getoldopt.c revision 90110
1156066Sharti/* $OpenBSD: getoldopt.c,v 1.4 2000/01/22 20:24:51 deraadt Exp $ */ 2156066Sharti/* $NetBSD: getoldopt.c,v 1.3 1995/03/21 09:07:28 cgd Exp $ */ 3156066Sharti 4156066Sharti/* 5156066Sharti * Plug-compatible replacement for getopt() for parsing tar-like 6156066Sharti * arguments. If the first argument begins with "-", it uses getopt; 7310903Sngie * otherwise, it uses the old rules used by tar, dump, and ps. 8156066Sharti * 9156066Sharti * Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu) and placed 10156066Sharti * in the Pubic Domain for your edification and enjoyment. 11156066Sharti */ 12156066Sharti 13156066Sharti#ifndef lint 14156066Shartistatic const char rcsid[] = "$FreeBSD: head/bin/pax/getoldopt.c 90110 2002-02-02 06:48:10Z imp $"; 15156066Sharti#endif /* not lint */ 16310903Sngie 17156066Sharti#include <stdio.h> 18156066Sharti#include <string.h> 19156066Sharti#include <unistd.h> 20156066Sharti 21156066Shartiint 22156066Shartigetoldopt(int argc, char **argv, char *optstring) 23156066Sharti{ 24156066Sharti static char *key; /* Points to next keyletter */ 25156066Sharti static char use_getopt; /* !=0 if argv[1][0] was '-' */ 26156066Sharti char c; 27156066Sharti char *place; 28156066Sharti 29156066Sharti optarg = NULL; 30156066Sharti 31156066Sharti if (key == NULL) { /* First time */ 32156066Sharti if (argc < 2) return EOF; 33156066Sharti key = argv[1]; 34156066Sharti if (*key == '-') 35156066Sharti use_getopt++; 36156066Sharti else 37156066Sharti optind = 2; 38156066Sharti } 39156066Sharti 40311725Sngie if (use_getopt) 41156066Sharti return getopt(argc, argv, optstring); 42156066Sharti 43156066Sharti c = *key++; 44156066Sharti if (c == '\0') { 45156066Sharti key--; 46156066Sharti return EOF; 47156066Sharti } 48156066Sharti place = strchr(optstring, c); 49156066Sharti 50156066Sharti if (place == NULL || c == ':') { 51156066Sharti fprintf(stderr, "%s: unknown option %c\n", argv[0], c); 52156066Sharti return('?'); 53156066Sharti } 54156066Sharti 55156066Sharti place++; 56156066Sharti if (*place == ':') { 57156066Sharti if (optind < argc) { 58156066Sharti optarg = argv[optind]; 59156066Sharti optind++; 60156066Sharti } else { 61156066Sharti fprintf(stderr, "%s: %c argument missing\n", 62200063Ssyrinx argv[0], c); 63200063Ssyrinx return('?'); 64200063Ssyrinx } 65200063Ssyrinx } 66200063Ssyrinx 67156066Sharti return(c); 68156066Sharti} 69156066Sharti