home *** CD-ROM | disk | FTP | other *** search
- /* GNU test program (ksb and mjb) */
-
- /* Modified to run with the GNU shell Apr 25, 1988 by bfox. */
-
- /* Copyright (C) 1987, 1988, 1989, 1990, 1991 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Define STANDALONE to get the /bin/test version. Otherwise, you get
- the shell builtin version. */
- /* #define STANDALONE */
-
- #include <stdio.h>
- #include <sys/types.h>
-
- #if defined (STANDALONE)
- # if defined (HAVE_UNISTD_H)
- # include <unistd.h>
- # endif /* HAVE_UNISTD_H */
- #else /* !STANDALONE */
- # include "shell.h"
- #endif /* !STANDALONE */
-
- #if !defined (_POSIX_VERSION)
- # include <sys/file.h>
- #endif /* !_POSIX_VERSION */
-
- #include <errno.h>
- #if !defined (errno)
- extern int errno;
- #endif /* !errno */
-
- #if !defined (STANDALONE)
- # include "posixstat.h"
- # include "filecntl.h"
- #else /* STANDALONE */
- # include "system.h"
- # if !defined (S_IXUGO)
- # define S_IXUGO 0111
- # endif
- #endif /* STANDALONE */
-
- #if !defined (STREQ)
- # define STREQ(a, b) ((a)[0] == (b)[0] && strcmp (a, b) == 0)
- #endif /* !STREQ */
-
- #if !defined (member)
- # define member(c, s) (int)((c) ? index ((s), (c)) : 0)
- #endif /* !member */
-
- #if defined (STANDALONE) && (defined (USG) || defined (STDC_HEADERS))
- # if !defined (index)
- # define index strchr
- # define rindex strrchr
- # endif /* !index */
- #endif /* STANDALONE && (USG || STDC_HEADERS) */
-
- /* Make gid_t and uid_t mean something for non-posix systems. */
- #if !defined (_POSIX_VERSION) && !defined(sprite)
- # if !defined (gid_t)
- # define gid_t int
- # endif
- # if !defined (uid_t)
- # define uid_t int
- # endif
- #endif /* !_POSIX_VERSION */
-
- extern gid_t getgid (), getegid ();
- extern uid_t geteuid ();
-
- #if !defined (R_OK)
- #define R_OK 4
- #define W_OK 2
- #define X_OK 1
- #define F_OK 0
- #endif /* R_OK */
-
- /* 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.
- TRUTH_OR is how to do logical or with TRUE and FALSE.
- TRUTH_AND is how to do logical and with TRUE and FALSE..
- Default is TRUE = 1, FALSE = 0, TRUTH_OR = a | b, TRUTH_AND = a & b,
- SHELL_BOOLEAN = (!value). */
- #define TRUE 1
- #define FALSE 0
- #define SHELL_BOOLEAN(value) (!(value))
- #define TRUTH_OR(a, b) ((a) | (b))
- #define TRUTH_AND(a, b) ((a) & (b))
-
- #if defined (STANDALONE)
- # define test_exit(val) exit (val)
- #else
- static jmp_buf test_exit_buf;
- static int test_error_return = 0;
- # define test_exit(val) test_error_return = val, longjmp (test_exit_buf, 1)
- #endif /* STANDALONE */
-
- 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 unop ();
- static int binop ();
- static int unary_operator ();
- static int binary_operator ();
- static int two_arguments ();
- static int three_arguments ();
- static int posixtest ();
-
- static int expr ();
- static int term ();
- static int and ();
- static int or ();
-
- static void
- test_syntax_error (format, arg)
- char *format, *arg;
- {
- fprintf (stderr, "%s: ", argv[0]);
- fprintf (stderr, format, arg);
- fflush (stderr);
- test_exit (SHELL_BOOLEAN (FALSE));
- }
-
- /* A wrapper for stat () which disallows pathnames that are empty strings. */
- static int
- test_stat (path, finfo)
- char *path;
- struct stat *finfo;
- {
- if (*path == '\0')
- {
- errno = ENOENT;
- return (-1);
- }
- 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. */
- static int
- eaccess (path, mode)
- char *path;
- int mode;
- {
- extern int group_member ();
- struct stat st;
- static int euid = -1;
-
- if (test_stat (path, &st) < 0)
- return (-1);
-
- if (euid == -1)
- euid = geteuid ();
-
- if (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 == euid) /* owner */
- mode <<= 6;
- else if (group_member (st.st_gid))
- mode <<= 3;
-
- if (st.st_mode & mode)
- return (0);
-
- return (-1);
- }
-
- #if defined (HAVE_GETGROUPS)
- /* The number of groups that this user is a member of. */
- static int ngroups = 0;
- static gid_t *group_array = (gid_t *)NULL;
- static int default_group_array_size = 0;
- #endif /* HAVE_GETGROUPS */
-
- /* Return non-zero if GID is one that we have in our groups list. */
- int
- group_member (gid)
- gid_t gid;
- {
- #if !defined (HAVE_GETGROUPS)
- return ((gid == getgid ()) || (gid == getegid ()));
- #else
- register int i;
-
- /* getgroups () returns the number of elements that it was able to
- place into the array. We simply continue to call getgroups ()
- until the number of elements placed into the array is smaller than
- the physical size of the array. */
-
- while (ngroups == default_group_array_size)
- {
- default_group_array_size += 64;
-
- group_array = (gid_t *)
- xrealloc (group_array,
- default_group_array_size * sizeof (gid_t));
-
- ngroups = getgroups (default_group_array_size, group_array);
- }
-
- /* In case of error, the user loses. */
- if (ngroups < 0)
- return (0);
-
- /* Search through the list looking for GID. */
- for (i = 0; i < ngroups; i++)
- if (gid == group_array[i])
- return (1);
-
- return (0);
- #endif /* HAVE_GETGROUPS */
- }
-
- /* 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. */
- #if !defined (lint)
- #define advance(f) (++pos, f && (pos < argc ? 0 : beyond()))
- #endif
-
- #if !defined (advance)
- static int
- advance (f)
- int f;
- {
- ++pos;
-
- if (f && pos >= argc)
- beyond ();
- }
- #endif /* advance */
-
- #define unary_advance() (advance (1),++pos)
-
- /*
- * beyond - call when we're beyond the end of the argument list (an
- * error condition)
- */
- static int
- beyond ()
- {
- test_syntax_error ("argument expected\n", (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 ("integer expression expected %s\n", pch);
- }
-
- /* Return non-zero if the characters pointed to by STRING constitute a
- valid number. Stuff the converted number into RESULT if RESULT is
- a non-null pointer to a long. */
- static int
- isint (string, result)
- register char *string;
- long *result;
- {
- int sign;
- long value;
-
- sign = 1;
- value = 0;
-
- if (result)
- *result = 0;
-
- /* Skip leading whitespace characters. */
- while (whitespace (*string))
- string++;
-
- if (!*string)
- return (0);
-
- /* We allow leading `-' or `+'. */
- if (*string == '-' || *string == '+')
- {
- if (!digit (string[1]))
- return (0);
-
- if (*string == '-')
- sign = -1;
-
- string++;
- }
-
- while (digit (*string))
- {
- if (result)
- value = (value * 10) + digit_value (*string);
- string++;
- }
-
- /* Skip trailing whitespace, if any. */
- while (whitespace (*string))
- string++;
-
- /* Error if not at end of string. */
- if (*string)
- return (0);
-
- if (result)
- {
- value *= sign;
- *result = value;
- }
-
- return (1);
- }
-
- /* Find the modification time of FILE, and stuff it into AGE, a pointer
- to a long. Return non-zero if successful, else zero. */
- static int
- age_of (filename, age)
- char *filename;
- long *age;
- {
- struct stat finfo;
-
- if (test_stat (filename, &finfo) < 0)
- return (0);
-
- if (age)
- *age = finfo.st_mtime;
-
- return (1);
- }
-
- /*
- * term - parse a term and return 1 or 0 depending on whether the term
- * evaluates to true or false, respectively.
- *
- * term ::=
- * '-'('h'|'d'|'f'|'r'|'s'|'w'|'c'|'b'|'p'|'u'|'g'|'k') filename
- * '-'('L'|'x') filename
- * '-t' [ int ]
- * '-'('z'|'n') string
- * string
- * string ('!='|'=') string
- * <int> '-'(eq|ne|le|lt|ge|gt) <int>
- * file '-'(nt|ot|ef) file
- * '(' <expr> ')'
- * int ::=
- * '-l' string
- * positive and negative integers
- */
- static int
- term ()
- {
- int value;
-
- if (pos >= argc)
- beyond ();
-
- /* Deal with leading "not"'s. */
- if ('!' == argv[pos][0] && '\000' == argv[pos][1])
- {
- value = FALSE;
- while (pos < argc && '!' == argv[pos][0] && '\000' == argv[pos][1])
- {
- advance (1);
- value ^= (TRUE);
- }
-
- return (value ^ (term ()));
- }
-
- /* A paren-bracketed argument. */
- if (argv[pos][0] == '(' && !argv[pos][1])
- {
- advance (1);
- value = expr ();
- if (argv[pos][0] != ')' || argv[pos][1])
- test_syntax_error ("')' expected, found %s\n", argv[pos]);
- advance (0);
- return (TRUE == (value));
- }
-
- /* are there enough arguments left that this could be dyadic? */
- if (((pos + 3 <= argc) && binop (argv[pos + 1])) ||
- ((pos + 4 <= argc && STREQ (argv[pos], "-l") && binop (argv[pos + 2]))))
- value = binary_operator ();
-
- /* Might be a switch type argument */
- else if ('-' == argv[pos][0] && 0 == argv[pos][2])
- {
- if (unop (argv[pos][1]))
- value = unary_operator ();
- else
- test_syntax_error ("%s: unary operator expected\n", argv[pos]);
- }
- else
- {
- value = (argv[pos][0] != '\0');
- advance (0);
- }
-
- return (value);
- }
-
- static int
- binary_operator ()
- {
- register int op;
- struct stat stat_buf, stat_spare;
- long int l, r, value;
- /* Are the left and right integer expressions of the form '-l string'? */
- int l_is_l, r_is_l;
-
- if (strcmp (argv[pos], "-l") == 0)
- {
- l_is_l = 1;
- op = pos + 2;
-
- /* Make sure that OP is still a valid binary operator. */
- if ((op >= argc - 1) || (binop (argv[op]) == 0))
- test_syntax_error ("%s: binary operator expected\n", argv[op]);
-
- advance (0);
- }
- else
- {
- l_is_l = 0;
- op = pos + 1;
- }
-
- if ((op < argc - 2) && (strcmp (argv[op + 1], "-l") == 0))
- {
- r_is_l = 1;
- advance (0);
- }
- else
- r_is_l = 0;
-
- if (argv[op][0] == '-')
- {
- /* check for eq, nt, and stuff */
- switch (argv[op][1])
- {
- default:
- break;
-
- case 'l':
- if (argv[op][2] == 't' && !argv[op][3])
- {
- /* lt */
- if (l_is_l)
- l = strlen (argv[op - 1]);
- else
- {
- if (!isint (argv[op - 1], &l))
- integer_expected_error ("before -lt");
- }
-
- if (r_is_l)
- r = strlen (argv[op + 2]);
- else
- {
- if (!isint (argv[op + 1], &r))
- integer_expected_error ("after -lt");
- }
- pos += 3;
- return (TRUE == (l < r));
- }
-
- if (argv[op][2] == 'e' && !argv[op][3])
- {
- /* le */
- if (l_is_l)
- l = strlen (argv[op - 1]);
- else
- {
- if (!isint (argv[op - 1], &l))
- integer_expected_error ("before -le");
- }
- if (r_is_l)
- r = strlen (argv[op + 2]);
- else
- {
- if (!isint (argv[op + 1], &r))
- integer_expected_error ("after -le");
- }
- pos += 3;
- return (TRUE == (l <= r));
- }
- break;
-
- case 'g':
- if (argv[op][2] == 't' && !argv[op][3])
- {
- /* gt integer greater than */
- if (l_is_l)
- l = strlen (argv[op - 1]);
- else
- {
- if (!isint (argv[op - 1], &l))
- integer_expected_error ("before -gt");
- }
- if (r_is_l)
- r = strlen (argv[op + 2]);
- else
- {
- if (!isint (argv[op + 1], &r))
- integer_expected_error ("after -gt");
- }
- pos += 3;
- return (TRUE == (l > r));
- }
-
- if (argv[op][2] == 'e' && !argv[op][3])
- {
- /* ge - integer greater than or equal to */
- if (l_is_l)
- l = strlen (argv[op - 1]);
- else
- {
- if (!isint (argv[op - 1], &l))
- integer_expected_error ("before -ge");
- }
- if (r_is_l)
- r = strlen (argv[op + 2]);
- else
- {
- if (!isint (argv[op + 1], &r))
- integer_expected_error ("after -ge");
- }
- pos += 3;
- return (TRUE == (l >= r));
- }
- break;
-
- case 'n':
- if (argv[op][2] == 't' && !argv[op][3])
- {
- /* nt - newer than */
- pos += 3;
- if (l_is_l || r_is_l)
- test_syntax_error ("-nt does not accept -l\n", (char *)NULL);
- if (age_of (argv[op - 1], &l) && age_of (argv[op + 1], &r))
- return (TRUE == (l > r));
- else
- return (FALSE);
- }
-
- if (argv[op][2] == 'e' && !argv[op][3])
- {
- /* ne - integer not equal */
- if (l_is_l)
- l = strlen (argv[op - 1]);
- else
- {
- if (!isint (argv[op - 1], &l))
- integer_expected_error ("before -ne");
- }
- if (r_is_l)
- r = strlen (argv[op + 2]);
- else
- {
- if (!isint (argv[op + 1], &r))
- integer_expected_error ("after -ne");
- }
- pos += 3;
- return (TRUE == (l != r));
- }
- break;
-
- case 'e':
- if (argv[op][2] == 'q' && !argv[op][3])
- {
- /* eq - integer equal */
- if (l_is_l)
- l = strlen (argv[op - 1]);
- else
- {
- if (!isint (argv[op - 1], &l))
- integer_expected_error ("before -eq");
- }
- if (r_is_l)
- r = strlen (argv[op + 2]);
- else
- {
- if (!isint (argv[op + 1], &r))
- integer_expected_error ("after -eq");
- }
- pos += 3;
- return (TRUE == (l == r));
- }
-
- if (argv[op][2] == 'f' && !argv[op][3])
- {
- /* ef - hard link? */
- pos += 3;
- if (l_is_l || r_is_l)
- test_syntax_error ("-ef does not accept -l\n", (char *)NULL);
- if (stat (argv[op - 1], &stat_buf) < 0)
- return (FALSE);
- if (stat (argv[op + 1], &stat_spare) < 0)
- return (FALSE);
- return (TRUE ==
- (stat_buf.st_dev == stat_spare.st_dev &&
- stat_buf.st_ino == stat_spare.st_ino));
- }
- break;
-
- case 'o':
- if ('t' == argv[op][2] && '\000' == argv[op][3])
- {
- /* ot - older than */
- pos += 3;
- if (l_is_l || r_is_l)
- test_syntax_error ("-nt does not accept -l\n", (char *)NULL);
- if (age_of (argv[op - 1], &l) && age_of (argv[op + 1], &r))
- return (TRUE == (l < r));
- return (FALSE);
- }
- break;
- }
- test_syntax_error ("unknown binary operator", argv[op]);
- }
-
- if (argv[op][0] == '=' && !argv[op][1])
- {
- value = (strcmp (argv[pos], argv[pos + 2]) == 0);
- pos += 3;
- return (TRUE == value);
- }
-
- if (strcmp (argv[op], "!=") == 0)
- {
- value = (strcmp (argv[pos], argv[pos + 2]) != 0);
- pos += 3;
- return (TRUE == value);
- }
- }
-
- static int
- unary_operator ()
- {
- long r, value;
- struct stat stat_buf;
-
- switch (argv[pos][1])
- {
- default:
- return (FALSE);
-
- /* All of the following unary operators use 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. */
-
- case 'a': /* file exists in the file system? */
- case 'e':
- unary_advance ();
- value = -1 != test_stat (argv[pos - 1], &stat_buf);
- return (TRUE == value);
-
- case 'r': /* file is readable? */
- unary_advance ();
- value = -1 != eaccess (argv[pos - 1], R_OK);
- return (TRUE == value);
-
- case 'w': /* File is writeable? */
- unary_advance ();
- value = -1 != eaccess (argv[pos - 1], W_OK);
- return (TRUE == value);
-
- case 'x': /* File is executable? */
- unary_advance ();
- value = -1 != eaccess (argv[pos - 1], X_OK);
- return (TRUE == value);
-
- case 'O': /* File is owned by you? */
- unary_advance ();
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
-
- return (TRUE == (geteuid () == stat_buf.st_uid));
-
- case 'G': /* File is owned by your group? */
- unary_advance ();
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
-
- return (TRUE == (getegid () == stat_buf.st_gid));
-
- case 'f': /* File is a file? */
- unary_advance ();
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
-
- /* Under POSIX, -f is true if the given file exists
- and is a regular file. */
- return (TRUE == ((S_ISREG (stat_buf.st_mode)) ||
- (0 == (stat_buf.st_mode & S_IFMT))));
-
- case 'd': /* File is a directory? */
- unary_advance ();
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
-
- return (TRUE == (S_ISDIR (stat_buf.st_mode)));
-
- case 's': /* File has something in it? */
- unary_advance ();
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
-
- return (TRUE == (stat_buf.st_size > (off_t) 0));
-
- case 'S': /* File is a socket? */
- #if !defined (S_ISSOCK)
- return (FALSE);
- #else
- unary_advance ();
-
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
-
- return (TRUE == (S_ISSOCK (stat_buf.st_mode)));
- #endif /* S_ISSOCK */
-
- case 'c': /* File is character special? */
- unary_advance ();
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
-
- return (TRUE == (S_ISCHR (stat_buf.st_mode)));
-
- case 'b': /* File is block special? */
- unary_advance ();
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
-
- return (TRUE == (S_ISBLK (stat_buf.st_mode)));
-
- case 'p': /* File is a named pipe? */
- unary_advance ();
- #ifndef S_ISFIFO
- return (FALSE);
- #else
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
- return (TRUE == (S_ISFIFO (stat_buf.st_mode)));
- #endif /* S_ISFIFO */
-
- case 'L': /* Same as -h */
- /*FALLTHROUGH*/
-
- case 'h': /* File is a symbolic link? */
- unary_advance ();
- #ifndef S_ISLNK
- return (FALSE);
- #else
- /* An empty filename is not a valid pathname. */
- if ((argv[pos - 1][0] == '\0') ||
- (lstat (argv[pos - 1], &stat_buf) < 0))
- return (FALSE);
-
- return (TRUE == (S_ISLNK (stat_buf.st_mode)));
- #endif /* S_IFLNK */
-
- case 'u': /* File is setuid? */
- unary_advance ();
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
-
- return (TRUE == (0 != (stat_buf.st_mode & S_ISUID)));
-
- case 'g': /* File is setgid? */
- unary_advance ();
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
-
- return (TRUE == (0 != (stat_buf.st_mode & S_ISGID)));
-
- case 'k': /* File has sticky bit set? */
- unary_advance ();
- if (test_stat (argv[pos - 1], &stat_buf) < 0)
- return (FALSE);
- #if !defined (S_ISVTX)
- /* This is not Posix, and is not defined on some Posix systems. */
- return (FALSE);
- #else
- return (TRUE == (0 != (stat_buf.st_mode & S_ISVTX)));
- #endif
-
- case 't': /* File (fd) is a terminal? (fd) defaults to stdout. */
- advance (0);
- if (pos < argc && isint (argv[pos], &r))
- {
- advance (0);
- return (TRUE == (isatty ((int) r)));
- }
- return (TRUE == (isatty (1)));
-
- case 'n': /* True if arg has some length. */
- unary_advance ();
- return (TRUE == (argv[pos - 1][0] != 0));
-
- case 'z': /* True if arg has no length. */
- unary_advance ();
- return (TRUE == (argv[pos - 1][0] == '\0'));
- }
- }
-
- /*
- * and:
- * term
- * term '-a' and
- */
- static int
- and ()
- {
- int value;
-
- value = term ();
- while ((pos < argc) && strcmp (argv[pos], "-a") == 0)
- {
- advance (0);
- value = TRUTH_AND (value, and ());
- }
- return (TRUE == value);
- }
-
- /*
- * or:
- * and
- * and '-o' or
- */
- static int
- or ()
- {
- int value;
-
- value = and ();
-
- while ((pos < argc) && strcmp (argv[pos], "-o") == 0)
- {
- advance (0);
- value = TRUTH_OR (value, or ());
- }
-
- return (TRUE == value);
- }
-
- /*
- * expr:
- * or
- */
- static int
- expr ()
- {
- if (pos >= argc)
- beyond ();
-
- return (FALSE ^ (or ())); /* Same with this. */
- }
-
- /* Return TRUE if S is one of the test command's binary operators. */
- static int
- binop (s)
- char *s;
- {
- return ((STREQ (s, "=")) || (STREQ (s, "!=")) || (STREQ (s, "-nt")) ||
- (STREQ (s, "-ot")) || (STREQ (s, "-ef")) || (STREQ (s, "-eq")) ||
- (STREQ (s, "-ne")) || (STREQ (s, "-lt")) || (STREQ (s, "-le")) ||
- (STREQ (s, "-gt")) || (STREQ (s, "-ge")));
- }
-
- /* Return non-zero if OP is one of the test command's unary operators. */
- static int
- unop (op)
- int op;
- {
- return (member (op, "abcdefgkLhprsStuwxOGnz"));
- }
-
- static int
- two_arguments ()
- {
- int value;
-
- if (STREQ (argv[pos], "!"))
- value = strlen (argv[pos + 1]) == 0;
- else if ((argv[pos][0] == '-') && (argv[pos][2] == '\0'))
- {
- if (unop (argv[pos][1]))
- value = unary_operator ();
- else
- test_syntax_error ("%s: unary operator expected\n", argv[pos]);
- }
- else
- beyond ();
- return (value);
- }
-
- static int
- three_arguments ()
- {
- int value;
-
- if (STREQ (argv[pos], "!"))
- {
- advance (1);
- value = !two_arguments ();
- }
- else if (binop (argv[pos+1]))
- {
- value = binary_operator ();
- pos = argc;
- }
- else if ((STREQ (argv[pos+1], "-a")) || (STREQ (argv[pos+1], "-o")) ||
- (argv[pos][0] == '('))
- value = expr ();
- else
- test_syntax_error ("%s: binary operator expected\n", 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 = strlen (argv[1]) != 0;
- pos = argc;
- break;
-
- case 2:
- value = two_arguments ();
- pos = argc;
- break;
-
- case 3:
- value = three_arguments ();
- break;
-
- case 4:
- if (STREQ (argv[pos], "!"))
- {
- advance (1);
- value = !three_arguments ();
- break;
- }
- /* FALLTHROUGH */
- case 5:
- default:
- value = expr ();
- }
-
- return (value);
- }
-
- /*
- * [:
- * '[' expr ']'
- * test:
- * test expr
- */
- int
- #if defined (STANDALONE)
- main (margc, margv)
- #else
- test_command (margc, margv)
- #endif /* STANDALONE */
- int margc;
- char **margv;
- {
- auto int value;
- int expr ();
-
- #if !defined (STANDALONE)
- int code;
-
- code = setjmp (test_exit_buf);
-
- if (code)
- return (test_error_return);
- #endif /* STANDALONE */
-
- argv = margv;
-
- if (margv[0] && strcmp (margv[0], "[") == 0)
- {
- --margc;
-
- if (margc < 2)
- test_exit (SHELL_BOOLEAN (FALSE));
-
- if (margv[margc] && strcmp (margv[margc], "]") != 0)
- test_syntax_error ("missing `]'\n", (char *)NULL);
- }
-
- argc = margc;
- pos = 1;
-
- if (pos >= argc)
- test_exit (SHELL_BOOLEAN (FALSE));
-
- value = posixtest ();
-
- if (pos != argc)
- test_syntax_error ("too many arguments\n", (char *)NULL);
-
- test_exit (SHELL_BOOLEAN (value));
- }
-