88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* 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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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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 <libgen.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/param.h>
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int
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dirname_r(const char* path, char* buffer, size_t bufflen)
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{
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const char *endp;
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int result, len;
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/* Empty or NULL string gets treated as "." */
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if (path == NULL || *path == '\0') {
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path = ".";
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len = 1;
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goto Exit;
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}
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/* Strip trailing slashes */
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endp = path + strlen(path) - 1;
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while (endp > path && *endp == '/')
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endp--;
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/* Find the start of the dir */
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while (endp > path && *endp != '/')
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endp--;
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/* Either the dir is "/" or there are no slashes */
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if (endp == path) {
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path = (*endp == '/') ? "/" : ".";
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len = 1;
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goto Exit;
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}
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do {
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endp--;
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} while (endp > path && *endp == '/');
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len = endp - path +1;
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Exit:
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result = len;
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if (len+1 > MAXPATHLEN) {
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errno = ENAMETOOLONG;
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return -1;
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}
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if (buffer == NULL)
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return result;
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if (len > (int)bufflen-1) {
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len = (int)bufflen-1;
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result = -1;
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errno = ERANGE;
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}
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if (len >= 0) {
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memcpy( buffer, path, len );
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buffer[len] = 0;
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}
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return result;
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}
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