src/test/test-io-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <fcntl.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6
   7 #include "alloc-util.h"
   8 #include "fd-util.h"
   9 #include "io-util.h"
  10 #include "macro.h"
  11
  12 static void test_sparse_write_one(int fd, const char *buffer, size_t n) {
  13         char check[n];
  14
  15         assert_se(lseek(fd, 0, SEEK_SET) == 0);
  16         assert_se(ftruncate(fd, 0) >= 0);
  17         assert_se(sparse_write(fd, buffer, n, 4) == (ssize_t) n);
  18
  19         assert_se(lseek(fd, 0, SEEK_CUR) == (off_t) n);
  20         assert_se(ftruncate(fd, n) >= 0);
  21
  22         assert_se(lseek(fd, 0, SEEK_SET) == 0);
  23         assert_se(read(fd, check, n) == (ssize_t) n);
  24
  25         assert_se(memcmp(buffer, check, n) == 0);
  26 }
  27
  28 static void test_sparse_write(void) {
  29         const char test_a[] = "test";
  30         const char test_b[] = "\0\0\0\0test\0\0\0\0";
  31         const char test_c[] = "\0\0test\0\0\0\0";
  32         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";
  33         const char test_e[] = "test\0\0\0\0test";
  34         _cleanup_close_ int fd = -1;
  35         char fn[] = "/tmp/sparseXXXXXX";
  36
  37         fd = mkostemp(fn, O_CLOEXEC);
  38         assert_se(fd >= 0);
  39         unlink(fn);
  40
  41         test_sparse_write_one(fd, test_a, sizeof(test_a));
  42         test_sparse_write_one(fd, test_b, sizeof(test_b));
  43         test_sparse_write_one(fd, test_c, sizeof(test_c));
  44         test_sparse_write_one(fd, test_d, sizeof(test_d));
  45         test_sparse_write_one(fd, test_e, sizeof(test_e));
  46 }
  47
  48 int main(void) {
  49         test_sparse_write();
  50
  51         return 0;
  52 }