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/* subgetopt.c, subgetopt.h: (yet another) improved getopt clone, inner layer
D. J. Bernstein, djb@pobox.com.
No dependencies.
No system requirements.
19970228: Cleanups.
931129: Adapted from getopt.c.
No known patent problems.
Documentation in subgetopt.3.
*/
#define SUBGETOPTNOSHORT
#include "subgetopt.h"
#define sgopt subgetopt
#define optind subgetoptind
#define optpos subgetoptpos
#define optarg subgetoptarg
#define optproblem subgetoptproblem
#define optdone subgetoptdone
int optind = 1;
int optpos = 0;
char *optarg = 0;
int optproblem = 0;
int optdone = SUBGETOPTDONE;
int sgopt(argc,argv,opts)
int argc;
char **argv;
char *opts;
{
int c;
char *s;
optarg = 0;
if (!argv || (optind >= argc) || !argv[optind]) return optdone;
if (optpos && !argv[optind][optpos]) {
++optind;
optpos = 0;
if ((optind >= argc) || !argv[optind]) return optdone;
}
if (!optpos) {
if (argv[optind][0] != '-') return optdone;
++optpos;
c = argv[optind][1];
if ((c == '-') || (c == 0)) {
if (c) ++optind;
optpos = 0;
return optdone;
}
/* otherwise c is reassigned below */
}
c = argv[optind][optpos];
++optpos;
s = opts;
while (*s) {
if (c == *s) {
if (s[1] == ':') {
optarg = argv[optind] + optpos;
++optind;
optpos = 0;
if (!*optarg) {
optarg = argv[optind];
if ((optind >= argc) || !optarg) { /* argument past end */
optproblem = c;
return '?';
}
++optind;
}
}
return c;
}
++s;
if (*s == ':') ++s;
}
optproblem = c;
return '?';
}
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