Home | History | Annotate | Line # | Download | only in pax
getoldopt.c revision 1.10 
      1 /*	$NetBSD: getoldopt.c,v 1.10 2000/07/04 17:17:49 thorpej 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 #ifndef lint
     14 __RCSID("$NetBSD: getoldopt.c,v 1.10 2000/07/04 17:17:49 thorpej Exp $");
     15 #endif /* not lint */
     16 
     17 #include <stdio.h>
     18 #include <string.h>
     19 #include <unistd.h>
     20 #include <getopt.h>
     21 #include <sys/stat.h>
     22 #include "pax.h"
     23 #include "extern.h"
     24 
     25 int
     26 getoldopt(argc, argv, optstring, longopts, index)
     27 	int	argc;
     28 	char	**argv;
     29 	const char *optstring;
     30 	struct option *longopts;
     31 	int	*index;
     32 {
     33 	static char	*key;		/* Points to next keyletter */
     34 	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
     35 	char		c;
     36 	char		*place;
     37 
     38 	optarg = NULL;
     39 
     40 	if (key == NULL) {		/* First time */
     41 		if (argc < 2) return -1;
     42 		key = argv[1];
     43 		if (*key == '-')
     44 			use_getopt++;
     45 		else
     46 			optind = 2;
     47 	}
     48 
     49 	if (use_getopt)
     50 		return ((longopts != NULL) ?
     51 			getopt_long(argc, argv, optstring, longopts, index) :
     52 			getopt(argc, argv, optstring));
     53 
     54 	c = *key++;
     55 	if (c == '\0') {
     56 		key--;
     57 		return -1;
     58 	}
     59 	place = strchr(optstring, c);
     60 
     61 	if (place == NULL || c == ':') {
     62 		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
     63 		return('?');
     64 	}
     65 
     66 	place++;
     67 	if (*place == ':') {
     68 		if (optind < argc) {
     69 			optarg = argv[optind];
     70 			optind++;
     71 		} else {
     72 			fprintf(stderr, "%s: %c argument missing\n",
     73 				argv[0], c);
     74 			return('?');
     75 		}
     76 	}
     77 
     78 	return(c);
     79 }
     80