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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* getopt.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "compat.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#ifndef HAVE_GETOPT
static char *current = "";
int optind = 1;
char *optarg = NULL;
int getopt(int argc, char *const argv[], const char *optstr)
{
char optchr, *ptr;
if (*current == '\0') {
if (optind >= argc || argv[optind][0] != '-')
return -1;
if (argv[optind][1] == '-' && argv[optind][2] == '\0') {
++optind;
return -1;
}
if (argv[optind][1] == '\0')
return -1;
current = argv[optind] + 1;
}
optchr = *(current++);
if (optchr == ':' || (ptr = strchr(optstr, optchr)) == NULL)
goto fail_unknown;
if (ptr[1] == ':') {
if (*current != '\0') {
optarg = current;
} else {
if (++optind >= argc)
goto fail_arg;
optarg = argv[optind];
}
current = "";
++optind;
} else {
optarg = NULL;
if (*current == '\0')
++optind;
}
return optchr;
fail_unknown:
fprintf(stderr, "%s: unknown option `-%c`\n", argv[0], optchr);
return '?';
fail_arg:
fprintf(stderr, "%s: missing argument for option `-%c`\n",
argv[0], optchr);
return '?';
}
#endif
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