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-rw-r--r--builtins/getopt.c355
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diff --git a/builtins/getopt.c b/builtins/getopt.c
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+/* getopt.c - getopt for Bash. Used by the getopt builtin. */
+
+/* Copyright (C) 1993-2009 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 <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#if defined (HAVE_UNISTD_H)
+# ifdef _MINIX
+# include <sys/types.h>
+# endif
+# include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include "memalloc.h"
+#include "../bashintl.h"
+#include "../shell.h"
+#include "getopt.h"
+
+/* For communication from `sh_getopt' to the caller.
+ When `sh_getopt' finds an option that takes an argument,
+ the argument value is returned here. */
+char *sh_optarg = 0;
+
+/* Index in ARGV of the next element to be scanned.
+ This is used for communication to and from the caller
+ and for communication between successive calls to `sh_getopt'.
+
+ On entry to `sh_getopt', zero means this is the first call; initialize.
+
+ When `sh_getopt' returns EOF, this is the index of the first of the
+ non-option elements that the caller should itself scan.
+
+ Otherwise, `sh_optind' communicates from one call to the next
+ how much of ARGV has been scanned so far. */
+
+/* XXX 1003.2 says this must be 1 before any call. */
+int sh_optind = 0;
+
+/* Index of the current argument. */
+static int sh_curopt;
+
+/* The next char to be scanned in the option-element
+ in which the last option character we returned was found.
+ This allows us to pick up the scan where we left off.
+
+ If this is zero, or a null string, it means resume the scan
+ by advancing to the next ARGV-element. */
+
+static char *nextchar;
+static int sh_charindex;
+
+/* Callers store zero here to inhibit the error message
+ for unrecognized options. */
+
+int sh_opterr = 1;
+
+/* Set to an option character which was unrecognized.
+ This must be initialized on some systems to avoid linking in the
+ system's own getopt implementation. */
+
+int sh_optopt = '?';
+
+/* Set to 1 when we see an invalid option; public so getopts can reset it. */
+int sh_badopt = 0;
+
+/* Scan elements of ARGV (whose length is ARGC) for option characters
+ given in OPTSTRING.
+
+ If an element of ARGV starts with '-', and is not exactly "-" or "--",
+ then it is an option element. The characters of this element
+ (aside from the initial '-') are option characters. If `sh_getopt'
+ is called repeatedly, it returns successively each of the option characters
+ from each of the option elements.
+
+ If `sh_getopt' finds another option character, it returns that character,
+ updating `sh_optind' and `nextchar' so that the next call to `sh_getopt' can
+ resume the scan with the following option character or ARGV-element.
+
+ If there are no more option characters, `sh_getopt' returns `EOF'.
+ Then `sh_optind' is the index in ARGV of the first ARGV-element
+ that is not an option.
+
+ OPTSTRING is a string containing the legitimate option characters.
+ If an option character is seen that is not listed in OPTSTRING,
+ return '?' after printing an error message. If you set `sh_opterr' to
+ zero, the error message is suppressed but we still return '?'.
+
+ If a char in OPTSTRING is followed by a colon, that means it wants an arg,
+ so the following text in the same ARGV-element, or the text of the following
+ ARGV-element, is returned in `sh_optarg'. */
+
+/* 1003.2 specifies the format of this message. */
+#define BADOPT(x) fprintf (stderr, _("%s: illegal option -- %c\n"), argv[0], x)
+#define NEEDARG(x) fprintf (stderr, _("%s: option requires an argument -- %c\n"), argv[0], x)
+
+int
+sh_getopt (argc, argv, optstring)
+ int argc;
+ char *const *argv;
+ const char *optstring;
+{
+ char c, *temp;
+
+ sh_optarg = 0;
+
+ if (sh_optind >= argc || sh_optind < 0) /* XXX was sh_optind > argc */
+ {
+ sh_optind = argc;
+ return (EOF);
+ }
+
+ /* Initialize the internal data when the first call is made.
+ Start processing options with ARGV-element 1 (since ARGV-element 0
+ is the program name); the sequence of previously skipped
+ non-option ARGV-elements is empty. */
+
+ if (sh_optind == 0)
+ {
+ sh_optind = 1;
+ nextchar = (char *)NULL;
+ }
+
+ if (nextchar == 0 || *nextchar == '\0')
+ {
+ /* If we have done all the ARGV-elements, stop the scan. */
+ if (sh_optind >= argc)
+ return EOF;
+
+ temp = argv[sh_optind];
+
+ /* Special ARGV-element `--' means premature end of options.
+ Skip it like a null option, and return EOF. */
+ if (temp[0] == '-' && temp[1] == '-' && temp[2] == '\0')
+ {
+ sh_optind++;
+ return EOF;
+ }
+
+ /* If we have come to a non-option, either stop the scan or describe
+ it to the caller and pass it by. This makes the pseudo-option
+ `-' mean the end of options, but does not skip over it. */
+ if (temp[0] != '-' || temp[1] == '\0')
+ return EOF;
+
+ /* We have found another option-ARGV-element.
+ Start decoding its characters. */
+ nextchar = argv[sh_curopt = sh_optind] + 1;
+ sh_charindex = 1;
+ }
+
+ /* Look at and handle the next option-character. */
+
+ c = *nextchar++; sh_charindex++;
+ temp = strchr (optstring, c);
+
+ sh_optopt = c;
+
+ /* Increment `sh_optind' when we start to process its last character. */
+ if (nextchar == 0 || *nextchar == '\0')
+ {
+ sh_optind++;
+ nextchar = (char *)NULL;
+ }
+
+ if (sh_badopt = (temp == NULL || c == ':'))
+ {
+ if (sh_opterr)
+ BADOPT (c);
+
+ return '?';
+ }
+
+ if (temp[1] == ':')
+ {
+ if (nextchar && *nextchar)
+ {
+ /* This is an option that requires an argument. */
+ sh_optarg = nextchar;
+ /* If we end this ARGV-element by taking the rest as an arg,
+ we must advance to the next element now. */
+ sh_optind++;
+ }
+ else if (sh_optind == argc)
+ {
+ if (sh_opterr)
+ NEEDARG (c);
+
+ sh_optopt = c;
+ sh_optarg = ""; /* Needed by getopts. */
+ c = (optstring[0] == ':') ? ':' : '?';
+ }
+ else
+ /* We already incremented `sh_optind' once;
+ increment it again when taking next ARGV-elt as argument. */
+ sh_optarg = argv[sh_optind++];
+ nextchar = (char *)NULL;
+ }
+ return c;
+}
+
+void
+sh_getopt_restore_state (argv)
+ char **argv;
+{
+ if (nextchar)
+ nextchar = argv[sh_curopt] + sh_charindex;
+}
+
+sh_getopt_state_t *
+sh_getopt_alloc_istate ()
+{
+ sh_getopt_state_t *ret;
+
+ ret = (sh_getopt_state_t *)xmalloc (sizeof (sh_getopt_state_t));
+ return ret;
+}
+
+void
+sh_getopt_dispose_istate (gs)
+ sh_getopt_state_t *gs;
+{
+ free (gs);
+}
+
+sh_getopt_state_t *
+sh_getopt_save_istate ()
+{
+ sh_getopt_state_t *ret;
+
+ ret = sh_getopt_alloc_istate ();
+
+ ret->gs_optarg = sh_optarg;
+ ret->gs_optind = sh_optind;
+ ret->gs_curopt = sh_curopt;
+ ret->gs_nextchar = nextchar; /* XXX */
+ ret->gs_charindex = sh_charindex;
+ ret->gs_flags = 0; /* XXX for later use */
+
+ return ret;
+}
+
+void
+sh_getopt_restore_istate (state)
+ sh_getopt_state_t *state;
+{
+ sh_optarg = state->gs_optarg;
+ sh_optind = state->gs_optind;
+ sh_curopt = state->gs_curopt;
+ nextchar = state->gs_nextchar; /* XXX - probably not usable */
+ sh_charindex = state->gs_charindex;
+
+ sh_getopt_dispose_istate (state);
+}
+
+#if 0
+void
+sh_getopt_debug_restore_state (argv)
+ char **argv;
+{
+ if (nextchar && nextchar != argv[sh_curopt] + sh_charindex)
+ {
+ itrace("sh_getopt_debug_restore_state: resetting nextchar");
+ nextchar = argv[sh_curopt] + sh_charindex;
+ }
+}
+#endif
+
+#ifdef TEST
+
+/* Compile with -DTEST to make an executable for use in testing
+ the above definition of `sh_getopt'. */
+
+int
+main (argc, argv)
+ int argc;
+ char **argv;
+{
+ int c;
+ int digit_sh_optind = 0;
+
+ while (1)
+ {
+ int this_option_sh_optind = sh_optind ? sh_optind : 1;
+
+ c = sh_getopt (argc, argv, "abc:d:0123456789");
+ if (c == EOF)
+ break;
+
+ switch (c)
+ {
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ if (digit_sh_optind != 0 && digit_sh_optind != this_option_sh_optind)
+ printf ("digits occur in two different argv-elements.\n");
+ digit_sh_optind = this_option_sh_optind;
+ printf ("option %c\n", c);
+ break;
+
+ case 'a':
+ printf ("option a\n");
+ break;
+
+ case 'b':
+ printf ("option b\n");
+ break;
+
+ case 'c':
+ printf ("option c with value `%s'\n", sh_optarg);
+ break;
+
+ case '?':
+ break;
+
+ default:
+ printf ("?? sh_getopt returned character code 0%o ??\n", c);
+ }
+ }
+
+ if (sh_optind < argc)
+ {
+ printf ("non-option ARGV-elements: ");
+ while (sh_optind < argc)
+ printf ("%s ", argv[sh_optind++]);
+ printf ("\n");
+ }
+
+ exit (0);
+}
+
+#endif /* TEST */
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