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131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*
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* Copyright (c) 1997 Shigio Yamaguchi. All rights reserved.
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* Copyright (c) 1999 Tama Communications Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "pathconv.h" /* prototypes */
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/*
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* rel2abs: convert an relative path name into absolute.
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*
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* i) path relative path
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* i) base base directory (must be absolute path)
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* o) result result buffer
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* i) size size of result buffer
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* r) != NULL: absolute path
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* == NULL: error
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*/
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char *
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rel2abs(const char *path, const char *base, char *result, const size_t size)
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{
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const char *pp, *bp;
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/*
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* endp points the last position which is safe in the result buffer.
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*/
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const char *endp = result + size - 1;
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char *rp;
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size_t length;
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if (*path == '/') {
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if (strlen(path) >= size)
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goto erange;
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strcpy(result, path);
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goto finish;
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} else if (*base != '/' || !size) {
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errno = EINVAL;
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return (NULL);
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} else if (size == 1)
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goto erange;
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length = strlen(base);
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if (!strcmp(path, ".") || !strcmp(path, "./")) {
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if (length >= size)
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goto erange;
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strcpy(result, base);
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/*
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* rp points the last char.
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*/
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rp = result + length - 1;
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/*
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* remove the last '/'.
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*/
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if (*rp == '/') {
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if (length > 1)
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*rp = 0;
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} else
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rp++;
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/* rp point NULL char */
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if (*++path == '/') {
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/*
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* Append '/' to the tail of path name.
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*/
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*rp++ = '/';
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if (rp > endp)
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goto erange;
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*rp = 0;
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}
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goto finish;
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}
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bp = base + length;
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if (*(bp - 1) == '/')
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--bp;
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/*
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* up to root.
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*/
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for (pp = path; *pp && *pp == '.'; ) {
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if (!strncmp(pp, "../", 3)) {
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pp += 3;
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while (bp > base && *--bp != '/')
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;
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} else if (!strncmp(pp, "./", 2)) {
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pp += 2;
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} else if (!strncmp(pp, "..\0", 3)) {
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pp += 2;
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while (bp > base && *--bp != '/')
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;
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} else
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break;
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}
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/*
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* down to leaf.
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*/
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length = bp - base;
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if (length >= size)
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goto erange;
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strncpy(result, base, length);
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rp = result + length;
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if (*pp || *(pp - 1) == '/' || length == 0)
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*rp++ = '/';
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if (rp + strlen(pp) > endp)
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goto erange;
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strcpy(rp, pp);
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finish:
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return result;
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erange:
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errno = ERANGE;
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return (NULL);
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}
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