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#include <unistd.h>
#include <wchar.h>
#include <string.h>
#include <limits.h>
#include <stdlib.h>
char *optarg;
int optind=1, opterr=1, optopt;
static int optpos;
int getopt(int argc, char * const argv[], const char *optstring)
{
int i;
wchar_t c, d;
int k, l;
char *optchar;
if (optind >= argc || !argv[optind] || argv[optind][0] != '-' || !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;
optopt = c;
optpos += k;
if (!argv[optind][optpos]) {
optind++;
optpos = 0;
}
for (i=0; (l = mbtowc(&d, optstring+i, MB_LEN_MAX)) && d!=c; i+=l>0?l:1);
if (d != c) {
if (optstring[0] != ':' && opterr) {
write(2, argv[0], strlen(argv[0]));
write(2, ": illegal option: ", 18);
write(2, optchar, k);
write(2, "\n", 1);
}
return '?';
}
if (optstring[i+1] == ':') {
if (optind >= argc) {
if (optstring[0] == ':') return ':';
if (opterr) {
write(2, argv[0], strlen(argv[0]));
write(2, ": option requires an argument: ", 31);
write(2, optchar, k);
write(2, "\n", 1);
}
return '?';
}
optarg = argv[optind++] + optpos;
optpos = 0;
}
return c;
}
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