mirror of
https://github.com/Mercury-Language/mercury.git
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34bfc9e847
getopt/getopt.c:
Make getopt produce messages with `this' quoting style,
matching the rest of the Mercury system.
121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
/*
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Copyright © 2005-2014 Rich Felker, et al.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <string.h>
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#include <stdio.h>
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#define GETOPT_IMPL
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#include "getopt.h"
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char *optarg;
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int optind=1, opterr=1, optopt, __optpos, optreset=0;
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#define optpos __optpos
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void __getopt_msg(const char *a, const char *b, const char *c, size_t l)
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{
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FILE *f = stderr;
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if (
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fputs(a, f)>=0
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&& fwrite(b, strlen(b), 1, f)
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&& putc('`', f)
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&& fwrite(c, 1, l, f)==l
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&& fputs("'\n", f)>=0
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) { }
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}
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int getopt(int argc, char * const argv[], const char *optstring)
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{
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int i;
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int c, d;
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int k, l;
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char *optchar;
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if (!optind || optreset) {
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optreset = 0;
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__optpos = 0;
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optind = 1;
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}
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if (optind >= argc || !argv[optind])
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return -1;
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if (argv[optind][0] != '-') {
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if (optstring[0] == '-') {
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optarg = argv[optind++];
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return 1;
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}
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return -1;
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}
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if (!argv[optind][1])
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return -1;
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if (argv[optind][1] == '-' && !argv[optind][2])
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return optind++, -1;
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if (!optpos) optpos++;
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c = argv[optind][optpos];
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k = 1;
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optchar = argv[optind]+optpos;
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optpos += k;
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if (!argv[optind][optpos]) {
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optind++;
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optpos = 0;
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}
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if (optstring[0] == '-' || optstring[0] == '+')
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optstring++;
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i = 0;
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d = 0;
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do {
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d = optstring[i];
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l = d ? 1 : 0;
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if (l>0) i+=l; else i++;
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} while (l && d != c);
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if (d != c || c == ':') {
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optopt = c;
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if (optstring[0] != ':' && opterr)
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__getopt_msg(argv[0], ": unrecognized option: ", optchar, k);
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return '?';
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}
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if (optstring[i] == ':') {
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optarg = 0;
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if (optstring[i+1] != ':' || optpos) {
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optarg = argv[optind++] + optpos;
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optpos = 0;
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}
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if (optind > argc) {
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optopt = c;
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if (optstring[0] == ':') return ':';
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if (opterr) __getopt_msg(argv[0],
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": option requires an argument: ",
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optchar, k);
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return '?';
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}
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}
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return c;
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}
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