1 /* 2 * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com> 3 * 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $DragonFly: src/usr.bin/relpath/relpath.c,v 1.1 2003/09/08 23:38:44 dillon Exp $ 27 * 28 * relpath base path 29 * 30 * This program returns a path for 'path' which is relative to the specified 31 * base. 32 */ 33 34 #include <sys/types.h> 35 #include <sys/stat.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 int 42 main(int ac, char **av) 43 { 44 char *path; 45 char *rbase; 46 struct stat st1; 47 struct stat st2; 48 int error; 49 50 if (ac != 3) { 51 fprintf(stderr, "%s base path\n", av[0]); 52 fprintf(stderr, "\treturns a relative path for path from base\n"); 53 exit(1); 54 } 55 if (stat(av[1], &st1) < 0) { 56 fprintf(stderr, "Unable to stat %s\n", av[1]); 57 exit(1); 58 } 59 path = strdup(av[2]); 60 rbase = path + strlen(path); 61 for (;;) { 62 while (rbase > path && rbase[-1] != '/') 63 --rbase; 64 if (rbase == path) 65 break; 66 --rbase; 67 *rbase = 0; 68 error = stat(path, &st2); 69 *rbase = '/'; 70 if (error == 0 && 71 st2.st_dev == st1.st_dev && 72 st2.st_ino == st1.st_ino 73 ) { 74 printf("%s\n", rbase + 1); 75 exit(0); 76 } 77 } 78 fprintf(stderr, "%s is not a subdirectory of %s\n", av[2], av[1]); 79 exit(1); 80 } 81 82