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 13 #ifndef lint 14 static char rcsid[] = "$OpenBSD: getoldopt.c,v 1.4 2000/01/22 20:24:51 deraadt Exp $"; 15 #endif /* not lint */ 16 17 #include <stdio.h> 18 #include <string.h> 19 #include <unistd.h> 20 21 int 22 getoldopt(argc, argv, optstring) 23 int argc; 24 char **argv; 25 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) return EOF; 36 key = argv[1]; 37 if (*key == '-') 38 use_getopt++; 39 else 40 optind = 2; 41 } 42 43 if (use_getopt) 44 return getopt(argc, argv, optstring); 45 46 c = *key++; 47 if (c == '\0') { 48 key--; 49 return EOF; 50 } 51 place = strchr(optstring, c); 52 53 if (place == NULL || c == ':') { 54 fprintf(stderr, "%s: unknown option %c\n", argv[0], c); 55 return('?'); 56 } 57 58 place++; 59 if (*place == ':') { 60 if (optind < argc) { 61 optarg = argv[optind]; 62 optind++; 63 } else { 64 fprintf(stderr, "%s: %c argument missing\n", 65 argv[0], c); 66 return('?'); 67 } 68 } 69 70 return(c); 71 } 72