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 <err.h> 49 #include <limits.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <unistd.h> 53 #include <sys/param.h> 54 55 int main __P((int, char *[])); 56 void usage __P((void)); 57 58 int 59 main(argc, argv) 60 int argc; 61 char *argv[]; 62 { 63 int ch; 64 char *p; 65 char buf[PATH_MAX]; 66 67 /* 68 * Flags for pwd are a bit strange. The POSIX 1003.2B/D9 document 69 * has an optional -P flag for physical, which is what this program 70 * will produce by default. The logical flag, -L, should fail, as 71 * there's no way to display a logical path after forking. 72 */ 73 while ((ch = getopt(argc, argv, "P")) != -1) 74 switch (ch) { 75 case 'P': 76 break; 77 case '?': 78 default: 79 usage(); 80 } 81 argc -= optind; 82 argv += optind; 83 84 if (argc == 1) { 85 p = realpath(argv[0], buf); 86 if (p == NULL) 87 err(1, "%s", argv[0]); 88 (void)printf("%s\n", p); 89 } else if (argc == 0) { 90 p = getcwd(NULL, (size_t)0); 91 if (p == NULL) 92 err(1, "."); 93 (void)printf("%s\n", p); 94 } else { 95 usage(); 96 } 97 98 exit(0); 99 } 100 101 void 102 usage() 103 { 104 105 (void)fprintf(stderr, "usage: pwd\n"); 106 exit(1); 107 } 108