| 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 1.4 2004/11/07 20:54:51 eirikn 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 | 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 | fprintf(stderr, "usage: realpath [path]\n"); |
| 109 | else |
| 110 | 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 | } |