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/* $OpenBSD: getoldopt.c,v 1.7 2002/10/16 19:20:02 millert Exp $ */
/* $NetBSD: getoldopt.c,v 1.3 1995/03/21 09:07:28 cgd Exp $ */
/*
* Plug-compatible replacement for getopt() for parsing tar-like
* arguments. If the first argument begins with "-", it uses getopt;
* otherwise, it uses the old rules used by tar, dump, and ps.
*
* Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu) and placed
* in the Public Domain for your edification and enjoyment.
*/
#ifndef lint
static const char rcsid[] = "$OpenBSD: getoldopt.c,v 1.7 2002/10/16 19:20:02 millert Exp $";
#endif /* not lint */
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int
getoldopt(int argc, char **argv, const char *optstring)
{
static char *key; /* Points to next keyletter */
static char use_getopt; /* !=0 if argv[1][0] was '-' */
char c;
char *place;
optarg = NULL;
if (key == NULL) { /* First time */
if (argc < 2)
return (-1);
key = argv[1];
if (*key == '-')
use_getopt++;
else
optind = 2;
}
if (use_getopt)
return (getopt(argc, argv, optstring));
c = *key++;
if (c == '\0') {
key--;
return (-1);
}
place = strchr(optstring, c);
if (place == NULL || c == ':') {
fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
return ('?');
}
place++;
if (*place == ':') {
if (optind < argc) {
optarg = argv[optind];
optind++;
} else {
fprintf(stderr, "%s: %c argument missing\n",
argv[0], c);
return ('?');
}
}
return (c);
}
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