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getopt.c
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getopt.c
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/*
* Copyright © 2005-2014 Rich Felker, et al.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "getopt.h"
char *optarg;
int optind = 1, opterr = 1, optopt;
static int optpos;
int getopt(int argc, char * const argv[], const char *optstring)
{
if (optind < 1) {
optpos = 0;
optind = 1;
}
if (optind >= argc || !argv[optind])
return -1;
if (argv[optind][0] != '-') {
if (optstring[0] == '-') {
optarg = argv[optind++];
return 1;
}
return -1;
}
if (!argv[optind][1])
return -1;
if (argv[optind][1] == '-' && !argv[optind][2]) {
optind++;
return -1;
}
if (!optpos)
optpos++;
optopt = argv[optind][optpos++];
if (!argv[optind][optpos]) {
optind++;
optpos = 0;
}
if (optstring[0] == '-' || optstring[0] == '+')
optstring++;
char *p = strchr(optstring, optopt);
if (!p) {
if (optstring[0] != ':' && opterr)
fprintf(stderr, "%s: unrecognized option: %c\n", argv[0], optopt);
return '?';
}
if (p[1] == ':') {
if (p[2] == ':') {
optarg = NULL;
} else if (optind >= argc) {
if (optstring[0] == ':')
return ':';
if (opterr)
fprintf(stderr, "%s: option requires an argument: %c\n", argv[0], optopt);
return '?';
}
if (p[2] != ':' || optpos) {
optarg = argv[optind++] + optpos;
optpos = 0;
}
}
return optopt;
}