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#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
int sh_getopt(int argc, char * const argv[], const char *optstring)
{
static int optchar = 0;
char *option = NULL;
if (optind == 0) {
optind = 1;
optchar = 0;
}
if (argv[optind] == NULL) {
return -1;
}
if (argv[optind][0] != '-') {
return -1;
}
if (!strcmp(argv[optind], "-")) {
return -1;
}
if (!strcmp(argv[optind], "--")) {
optind++;
optchar = 0;
return -1;
}
if (optchar == 0 && argv[optind][optchar] != '-') {
return -1;
}
optchar++;
if (argv[optind][optchar] == '\0') {
optind++;
optchar = 0;
return getopt(argc, argv, optstring);
}
option = strchr(optstring, argv[optind][optchar]);
if (!option) {
optopt = argv[optind][optchar];
if (opterr != 0 && optstring[0] != ':') {
fprintf(stderr, "%s: invalid option -%c\n", argv[0],
optopt);
}
return '?';
}
if (option[1] != ':') {
return *option;
}
if (argv[optind][optchar + 1] == '\0') {
optarg = argv[++optind];
} else {
optarg = argv[optind] + optchar + 1;
}
optind++;
if (optarg == NULL) {
optopt = *option;
if (opterr != 0 && optstring[0] != ':') {
fprintf(stderr, "%s: missing argument to option -%c\n",
argv[0], optopt);
}
return optstring[0] == ':' ? ':' : '?';
}
optchar = 0;
return *option;
}
/*
POSIX(2)
*/
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