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/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* getopt function definitions for NOLIBC, adapted from musl libc
* Copyright (C) 2005-2020 Rich Felker, et al.
* Copyright (C) 2025 Thomas Weißschuh <linux@weissschuh.net>
*/
/* make sure to include all global symbols */
#include "nolibc.h"
#ifndef _NOLIBC_GETOPT_H
#define _NOLIBC_GETOPT_H
struct FILE;
static struct FILE *const stderr;
static int fprintf(struct FILE *stream, const char *fmt, ...);
__attribute__((weak,unused,section(".data.nolibc_getopt")))
char *optarg;
__attribute__((weak,unused,section(".data.nolibc_getopt")))
int optind = 1, opterr = 1, optopt;
static __attribute__((unused))
int getopt(int argc, char * const argv[], const char *optstring)
{
static int __optpos;
int i;
char c, d;
char *optchar;
if (!optind) {
__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])
return optind++, -1;
if (!__optpos)
__optpos++;
c = argv[optind][__optpos];
optchar = argv[optind] + __optpos;
__optpos++;
if (!argv[optind][__optpos]) {
optind++;
__optpos = 0;
}
if (optstring[0] == '-' || optstring[0] == '+')
optstring++;
i = 0;
d = 0;
do {
d = optstring[i++];
} while (d && d != c);
if (d != c || c == ':') {
optopt = c;
if (optstring[0] != ':' && opterr)
fprintf(stderr, "%s: unrecognized option: %c\n", argv[0], *optchar);
return '?';
}
if (optstring[i] == ':') {
optarg = 0;
if (optstring[i + 1] != ':' || __optpos) {
optarg = argv[optind++];
if (__optpos)
optarg += __optpos;
__optpos = 0;
}
if (optind > argc) {
optopt = c;
if (optstring[0] == ':')
return ':';
if (opterr)
fprintf(stderr, "%s: option requires argument: %c\n",
argv[0], *optchar);
return '?';
}
}
return c;
}
#endif /* _NOLIBC_GETOPT_H */
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