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/* fetchopt.cc
*
* Options parsing class
* May 2011
* by Timothy Baldock <tb@entropy.me.uk>
*/
#include <string.h>
#include "fetchopt.h"
Fetchopt_t::Fetchopt_t(int argc, char **argv, const char *optstring) {
optarg = NULL;
optind = 1;
optstr = optstring;
ac = argc;
av = argv;
pos = 1;
}
char *Fetchopt_t::get_optarg() {
return optarg;
}
int Fetchopt_t::get_optind() {
return optind;
}
int Fetchopt_t::next() {
optarg = NULL;
if (optind >= ac || av[optind][0] != '-') {
return -1;
}
int optchar = av[optind][pos];
const char *offset = strchr(optstr, optchar);
if (offset == NULL || optchar == ':') {
// Invalid option
return '?';
}
if (*(offset+1) == ':') {
// Option with argument
if (av[optind][pos+1] == '\0') {
// Use next argument for option's argument
if (ac < optind+2) {
// Missing argument
return '?';
} else {
optarg = av[optind+1];
optind += 2;
}
} else {
// Use rest of current argument for option's argument
optarg = av[optind]+pos+1;
optind++;
}
pos = 1;
return optchar;
} else {
// Simple option
pos++;
if (av[optind][pos] == '\0') {
// Next argument
pos = 1;
optind++;
}
return optchar;
}
}
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