1 /* 2 * Plug-compatible replacement for getopt() for parsing tar-like 3 * arguments. If the first argument begins with "-", it uses getopt; 4 * otherwise, it uses the old rules used by tar, dump, and ps. 5 * 6 * Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu) and placed 7 * in the Pubic Domain for your edification and enjoyment. 8 */ 9 10 #ifndef lint 11 static char *rcsid = "$Id: getoldopt.c,v 1.2 1994/12/04 07:11:53 cgd Exp $"; 12 #endif /* not lint */ 13 14 #include <stdio.h> 15 #include <string.h> 16 #include <unistd.h> 17 18 int 19 getoldopt(argc, argv, optstring) 20 int argc; 21 char **argv; 22 char *optstring; 23 { 24 extern char *optarg; /* Points to next arg */ 25 extern int optind; /* Global argv index */ 26 static char *key; /* Points to next keyletter */ 27 static char use_getopt; /* !=0 if argv[1][0] was '-' */ 28 char c; 29 char *place; 30 31 optarg = NULL; 32 33 if (key == NULL) { /* First time */ 34 if (argc < 2) return EOF; 35 key = argv[1]; 36 if (*key == '-') 37 use_getopt++; 38 else 39 optind = 2; 40 } 41 42 if (use_getopt) 43 return getopt(argc, argv, optstring); 44 45 c = *key++; 46 if (c == '\0') { 47 key--; 48 return EOF; 49 } 50 place = strchr(optstring, c); 51 52 if (place == NULL || c == ':') { 53 fprintf(stderr, "%s: unknown option %c\n", argv[0], c); 54 return('?'); 55 } 56 57 place++; 58 if (*place == ':') { 59 if (optind < argc) { 60 optarg = argv[optind]; 61 optind++; 62 } else { 63 fprintf(stderr, "%s: %c argument missing\n", 64 argv[0], c); 65 return('?'); 66 } 67 } 68 69 return(c); 70 } 71