1 files changed, 88 insertions, 0 deletions
diff --git a/posix/tst-truncate-common.c b/posix/tst-truncate-common.c
new file mode 100644
index 0000000000..80bf277074
--- /dev/null
+++ b/posix/tst-truncate-common.c
@@ -0,0 +1,88 @@
+/* Common f{truncate} tests definitions.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library 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.
+
+   The GNU C Library 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 the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+static void do_prepare (void);
+#define PREPARE(argc, argv)     do_prepare ()
+static int do_test (void);
+#define TEST_FUNCTION           do_test ()
+
+#include <test-skeleton.c>
+
+static char *temp_filename;
+static int temp_fd;
+
+static void
+do_prepare (void)
+{
+  temp_fd = create_temp_file ("tst-trucate.", &temp_filename);
+  if (temp_fd == -1)
+    {
+      printf ("cannot create temporary file: %m\n");
+      exit (1);
+    }
+}
+
+#define FAIL(str) \
+  do { printf ("error: %s (line %d)\n", str, __LINE__); return 1; } while (0)
+
+static int
+do_test_with_offset (off_t offset)
+{
+  struct stat st;
+  char buf[1000];
+
+  memset (buf, 0xcf, sizeof (buf));
+
+  if (pwrite (temp_fd, buf, sizeof (buf), offset) != sizeof (buf))
+    FAIL ("write failed");
+  if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + sizeof (buf)))
+    FAIL ("initial size wrong");
+
+  if (ftruncate (temp_fd, offset + 800) < 0)
+    FAIL ("size reduction with ftruncate failed");
+  if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 800))
+    FAIL ("size after reduction with ftruncate is incorrect");
+
+  /* The following test covers more than POSIX.  POSIX does not require
+     that ftruncate() can increase the file size.  But we are testing
+     Unix systems.  */
+  if (ftruncate (temp_fd, offset + 1200) < 0)
+    FAIL ("size increate with ftruncate failed");
+  if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 1200))
+    FAIL ("size after increase is incorrect");
+
+  if (truncate (temp_filename, offset + 800) < 0)
+    FAIL ("size reduction with truncate failed");
+  if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 800))
+    FAIL ("size after reduction with truncate incorrect");
+
+  /* The following test covers more than POSIX.  POSIX does not require
+     that truncate() can increase the file size.  But we are testing
+     Unix systems.  */
+  if (truncate (temp_filename, (offset + 1200)) < 0)
+    FAIL ("size increase with truncate failed");
+  if (fstat (temp_fd, &st) < 0 || st.st_size != (offset + 1200))
+    FAIL ("size increase with truncate is incorrect");
+
+  return 0;
+}