1 /* $OpenBSD: getoldopt.c,v 1.9 2009/10/27 23:59:22 deraadt Exp $ */
2 /* $NetBSD: getoldopt.c,v 1.3 1995/03/21 09:07:28 cgd Exp $ */
3
4 /*-
5 * Plug-compatible replacement for getopt() for parsing tar-like
6 * arguments. If the first argument begins with "-", it uses getopt;
7 * otherwise, it uses the old rules used by tar, dump, and ps.
8 *
9 * Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu) and placed
10 * in the Public Domain for your edification and enjoyment.
11 */
12
13 #include <sys/cdefs.h>
14 __FBSDID("$FreeBSD$");
15
16 #include <sys/types.h>
17 #include <sys/stat.h>
18 #include <stdio.h>
19 #include <string.h>
20 #include <unistd.h>
21
22 int getoldopt(int, char **, const char *);
23
24 int
getoldopt(int argc,char ** argv,const char * optstring)25 getoldopt(int argc, char **argv, const char *optstring)
26 {
27 static char *key; /* Points to next keyletter */
28 static char use_getopt; /* !=0 if argv[1][0] was '-' */
29 char c;
30 char *place;
31
32 optarg = NULL;
33
34 if (key == NULL) { /* First time */
35 if (argc < 2)
36 return (-1);
37 key = argv[1];
38 if (*key == '-')
39 use_getopt++;
40 else
41 optind = 2;
42 }
43
44 if (use_getopt)
45 return (getopt(argc, argv, optstring));
46
47 c = *key++;
48 if (c == '\0') {
49 key--;
50 return (-1);
51 }
52 place = strchr(optstring, c);
53
54 if (place == NULL || c == ':') {
55 fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
56 return ('?');
57 }
58
59 place++;
60 if (*place == ':') {
61 if (optind < argc) {
62 optarg = argv[optind];
63 optind++;
64 } else {
65 fprintf(stderr, "%s: %c argument missing\n",
66 argv[0], c);
67 return ('?');
68 }
69 }
70
71 return (c);
72 }
73