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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1991, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)pwd.c 8.3 (Berkeley) 4/1/94 35 * $FreeBSD: src/bin/pwd/pwd.c,v 1.9.2.3 2002/06/17 11:04:22 tjr Exp $ 36 * $DragonFly: src/bin/pwd/pwd.c,v 1.3 2004/01/28 16:25:29 joerg Exp $ 37 */ 38 39 #include <sys/types.h> 40 #include <sys/stat.h> 41 42 #include <err.h> 43 #include <errno.h> 44 #include <limits.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 #include <sys/param.h> 50 51 static char *getcwd_logical(void); 52 void usage(void); 53 54 int 55 main(int argc, char *argv[]) 56 { 57 int physical; 58 int ch; 59 char *p; 60 char buf[PATH_MAX]; 61 62 if (strcmp(getprogname(), "realpath") == 0) { 63 if (argc != 2) 64 usage(); 65 if ((p = realpath(argv[1], buf)) == NULL) 66 err(1, "%s", argv[1]); 67 (void)printf("%s\n", p); 68 exit(0); 69 } 70 71 physical = 1; 72 while ((ch = getopt(argc, argv, "LP")) != -1) 73 switch (ch) { 74 case 'L': 75 physical = 0; 76 break; 77 case 'P': 78 physical = 1; 79 break; 80 case '?': 81 default: 82 usage(); 83 } 84 argc -= optind; 85 argv += optind; 86 87 if (argc != 0) 88 usage(); 89 90 /* 91 * If we're trying to find the logical current directory and that 92 * fails, behave as if -P was specified. 93 */ 94 if ((!physical && (p = getcwd_logical()) != NULL) || 95 (p = getcwd(NULL, 0)) != NULL) 96 printf("%s\n", p); 97 else 98 err(1, "."); 99 100 exit(0); 101 } 102 103 void 104 usage(void) 105 { 106 107 if (strcmp(getprogname(), "realpath") == 0) 108 (void)fprintf(stderr, "usage: realpath [path]\n"); 109 else 110 (void)fprintf(stderr, "usage: pwd [-LP]\n"); 111 exit(1); 112 } 113 114 static char * 115 getcwd_logical(void) 116 { 117 struct stat logic, phy; 118 char *pwd; 119 120 /* 121 * Check that $PWD is an absolute logical pathname referring to 122 * the current working directory. 123 */ 124 if ((pwd = getenv("PWD")) != NULL && *pwd == '/') { 125 if (stat(pwd, &logic) == -1 || stat(".", &phy) == -1) 126 return (NULL); 127 if (logic.st_dev == phy.st_dev && logic.st_ino == phy.st_ino) 128 return (pwd); 129 } 130 131 errno = ENOENT; 132 return (NULL); 133 } 134