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 * 3. 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 * @(#) Copyright (c) 1991, 1993, 1994 The Regents of the University of California. All rights reserved. 30 * @(#)pwd.c 8.3 (Berkeley) 4/1/94 31 * $FreeBSD: src/bin/pwd/pwd.c,v 1.9.2.3 2002/06/17 11:04:22 tjr Exp $ 32 * $DragonFly: src/bin/pwd/pwd.c,v 1.5 2005/03/05 21:58:20 liamfoy Exp $ 33 */ 34 35 #include <sys/param.h> 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <limits.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 static char *getcwd_logical(void); 48 static void usage(void); 49 50 int 51 main(int argc, char *argv[]) 52 { 53 int physical; 54 int ch; 55 char *p; 56 char buf[PATH_MAX]; 57 58 if (strcmp(getprogname(), "realpath") == 0) { 59 if (argc != 2) 60 usage(); 61 if ((p = realpath(argv[1], buf)) == NULL) 62 err(1, "%s", argv[1]); 63 printf("%s\n", p); 64 exit(0); 65 } 66 67 physical = 1; 68 while ((ch = getopt(argc, argv, "LP")) != -1) 69 switch (ch) { 70 case 'L': 71 physical = 0; 72 break; 73 case 'P': 74 physical = 1; 75 break; 76 case '?': 77 default: 78 usage(); 79 } 80 argc -= optind; 81 argv += optind; 82 83 if (argc != 0) 84 usage(); 85 86 /* 87 * If we're trying to find the logical current directory and that 88 * fails, behave as if -P was specified. 89 */ 90 if ((!physical && (p = getcwd_logical()) != NULL) || 91 (p = getcwd(NULL, 0)) != NULL) 92 printf("%s\n", p); 93 else 94 err(1, "."); 95 96 exit(0); 97 } 98 99 static void 100 usage(void) 101 { 102 if (strcmp(getprogname(), "realpath") == 0) 103 fprintf(stderr, "usage: realpath [path]\n"); 104 else 105 fprintf(stderr, "usage: pwd [-LP]\n"); 106 exit(1); 107 } 108 109 static char * 110 getcwd_logical(void) 111 { 112 struct stat logic, phy; 113 char *pwd; 114 115 /* 116 * Check that $PWD is an absolute logical pathname referring to 117 * the current working directory. 118 */ 119 if ((pwd = getenv("PWD")) != NULL && *pwd == '/') { 120 if (stat(pwd, &logic) == -1 || stat(".", &phy) == -1) 121 return (NULL); 122 if (logic.st_dev == phy.st_dev && logic.st_ino == phy.st_ino) 123 return (pwd); 124 } 125 126 errno = ENOENT; 127 return (NULL); 128 } 129