posix/tst-truncate-common.c

   1 /* Common f{truncate} tests definitions.
   2    Copyright (C) 2016-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <unistd.h>
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <unistd.h>
  23
  24 static void do_prepare (void);
  25 #define PREPARE(argc, argv)     do_prepare ()
  26 static int do_test (void);
  27 #define TEST_FUNCTION           do_test ()
  28
  29 #include <test-skeleton.c>
  30
  31 static char *temp_filename;
  32 static int temp_fd;
  33
  34 static void
  35 do_prepare (void)
  36 {
  37   temp_fd = create_temp_file ("tst-trucate.", &temp_filename);
  38   if (temp_fd == -1)
  39     {
  40       printf ("cannot create temporary file: %m\n");
  41       exit (1);
  42     }
  43 }
  44
  45 #define FAIL(str) \
  46   do { printf ("error: %s (line %d)\n", str, __LINE__); return 1; } while (0)
  47
  48 static int
  49 do_test_with_offset (off_t offset)
  50 {
  51   struct stat st;
  52   char buf[1000];
  53
  54   memset (buf, 0xcf, sizeof (buf));
  55
  56   if (pwrite (temp_fd, buf, sizeof (buf), offset) != sizeof (buf))
  57     FAIL ("write failed");
  58   if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + sizeof (buf)))
  59     FAIL ("initial size wrong");
  60
  61   if (ftruncate (temp_fd, offset + 800) < 0)
  62     FAIL ("size reduction with ftruncate failed");
  63   if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 800))
  64     FAIL ("size after reduction with ftruncate is incorrect");
  65
  66   /* The following test covers more than POSIX.  POSIX does not require
  67      that ftruncate() can increase the file size.  But we are testing
  68      Unix systems.  */
  69   if (ftruncate (temp_fd, offset + 1200) < 0)
  70     FAIL ("size increate with ftruncate failed");
  71   if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 1200))
  72     FAIL ("size after increase is incorrect");
  73
  74   if (truncate (temp_filename, offset + 800) < 0)
  75     FAIL ("size reduction with truncate failed");
  76   if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 800))
  77     FAIL ("size after reduction with truncate incorrect");
  78
  79   /* The following test covers more than POSIX.  POSIX does not require
  80      that truncate() can increase the file size.  But we are testing
  81      Unix systems.  */
  82   if (truncate (temp_filename, (offset + 1200)) < 0)
  83     FAIL ("size increase with truncate failed");
  84   if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 1200))
  85     FAIL ("size increase with truncate is incorrect");
  86
  87   return 0;
  88 }