1 /* $OpenBSD: getoldopt.c,v 1.9 2009/10/27 23:59:22 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 Public Domain for your edification and enjoyment. 11 */ 12 13 #include <sys/cdefs.h> 14 __FBSDID("$FreeBSD$"); 15 16 #include <sys/types.h> 17 #include <sys/stat.h> 18 #include <stdio.h> 19 #include <string.h> 20 #include <unistd.h> 21 22 int getoldopt(int, char **, const char *); 23 24 int 25 getoldopt(int argc, char **argv, const 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) 36 return (-1); 37 key = argv[1]; 38 if (*key == '-') 39 use_getopt++; 40 else 41 optind = 2; 42 } 43 44 if (use_getopt) 45 return (getopt(argc, argv, optstring)); 46 47 c = *key++; 48 if (c == '\0') { 49 key--; 50 return (-1); 51 } 52 place = strchr(optstring, c); 53 54 if (place == NULL || c == ':') { 55 fprintf(stderr, "%s: unknown option %c\n", argv[0], c); 56 return ('?'); 57 } 58 59 place++; 60 if (*place == ':') { 61 if (optind < argc) { 62 optarg = argv[optind]; 63 optind++; 64 } else { 65 fprintf(stderr, "%s: %c argument missing\n", 66 argv[0], c); 67 return ('?'); 68 } 69 } 70 71 return (c); 72 } 73