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      1 /*	$NetBSD: getoldopt.c,v 1.24 2024/10/03 20:14:01 rillig 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 1.24 2024/10/03 20:14:01 rillig 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 <stdint.h>
     31 #include <sys/stat.h>
     32 #include "pax.h"
     33 #include "extern.h"
     34 
     35 int
     36 getoldopt(int argc, char **argv, const char *optstring,
     37 	struct option *longopts, int *idx)
     38 {
     39 	static char	*key;		/* Points to next keyletter */
     40 	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
     41 	char		c;
     42 	const char	*place;
     43 
     44 	optarg = NULL;
     45 
     46 	if (key == NULL) {		/* First time */
     47 		if (argc < 2) return -1;
     48 		key = argv[1];
     49 		if (*key == '-')
     50 			use_getopt++;
     51 		else
     52 			optind = 2;
     53 	}
     54 
     55 	c = '\0';
     56 	if (!use_getopt) {
     57 		c = *key++;
     58 		if (c == '\0') {
     59 			key--;
     60 			use_getopt = 1;
     61 		}
     62 	}
     63 	if (use_getopt) {
     64 		if (longopts != NULL) {
     65 			return getopt_long(argc, argv, optstring,
     66 			    longopts, idx);
     67 		} else {
     68 			return getopt(argc, argv, optstring);
     69 		}
     70 	}
     71 
     72 	place = strchr(optstring, c);
     73 
     74 	if (place == NULL || c == ':') {
     75 		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
     76 		return '?';
     77 	}
     78 
     79 	place++;
     80 	if (*place == ':') {
     81 		if (optind < argc) {
     82 			optarg = argv[optind];
     83 			optind++;
     84 		} else {
     85 			fprintf(stderr, "%s: %c argument missing\n",
     86 				argv[0], c);
     87 			return '?';
     88 		}
     89 	}
     90 
     91 	return c;
     92 }
     93