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getoldopt.c revision 1.20 
      1 /*	$NetBSD: getoldopt.c,v 1.20 2004/06/20 22:20:14 jmc 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 #if HAVE_NBTOOL_CONFIG_H
     13 #include "nbtool_config.h"
     14 #endif
     15 
     16 #include <sys/cdefs.h>
     17 #if !defined(lint)
     18 __RCSID("$NetBSD: getoldopt.c,v 1.20 2004/06/20 22:20:14 jmc Exp $");
     19 #endif /* not lint */
     20 
     21 #if HAVE_NBTOOL_CONFIG_H
     22 #include "compat_getopt.h"
     23 #else
     24 #include <getopt.h>
     25 #endif
     26 #include <stdio.h>
     27 #include <string.h>
     28 #include <stdlib.h>
     29 #include <unistd.h>
     30 #include <sys/stat.h>
     31 #include "pax.h"
     32 #include "extern.h"
     33 
     34 int
     35 getoldopt(int argc, char **argv, const char *optstring,
     36 	struct option *longopts, int *idx)
     37 {
     38 	static char	*key;		/* Points to next keyletter */
     39 	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
     40 	char		c;
     41 	char		*place;
     42 
     43 	optarg = NULL;
     44 
     45 	if (key == NULL) {		/* First time */
     46 		if (argc < 2) return -1;
     47 		key = argv[1];
     48 		if (*key == '-')
     49 			use_getopt++;
     50 		else
     51 			optind = 2;
     52 	}
     53 
     54 	if (!use_getopt) {
     55 		c = *key++;
     56 		if (c == '\0') {
     57 			key--;
     58 			use_getopt = 1;
     59 		}
     60 	}
     61 	if (use_getopt) {
     62 		if (longopts != NULL) {
     63 			return getopt_long(argc, argv, optstring,
     64 			    longopts, idx);
     65 		} else {
     66 			return getopt(argc, argv, optstring);
     67 		}
     68 	}
     69 
     70 	place = strchr(optstring, c);
     71 
     72 	if (place == NULL || c == ':') {
     73 		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
     74 		return('?');
     75 	}
     76 
     77 	place++;
     78 	if (*place == ':') {
     79 		if (optind < argc) {
     80 			optarg = argv[optind];
     81 			optind++;
     82 		} else {
     83 			fprintf(stderr, "%s: %c argument missing\n",
     84 				argv[0], c);
     85 			return('?');
     86 		}
     87 	}
     88 
     89 	return(c);
     90 }
     91