1 /* $NetBSD: getoldopt.c,v 1.6 1997/09/14 14:54:33 lukem Exp $ */ 2 3 /* 4 * Plug-compatible replacement for getopt() for parsing tar-like 5 * arguments. If the first argument begins with "-", it uses getopt; 6 * otherwise, it uses the old rules used by tar, dump, and ps. 7 * 8 * Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu) and placed 9 * in the Public Domain for your edification and enjoyment. 10 */ 11 12 #include <sys/cdefs.h> 13 #ifndef lint 14 __RCSID("$NetBSD: getoldopt.c,v 1.6 1997/09/14 14:54:33 lukem Exp $"); 15 #endif /* not lint */ 16 17 #include <stdio.h> 18 #include <string.h> 19 #include <unistd.h> 20 #include <sys/stat.h> 21 #include "pax.h" 22 #include "extern.h" 23 24 int 25 getoldopt(argc, argv, optstring) 26 int argc; 27 char **argv; 28 char *optstring; 29 { 30 extern char *optarg; /* Points to next arg */ 31 extern int optind; /* Global argv index */ 32 static char *key; /* Points to next keyletter */ 33 static char use_getopt; /* !=0 if argv[1][0] was '-' */ 34 char c; 35 char *place; 36 37 optarg = NULL; 38 39 if (key == NULL) { /* First time */ 40 if (argc < 2) return -1; 41 key = argv[1]; 42 if (*key == '-') 43 use_getopt++; 44 else 45 optind = 2; 46 } 47 48 if (use_getopt) 49 return getopt(argc, argv, optstring); 50 51 c = *key++; 52 if (c == '\0') { 53 key--; 54 return EOF; 55 } 56 place = strchr(optstring, c); 57 58 if (place == NULL || c == ':') { 59 fprintf(stderr, "%s: unknown option %c\n", argv[0], c); 60 return('?'); 61 } 62 63 place++; 64 if (*place == ':') { 65 if (optind < argc) { 66 optarg = argv[optind]; 67 optind++; 68 } else { 69 fprintf(stderr, "%s: %c argument missing\n", 70 argv[0], c); 71 return('?'); 72 } 73 } 74 75 return(c); 76 } 77