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#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/uio.h>
char *optarg;
int optind = 1, opterr = 1, optopt;
int getopt(int argc, char *const argv[], const char *optstring)
{
char *optchar;
char c, d;
int i;
static int optpos;
if (optind == 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] == 0) {
return -1;
}
if (argv[optind][1] == '-' && argv[optind][2] == 0) {
return optind++, -1;
}
if (optpos == 0)
optpos++;
c = argv[optind][optpos];
optchar = argv[optind] + optpos++;
if (argv[optind][optpos] == 0) {
optind++;
optpos = 0;
}
i = 0;
do {
d = optstring[i++];
} while (d && d != c);
if (d != c || c == ':') {
optopt = c;
if (optstring[0] != ':' && opterr) {
struct iovec iov[4];
char opt_char[2] = { *optchar, '\0' };
iov[0].iov_base = argv[0];
iov[0].iov_len = strlen(argv[0]);
iov[1].iov_base = ": invalid option -- ";
iov[1].iov_len = 20;
iov[2].iov_base = opt_char;
iov[2].iov_len = 1;
iov[3].iov_base = "\n";
iov[3].iov_len = 1;
writev(STDERR_FILENO, iov, 4);
}
return '?';
}
if (optstring[i] == ':') {
optarg = 0;
if (optstring[i + 1] != ':' || optpos) {
optarg = argv[optind++];
if (optpos) {
optarg += optpos;
}
optpos = 0;
}
if (optind > argc) {
optopt = c;
if (optstring[0] == ':') {
return ':';
}
if (opterr) {
struct iovec iov[4];
char opt_char[2] = { *optchar, '\0' };
iov[0].iov_base = argv[0];
iov[0].iov_len = strlen(argv[0]);
iov[1].iov_base =
": option requires an argument -- ";
iov[1].iov_len = 33;
iov[2].iov_base = opt_char;
iov[2].iov_len = 1;
iov[3].iov_base = "\n";
iov[3].iov_len = 1;
writev(STDERR_FILENO, iov, 4);
}
return '?';
}
}
return c;
}
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