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Diffstat (limited to 'newlib/libc/stdlib/getopt.c')
| -rw-r--r-- | newlib/libc/stdlib/getopt.c | 503 |
1 files changed, 107 insertions, 396 deletions
diff --git a/newlib/libc/stdlib/getopt.c b/newlib/libc/stdlib/getopt.c index 10002ed6b..b38938d5f 100644 --- a/newlib/libc/stdlib/getopt.c +++ b/newlib/libc/stdlib/getopt.c @@ -1,406 +1,117 @@ -/**************************************************************************** +/* + * Copyright (c) 1987, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +/* static char sccsid[] = "from: @(#)getopt.c 8.2 (Berkeley) 4/2/94"; */ +static char *rcsid = "$Id$"; +#endif /* LIBC_SCCS and not lint */ -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 -****************************************************************************/ - -/* include files */ #include <stdio.h> #include <stdlib.h> #include <string.h> -#include <getopt.h> -/* macros */ +int opterr = 1, /* if error message should be printed */ + optind = 1, /* index into parent argv vector */ + optopt, /* character checked for validity */ + optreset; /* reset getopt */ +char *optarg; /* argument associated with option */ -/* types */ -typedef enum GETOPT_ORDERING_T -{ - PERMUTE, - RETURN_IN_ORDER, - REQUIRE_ORDER -} GETOPT_ORDERING_T; - -/* globally-defined variables */ -char *optarg = NULL; -int optind = 0; -int opterr = 1; -int optopt = '?'; - -/* 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 == NULL) - || (argv_element[0] == '-') || (only && argv_element[0] == '+')); -} - -/* 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) -{ - GETOPT_ORDERING_T ordering = PERMUTE; - static size_t optwhere = 0; - size_t permute_from = 0; - int num_nonopts = 0; - int optindex = 0; - size_t match_chars = 0; - char *possible_arg = NULL; - int longopt_match = -1; - int has_arg = -1; - char *cp; - int arg_next = 0; - - /* first, deal with silly parameters and easy stuff */ - if (argc == 0 || argv == NULL || (shortopts == NULL && longopts == NULL)) - return EOF; - if (optind >= argc || argv[optind] == NULL) - return EOF; - if (strcmp (argv[optind], "--") == 0) - { - optind++; - return EOF; - } - /* if this is our first time through */ - if (optind == 0) - optind = optwhere = 1; - - /* define ordering */ - if (shortopts != NULL && (*shortopts == '-' || *shortopts == '+')) - { - ordering = (*shortopts == '-') ? RETURN_IN_ORDER : REQUIRE_ORDER; - shortopts++; - } - else - ordering = (getenv ("POSIXLY_CORRECT") != NULL) ? REQUIRE_ORDER : PERMUTE; - - /* - * based on ordering, find our next option, if we're at the beginning of - * one - */ - if (optwhere == 1) - { - switch (ordering) - { - case PERMUTE: - permute_from = optind; - num_nonopts = 0; - while (!is_option (argv[optind], only)) - { - optind++; - num_nonopts++; - } - if (argv[optind] == NULL) - { - /* no more options */ - optind = permute_from; - return EOF; - } - else if (strcmp (argv[optind], "--") == 0) - { - /* no more options, but have to get `--' out of the way */ - permute (argv + permute_from, num_nonopts, 1); - optind = permute_from + 1; - return EOF; - } - break; - case RETURN_IN_ORDER: - if (!is_option (argv[optind], only)) - { - optarg = argv[optind++]; - return (optopt = 1); - } - break; - case REQUIRE_ORDER: - if (!is_option (argv[optind], only)) - return EOF; - break; - } - } - /* we've got an option, so parse it */ - - /* first, is it a long option? */ - if (longopts != NULL - && (memcmp (argv[optind], "--", 2) == 0 - || (only && argv[optind][0] == '+')) && optwhere == 1) - { - /* handle long options */ - if (memcmp (argv[optind], "--", 2) == 0) - optwhere = 2; - longopt_match = -1; - possible_arg = strchr (argv[optind] + optwhere, '='); - if (possible_arg == NULL) - { - /* no =, so next argv might be arg */ - match_chars = strlen (argv[optind]); - possible_arg = argv[optind] + match_chars; - match_chars = match_chars - optwhere; - } - else - match_chars = (possible_arg - argv[optind]) - optwhere; - for (optindex = 0; longopts[optindex].name != NULL; optindex++) - { - if (memcmp (argv[optind] + 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 (opterr) - fprintf (stderr, "%s: option `%s' is ambiguous " - "(could be `--%s' or `--%s')\n", - argv[0], - argv[optind], - longopts[longopt_match].name, - longopts[optindex].name); - return (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 != NULL) - { - cp = strchr (shortopts, argv[optind][optwhere]); - if (cp == NULL) - { - /* couldn't find option in shortopts */ - if (opterr) - fprintf (stderr, - "%s: invalid option -- `-%c'\n", - argv[0], argv[optind][optwhere]); - optwhere++; - if (argv[optind][optwhere] == '\0') - { - optind++; - optwhere = 1; - } - return (optopt = '?'); - } - has_arg = ((cp[1] == ':') - ? ((cp[2] == ':') ? OPTIONAL_ARG : REQUIRED_ARG) : NO_ARG); - possible_arg = argv[optind] + optwhere + 1; - optopt = *cp; - } - /* get argument and reset optwhere */ - arg_next = 0; - switch (has_arg) - { - case OPTIONAL_ARG: - if (*possible_arg == '=') - possible_arg++; - if (*possible_arg != '\0') - { - optarg = possible_arg; - optwhere = 1; - } - else - optarg = NULL; - break; - case REQUIRED_ARG: - if (*possible_arg == '=') - possible_arg++; - if (*possible_arg != '\0') - { - optarg = possible_arg; - optwhere = 1; - } - else if (optind + 1 >= argc) - { - if (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); - } - optind++; - return (optopt = ':'); - } - else - { - optarg = argv[optind + 1]; - arg_next = 1; - optwhere = 1; - } - break; - case NO_ARG: - if (longopt_match < 0) - { - optwhere++; - if (argv[optind][optwhere] == '\0') - optwhere = 1; - } - else - optwhere = 1; - optarg = NULL; - break; - } - - /* do we have to permute or otherwise modify optind? */ - if (ordering == PERMUTE && optwhere == 1 && num_nonopts != 0) - { - permute (argv + permute_from, num_nonopts, 1 + arg_next); - optind = permute_from + 1 + arg_next; - } - else if (optwhere == 1) - optind = optind + 1 + arg_next; - - /* finally return */ - if (longopt_match >= 0) - { - if (longind != NULL) - *longind = longopt_match; - if (longopts[longopt_match].flag != NULL) - { - *(longopts[longopt_match].flag) = longopts[longopt_match].val; - return 0; - } - else - return longopts[longopt_match].val; - } - else - return optopt; -} +#define BADCH (int)'?' +#define BADARG (int)':' +#define EMSG "" +/* + * getopt -- + * Parse argc/argv argument vector. + */ int -getopt (int argc, char *const argv[], const char *optstring) +getopt(nargc, nargv, ostr) + int nargc; + char * const *nargv; + const char *ostr; { - return getopt_internal (argc, argv, optstring, NULL, NULL, 0); + static char *place = EMSG; /* option letter processing */ + char *oli; /* option letter list index */ + + if (optreset || !*place) { /* update scanning pointer */ + optreset = 0; + if (optind >= nargc || *(place = nargv[optind]) != '-') { + place = EMSG; + return (-1); + } + if (place[1] && *++place == '-') { /* found "--" */ + ++optind; + place = EMSG; + return (-1); + } + } /* option letter okay? */ + if ((optopt = (int)*place++) == (int)':' || + !(oli = strchr(ostr, optopt))) { + /* + * if the user didn't specify '-' as an option, + * assume it means -1. + */ + if (optopt == (int)'-') + return (-1); + if (!*place) + ++optind; + if (opterr && *ostr != ':') + (void)fprintf(stderr, + "%s: illegal option -- %c\n", nargv[0], optopt); + return (BADCH); + } + if (*++oli != ':') { /* don't need argument */ + optarg = NULL; + if (!*place) + ++optind; + } + else { /* need an argument */ + if (*place) /* no white space */ + optarg = place; + else if (nargc <= ++optind) { /* no arg */ + place = EMSG; + if (*ostr == ':') + return (BADARG); + if (opterr) + (void)fprintf(stderr, + "%s: option requires an argument -- %c\n", + nargv[0], optopt); + return (BADCH); + } + else /* white space */ + optarg = nargv[optind]; + place = EMSG; + ++optind; + } + return (optopt); /* dump back option letter */ } - -int -getopt_long (int argc, char *const argv[], const char *shortopts, - const struct option *longopts, int *longind) -{ - return getopt_internal (argc, argv, shortopts, longopts, longind, 0); -} - -int -getopt_long_only (int argc, char *const argv[], const char *shortopts, - const struct option *longopts, int *longind) -{ - return getopt_internal (argc, argv, shortopts, longopts, longind, 1); -} - -/* end of file GETOPT.C */ |