scoutos / prex-0.9.0 / usr / lib / libc / stdlib / getopt.c @ 03e9c04a
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/*
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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. 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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#include <unistd.h> |
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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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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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#if 0
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extern char *__progname;
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#endif
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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 (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 0
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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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#endif
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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 0
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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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#endif
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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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} |