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Diffstat (limited to 'test.c')
| -rw-r--r-- | test.c | 924 |
1 files changed, 924 insertions, 0 deletions
@@ -0,0 +1,924 @@ +/* GNU test program (ksb and mjb) */ + +/* Modified to run with the GNU shell Apr 25, 1988 by bfox. */ + +/* Copyright (C) 1987-2005 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. */ + +/* Define PATTERN_MATCHING to get the csh-like =~ and !~ pattern-matching + binary operators. */ +/* #define PATTERN_MATCHING */ + +#if defined (HAVE_CONFIG_H) +# include <config.h> +#endif + +#include <stdio.h> + +#include "bashtypes.h" + +#if !defined (HAVE_LIMITS_H) +# include <sys/param.h> +#endif + +#if defined (HAVE_UNISTD_H) +# include <unistd.h> +#endif + +#include <errno.h> +#if !defined (errno) +extern int errno; +#endif /* !errno */ + +#if !defined (_POSIX_VERSION) && defined (HAVE_SYS_FILE_H) +# include <sys/file.h> +#endif /* !_POSIX_VERSION */ +#include "posixstat.h" +#include "filecntl.h" + +#include "bashintl.h" + +#include "shell.h" +#include "pathexp.h" +#include "test.h" +#include "builtins/common.h" + +#include <glob/strmatch.h> + +#if !defined (STRLEN) +# define STRLEN(s) ((s)[0] ? ((s)[1] ? ((s)[2] ? strlen(s) : 2) : 1) : 0) +#endif + +#if !defined (STREQ) +# define STREQ(a, b) ((a)[0] == (b)[0] && strcmp (a, b) == 0) +#endif /* !STREQ */ + +#if !defined (R_OK) +#define R_OK 4 +#define W_OK 2 +#define X_OK 1 +#define F_OK 0 +#endif /* R_OK */ + +#define EQ 0 +#define NE 1 +#define LT 2 +#define GT 3 +#define LE 4 +#define GE 5 + +#define NT 0 +#define OT 1 +#define EF 2 + +/* The following few defines control the truth and false output of each stage. + TRUE and FALSE are what we use to compute the final output value. + SHELL_BOOLEAN is the form which returns truth or falseness in shell terms. + Default is TRUE = 1, FALSE = 0, SHELL_BOOLEAN = (!value). */ +#define TRUE 1 +#define FALSE 0 +#define SHELL_BOOLEAN(value) (!(value)) + +#define TEST_ERREXIT_STATUS 2 + +static procenv_t test_exit_buf; +static int test_error_return; +#define test_exit(val) \ + do { test_error_return = val; longjmp (test_exit_buf, 1); } while (0) + +/* We have to use access(2) for machines running AFS, because it's + not a Unix file system. This may produce incorrect answers for + non-AFS files. I hate AFS. */ +#if defined (AFS) +# define EACCESS(path, mode) access(path, mode) +#else +# define EACCESS(path, mode) test_eaccess(path, mode) +#endif /* AFS */ + +static int pos; /* The offset of the current argument in ARGV. */ +static int argc; /* The number of arguments present in ARGV. */ +static char **argv; /* The argument list. */ +static int noeval; + +static void test_syntax_error __P((char *, char *)) __attribute__((__noreturn__)); +static void beyond __P((void)) __attribute__((__noreturn__)); +static void integer_expected_error __P((char *)) __attribute__((__noreturn__)); + +static int test_stat __P((char *, struct stat *)); + +static int unary_operator __P((void)); +static int binary_operator __P((void)); +static int two_arguments __P((void)); +static int three_arguments __P((void)); +static int posixtest __P((void)); + +static int expr __P((void)); +static int term __P((void)); +static int and __P((void)); +static int or __P((void)); + +static int filecomp __P((char *, char *, int)); +static int arithcomp __P((char *, char *, int, int)); +static int patcomp __P((char *, char *, int)); + +static void +test_syntax_error (format, arg) + char *format, *arg; +{ + builtin_error (format, arg); + test_exit (TEST_ERREXIT_STATUS); +} + +/* + * beyond - call when we're beyond the end of the argument list (an + * error condition) + */ +static void +beyond () +{ + test_syntax_error (_("argument expected"), (char *)NULL); +} + +/* Syntax error for when an integer argument was expected, but + something else was found. */ +static void +integer_expected_error (pch) + char *pch; +{ + test_syntax_error (_("%s: integer expression expected"), pch); +} + +/* A wrapper for stat () which disallows pathnames that are empty strings + and handles /dev/fd emulation on systems that don't have it. */ +static int +test_stat (path, finfo) + char *path; + struct stat *finfo; +{ + if (*path == '\0') + { + errno = ENOENT; + return (-1); + } + if (path[0] == '/' && path[1] == 'd' && strncmp (path, "/dev/fd/", 8) == 0) + { +#if !defined (HAVE_DEV_FD) + intmax_t fd; + int r; + + if (legal_number (path + 8, &fd) && fd == (int)fd) + { + r = fstat ((int)fd, finfo); + if (r == 0 || errno != EBADF) + return (r); + } + errno = ENOENT; + return (-1); +#else + /* If HAVE_DEV_FD is defined, DEV_FD_PREFIX is defined also, and has a + trailing slash. Make sure /dev/fd/xx really uses DEV_FD_PREFIX/xx. + On most systems, with the notable exception of linux, this is + effectively a no-op. */ + char pbuf[32]; + strcpy (pbuf, DEV_FD_PREFIX); + strcat (pbuf, path + 8); + return (stat (pbuf, finfo)); +#endif /* !HAVE_DEV_FD */ + } +#if !defined (HAVE_DEV_STDIN) + else if (STREQN (path, "/dev/std", 8)) + { + if (STREQ (path+8, "in")) + return (fstat (0, finfo)); + else if (STREQ (path+8, "out")) + return (fstat (1, finfo)); + else if (STREQ (path+8, "err")) + return (fstat (2, finfo)); + else + return (stat (path, finfo)); + } +#endif /* !HAVE_DEV_STDIN */ + return (stat (path, finfo)); +} + +/* Do the same thing access(2) does, but use the effective uid and gid, + and don't make the mistake of telling root that any file is + executable. */ +int +test_eaccess (path, mode) + char *path; + int mode; +{ + struct stat st; + + if (test_stat (path, &st) < 0) + return (-1); + + if (current_user.euid == 0) + { + /* Root can read or write any file. */ + if (mode != X_OK) + return (0); + + /* Root can execute any file that has any one of the execute + bits set. */ + if (st.st_mode & S_IXUGO) + return (0); + } + + if (st.st_uid == current_user.euid) /* owner */ + mode <<= 6; + else if (group_member (st.st_gid)) + mode <<= 3; + + if (st.st_mode & mode) + return (0); + + errno = EACCES; + return (-1); +} + +/* Increment our position in the argument list. Check that we're not + past the end of the argument list. This check is supressed if the + argument is FALSE. Made a macro for efficiency. */ +#define advance(f) do { ++pos; if (f && pos >= argc) beyond (); } while (0) +#define unary_advance() do { advance (1); ++pos; } while (0) + +/* + * expr: + * or + */ +static int +expr () +{ + if (pos >= argc) + beyond (); + + return (FALSE ^ or ()); /* Same with this. */ +} + +/* + * or: + * and + * and '-o' or + */ +static int +or () +{ + int value, v2; + + value = and (); + if (pos < argc && argv[pos][0] == '-' && argv[pos][1] == 'o' && !argv[pos][2]) + { + advance (0); + v2 = or (); + return (value || v2); + } + + return (value); +} + +/* + * and: + * term + * term '-a' and + */ +static int +and () +{ + int value, v2; + + value = term (); + if (pos < argc && argv[pos][0] == '-' && argv[pos][1] == 'a' && !argv[pos][2]) + { + advance (0); + v2 = and (); + return (value && v2); + } + return (value); +} + +/* + * term - parse a term and return 1 or 0 depending on whether the term + * evaluates to true or false, respectively. + * + * term ::= + * '-'('a'|'b'|'c'|'d'|'e'|'f'|'g'|'h'|'k'|'p'|'r'|'s'|'u'|'w'|'x') filename + * '-'('G'|'L'|'O'|'S'|'N') filename + * '-t' [int] + * '-'('z'|'n') string + * '-o' option + * string + * string ('!='|'='|'==') string + * <int> '-'(eq|ne|le|lt|ge|gt) <int> + * file '-'(nt|ot|ef) file + * '(' <expr> ')' + * int ::= + * positive and negative integers + */ +static int +term () +{ + int value; + + if (pos >= argc) + beyond (); + + /* Deal with leading `not's. */ + if (argv[pos][0] == '!' && argv[pos][1] == '\0') + { + value = 0; + while (pos < argc && argv[pos][0] == '!' && argv[pos][1] == '\0') + { + advance (1); + value = 1 - value; + } + + return (value ? !term() : term()); + } + + /* A paren-bracketed argument. */ + if (argv[pos][0] == '(' && argv[pos][1] == '\0') /* ) */ + { + advance (1); + value = expr (); + if (argv[pos] == 0) /* ( */ + test_syntax_error (_("`)' expected"), (char *)NULL); + else if (argv[pos][0] != ')' || argv[pos][1]) /* ( */ + test_syntax_error (_("`)' expected, found %s"), argv[pos]); + advance (0); + return (value); + } + + /* are there enough arguments left that this could be dyadic? */ + if ((pos + 3 <= argc) && test_binop (argv[pos + 1])) + value = binary_operator (); + + /* Might be a switch type argument */ + else if (argv[pos][0] == '-' && argv[pos][2] == '\0') + { + if (test_unop (argv[pos])) + value = unary_operator (); + else + test_syntax_error (_("%s: unary operator expected"), argv[pos]); + } + else + { + value = argv[pos][0] != '\0'; + advance (0); + } + + return (value); +} + +static int +filecomp (s, t, op) + char *s, *t; + int op; +{ + struct stat st1, st2; + int r1, r2; + + if ((r1 = test_stat (s, &st1)) < 0) + { + if (op == EF) + return (FALSE); + } + if ((r2 = test_stat (t, &st2)) < 0) + { + if (op == EF) + return (FALSE); + } + + switch (op) + { + case OT: return (r1 < r2 || (r2 == 0 && st1.st_mtime < st2.st_mtime)); + case NT: return (r1 > r2 || (r1 == 0 && st1.st_mtime > st2.st_mtime)); + case EF: return ((st1.st_dev == st2.st_dev) && (st1.st_ino == st2.st_ino)); + } + return (FALSE); +} + +static int +arithcomp (s, t, op, flags) + char *s, *t; + int op, flags; +{ + intmax_t l, r; + int expok; + + if (flags & TEST_ARITHEXP) + { + l = evalexp (s, &expok); + if (expok == 0) + return (FALSE); /* should probably longjmp here */ + r = evalexp (t, &expok); + if (expok == 0) + return (FALSE); /* ditto */ + } + else + { + if (legal_number (s, &l) == 0) + integer_expected_error (s); + if (legal_number (t, &r) == 0) + integer_expected_error (t); + } + + switch (op) + { + case EQ: return (l == r); + case NE: return (l != r); + case LT: return (l < r); + case GT: return (l > r); + case LE: return (l <= r); + case GE: return (l >= r); + } + + return (FALSE); +} + +static int +patcomp (string, pat, op) + char *string, *pat; + int op; +{ + int m; + + m = strmatch (pat, string, FNMATCH_EXTFLAG|FNMATCH_IGNCASE); + return ((op == EQ) ? (m == 0) : (m != 0)); +} + +int +binary_test (op, arg1, arg2, flags) + char *op, *arg1, *arg2; + int flags; +{ + int patmatch; + + patmatch = (flags & TEST_PATMATCH); + + if (op[0] == '=' && (op[1] == '\0' || (op[1] == '=' && op[2] == '\0'))) + return (patmatch ? patcomp (arg1, arg2, EQ) : STREQ (arg1, arg2)); + + else if ((op[0] == '>' || op[0] == '<') && op[1] == '\0') + return ((op[0] == '>') ? (strcmp (arg1, arg2) > 0) : (strcmp (arg1, arg2) < 0)); + + else if (op[0] == '!' && op[1] == '=' && op[2] == '\0') + return (patmatch ? patcomp (arg1, arg2, NE) : (STREQ (arg1, arg2) == 0)); + + else if (op[2] == 't') + { + switch (op[1]) + { + case 'n': return (filecomp (arg1, arg2, NT)); /* -nt */ + case 'o': return (filecomp (arg1, arg2, OT)); /* -ot */ + case 'l': return (arithcomp (arg1, arg2, LT, flags)); /* -lt */ + case 'g': return (arithcomp (arg1, arg2, GT, flags)); /* -gt */ + } + } + else if (op[1] == 'e') + { + switch (op[2]) + { + case 'f': return (filecomp (arg1, arg2, EF)); /* -ef */ + case 'q': return (arithcomp (arg1, arg2, EQ, flags)); /* -eq */ + } + } + else if (op[2] == 'e') + { + switch (op[1]) + { + case 'n': return (arithcomp (arg1, arg2, NE, flags)); /* -ne */ + case 'g': return (arithcomp (arg1, arg2, GE, flags)); /* -ge */ + case 'l': return (arithcomp (arg1, arg2, LE, flags)); /* -le */ + } + } + + return (FALSE); /* should never get here */ +} + + +static int +binary_operator () +{ + int value; + char *w; + + w = argv[pos + 1]; + if ((w[0] == '=' && (w[1] == '\0' || (w[1] == '=' && w[2] == '\0'))) || /* =, == */ + ((w[0] == '>' || w[0] == '<') && w[1] == '\0') || /* <, > */ + (w[0] == '!' && w[1] == '=' && w[2] == '\0')) /* != */ + { + value = binary_test (w, argv[pos], argv[pos + 2], 0); + pos += 3; + return (value); + } + +#if defined (PATTERN_MATCHING) + if ((w[0] == '=' || w[0] == '!') && w[1] == '~' && w[2] == '\0') + { + value = patcomp (argv[pos], argv[pos + 2], w[0] == '=' ? EQ : NE); + pos += 3; + return (value); + } +#endif + + if ((w[0] != '-' || w[3] != '\0') || test_binop (w) == 0) + { + test_syntax_error (_("%s: binary operator expected"), w); + /* NOTREACHED */ + return (FALSE); + } + + value = binary_test (w, argv[pos], argv[pos + 2], 0); + pos += 3; + return value; +} + +static int +unary_operator () +{ + char *op; + intmax_t r; + + op = argv[pos]; + if (test_unop (op) == 0) + return (FALSE); + + /* the only tricky case is `-t', which may or may not take an argument. */ + if (op[1] == 't') + { + advance (0); + if (pos < argc) + { + if (legal_number (argv[pos], &r)) + { + advance (0); + return (unary_test (op, argv[pos - 1])); + } + else + return (FALSE); + } + else + return (unary_test (op, "1")); + } + + /* All of the unary operators take an argument, so we first call + unary_advance (), which checks to make sure that there is an + argument, and then advances pos right past it. This means that + pos - 1 is the location of the argument. */ + unary_advance (); + return (unary_test (op, argv[pos - 1])); +} + +int +unary_test (op, arg) + char *op, *arg; +{ + intmax_t r; + struct stat stat_buf; + + switch (op[1]) + { + case 'a': /* file exists in the file system? */ + case 'e': + return (test_stat (arg, &stat_buf) == 0); + + case 'r': /* file is readable? */ + return (EACCESS (arg, R_OK) == 0); + + case 'w': /* File is writeable? */ + return (EACCESS (arg, W_OK) == 0); + + case 'x': /* File is executable? */ + return (EACCESS (arg, X_OK) == 0); + + case 'O': /* File is owned by you? */ + return (test_stat (arg, &stat_buf) == 0 && + (uid_t) current_user.euid == (uid_t) stat_buf.st_uid); + + case 'G': /* File is owned by your group? */ + return (test_stat (arg, &stat_buf) == 0 && + (gid_t) current_user.egid == (gid_t) stat_buf.st_gid); + + case 'N': + return (test_stat (arg, &stat_buf) == 0 && + stat_buf.st_atime <= stat_buf.st_mtime); + + case 'f': /* File is a file? */ + if (test_stat (arg, &stat_buf) < 0) + return (FALSE); + + /* -f is true if the given file exists and is a regular file. */ +#if defined (S_IFMT) + return (S_ISREG (stat_buf.st_mode) || (stat_buf.st_mode & S_IFMT) == 0); +#else + return (S_ISREG (stat_buf.st_mode)); +#endif /* !S_IFMT */ + + case 'd': /* File is a directory? */ + return (test_stat (arg, &stat_buf) == 0 && (S_ISDIR (stat_buf.st_mode))); + + case 's': /* File has something in it? */ + return (test_stat (arg, &stat_buf) == 0 && stat_buf.st_size > (off_t) 0); + + case 'S': /* File is a socket? */ +#if !defined (S_ISSOCK) + return (FALSE); +#else + return (test_stat (arg, &stat_buf) == 0 && S_ISSOCK (stat_buf.st_mode)); +#endif /* S_ISSOCK */ + + case 'c': /* File is character special? */ + return (test_stat (arg, &stat_buf) == 0 && S_ISCHR (stat_buf.st_mode)); + + case 'b': /* File is block special? */ + return (test_stat (arg, &stat_buf) == 0 && S_ISBLK (stat_buf.st_mode)); + + case 'p': /* File is a named pipe? */ +#ifndef S_ISFIFO + return (FALSE); +#else + return (test_stat (arg, &stat_buf) == 0 && S_ISFIFO (stat_buf.st_mode)); +#endif /* S_ISFIFO */ + + case 'L': /* Same as -h */ + case 'h': /* File is a symbolic link? */ +#if !defined (S_ISLNK) || !defined (HAVE_LSTAT) + return (FALSE); +#else + return ((arg[0] != '\0') && + (lstat (arg, &stat_buf) == 0) && S_ISLNK (stat_buf.st_mode)); +#endif /* S_IFLNK && HAVE_LSTAT */ + + case 'u': /* File is setuid? */ + return (test_stat (arg, &stat_buf) == 0 && (stat_buf.st_mode & S_ISUID) != 0); + + case 'g': /* File is setgid? */ + return (test_stat (arg, &stat_buf) == 0 && (stat_buf.st_mode & S_ISGID) != 0); + + case 'k': /* File has sticky bit set? */ +#if !defined (S_ISVTX) + /* This is not Posix, and is not defined on some Posix systems. */ + return (FALSE); +#else + return (test_stat (arg, &stat_buf) == 0 && (stat_buf.st_mode & S_ISVTX) != 0); +#endif + + case 't': /* File fd is a terminal? */ + if (legal_number (arg, &r) == 0) + return (FALSE); + return ((r == (int)r) && isatty ((int)r)); + + case 'n': /* True if arg has some length. */ + return (arg[0] != '\0'); + + case 'z': /* True if arg has no length. */ + return (arg[0] == '\0'); + + case 'o': /* True if option `arg' is set. */ + return (minus_o_option_value (arg) == 1); + } + + /* We can't actually get here, but this shuts up gcc. */ + return (FALSE); +} + +/* Return TRUE if OP is one of the test command's binary operators. */ +int +test_binop (op) + char *op; +{ + if (op[0] == '=' && op[1] == '\0') + return (1); /* '=' */ + else if ((op[0] == '<' || op[0] == '>') && op[1] == '\0') /* string <, > */ + return (1); + else if ((op[0] == '=' || op[0] == '!') && op[1] == '=' && op[2] == '\0') + return (1); /* `==' and `!=' */ +#if defined (PATTERN_MATCHING) + else if (op[2] == '\0' && op[1] == '~' && (op[0] == '=' || op[0] == '!')) + return (1); +#endif + else if (op[0] != '-' || op[2] == '\0' || op[3] != '\0') + return (0); + else + { + if (op[2] == 't') + switch (op[1]) + { + case 'n': /* -nt */ + case 'o': /* -ot */ + case 'l': /* -lt */ + case 'g': /* -gt */ + return (1); + default: + return (0); + } + else if (op[1] == 'e') + switch (op[2]) + { + case 'q': /* -eq */ + case 'f': /* -ef */ + return (1); + default: + return (0); + } + else if (op[2] == 'e') + switch (op[1]) + { + case 'n': /* -ne */ + case 'g': /* -ge */ + case 'l': /* -le */ + return (1); + default: + return (0); + } + else + return (0); + } +} + +/* Return non-zero if OP is one of the test command's unary operators. */ +int +test_unop (op) + char *op; +{ + if (op[0] != '-') + return (0); + + switch (op[1]) + { + case 'a': case 'b': case 'c': case 'd': case 'e': + case 'f': case 'g': case 'h': case 'k': case 'n': + case 'o': case 'p': case 'r': case 's': case 't': + case 'u': case 'w': case 'x': case 'z': + case 'G': case 'L': case 'O': case 'S': case 'N': + return (1); + } + + return (0); +} + +static int +two_arguments () +{ + if (argv[pos][0] == '!' && argv[pos][1] == '\0') + return (argv[pos + 1][0] == '\0'); + else if (argv[pos][0] == '-' && argv[pos][2] == '\0') + { + if (test_unop (argv[pos])) + return (unary_operator ()); + else + test_syntax_error (_("%s: unary operator expected"), argv[pos]); + } + else + test_syntax_error (_("%s: unary operator expected"), argv[pos]); + + return (0); +} + +#define ANDOR(s) (s[0] == '-' && !s[2] && (s[1] == 'a' || s[1] == 'o')) + +/* This could be augmented to handle `-t' as equivalent to `-t 1', but + POSIX requires that `-t' be given an argument. */ +#define ONE_ARG_TEST(s) ((s)[0] != '\0') + +static int +three_arguments () +{ + int value; + + if (test_binop (argv[pos+1])) + { + value = binary_operator (); + pos = argc; + } + else if (ANDOR (argv[pos+1])) + { + if (argv[pos+1][1] == 'a') + value = ONE_ARG_TEST(argv[pos]) && ONE_ARG_TEST(argv[pos+2]); + else + value = ONE_ARG_TEST(argv[pos]) || ONE_ARG_TEST(argv[pos+2]); + pos = argc; + } + else if (argv[pos][0] == '!' && argv[pos][1] == '\0') + { + advance (1); + value = !two_arguments (); + } + else if (argv[pos][0] == '(' && argv[pos+2][0] == ')') + { + value = ONE_ARG_TEST(argv[pos+1]); + pos = argc; + } + else + test_syntax_error (_("%s: binary operator expected"), argv[pos+1]); + + return (value); +} + +/* This is an implementation of a Posix.2 proposal by David Korn. */ +static int +posixtest () +{ + int value; + + switch (argc - 1) /* one extra passed in */ + { + case 0: + value = FALSE; + pos = argc; + break; + + case 1: + value = ONE_ARG_TEST(argv[1]); + pos = argc; + break; + + case 2: + value = two_arguments (); + pos = argc; + break; + + case 3: + value = three_arguments (); + break; + + case 4: + if (argv[pos][0] == '!' && argv[pos][1] == '\0') + { + advance (1); + value = !three_arguments (); + break; + } + /* FALLTHROUGH */ + default: + value = expr (); + } + + return (value); +} + +/* + * [: + * '[' expr ']' + * test: + * test expr + */ +int +test_command (margc, margv) + int margc; + char **margv; +{ + int value; + int code; + + USE_VAR(margc); + + code = setjmp (test_exit_buf); + + if (code) + return (test_error_return); + + argv = margv; + + if (margv[0] && margv[0][0] == '[' && margv[0][1] == '\0') + { + --margc; + + if (margv[margc] && (margv[margc][0] != ']' || margv[margc][1])) + test_syntax_error (_("missing `]'"), (char *)NULL); + + if (margc < 2) + test_exit (SHELL_BOOLEAN (FALSE)); + } + + argc = margc; + pos = 1; + + if (pos >= argc) + test_exit (SHELL_BOOLEAN (FALSE)); + + noeval = 0; + value = posixtest (); + + if (pos != argc) + test_syntax_error (_("too many arguments"), (char *)NULL); + + test_exit (SHELL_BOOLEAN (value)); +} |