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getoldopt.c revision 1.14 
      1 /*	$NetBSD: getoldopt.c,v 1.14 2002/01/31 22:43:35 tv Exp $	*/
      2 
      3 /*
      4  * Plug-compatible replacement for getopt() for parsing tar-like
      5  * arguments.  If the first argument begins with "-", it uses getopt;
      6  * otherwise, it uses the old rules used by tar, dump, and ps.
      7  *
      8  * Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu) and placed
      9  * in the Public Domain for your edification and enjoyment.
     10  */
     11 
     12 #include <sys/cdefs.h>
     13 #if defined(__RCSID) && !defined(lint)
     14 __RCSID("$NetBSD: getoldopt.c,v 1.14 2002/01/31 22:43:35 tv Exp $");
     15 #endif /* not lint */
     16 
     17 #include <getopt.h>
     18 #include <stdio.h>
     19 #include <string.h>
     20 #include <unistd.h>
     21 #include <sys/stat.h>
     22 #include "pax.h"
     23 #include "extern.h"
     24 
     25 int
     26 getoldopt(int argc, char **argv, const char *optstring,
     27 	struct option *longopts, int *idx)
     28 {
     29 	static char	*key;		/* Points to next keyletter */
     30 	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
     31 	char		c;
     32 	char		*place;
     33 
     34 	optarg = NULL;
     35 
     36 	if (key == NULL) {		/* First time */
     37 		if (argc < 2) return -1;
     38 		key = argv[1];
     39 		if (*key == '-')
     40 			use_getopt++;
     41 		else
     42 			optind = 2;
     43 	}
     44 
     45 	if (use_getopt)
     46 		return ((longopts != NULL) ?
     47 			getopt_long(argc, argv, optstring, longopts, idx) :
     48 			getopt(argc, argv, optstring));
     49 
     50 	c = *key++;
     51 	if (c == '\0') {
     52 		key--;
     53 		return -1;
     54 	}
     55 	place = strchr(optstring, c);
     56 
     57 	if (place == NULL || c == ':') {
     58 		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
     59 		return('?');
     60 	}
     61 
     62 	place++;
     63 	if (*place == ':') {
     64 		if (optind < argc) {
     65 			optarg = argv[optind];
     66 			optind++;
     67 		} else {
     68 			fprintf(stderr, "%s: %c argument missing\n",
     69 				argv[0], c);
     70 			return('?');
     71 		}
     72 	}
     73 
     74 	return(c);
     75 }
     76