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Add musl getopt_long() source files to project
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Copied verbatim from musl 1.2.2.

https://www.musl-libc.org
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@randstr
randstr committed Sep 16, 2021
1 parent 36a2606 commit 7462e76
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105 changes: 105 additions & 0 deletions wsutil/ws_getopt.c
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#define _BSD_SOURCE
#include <unistd.h>
#include <wchar.h>
#include <string.h>
#include <limits.h>
#include <stdlib.h>
#include "locale_impl.h"
#include "stdio_impl.h"

char *optarg;
int optind=1, opterr=1, optopt, __optpos, __optreset=0;

#define optpos __optpos
weak_alias(__optreset, optreset);

void __getopt_msg(const char *a, const char *b, const char *c, size_t l)
{
FILE *f = stderr;
b = __lctrans_cur(b);
FLOCK(f);
fputs(a, f)>=0
&& fwrite(b, strlen(b), 1, f)
&& fwrite(c, 1, l, f)==l
&& putc('\n', f);
FUNLOCK(f);
}

int getopt(int argc, char * const argv[], const char *optstring)
{
int i;
wchar_t c, d;
int k, l;
char *optchar;

if (!optind || __optreset) {
__optreset = 0;
__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++;
if ((k = mbtowc(&c, argv[optind]+optpos, MB_LEN_MAX)) < 0) {
k = 1;
c = 0xfffd; /* replacement char */
}
optchar = argv[optind]+optpos;
optpos += k;

if (!argv[optind][optpos]) {
optind++;
optpos = 0;
}

if (optstring[0] == '-' || optstring[0] == '+')
optstring++;

i = 0;
d = 0;
do {
l = mbtowc(&d, optstring+i, MB_LEN_MAX);
if (l>0) i+=l; else i++;
} while (l && d != c);

if (d != c || c == ':') {
optopt = c;
if (optstring[0] != ':' && opterr)
__getopt_msg(argv[0], ": unrecognized option: ", optchar, k);
return '?';
}
if (optstring[i] == ':') {
optarg = 0;
if (optstring[i+1] != ':' || optpos) {
optarg = argv[optind++] + optpos;
optpos = 0;
}
if (optind > argc) {
optopt = c;
if (optstring[0] == ':') return ':';
if (opterr) __getopt_msg(argv[0],
": option requires an argument: ",
optchar, k);
return '?';
}
}
return c;
}

weak_alias(getopt, __posix_getopt);
30 changes: 30 additions & 0 deletions wsutil/ws_getopt.h
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#ifndef _GETOPT_H
#define _GETOPT_H

#ifdef __cplusplus
extern "C" {
#endif

int getopt(int, char * const [], const char *);
extern char *optarg;
extern int optind, opterr, optopt, optreset;

struct option {
const char *name;
int has_arg;
int *flag;
int val;
};

int getopt_long(int, char *const *, const char *, const struct option *, int *);
int getopt_long_only(int, char *const *, const char *, const struct option *, int *);

#define no_argument 0
#define required_argument 1
#define optional_argument 2

#ifdef __cplusplus
}
#endif

#endif
148 changes: 148 additions & 0 deletions wsutil/ws_getopt_long.c
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#define _GNU_SOURCE
#include <stddef.h>
#include <stdlib.h>
#include <limits.h>
#include <getopt.h>
#include <stdio.h>
#include <string.h>
#include "stdio_impl.h"

extern int __optpos, __optreset;

static void permute(char *const *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 *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly);

static int __getopt_long(int argc, char *const *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 *const *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(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
{
return __getopt_long(argc, argv, optstring, longopts, idx, 0);
}

int getopt_long_only(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
{
return __getopt_long(argc, argv, optstring, longopts, idx, 1);
}

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