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/*
* my_getopt is supposed to emulate the C Library getopt (which, according
* to the man pages, is written by Henry Spencer to emulate the Bell Lab
* version).
*
* my_getopt is scanning argv[optind] (and, perhaps, following arguments),
* looking for the first option starting with `-' and a character from
* optstring[]. Therefore, if you are looking for options in argv[1] etc.,
* you should initialize optind with 1 (not 0, as the manual erroneously
* claims).
*
* Experiments with getopt() established that when an argument consists of more
* than one option, getopt() stores the pointer to the beginning of the
* argument as a static variable, for re-use later.
*
* See the getopt manual pages for more information on getopt.
*
* Written by V.Menkov, IU, 1995
*/
#include <stdlib.h>
#include <string.h>
#include "main.h"
#include "mygetopt.h"
char *optarg = 0;
int optind = 1;
int my_getopt(int argc, char **argv, char *optstring)
{
char *q;
static char *rem = NULL;
int c;
int needarg = 0;
optarg = NULL;
diagnostics(4, "Processing option `%s'", argv[optind]);
/*
* printf("optind = %d\n", optind); if (rem) printf("rem=`%s'\n",
* rem);
*/
if (!rem) {
if (optind < argc && argv[optind][0] == '-') {
rem = argv[optind] + 1;
if (*rem == 0)
return EOF; /* Treat lone "-" as a non-option arg */
if (*rem == '-') {
optind++;
return EOF;
} /* skip "--" and terminate */
} else
return EOF;
}
c = *rem;
q = strchr(optstring, c);
if (q && c != ':') { /* matched */
needarg = (q[1] == ':');
if (needarg) {
if (rem[1] != 0)
optarg = rem + 1;
else {
optind++;
if (optind < argc)
optarg = argv[optind];
else {
diagnostics(ERROR, "Missing argument after -%c\n", c);
}
}
} else
rem++;
} else {
diagnostics(WARNING, "%s: illegal option -- %c\n", argv[0], c);
c = '?';
rem++;
}
if (needarg || *rem == 0) {
rem = NULL;
optind++;
}
return c;
}
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