1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static char const copyright[] = 35 "@(#) Copyright (c) 1991, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94"; 41 #endif /* not lint */ 42 #endif 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 #include <sys/types.h> 49 50 #include <err.h> 51 #include <errno.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <unistd.h> 55 56 static char *getcwd_logical(void); 57 void usage(void); 58 59 int 60 main(int argc, char *argv[]) 61 { 62 int physical; 63 int ch; 64 char *p; 65 66 physical = 1; 67 while ((ch = getopt(argc, argv, "LP")) != -1) 68 switch (ch) { 69 case 'L': 70 physical = 0; 71 break; 72 case 'P': 73 physical = 1; 74 break; 75 case '?': 76 default: 77 usage(); 78 } 79 argc -= optind; 80 argv += optind; 81 82 if (argc != 0) 83 usage(); 84 85 /* 86 * If we're trying to find the logical current directory and that 87 * fails, behave as if -P was specified. 88 */ 89 if ((!physical && (p = getcwd_logical()) != NULL) || 90 (p = getcwd(NULL, 0)) != NULL) 91 printf("%s\n", p); 92 else 93 err(1, "."); 94 95 exit(0); 96 } 97 98 void __dead2 99 usage(void) 100 { 101 102 (void)fprintf(stderr, "usage: pwd [-L | -P]\n"); 103 exit(1); 104 } 105 106 static char * 107 getcwd_logical(void) 108 { 109 struct stat lg, phy; 110 char *pwd; 111 112 /* 113 * Check that $PWD is an absolute logical pathname referring to 114 * the current working directory. 115 */ 116 if ((pwd = getenv("PWD")) != NULL && *pwd == '/') { 117 if (stat(pwd, &lg) == -1 || stat(".", &phy) == -1) 118 return (NULL); 119 if (lg.st_dev == phy.st_dev && lg.st_ino == phy.st_ino) 120 return (pwd); 121 } 122 123 errno = ENOENT; 124 return (NULL); 125 } 126