2 * Copyright (c) 1997 Shigio Yamaguchi. All rights reserved.
3 * Copyright (c) 1999 Tama Communications Corporation. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
31 #include "pathconv.h" /* prototypes */
33 * abs2rel: convert an absolute path name into relative.
35 * i) path absolute path
36 * i) base base directory (must be absolute path)
37 * o) result result buffer
38 * i) size size of result buffer
39 * r) != NULL: relative path
43 abs2rel(const char *path, const char *base, char *result, const size_t size)
45 const char *pp, *bp, *branch;
47 * endp points the last position which is safe in the result buffer.
49 const char *endp = result + size - 1;
53 if (strlen(path) >= size)
57 } else if (*base != '/' || !size) {
63 * seek to branched point.
66 for (pp = path, bp = base; *pp && *bp && *pp == *bp; pp++, bp++)
69 if ((*pp == 0 || (*pp == '/' && *(pp + 1) == 0)) &&
70 (*bp == 0 || (*bp == '/' && *(bp + 1) == 0))) {
73 if (*pp == '/' || *(pp - 1) == '/')
80 if ((*pp == 0 && *bp == '/') || (*pp == '/' && *bp == 0))
86 for (bp = base + (branch - path); *bp; bp++)
87 if (*bp == '/' && *(bp + 1) != 0) {
101 if (rp + strlen(branch + 1) > endp)
103 strcpy(rp, branch + 1);