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getoldopt.c revision 1.5 
      1 /*	$NetBSD: getoldopt.c,v 1.5 1997/07/20 20:32:34 christos 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 1.5 1997/07/20 20:32:34 christos Exp $");
     15 #endif /* not lint */
     16 
     17 #include <stdio.h>
     18 #include <string.h>
     19 #include <unistd.h>
     20 #include <sys/stat.h>
     21 #include "pax.h"
     22 #include "extern.h"
     23 
     24 int
     25 getoldopt(argc, argv, optstring)
     26 	int	argc;
     27 	char	**argv;
     28 	char	*optstring;
     29 {
     30 	extern char	*optarg;	/* Points to next arg */
     31 	extern int	optind;		/* Global argv index */
     32 	static char	*key;		/* Points to next keyletter */
     33 	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
     34 	char		c;
     35 	char		*place;
     36 
     37 	optarg = NULL;
     38 
     39 	if (key == NULL) {		/* First time */
     40 		if (argc < 2) return EOF;
     41 		key = argv[1];
     42 		if (*key == '-')
     43 			use_getopt++;
     44 		else
     45 			optind = 2;
     46 	}
     47 
     48 	if (use_getopt)
     49 		return getopt(argc, argv, optstring);
     50 
     51 	c = *key++;
     52 	if (c == '\0') {
     53 		key--;
     54 		return EOF;
     55 	}
     56 	place = strchr(optstring, c);
     57 
     58 	if (place == NULL || c == ':') {
     59 		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
     60 		return('?');
     61 	}
     62 
     63 	place++;
     64 	if (*place == ':') {
     65 		if (optind < argc) {
     66 			optarg = argv[optind];
     67 			optind++;
     68 		} else {
     69 			fprintf(stderr, "%s: %c argument missing\n",
     70 				argv[0], c);
     71 			return('?');
     72 		}
     73 	}
     74 
     75 	return(c);
     76 }
     77