1/*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#if 0 31#ifndef lint 32static char const copyright[] = 33"@(#) Copyright (c) 1991, 1993, 1994\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35#endif /* not lint */ 36 37#ifndef lint 38static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94"; 39#endif /* not lint */ 40#endif 41#include <sys/cdefs.h> 42__FBSDID("$FreeBSD: src/bin/pwd/pwd.c,v 1.25 2005/02/09 17:37:38 ru Exp $"); 43 44#include <sys/param.h> 45#include <sys/stat.h> 46#include <sys/types.h> 47 48#include <err.h> 49#include <errno.h> 50#include <stdio.h> 51#include <stdlib.h> 52#include <unistd.h> 53 54static char *getcwd_logical(void); 55void usage(void); 56 57int 58main(int argc, char *argv[]) 59{ 60 int physical; 61 int ch; 62 char *p; 63 64 // 4207130 65 physical = 0; 66 while ((ch = getopt(argc, argv, "LP")) != -1) 67 switch (ch) { 68 case 'L': 69 physical = 0; 70 break; 71 case 'P': 72 physical = 1; 73 break; 74 case '?': 75 default: 76 usage(); 77 } 78 argc -= optind; 79 argv += optind; 80 81 if (argc != 0) 82 usage(); 83 84 /* 85 * If we're trying to find the logical current directory and that 86 * fails, behave as if -P was specified. 87 * 88 * 4701537: Only fall back if $PWD was actually wrong. We want to 89 * fail if the path is too long (errno == ENAMETOOLONG). 90 */ 91 if ((!physical && (p = getcwd_logical()) != NULL) || 92 ((physical || errno == ENOENT) && (p = getcwd(NULL, 0)) != NULL)) 93 printf("%s\n", p); 94 else 95 err(1, "."); 96 97 exit(0); 98} 99 100void 101usage(void) 102{ 103 104 (void)fprintf(stderr, "usage: pwd [-L | -P]\n"); 105 exit(1); 106} 107 108static char * 109getcwd_logical(void) 110{ 111 struct stat lg, phy; 112 char *pwd; 113 114 /* 115 * Check that $PWD is an absolute logical pathname referring to 116 * the current working directory. 117 */ 118 if ((pwd = getenv("PWD")) != NULL && *pwd == '/') { 119 if (stat(pwd, &lg) == -1 || stat(".", &phy) == -1) 120 return (NULL); 121 if (lg.st_dev == phy.st_dev && lg.st_ino == phy.st_ino) 122 return (pwd); 123 } 124 125 errno = ENOENT; 126 return (NULL); 127} 128