+connect_async_list (command, command2, connector)
+     COMMAND *command, *command2;
+     int connector;
+{
+  COMMAND *t, *t1, *t2;
+
+  t1 = command;
+  t = command->value.Connection->second;
+
+  if (!t || (command->flags & CMD_WANT_SUBSHELL) ||
+      command->value.Connection->connector != ';')
+    {
+      t = command_connect (command, command2, connector);
+      return t;
+    }
+
+  /* This is just defensive programming.  The Yacc precedence rules
+     will generally hand this function a command where t points directly
+     to the command we want (e.g. given a ; b ; c ; d &, t1 will point
+     to the `a ; b ; c' list and t will be the `d').  We only want to do
+     this if the list is not being executed as a unit in the background
+     with `( ... )', so we have to check for CMD_WANT_SUBSHELL.  That's
+     the only way to tell. */
+  while (((t->flags & CMD_WANT_SUBSHELL) == 0) && t->type == cm_connection &&
+	 t->value.Connection->connector == ';')
+    {
+      t1 = t;
+      t = t->value.Connection->second;
+    }
+  /* Now we have t pointing to the last command in the list, and
+     t1->value.Connection->second == t. */
+  t2 = command_connect (t, command2, connector);
+  t1->value.Connection->second = t2;
+  return command;
+}