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getoldopt.c revision 1.21 
      1 /*	$NetBSD: getoldopt.c,v 1.21 2005/06/05 19:08:28 chs 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 1.21 2005/06/05 19:08:28 chs 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 	c = '\0';
     55 	if (!use_getopt) {
     56 		c = *key++;
     57 		if (c == '\0') {
     58 			key--;
     59 			use_getopt = 1;
     60 		}
     61 	}
     62 	if (use_getopt) {
     63 		if (longopts != NULL) {
     64 			return getopt_long(argc, argv, optstring,
     65 			    longopts, idx);
     66 		} else {
     67 			return getopt(argc, argv, optstring);
     68 		}
     69 	}
     70 
     71 	place = strchr(optstring, c);
     72 
     73 	if (place == NULL || c == ':') {
     74 		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
     75 		return('?');
     76 	}
     77 
     78 	place++;
     79 	if (*place == ':') {
     80 		if (optind < argc) {
     81 			optarg = argv[optind];
     82 			optind++;
     83 		} else {
     84 			fprintf(stderr, "%s: %c argument missing\n",
     85 				argv[0], c);
     86 			return('?');
     87 		}
     88 	}
     89 
     90 	return(c);
     91 }
     92