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/types.h> 14 #include <sys/stat.h> 15 #include <stdio.h> 16 #include <string.h> 17 #include <unistd.h> 18 19 int getoldopt(int, char **, const char *); 20 21 int 22 getoldopt(int argc, char **argv, const char *optstring) 23 { 24 static char *key; /* Points to next keyletter */ 25 static char use_getopt; /* !=0 if argv[1][0] was '-' */ 26 char c; 27 char *place; 28 29 optarg = NULL; 30 31 if (key == NULL) { /* First time */ 32 if (argc < 2) 33 return (-1); 34 key = argv[1]; 35 if (*key == '-') 36 use_getopt++; 37 else 38 optind = 2; 39 } 40 41 if (use_getopt) 42 return (getopt(argc, argv, optstring)); 43 44 c = *key++; 45 if (c == '\0') { 46 key--; 47 return (-1); 48 } 49 place = strchr(optstring, c); 50 51 if (place == NULL || c == ':') { 52 fprintf(stderr, "%s: unknown option %c\n", argv[0], c); 53 return ('?'); 54 } 55 56 place++; 57 if (*place == ':') { 58 if (optind < argc) { 59 optarg = argv[optind]; 60 optind++; 61 } else { 62 fprintf(stderr, "%s: %c argument missing\n", 63 argv[0], c); 64 return ('?'); 65 } 66 } 67 68 return (c); 69 } 70