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Copy pathgetopt.c
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216 lines (197 loc) · 4.78 KB
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#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include "getopt.h"
char *optarg;
int optind=1, opterr=1, optopt, __optpos, optreset=0;
#define optpos __optpos
static void __getopt_msg(const char *a, const char *b, const char *c, size_t l)
{
FILE *f = stderr;
#if !defined(WIN32) && !defined(_WIN32)
flockfile(f);
#endif
fputs(a, f);
fwrite(b, strlen(b), 1, f);
fwrite(c, 1, l, f);
fputc('\n', f);
#if !defined(WIN32) && !defined(_WIN32)
funlockfile(f);
#endif
}
int getopt(int argc, char * const argv[], const char *optstring)
{
int i, 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++;
c = argv[optind][optpos], k = 1;
optchar = argv[optind]+optpos;
optopt = c;
optpos += k;
if (!argv[optind][optpos]) {
optind++;
optpos = 0;
}
if (optstring[0] == '-' || optstring[0] == '+')
optstring++;
i = 0;
d = 0;
do {
d = optstring[i], l = 1;
if (l>0) i+=l; else i++;
} while (l && d != c);
if (d != c) {
if (optstring[0] != ':' && opterr)
__getopt_msg(argv[0], ": unrecognized option: ", optchar, k);
return '?';
}
if (optstring[i] == ':') {
if (optstring[i+1] == ':') optarg = 0;
else if (optind >= argc) {
if (optstring[0] == ':') return ':';
if (opterr) __getopt_msg(argv[0],
": option requires an argument: ",
optchar, k);
return '?';
}
if (optstring[i+1] != ':' || optpos) {
optarg = argv[optind++] + optpos;
optpos = 0;
}
}
return c;
}
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)
{
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 = -1;
char *opt;
for (cnt=i=0; longopts[i].name; i++) {
const char *name = longopts[i].name;
opt = argv[optind]+1;
if (*opt == '-') opt++;
for (; *name && *name == *opt; name++, opt++);
if (*opt && *opt != '=') continue;
match = i;
if (!*name) {
cnt = 1;
break;
}
cnt++;
}
if (cnt==1) {
i = match;
optind++;
optopt = longopts[i].val;
if (*opt == '=') {
if (!longopts[i].has_arg) {
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])) {
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] == '-') {
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);
}
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;
}
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);
}