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