1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2010 Lennart Poettering
12 #include "alloc-util.h"
17 static void test_sparse_write_one(int fd, const char *buffer, size_t n) {
20 assert_se(lseek(fd, 0, SEEK_SET) == 0);
21 assert_se(ftruncate(fd, 0) >= 0);
22 assert_se(sparse_write(fd, buffer, n, 4) == (ssize_t) n);
24 assert_se(lseek(fd, 0, SEEK_CUR) == (off_t) n);
25 assert_se(ftruncate(fd, n) >= 0);
27 assert_se(lseek(fd, 0, SEEK_SET) == 0);
28 assert_se(read(fd, check, n) == (ssize_t) n);
30 assert_se(memcmp(buffer, check, n) == 0);
33 static void test_sparse_write(void) {
34 const char test_a[] = "test";
35 const char test_b[] = "\0\0\0\0test\0\0\0\0";
36 const char test_c[] = "\0\0test\0\0\0\0";
37 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";
38 const char test_e[] = "test\0\0\0\0test";
39 _cleanup_close_ int fd = -1;
40 char fn[] = "/tmp/sparseXXXXXX";
42 fd = mkostemp(fn, O_CLOEXEC);
46 test_sparse_write_one(fd, test_a, sizeof(test_a));
47 test_sparse_write_one(fd, test_b, sizeof(test_b));
48 test_sparse_write_one(fd, test_c, sizeof(test_c));
49 test_sparse_write_one(fd, test_d, sizeof(test_d));
50 test_sparse_write_one(fd, test_e, sizeof(test_e));