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getoldopt.c revision 1.1 
      1 /*
      2  * Plug-compatible replacement for getopt() for parsing tar-like
      3  * arguments.  If the first argument begins with "-", it uses getopt;
      4  * otherwise, it uses the old rules used by tar, dump, and ps.
      5  *
      6  * Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu) and placed
      7  * in the Pubic Domain for your edification and enjoyment.
      8  */
      9 
     10 #ifndef lint
     11 static char *rcsid = "$Id: getoldopt.c,v 1.1 1994/06/14 01:16:07 jtc Exp $";
     12 #endif /* not lint */
     13 
     14 #include <stdio.h>
     15 #include <string.h>
     16 
     17 int
     18 getoldopt(argc, argv, optstring)
     19 	int	argc;
     20 	char	**argv;
     21 	char	*optstring;
     22 {
     23 	extern char	*optarg;	/* Points to next arg */
     24 	extern int	optind;		/* Global argv index */
     25 	static char	*key;		/* Points to next keyletter */
     26 	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
     27 	char		c;
     28 	char		*place;
     29 
     30 	optarg = NULL;
     31 
     32 	if (key == NULL) {		/* First time */
     33 		if (argc < 2) return EOF;
     34 		key = argv[1];
     35 		if (*key == '-')
     36 			use_getopt++;
     37 		else
     38 			optind = 2;
     39 	}
     40 
     41 	if (use_getopt)
     42 		return getopt(argc, argv, optstring);
     43 
     44 	c = *key++;
     45 	if (c == '\0') {
     46 		key--;
     47 		return EOF;
     48 	}
     49 	place = strchr(optstring, c);
     50 
     51 	if (place == NULL || c == ':') {
     52 		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
     53 		return('?');
     54 	}
     55 
     56 	place++;
     57 	if (*place == ':') {
     58 		if (optind < argc) {
     59 			optarg = argv[optind];
     60 			optind++;
     61 		} else {
     62 			fprintf(stderr, "%s: %c argument missing\n",
     63 				argv[0], c);
     64 			return('?');
     65 		}
     66 	}
     67 
     68 	return(c);
     69 }
     70