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/*
* getopt.c
*
* Simple POSIX getopt(), no GNU extensions...
*/
#include <stdint.h>
#include <unistd.h>
#include <string.h>
char *optarg;
int optind = 1;
int opterr, optopt;
static const char *__optptr;
int getopt(int argc, char *const *argv, const char *optstring)
{
const char *carg = argv[optind];
const char *osptr;
int opt;
/* We don't actually need argc */
(void)argc;
/* First, eliminate all non-option cases */
if (!carg || carg[0] != '-' || !carg[1]) {
return -1;
}
if (carg[1] == '-' && !carg[2]) {
optind++;
return -1;
}
if ((uintptr_t) (__optptr - carg) > (uintptr_t) strlen(carg))
__optptr = carg + 1; /* Someone frobbed optind, change to new opt. */
opt = *__optptr++;
if (opt != ':' && (osptr = strchr(optstring, opt))) {
if (osptr[1] == ':') {
if (*__optptr) {
/* Argument-taking option with attached argument */
optarg = (char *)__optptr;
optind++;
} else {
/* Argument-taking option with non-attached argument */
if (argv[optind + 1]) {
optarg = (char *)argv[optind + 1];
optind += 2;
} else {
/* Missing argument */
return (optstring[0] == ':') ? ':' : '?';
}
}
return opt;
} else {
/* Non-argument-taking option */
/* __optptr will remember the exact position to resume at */
if (!*__optptr)
optind++;
return opt;
}
} else {
/* Unknown option */
optopt = opt;
if (!*__optptr)
optind++;
return '?';
}
}
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