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-rw-r--r--newlib/libc/stdlib/getopt.c479
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diff --git a/newlib/libc/stdlib/getopt.c b/newlib/libc/stdlib/getopt.c
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-/****************************************************************************
-
-getopt.c - Read command line options
-
-AUTHOR: Gregory Pietsch
-CREATED Fri Jan 10 21:13:05 1997
-
-DESCRIPTION:
-
-The getopt() function parses the command line arguments. Its arguments argc
-and argv are the argument count and array as passed to the main() function
-on program invocation. The argument optstring is a list of available option
-characters. If such a character is followed by a colon (`:'), the option
-takes an argument, which is placed in optarg. If such a character is
-followed by two colons, the option takes an optional argument, which is
-placed in optarg. If the option does not take an argument, optarg is NULL.
-
-The external variable optind is the index of the next array element of argv
-to be processed; it communicates from one call to the next which element to
-process.
-
-The getopt_long() function works like getopt() except that it also accepts
-long options started by two dashes `--'. If these take values, it is either
-in the form
-
---arg=value
-
- or
-
---arg value
-
-It takes the additional arguments longopts which is a pointer to the first
-element of an array of type struct option. The last element of the array
-has to be filled with NULL for the name field.
-
-The longind pointer points to the index of the current long option relative
-to longopts if it is non-NULL.
-
-The getopt() function returns the option character if the option was found
-successfully, `:' if there was a missing parameter for one of the options,
-`?' for an unknown option character, and EOF for the end of the option list.
-
-The getopt_long() function's return value is described in the header file.
-
-The function getopt_long_only() is identical to getopt_long(), except that a
-plus sign `+' can introduce long options as well as `--'.
-
-The following describes 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 POSIXLY_CORRECT 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
-POSIXLY_CORRECT, or using `+' as the first character of the optstring
-parameter.
-
-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 optstring parameter 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() and friends to return EOF with optind != argc.
-
-COPYRIGHT NOTICE AND DISCLAIMER:
-
-Copyright (C) 1997 Gregory Pietsch
-
-This file and the accompanying getopt.h header file are hereby placed in the
-public domain without restrictions. Just give the author credit, don't
-claim you wrote it or prevent anyone else from using it.
-
-Gregory Pietsch's current e-mail address:
-gpietsch@comcast.net
-****************************************************************************/
-
-#ifndef HAVE_GETOPT
-
-/* include files */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#define __need_getopt_newlib
-#include <getopt.h>
-
-/* macros */
-
-/* types */
-typedef enum GETOPT_ORDERING_T
-{
- PERMUTE,
- RETURN_IN_ORDER,
- REQUIRE_ORDER
-} GETOPT_ORDERING_T;
-
-/* globally-defined variables */
-char *optarg = 0;
-int optind = 0;
-int opterr = 1;
-int optopt = '?';
-
-/* static variables */
-static int optwhere = 0;
-
-/* functions */
-
-/* reverse_argv_elements: reverses num elements starting at argv */
-static void
-reverse_argv_elements (char **argv, int num)
-{
- int i;
- char *tmp;
-
- for (i = 0; i < (num >> 1); i++)
- {
- tmp = argv[i];
- argv[i] = argv[num - i - 1];
- argv[num - i - 1] = tmp;
- }
-}
-
-/* permute: swap two blocks of argv-elements given their lengths */
-static void
-permute (char *const argv[], int len1, int len2)
-{
- reverse_argv_elements ((char **) argv, len1);
- reverse_argv_elements ((char **) argv, len1 + len2);
- reverse_argv_elements ((char **) argv, len2);
-}
-
-/* is_option: is this argv-element an option or the end of the option list? */
-static int
-is_option (char *argv_element, int only)
-{
- return ((argv_element == 0)
- || (argv_element[0] == '-') || (only && argv_element[0] == '+'));
-}
-
-/* read_globals: read the values from the globals into a getopt_data
- structure */
-static void
-read_globals (struct getopt_data *data)
-{
- data->optarg = optarg;
- data->optind = optind;
- data->opterr = opterr;
- data->optopt = optopt;
- data->optwhere = optwhere;
-}
-
-/* write_globals: write the values into the globals from a getopt_data
- structure */
-static void
-write_globals (struct getopt_data *data)
-{
- optarg = data->optarg;
- optind = data->optind;
- opterr = data->opterr;
- optopt = data->optopt;
- optwhere = data->optwhere;
-}
-
-/* getopt_internal: the function that does all the dirty work */
-static int
-getopt_internal (int argc, char *const argv[], const char *shortopts,
- const struct option *longopts, int *longind, int only,
- struct getopt_data *data)
-{
- GETOPT_ORDERING_T ordering = PERMUTE;
- size_t permute_from = 0;
- int num_nonopts = 0;
- int optindex = 0;
- size_t match_chars = 0;
- char *possible_arg = 0;
- int longopt_match = -1;
- int has_arg = -1;
- char *cp = 0;
- int arg_next = 0;
-
- /* first, deal with silly parameters and easy stuff */
- if (argc == 0 || argv == 0 || (shortopts == 0 && longopts == 0)
- || data->optind >= argc || argv[data->optind] == 0)
- return EOF;
- if (strcmp (argv[data->optind], "--") == 0)
- {
- data->optind++;
- return EOF;
- }
-
- /* if this is our first time through */
- if (data->optind == 0)
- data->optind = data->optwhere = 1;
-
- /* define ordering */
- if (shortopts != 0 && (*shortopts == '-' || *shortopts == '+'))
- {
- ordering = (*shortopts == '-') ? RETURN_IN_ORDER : REQUIRE_ORDER;
- shortopts++;
- }
- else
- ordering = (getenv ("POSIXLY_CORRECT") != 0) ? REQUIRE_ORDER : PERMUTE;
-
- /*
- * based on ordering, find our next option, if we're at the beginning of
- * one
- */
- if (data->optwhere == 1)
- {
- switch (ordering)
- {
- default: /* shouldn't happen */
- case PERMUTE:
- permute_from = data->optind;
- num_nonopts = 0;
- while (!is_option (argv[data->optind], only))
- {
- data->optind++;
- num_nonopts++;
- }
- if (argv[data->optind] == 0)
- {
- /* no more options */
- data->optind = permute_from;
- return EOF;
- }
- else if (strcmp (argv[data->optind], "--") == 0)
- {
- /* no more options, but have to get `--' out of the way */
- permute (argv + permute_from, num_nonopts, 1);
- data->optind = permute_from + 1;
- return EOF;
- }
- break;
- case RETURN_IN_ORDER:
- if (!is_option (argv[data->optind], only))
- {
- data->optarg = argv[data->optind++];
- return (data->optopt = 1);
- }
- break;
- case REQUIRE_ORDER:
- if (!is_option (argv[data->optind], only))
- return EOF;
- break;
- }
- }
- /* we've got an option, so parse it */
-
- /* first, is it a long option? */
- if (longopts != 0
- && (memcmp (argv[data->optind], "--", 2) == 0
- || (only && argv[data->optind][0] == '+')) && data->optwhere == 1)
- {
- /* handle long options */
- if (memcmp (argv[data->optind], "--", 2) == 0)
- data->optwhere = 2;
- longopt_match = -1;
- possible_arg = strchr (argv[data->optind] + data->optwhere, '=');
- if (possible_arg == 0)
- {
- /* no =, so next argv might be arg */
- match_chars = strlen (argv[data->optind]);
- possible_arg = argv[data->optind] + match_chars;
- match_chars = match_chars - data->optwhere;
- }
- else
- match_chars = (possible_arg - argv[data->optind]) - data->optwhere;
- for (optindex = 0; longopts[optindex].name != 0; ++optindex)
- {
- if (memcmp
- (argv[data->optind] + data->optwhere, longopts[optindex].name,
- match_chars) == 0)
- {
- /* do we have an exact match? */
- if (match_chars == (int) (strlen (longopts[optindex].name)))
- {
- longopt_match = optindex;
- break;
- }
- /* do any characters match? */
- else
- {
- if (longopt_match < 0)
- longopt_match = optindex;
- else
- {
- /* we have ambiguous options */
- if (data->opterr)
- fprintf (stderr, "%s: option `%s' is ambiguous "
- "(could be `--%s' or `--%s')\n",
- argv[0],
- argv[data->optind],
- longopts[longopt_match].name,
- longopts[optindex].name);
- return (data->optopt = '?');
- }
- }
- }
- }
- if (longopt_match >= 0)
- has_arg = longopts[longopt_match].has_arg;
- }
-
- /* if we didn't find a long option, is it a short option? */
- if (longopt_match < 0 && shortopts != 0)
- {
- cp = strchr (shortopts, argv[data->optind][data->optwhere]);
- if (cp == 0)
- {
- /* couldn't find option in shortopts */
- if (data->opterr)
- fprintf (stderr,
- "%s: invalid option -- `-%c'\n",
- argv[0], argv[data->optind][data->optwhere]);
- data->optwhere++;
- if (argv[data->optind][data->optwhere] == '\0')
- {
- data->optind++;
- data->optwhere = 1;
- }
- return (data->optopt = '?');
- }
- has_arg = ((cp[1] == ':')
- ? ((cp[2] == ':') ? OPTIONAL_ARG : REQUIRED_ARG) : NO_ARG);
- possible_arg = argv[data->optind] + data->optwhere + 1;
- data->optopt = *cp;
- }
-
- /* get argument and reset data->optwhere */
- arg_next = 0;
- switch (has_arg)
- {
- case OPTIONAL_ARG:
- if (*possible_arg == '=')
- possible_arg++;
- data->optarg = (*possible_arg != '\0') ? possible_arg : 0;
- data->optwhere = 1;
- break;
- case REQUIRED_ARG:
- if (*possible_arg == '=')
- possible_arg++;
- if (*possible_arg != '\0')
- {
- data->optarg = possible_arg;
- data->optwhere = 1;
- }
- else if (data->optind + 1 >= argc)
- {
- if (data->opterr)
- {
- fprintf (stderr, "%s: argument required for option `", argv[0]);
- if (longopt_match >= 0)
- fprintf (stderr, "--%s'\n", longopts[longopt_match].name);
- else
- fprintf (stderr, "-%c'\n", *cp);
- }
- data->optind++;
- return (data->optopt = ':');
- }
- else
- {
- data->optarg = argv[data->optind + 1];
- arg_next = 1;
- data->optwhere = 1;
- }
- break;
- default: /* shouldn't happen */
- case NO_ARG:
- if (longopt_match < 0)
- {
- data->optwhere++;
- if (argv[data->optind][data->optwhere] == '\0')
- data->optwhere = 1;
- }
- else
- data->optwhere = 1;
- data->optarg = 0;
- break;
- }
-
- /* do we have to permute or otherwise modify data->optind? */
- if (ordering == PERMUTE && data->optwhere == 1 && num_nonopts != 0)
- {
- permute (argv + permute_from, num_nonopts, 1 + arg_next);
- data->optind = permute_from + 1 + arg_next;
- }
- else if (data->optwhere == 1)
- data->optind = data->optind + 1 + arg_next;
-
- /* finally return */
- if (longopt_match >= 0)
- {
- if (longind != 0)
- *longind = longopt_match;
- if (longopts[longopt_match].flag != 0)
- {
- *(longopts[longopt_match].flag) = longopts[longopt_match].val;
- return 0;
- }
- else
- return longopts[longopt_match].val;
- }
- else
- return data->optopt;
-}
-
-int
-getopt (int argc, char *const argv[], const char *optstring)
-{
- struct getopt_data data;
- int r;
-
- read_globals (&data);
- r = getopt_internal (argc, argv, optstring, 0, 0, 0, &data);
- write_globals (&data);
- return r;
-}
-
-int
-getopt_long (int argc, char *const argv[], const char *shortopts,
- const struct option *longopts, int *longind)
-{
- struct getopt_data data;
- int r;
-
- read_globals (&data);
- r = getopt_internal (argc, argv, shortopts, longopts, longind, 0, &data);
- write_globals (&data);
- return r;
-}
-
-int
-getopt_long_only (int argc, char *const argv[], const char *shortopts,
- const struct option *longopts, int *longind)
-{
- struct getopt_data data;
- int r;
-
- read_globals (&data);
- r = getopt_internal (argc, argv, shortopts, longopts, longind, 1, &data);
- write_globals (&data);
- return r;
-}
-
-int
-__getopt_r (int argc, char *const argv[], const char *optstring,
- struct getopt_data *data)
-{
- return getopt_internal (argc, argv, optstring, 0, 0, 0, data);
-}
-
-int
-__getopt_long_r (int argc, char *const argv[], const char *shortopts,
- const struct option *longopts, int *longind,
- struct getopt_data *data)
-{
- return getopt_internal (argc, argv, shortopts, longopts, longind, 0, data);
-}
-
-int
-__getopt_long_only_r (int argc, char *const argv[], const char *shortopts,
- const struct option *longopts, int *longind,
- struct getopt_data *data)
-{
- return getopt_internal (argc, argv, shortopts, longopts, longind, 1, data);
-}
-
-#endif /* !HAVE_GETOPT */
-
-/* end of file GETOPT.C */
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