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- /*
- * Getopt for GNU. Copyright (C) 1987, 1989, 1990, 1991 Free Software
- * Foundation, Inc.
- *
- * This program 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.
- *
- * This program 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
- * this program; if not, write to the Free Software Foundation, Inc., 675
- * Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #ifdef __STDC__
- #define CONST const
- #else
- #define CONST
- #endif
-
- /*
- * This version of `getopt' appears to the caller like standard Unix `getopt'
- * but it behaves differently for the user, since it allows the user to
- * intersperse the options with the other arguments.
- *
- * As `getopt' works, it permutes the elements of `argv' so that, when it is
- * done, all the options precede everything else. Thus all application
- * programs are extended to handle flexible argument order.
- *
- * Setting the environment variable _POSIX_OPTION_ORDER disables permutation.
- * Then the behavior is completely standard.
- *
- * GNU application programs can use a third alternative mode in which they can
- * distinguish the relative order of options and other arguments.
- */
-
- #include <stdio.h>
-
- /* If compiled with GNU C, use the built-in alloca */
- #ifdef __GNUC__
- #define alloca __builtin_alloca
- #else /* not __GNUC__ */
- #if defined (sparc) || defined (_DCC)
- #include <alloca.h>
-
- #define index(p1, p2) strchr(p1, p2)
- #define rindex(p1, p2) strrchr(p1, p2)
-
- #else
- #ifdef _AIX
- #pragma alloca
- #else
- char *alloca ();
-
- #endif
- #endif /* sparc */
- #endif /* not __GNUC__ */
-
- #if defined(STDC_HEADERS) || defined(__GNU_LIBRARY__)
- #include <stdlib.h>
- #else /* STDC_HEADERS or __GNU_LIBRARY__ */
- char *getenv ();
- char *malloc ();
-
- #endif /* STDC_HEADERS or __GNU_LIBRARY__ */
-
- #if defined(USG) || defined(STDC_HEADERS) || defined(__GNU_LIBRARY__)
- #include <string.h>
- #define bcopy(s, d, n) memcpy ((d), (s), (n))
- #define index strchr
- #else /* USG or STDC_HEADERS or __GNU_LIBRARY__ */
- #ifdef VMS
- #include <string.h>
- #else /* VMS */
- #include <strings.h>
- #endif /* VMS */
- /*
- * Declaring bcopy causes errors on systems whose declarations are different.
- * If the declaration is omitted, everything works fine.
- */
- #endif /* USG or STDC_HEADERS or __GNU_LIBRARY__ */
-
- /*
- * For communication from `getopt' to the caller. When `getopt' finds an
- * option that takes an argument, the argument value is returned here. Also,
- * when `ordering' is RETURN_IN_ORDER, each non-option ARGV-element is
- * returned here.
- */
-
- char *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 `getopt'.
- *
- * On entry to `getopt', zero means this is the first call; initialize.
- *
- * When `getopt' returns EOF, this is the index of the first of the non-option
- * elements that the caller should itself scan.
- *
- * Otherwise, `optind' communicates from one call to the next how much of ARGV
- * has been scanned so far.
- */
-
- int optind = 0;
-
- /*
- * 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;
-
- /*
- * Callers store zero here to inhibit the error message for unrecognized
- * options.
- */
-
- int opterr = 1;
-
- /*
- * Describe how to deal with options that follow non-option ARGV-elements.
- *
- * If the caller did not specify anything, the default is REQUIRE_ORDER if the
- * environment variable _POSIX_OPTION_ORDER is defined, PERMUTE otherwise.
- *
- * REQUIRE_ORDER means don't recognize them as options; stop option processing
- * when the first non-option is seen. This is what Unix does. This mode of
- * operation is selected by either setting the environment variable
- * _POSIX_OPTION_ORDER, or using `+' as the first character of the list of
- * option characters.
- *
- * PERMUTE is the default. We permute the contents of ARGV as we scan, so that
- * eventually all the non-options are at the end. This allows options to be
- * given in any order, even with programs that were not written to expect
- * this.
- *
- * RETURN_IN_ORDER is an option available to programs that were written to
- * expect options and other ARGV-elements in any order and that care about
- * the ordering of the two. We describe each non-option ARGV-element as if
- * it were the argument of an option with character code 1. Using `-' as the
- * first character of the list of option characters selects this mode of
- * operation.
- *
- * The special argument `--' forces an end of option-scanning regardless of the
- * value of `ordering'. In the case of RETURN_IN_ORDER, only `--' can cause
- * `getopt' to return EOF with `optind' != ARGC.
- */
-
- static enum
- {
- REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
- } ordering;
-
- /*
- * Describe the long-named options requested by the application.
- * _GETOPT_LONG_OPTIONS is a vector of `struct option' terminated by an
- * element containing a name which is zero. The field `has_arg' is 1 if the
- * option takes an argument, 2 if it takes an optional argument.
- */
-
- struct option
- {
- char *name;
- int has_arg;
- int *flag;
- int val;
- };
-
- CONST struct option *_getopt_long_options;
-
- int _getopt_long_only = 0;
-
- /*
- * Index in _GETOPT_LONG_OPTIONS of the long-named option actually found.
- * Only valid when a long-named option was found.
- */
-
- int option_index;
-
- /* Handle permutation of arguments. */
-
- /*
- * Describe the part of ARGV that contains non-options that have been
- * skipped. `first_nonopt' is the index in ARGV of the first of them;
- * `last_nonopt' is the index after the last of them.
- */
-
- static int first_nonopt;
- static int last_nonopt;
-
- /*
- * Exchange two adjacent subsequences of ARGV. One subsequence is elements
- * [first_nonopt,last_nonopt) which contains all the non-options that have
- * been skipped so far. The other is elements [last_nonopt,optind), which
- * contains all the options processed since those non-options were skipped.
- *
- * `first_nonopt' and `last_nonopt' are relocated so that they describe the new
- * indices of the non-options in ARGV after they are moved.
- */
-
- static void
- exchange (argv)
- char **argv;
- {
- int nonopts_size = (last_nonopt - first_nonopt) * sizeof (char *);
- char **temp = (char **) alloca (nonopts_size);
-
- /* Interchange the two blocks of data in ARGV. */
-
- bcopy (&argv[first_nonopt], temp, nonopts_size);
- bcopy (&argv[last_nonopt], &argv[first_nonopt],
- (optind - last_nonopt) * sizeof (char *));
-
- bcopy (temp, &argv[first_nonopt + optind - last_nonopt], nonopts_size);
-
- /* Update records for the slots the non-options now occupy. */
-
- first_nonopt += (optind - last_nonopt);
- last_nonopt = optind;
- }
-
- /*
- * 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 `getopt' is called repeatedly, it
- * returns successively each of the option characters from each of the option
- * elements.
- *
- * If `getopt' finds another option character, it returns that character,
- * updating `optind' and `nextchar' so that the next call to `getopt' can
- * resume the scan with the following option character or ARGV-element.
- *
- * If there are no more option characters, `getopt' returns `EOF'. Then `optind'
- * is the index in ARGV of the first ARGV-element that is not an option.
- * (The ARGV-elements have been permuted so that those that are not options
- * now come last.)
- *
- * 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 `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 `optarg'. Two colons mean an option that
- * wants an optional arg; if there is text in the current ARGV-element, it is
- * returned in `optarg', otherwise `optarg' is set to zero.
- *
- * If OPTSTRING starts with `-' or `+', it requests different methods of
- * handling the non-option ARGV-elements. See the comments about
- * RETURN_IN_ORDER and REQUIRE_ORDER, above.
- *
- * Long-named options begin with `+' instead of `-'. Their names may be
- * abbreviated as long as the abbreviation is unique or is an exact match for
- * some defined option. If they have an argument, it follows the option name
- * in the same ARGV-element, separated from the option name by a `=', or else
- * the in next ARGV-element. When `getopt' finds a long-named option, it
- * returns 0 if that option's `flag' field is nonzero, the value of the
- * option's `val' field otherwise.
- */
-
- int
- getopt (argc, argv, optstring)
- int argc;
- char **argv;
- CONST char *optstring;
- {
- optarg = 0;
-
- /*
- * 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 (optind == 0)
- {
- first_nonopt = last_nonopt = optind = 1;
-
- nextchar = 0;
-
- /* Determine how to handle the ordering of options and nonoptions. */
-
- if (optstring[0] == '-')
- {
- ordering = RETURN_IN_ORDER;
- ++optstring;
- }
- else if (optstring[0] == '+')
- {
- ordering = REQUIRE_ORDER;
- ++optstring;
- }
- else if (getenv ("_POSIX_OPTION_ORDER") != 0)
- ordering = REQUIRE_ORDER;
- else
- ordering = PERMUTE;
- }
-
- if (nextchar == 0 || *nextchar == 0)
- {
- if (ordering == PERMUTE)
- {
- /*
- * If we have just processed some options following some
- * non-options, exchange them so that the options come first.
- */
-
- if (first_nonopt != last_nonopt && last_nonopt != optind)
- exchange (argv);
- else if (last_nonopt != optind)
- first_nonopt = optind;
-
- /*
- * Now skip any additional non-options and extend the range of
- * non-options previously skipped.
- */
-
- while (optind < argc
- && (argv[optind][0] != '-'
- || argv[optind][1] == 0)
- && (_getopt_long_options == 0
- || argv[optind][0] != '+'
- || argv[optind][1] == 0))
- optind++;
- last_nonopt = optind;
- }
-
- /*
- * Special ARGV-element `--' means premature end of options. Skip it
- * like a null option, then exchange with previous non-options as if it
- * were an option, then skip everything else like a non-option.
- */
-
- if (optind != argc && !strcmp (argv[optind], "--"))
- {
- optind++;
-
- if (first_nonopt != last_nonopt && last_nonopt != optind)
- exchange (argv);
- else if (first_nonopt == last_nonopt)
- first_nonopt = optind;
- last_nonopt = argc;
-
- optind = argc;
- }
-
- /*
- * If we have done all the ARGV-elements, stop the scan and back over
- * any non-options that we skipped and permuted.
- */
-
- if (optind == argc)
- {
- /*
- * Set the next-arg-index to point at the non-options that we
- * previously skipped, so the caller will digest them.
- */
- if (first_nonopt != last_nonopt)
- optind = first_nonopt;
- return EOF;
- }
-
- /*
- * If we have come to a non-option and did not permute it, either stop
- * the scan or describe it to the caller and pass it by.
- */
-
- if ((argv[optind][0] != '-' || argv[optind][1] == 0)
- && (_getopt_long_options == 0
- || argv[optind][0] != '+' || argv[optind][1] == 0))
- {
- if (ordering == REQUIRE_ORDER)
- return EOF;
- optarg = argv[optind++];
- return 1;
- }
-
- /*
- * We have found another option-ARGV-element. Start decoding its
- * characters.
- */
-
- nextchar = argv[optind] + 1;
- }
-
- if (_getopt_long_options != 0
- && (argv[optind][0] == '+'
- || (_getopt_long_only && argv[optind][0] == '-'))
- )
- {
- CONST struct option *p;
- char *s = nextchar;
- int exact = 0;
- int ambig = 0;
- CONST struct option *pfound = 0;
- int indfound;
-
- while (*s && *s != '=')
- s++;
-
- /* Test all options for either exact match or abbreviated matches. */
- for (p = _getopt_long_options, option_index = 0; p->name;
- p++, option_index++)
- if (!strncmp (p->name, nextchar, s - nextchar))
- {
- if (s - nextchar == strlen (p->name))
- {
- /* Exact match found. */
- pfound = p;
- indfound = option_index;
- exact = 1;
- break;
- }
- else if (pfound == 0)
- {
- /* First nonexact match found. */
- pfound = p;
- indfound = option_index;
- }
- else
- /* Second nonexact match found. */
- ambig = 1;
- }
-
- if (ambig && !exact)
- {
- fprintf (stderr, "%s: option `%s' is ambiguous\n",
- argv[0], argv[optind]);
- nextchar += strlen (nextchar);
- optind++;
- return '?';
- }
-
- if (pfound != 0)
- {
- option_index = indfound;
- optind++;
- if (*s)
- {
- if (pfound->has_arg > 0)
- optarg = s + 1;
- else
- {
- fprintf (stderr,
- "%s: option `%c%s' doesn't allow an argument\n",
- argv[0], argv[optind - 1][0], pfound->name);
- nextchar += strlen (nextchar);
- return '?';
- }
- }
- else if (pfound->has_arg == 1)
- {
- if (optind < argc)
- optarg = argv[optind++];
- else
- {
- fprintf (stderr, "%s: option `%s' requires an argument\n",
- argv[0], argv[optind - 1]);
- nextchar += strlen (nextchar);
- return '?';
- }
- }
- nextchar += strlen (nextchar);
- if (pfound->flag)
- {
- *(pfound->flag) = pfound->val;
- return 0;
- }
- return pfound->val;
- }
- /*
- * Can't find it as a long option. If this is getopt_long_only, and
- * the option starts with '-' and is a valid short option, then
- * interpret it as a short option. Otherwise it's an error.
- */
- if (_getopt_long_only == 0 || argv[optind][0] == '+' ||
- index (optstring, *nextchar) == 0)
- {
- if (opterr != 0)
- fprintf (stderr, "%s: unrecognized option `%c%s'\n",
- argv[0], argv[optind][0], nextchar);
- nextchar += strlen (nextchar);
- optind++;
- return '?';
- }
- }
-
- /* Look at and handle the next option-character. */
-
- {
- char c = *nextchar++;
- char *temp = index (optstring, c);
-
- /* Increment `optind' when we start to process its last character. */
- if (*nextchar == 0)
- optind++;
-
- if (temp == 0 || c == ':')
- {
- if (opterr != 0)
- {
- if (c < 040 || c >= 0177)
- fprintf (stderr, "%s: unrecognized option, character code 0%o\n",
- argv[0], c);
- else
- fprintf (stderr, "%s: unrecognized option `-%c'\n",
- argv[0], c);
- }
- return '?';
- }
- if (temp[1] == ':')
- {
- if (temp[2] == ':')
- {
- /* This is an option that accepts an argument optionally. */
- if (*nextchar != 0)
- {
- optarg = nextchar;
- optind++;
- }
- else
- optarg = 0;
- nextchar = 0;
- }
- else
- {
- /* This is an option that requires an argument. */
- if (*nextchar != 0)
- {
- optarg = nextchar;
- /*
- * If we end this ARGV-element by taking the rest as an arg,
- * we must advance to the next element now.
- */
- optind++;
- }
- else if (optind == argc)
- {
- if (opterr != 0)
- fprintf (stderr, "%s: option `-%c' requires an argument\n",
- argv[0], c);
- c = '?';
- }
- else
- /*
- * We already incremented `optind' once; increment it again
- * when taking next ARGV-elt as argument.
- */
- optarg = argv[optind++];
- nextchar = 0;
- }
- }
- return c;
- }
- }
-
- #ifdef TEST
-
- /*
- * Compile with -DTEST to make an executable for use in testing the above
- * definition of `getopt'.
- */
-
- int
- main (argc, argv)
- int argc;
- char **argv;
- {
- int c;
- int digit_optind = 0;
-
- while (1)
- {
- int this_option_optind = optind ? optind : 1;
-
- c = 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_optind != 0 && digit_optind != this_option_optind)
- printf ("digits occur in two different argv-elements.\n");
- digit_optind = this_option_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", optarg);
- break;
-
- case '?':
- break;
-
- default:
- printf ("?? getopt returned character code 0%o ??\n", c);
- }
- }
-
- if (optind < argc)
- {
- printf ("non-option ARGV-elements: ");
- while (optind < argc)
- printf ("%s ", argv[optind++]);
- printf ("\n");
- }
-
- exit (0);
- }
-
- #endif /* TEST */
-