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 #include "pax.h" 23 #include "extern.h" 24 25 int 26 getoldopt(int argc, char **argv, const char *optstring) 27 { 28 static char *key; /* Points to next keyletter */ 29 static char use_getopt; /* !=0 if argv[1][0] was '-' */ 30 char c; 31 char *place; 32 33 optarg = NULL; 34 35 if (key == NULL) { /* First time */ 36 if (argc < 2) 37 return (-1); 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 (-1); 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