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/* $OpenBSD: getopt-test.c,v 1.1 2020/03/23 03:01:21 schwarze Exp $ */
/*
* Copyright (c) 2020 Ingo Schwarze <schwarze@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/*
* Process command line options and arguments according to the
* optstring in the environment variable OPTS. Write:
* OPT(c) for an option "-c" without an option argument
* OPT(carg) for an option "-c" with an option argument "arg"
* ARG(arg) for a non-option argument "arg"
* NONE(arg) for a non-option argument "arg" processed with OPTS =~ ^-
* ERR(?c) for an invalid option "-c", or one lacking an argument
* ERR(:c) for an option "-c" lacking an argument while OPTS =~ ^:
*/
int
main(int argc, char *argv[])
{
char *optstring;
int ch;
if ((optstring = getenv("OPTS")) == NULL)
optstring = "";
opterr = 0;
while ((ch = getopt(argc, argv, optstring)) != -1) {
switch (ch) {
case '\1':
printf("NONE(%s)", optarg);
break;
case ':':
case '?':
printf("ERR(%c%c)", ch, optopt);
break;
default:
printf("OPT(%c%s)", ch, optarg == NULL ? "" : optarg);
break;
}
}
while (optind < argc)
printf("ARG(%s)", argv[optind++]);
putchar('\n');
return 0;
}
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