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/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include "systemd-basic/alloc-util.h"
#include "systemd-basic/fd-util.h"
#include "systemd-basic/io-util.h"
#include "systemd-basic/macro.h"
static void test_sparse_write_one(int fd, const char *buffer, size_t n) {
char check[n];
assert_se(lseek(fd, 0, SEEK_SET) == 0);
assert_se(ftruncate(fd, 0) >= 0);
assert_se(sparse_write(fd, buffer, n, 4) == (ssize_t) n);
assert_se(lseek(fd, 0, SEEK_CUR) == (off_t) n);
assert_se(ftruncate(fd, n) >= 0);
assert_se(lseek(fd, 0, SEEK_SET) == 0);
assert_se(read(fd, check, n) == (ssize_t) n);
assert_se(memcmp(buffer, check, n) == 0);
}
static void test_sparse_write(void) {
const char test_a[] = "test";
const char test_b[] = "\0\0\0\0test\0\0\0\0";
const char test_c[] = "\0\0test\0\0\0\0";
const char test_d[] = "\0\0test\0\0\0test\0\0\0\0test\0\0\0\0\0test\0\0\0test\0\0\0\0test\0\0\0\0\0\0\0\0";
const char test_e[] = "test\0\0\0\0test";
_cleanup_close_ int fd = -1;
char fn[] = "/tmp/sparseXXXXXX";
fd = mkostemp(fn, O_CLOEXEC);
assert_se(fd >= 0);
unlink(fn);
test_sparse_write_one(fd, test_a, sizeof(test_a));
test_sparse_write_one(fd, test_b, sizeof(test_b));
test_sparse_write_one(fd, test_c, sizeof(test_c));
test_sparse_write_one(fd, test_d, sizeof(test_d));
test_sparse_write_one(fd, test_e, sizeof(test_e));
}
int main(void) {
test_sparse_write();
return 0;
}
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