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123 lines
3.9 KiB
123 lines
3.9 KiB
/* |
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* Copyright (c) 1987, 1993, 1994 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* This product includes software developed by the University of |
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* California, Berkeley and its contributors. |
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* 4. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#if defined(LIBC_SCCS) && !defined(lint) |
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static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; |
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#endif /* LIBC_SCCS and not lint */ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "getopt.h" |
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int opterr = 1, /* if error message should be printed */ |
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optind = 1, /* index into parent argv vector */ |
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optopt, /* character checked for validity */ |
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optreset; /* reset getopt */ |
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char *optarg; /* argument associated with option */ |
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#define BADCH (int)'?' |
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#define BADARG (int)':' |
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#define EMSG "" |
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/* |
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* getopt -- |
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* Parse argc/argv argument vector. |
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*/ |
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int |
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getopt(int nargc, char * const *nargv, const char *ostr) |
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{ |
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char *cp; |
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static char *__progname; |
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static char *place = EMSG; /* option letter processing */ |
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char *oli; /* option letter list index */ |
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if (__progname == NULL) { |
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if ((cp = strrchr(nargv[0], '/')) != NULL) |
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__progname = cp + 1; |
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else |
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__progname = nargv[0]; |
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} |
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if (optreset || !*place) { /* update scanning pointer */ |
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optreset = 0; |
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if (optind >= nargc || *(place = nargv[optind]) != '-') { |
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place = EMSG; |
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return (-1); |
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} |
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if (place[1] && *++place == '-') { /* found "--" */ |
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++optind; |
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place = EMSG; |
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return (-1); |
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} |
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} /* option letter okay? */ |
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if ((optopt = (int)*place++) == (int)':' || |
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!(oli = strchr(ostr, optopt))) { |
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/* |
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* if the user didn't specify '-' as an option, |
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* assume it means -1. |
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*/ |
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if (optopt == (int)'-') |
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return (-1); |
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if (!*place) |
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++optind; |
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if (opterr && *ostr != ':') |
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(void)fprintf(stderr, |
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"%s: illegal option -- %c\n", __progname, optopt); |
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return (BADCH); |
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} |
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if (*++oli != ':') { /* don't need argument */ |
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optarg = NULL; |
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if (!*place) |
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++optind; |
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} |
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else { /* need an argument */ |
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if (*place) /* no white space */ |
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optarg = place; |
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else if (nargc <= ++optind) { /* no arg */ |
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place = EMSG; |
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if (*ostr == ':') |
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return (BADARG); |
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if (opterr) |
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(void)fprintf(stderr, |
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"%s: option requires an argument -- %c\n", |
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__progname, optopt); |
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return (BADCH); |
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} |
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else /* white space */ |
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optarg = nargv[optind]; |
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place = EMSG; |
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++optind; |
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} |
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return (optopt); /* dump back option letter */ |
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}
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