1 /* $OpenBSD: getoldopt.c,v 1.2 1996/06/23 14:20:36 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 1.2 1996/06/23 14:20:36 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 extern char *optarg; /* Points to next arg */ 28 extern int optind; /* Global argv index */ 29 static char *key; /* Points to next keyletter */ 30 static char use_getopt; /* !=0 if argv[1][0] was '-' */ 31 char c; 32 char *place; 33 34 optarg = NULL; 35 36 if (key == NULL) { /* First time */ 37 if (argc < 2) return EOF; 38 key = argv[1]; 39 if (*key == '-') 40 use_getopt++; 41 else 42 optind = 2; 43 } 44 45 if (use_getopt) 46 return getopt(argc, argv, optstring); 47 48 c = *key++; 49 if (c == '\0') { 50 key--; 51 return EOF; 52 } 53 place = strchr(optstring, c); 54 55 if (place == NULL || c == ':') { 56 fprintf(stderr, "%s: unknown option %c\n", argv[0], c); 57 return('?'); 58 } 59 60 place++; 61 if (*place == ':') { 62 if (optind < argc) { 63 optarg = argv[optind]; 64 optind++; 65 } else { 66 fprintf(stderr, "%s: %c argument missing\n", 67 argv[0], c); 68 return('?'); 69 } 70 } 71 72 return(c); 73 } 74