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 #include <sys/types.h>
15 #include <sys/stat.h>
16 #include <stdio.h>
17 #include <string.h>
18 #include <unistd.h>
19
20 int getoldopt(int, char **, const char *);
21
22 int
getoldopt(int argc,char ** argv,const char * optstring)23 getoldopt(int argc, char **argv, const char *optstring)
24 {
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)
34 return (-1);
35 key = argv[1];
36 if (*key == '-')
37 use_getopt++;
38 else
39 optind = 2;
40 }
41
42 if (use_getopt)
43 return (getopt(argc, argv, optstring));
44
45 c = *key++;
46 if (c == '\0') {
47 key--;
48 return (-1);
49 }
50 place = strchr(optstring, c);
51
52 if (place == NULL || c == ':') {
53 fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
54 return ('?');
55 }
56
57 place++;
58 if (*place == ':') {
59 if (optind < argc) {
60 optarg = argv[optind];
61 optind++;
62 } else {
63 fprintf(stderr, "%s: %c argument missing\n",
64 argv[0], c);
65 return ('?');
66 }
67 }
68
69 return (c);
70 }
71