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 34 #ifndef lint 35 static char const copyright[] = 36 "@(#) Copyright (c) 1991, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 #include <sys/param.h> 49 #include <sys/stat.h> 50 #include <sys/types.h> 51 52 #include <err.h> 53 #include <errno.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <unistd.h> 57 58 static char *getcwd_logical(void); 59 void usage(void); 60 61 int 62 main(int argc, char *argv[]) 63 { 64 int Lflag, Pflag; 65 int ch; 66 char *p; 67 68 Lflag = Pflag = 0; 69 while ((ch = getopt(argc, argv, "LP")) != -1) 70 switch (ch) { 71 case 'L': 72 Lflag = 1; 73 break; 74 case 'P': 75 Pflag = 1; 76 break; 77 case '?': 78 default: 79 usage(); 80 } 81 argc -= optind; 82 argv += optind; 83 84 if (argc != 0 || (Lflag && Pflag)) 85 usage(); 86 87 p = Lflag ? getcwd_logical() : getcwd(NULL, 0); 88 if (p == NULL) 89 err(1, "."); 90 (void)printf("%s\n", p); 91 92 exit(0); 93 } 94 95 void 96 usage(void) 97 { 98 99 (void)fprintf(stderr, "usage: pwd [-L | -P]\n"); 100 exit(1); 101 } 102 103 static char * 104 getcwd_logical(void) 105 { 106 struct stat log, phy; 107 char *pwd; 108 109 /* 110 * Check that $PWD is an absolute logical pathname referring to 111 * the current working directory. 112 */ 113 if ((pwd = getenv("PWD")) != NULL && *pwd == '/') { 114 if (stat(pwd, &log) == -1 || stat(".", &phy) == -1) 115 return (NULL); 116 if (log.st_dev == phy.st_dev && log.st_ino == phy.st_ino) 117 return (pwd); 118 } 119 120 errno = ENOENT; 121 return (NULL); 122 } 123