Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most
[dragonfly.git] / bin / pax / getoldopt.c
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1/* $OpenBSD: getoldopt.c,v 1.4 2000/01/22 20:24:51 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 Pubic Domain for your edification and enjoyment.
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11 *
12 * $FreeBSD: src/bin/pax/getoldopt.c,v 1.1.2.1 2001/08/01 05:03:11 obrien Exp $
13 * $DragonFly: src/bin/pax/getoldopt.c,v 1.2 2003/06/17 04:22:50 dillon Exp $
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14 */
15
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16#include <stdio.h>
17#include <string.h>
18#include <unistd.h>
19
20int
21getoldopt(argc, argv, optstring)
22 int argc;
23 char **argv;
24 char *optstring;
25{
26 static char *key; /* Points to next keyletter */
27 static char use_getopt; /* !=0 if argv[1][0] was '-' */
28 char c;
29 char *place;
30
31 optarg = NULL;
32
33 if (key == NULL) { /* First time */
34 if (argc < 2) return EOF;
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 EOF;
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}