ref: 02fe73d1f38b702b7a94a8b4934eb9e829eb4278
dir: /src/extern/getopt.c/
/*
* Copyright © 2005-2019 Rich Felker, et al.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* This implementation was taken from musl and modified for RGBDS */
#include <stddef.h>
#include <stdlib.h>
#include <limits.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include "extern/getopt.h"
int __optpos, __optreset;
void __getopt_msg(const char *a, const char *b, const char *c, size_t l)
{
FILE *f = stderr;
(void)(fputs(a, f)>=0
&& fwrite(b, strlen(b), 1, f)
&& fwrite(c, 1, l, f)==l
&& putc('\n', f));
}
static void permute(char **argv, int dest, int src)
{
char **av = (char **)argv;
char *tmp = av[src];
int i;
for (i=src; i>dest; i--)
av[i] = av[i-1];
av[dest] = tmp;
}
static int __getopt_long_core(int argc, char **argv, const char *optstring, const struct option *longopts, int *idx, int longonly);
static int __getopt_long(int argc, char **argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
{
int ret, skipped, resumed;
if (!optind || __optreset) {
__optreset = 0;
__optpos = 0;
optind = 1;
}
if (optind >= argc || !argv[optind]) return -1;
skipped = optind;
if (optstring[0] != '+' && optstring[0] != '-') {
int i;
for (i=optind; ; i++) {
if (i >= argc || !argv[i]) return -1;
if (argv[i][0] == '-' && argv[i][1]) break;
}
optind = i;
}
resumed = optind;
ret = __getopt_long_core(argc, argv, optstring, longopts, idx, longonly);
if (resumed > skipped) {
int i, cnt = optind-resumed;
for (i=0; i<cnt; i++)
permute(argv, skipped, optind-1);
optind = skipped + cnt;
}
return ret;
}
static int __getopt_long_core(int argc, char **argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
{
optarg = 0;
if (longopts && argv[optind][0] == '-' &&
((longonly && argv[optind][1] && argv[optind][1] != '-') ||
(argv[optind][1] == '-' && argv[optind][2])))
{
int colon = optstring[optstring[0]=='+'||optstring[0]=='-']==':';
int i, cnt, match;
char *arg, *opt, *start = argv[optind]+1;
for (cnt=i=0; longopts[i].name; i++) {
const char *name = longopts[i].name;
opt = start;
if (*opt == '-') opt++;
while (*opt && *opt != '=' && *opt == *name)
name++, opt++;
if (*opt && *opt != '=') continue;
arg = opt;
match = i;
if (!*name) {
cnt = 1;
break;
}
cnt++;
}
if (cnt==1 && longonly && arg-start == mblen(start, MB_LEN_MAX)) {
int l = arg-start;
for (i=0; optstring[i]; i++) {
int j;
for (j=0; j<l && start[j]==optstring[i+j]; j++);
if (j==l) {
cnt++;
break;
}
}
}
if (cnt==1) {
i = match;
opt = arg;
optind++;
if (*opt == '=') {
if (!longopts[i].has_arg) {
optopt = longopts[i].val;
if (colon || !opterr)
return '?';
__getopt_msg(argv[0],
": option does not take an argument: ",
longopts[i].name,
strlen(longopts[i].name));
return '?';
}
optarg = opt+1;
} else if (longopts[i].has_arg == required_argument) {
if (!(optarg = argv[optind])) {
optopt = longopts[i].val;
if (colon) return ':';
if (!opterr) return '?';
__getopt_msg(argv[0],
": option requires an argument: ",
longopts[i].name,
strlen(longopts[i].name));
return '?';
}
optind++;
}
if (idx) *idx = i;
if (longopts[i].flag) {
*longopts[i].flag = longopts[i].val;
return 0;
}
return longopts[i].val;
}
if (argv[optind][1] == '-') {
optopt = 0;
if (!colon && opterr)
__getopt_msg(argv[0], cnt ?
": option is ambiguous: " :
": unrecognized option: ",
argv[optind]+2,
strlen(argv[optind]+2));
optind++;
return '?';
}
}
return getopt(argc, argv, optstring);
}
int getopt_long_only(int argc, char **argv, const char *optstring, const struct option *longopts, int *idx)
{
return __getopt_long(argc, argv, optstring, longopts, idx, 1);
}