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. 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 1.3 2003/09/28 14:39:14 hmp Exp $ 14 */ 15 16 #include <stdio.h> 17 #include <string.h> 18 #include <unistd.h> 19 20 int 21 getoldopt(int argc, char **argv, char *optstring) 22 { 23 static char *key; /* Points to next keyletter */ 24 static char use_getopt; /* !=0 if argv[1][0] was '-' */ 25 char c; 26 char *place; 27 28 optarg = NULL; 29 30 if (key == NULL) { /* First time */ 31 if (argc < 2) return EOF; 32 key = argv[1]; 33 if (*key == '-') 34 use_getopt++; 35 else 36 optind = 2; 37 } 38 39 if (use_getopt) 40 return getopt(argc, argv, optstring); 41 42 c = *key++; 43 if (c == '\0') { 44 key--; 45 return EOF; 46 } 47 place = strchr(optstring, c); 48 49 if (place == NULL || c == ':') { 50 fprintf(stderr, "%s: unknown option %c\n", argv[0], c); 51 return('?'); 52 } 53 54 place++; 55 if (*place == ':') { 56 if (optind < argc) { 57 optarg = argv[optind]; 58 optind++; 59 } else { 60 fprintf(stderr, "%s: %c argument missing\n", 61 argv[0], c); 62 return('?'); 63 } 64 } 65 66 return(c); 67 } 68