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94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*
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zip_mkstempm.c -- mkstemp replacement that accepts a mode argument
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Copyright (C) 2019 Dieter Baron and Thomas Klausner
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This file is part of libzip, a library to manipulate ZIP archives.
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The authors can be contacted at <libzip@nih.at>
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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
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the documentation and/or other materials provided with the
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distribution.
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3. The names of the authors may not be used to endorse or promote
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products derived from this software without specific prior
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written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/stat.h>
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#include "zipint.h"
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/*
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* create temporary file with same permissions as previous one;
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* or default permissions if there is no previous file
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*/
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int
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_zip_mkstempm(char *path, int mode) {
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int fd;
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char *start, *end, *xs;
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int xcnt = 0;
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end = path + strlen(path);
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start = end - 1;
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while (start >= path && *start == 'X') {
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xcnt++;
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start--;
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}
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if (xcnt == 0) {
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errno = EINVAL;
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return -1;
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}
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start++;
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for (;;) {
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zip_uint32_t value = zip_random_uint32();
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xs = start;
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while (xs < end) {
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char digit = value % 36;
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if (digit < 10) {
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*(xs++) = digit + '0';
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}
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else {
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*(xs++) = digit - 10 + 'a';
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}
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value /= 36;
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}
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if ((fd = open(path, O_CREAT | O_EXCL | O_RDWR | O_CLOEXEC, mode == -1 ? 0666 : (mode_t)mode)) >= 0) {
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if (mode != -1) {
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/* open() honors umask(), which we don't want in this case */
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(void)chmod(path, (mode_t)mode);
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}
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return fd;
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}
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if (errno != EEXIST) {
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return -1;
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}
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}
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}
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