1 /* $NetBSD: pwd.c,v 1.14 2001/09/16 22:11:56 wiz Exp $ */ 2 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94"; 45 #else 46 __RCSID("$NetBSD: pwd.c,v 1.14 2001/09/16 22:11:56 wiz Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/types.h> 51 #include <sys/stat.h> 52 53 #include <err.h> 54 #include <errno.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 static char *getcwd_logical(char *, size_t); 61 static void usage(void); 62 int main(int, char *[]); 63 64 int 65 main(int argc, char *argv[]) 66 { 67 int ch, lFlag; 68 const char *p; 69 70 setprogname(argv[0]); 71 lFlag = 0; 72 while ((ch = getopt(argc, argv, "LP")) != -1) 73 switch (ch) { 74 case 'L': 75 lFlag = 1; 76 break; 77 case 'P': 78 lFlag = 0; 79 break; 80 case '?': 81 default: 82 usage(); 83 } 84 argc -= optind; 85 argv += optind; 86 87 if (argc != 0) 88 usage(); 89 90 if (lFlag) 91 p = getcwd_logical(NULL, 0); 92 else 93 p = getcwd(NULL, 0); 94 95 if (p == NULL) 96 err(EXIT_FAILURE, NULL); 97 98 (void)printf("%s\n", p); 99 100 exit(EXIT_SUCCESS); 101 /* NOTREACHED */ 102 } 103 104 static char * 105 getcwd_logical(char *pt, size_t size) 106 { 107 char *pwd; 108 size_t pwdlen; 109 dev_t dev; 110 ino_t ino; 111 struct stat s; 112 113 /* Check $PWD -- if it's right, it's fast. */ 114 if ((pwd = getenv("PWD")) != NULL && pwd[0] == '/') { 115 if (stat(pwd, &s) != -1) { 116 dev = s.st_dev; 117 ino = s.st_ino; 118 if (stat(".", &s) != -1 && dev == s.st_dev && 119 ino == s.st_ino) { 120 pwdlen = strlen(pwd); 121 if (pt) { 122 if (!size) { 123 errno = EINVAL; 124 return (NULL); 125 } 126 if (pwdlen + 1 > size) { 127 errno = ERANGE; 128 return (NULL); 129 } 130 } else if ((pt = malloc(pwdlen + 1)) == NULL) 131 return (NULL); 132 (void)memmove(pt, pwd, pwdlen); 133 pt[pwdlen] = '\0'; 134 return (pt); 135 } 136 } 137 } else 138 errno = ENOENT; 139 140 return (NULL); 141 } 142 143 static void 144 usage(void) 145 { 146 (void)fprintf(stderr, "usage: %s [-LP]\n", getprogname()); 147 exit(EXIT_FAILURE); 148 /* NOTREACHED */ 149 } 150