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-rw-r--r--src/getopt.c413
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diff --git a/src/getopt.c b/src/getopt.c
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-/* Getopt for GNU.
- Copyright (C) 1987, 1989 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 1, 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. */
-
-
-
-/* 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>
-
-#ifdef sparc
-#include <alloca.h>
-#endif
-#ifdef USG
-#define bcopy(s, d, l) memcpy((d), (s), (l))
-#endif
-
-/* 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.
-
- UNSPECIFIED means the caller did not specify anything;
- the default is then REQUIRE_ORDER if the environment variable
- _OPTIONS_FIRST 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.
-
- PERMUTE is the default. We permute the contents of `argv' as we scan,
- so that eventually all the 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 zero.
- Using `-' as the first character of the list of option characters
- requests 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;
-
-/* 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 theoption 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.
- A colon in OPTSTRING means that the previous character is an option
- that wants an argument. The argument is taken from the rest of the
- current ARGV-element, or from the following ARGV-element,
- and returned in `optarg'.
-
- 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'.
-
- If OPTSTRING starts with `-', it requests a different method of handling the
- non-option ARGV-elements. See the comments about RETURN_IN_ORDER, above. */
-
-int
-getopt (argc, argv, optstring)
- int argc;
- char **argv;
- char *optstring;
-{
- /* 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;
- 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))
- 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)
- {
- if (ordering == REQUIRE_ORDER)
- return EOF;
- optarg = argv[optind++];
- return 0;
- }
-
- /* We have found another option-ARGV-element.
- Start decoding its characters. */
-
- nextchar = argv[optind] + 1;
- }
-
- /* Look at and handle the next option-character. */
-
- {
- char c = *nextchar++;
- char *temp = (char *) 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: no argument for `-%c' option\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;
-{
- char c;
- int digit_optind = 0;
-
- while (1)
- {
- int this_option_optind = optind;
- if ((c = getopt (argc, argv, "abc:d:0123456789")) == 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");
- }
-
- return 0;
-}
-
-#endif /* TEST */