68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/* $OpenBSD: getoldopt.c,v 1.4 2000/01/22 20:24:51 deraadt Exp $ */
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/* $NetBSD: getoldopt.c,v 1.3 1995/03/21 09:07:28 cgd Exp $ */
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/*
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* Plug-compatible replacement for getopt() for parsing tar-like
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* arguments. If the first argument begins with "-", it uses getopt;
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* otherwise, it uses the old rules used by tar, dump, and ps.
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*
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* Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu) and placed
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* in the Pubic Domain for your edification and enjoyment.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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int
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getoldopt(int argc, char **argv, char *optstring)
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{
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static char *key; /* Points to next keyletter */
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static char use_getopt; /* !=0 if argv[1][0] was '-' */
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char c;
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char *place;
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optarg = NULL;
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if (key == NULL) { /* First time */
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if (argc < 2) return EOF;
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key = argv[1];
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if (*key == '-')
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use_getopt++;
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else
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optind = 2;
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}
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if (use_getopt)
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return getopt(argc, argv, optstring);
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c = *key++;
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if (c == '\0') {
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key--;
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return EOF;
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}
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place = strchr(optstring, c);
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if (place == NULL || c == ':') {
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fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
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return('?');
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}
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place++;
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if (*place == ':') {
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if (optind < argc) {
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optarg = argv[optind];
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optind++;
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} else {
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fprintf(stderr, "%s: %c argument missing\n",
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argv[0], c);
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return('?');
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}
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}
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return(c);
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}
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