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/*
* Revision Control Information
*
* /projects/hsis/CVS/utilities/util/getopt.c,v
* rajeev
* 1.3
* 1995/08/08 22:41:22
*
*/
/* LINTLIBRARY */
#include <stdio.h>
#include "util.h"
/* File : getopt.c
* Author : Henry Spencer, University of Toronto
* Updated: 28 April 1984
*
* Changes: (R Rudell)
* changed index() to strchr();
* added getopt_reset() to reset the getopt argument parsing
*
* Purpose: get option letter from argv.
*/
char *util_optarg; /* Global argument pointer. */
int util_optind = 0; /* Global argv index. */
static char *scan;
void
util_getopt_reset()
{
util_optarg = 0;
util_optind = 0;
scan = 0;
}
int
util_getopt(argc, argv, optstring)
int argc;
char *argv[];
char *optstring;
{
register int c;
register char *place;
util_optarg = NIL(char);
if (scan == NIL(char) || *scan == '\0') {
if (util_optind == 0) util_optind++;
if (util_optind >= argc) return EOF;
place = argv[util_optind];
if (place[0] != '-' || place[1] == '\0') return EOF;
util_optind++;
if (place[1] == '-' && place[2] == '\0') return EOF;
scan = place+1;
}
c = *scan++;
place = strchr(optstring, c);
if (place == NIL(char) || c == ':') {
(void) fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
return '?';
}
if (*++place == ':') {
if (*scan != '\0') {
util_optarg = scan;
scan = NIL(char);
} else {
if (util_optind >= argc) {
(void) fprintf(stderr, "%s: %c requires an argument\n",
argv[0], c);
return '?';
}
util_optarg = argv[util_optind];
util_optind++;
}
}
return c;
}
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