Tests for function fwrite().

* modules/fwrite-tests: New file.
* tests/test-fwrite.c: New file.
* modules/stdio-tests (Depends-on): Add fwrite-tests.

4 files changed, 102 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 9670e065ba..a044b4e709 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2011-09-24  Bruno Haible  <bruno@clisp.org>
 
+	Tests for function fwrite().
+	* modules/fwrite-tests: New file.
+	* tests/test-fwrite.c: New file.
+	* modules/stdio-tests (Depends-on): Add fwrite-tests.
+
 	Tests for function fread().
 	* modules/fread-tests: New file.
 	* tests/test-fread.c: New file.
diff --git a/modules/fwrite-tests b/modules/fwrite-tests
new file mode 100644
index 0000000000..496fe80019
--- /dev/null
+++ b/modules/fwrite-tests
@@ -0,0 +1,12 @@
+Files:
+tests/test-fwrite.c
+tests/signature.h
+tests/macros.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-fwrite
+check_PROGRAMS += test-fwrite
diff --git a/modules/stdio-tests b/modules/stdio-tests
index 68f2ffd584..fcda690b7a 100644
--- a/modules/stdio-tests
+++ b/modules/stdio-tests
@@ -7,6 +7,7 @@ stdio-c++-tests
 fgetc-tests
 fputc-tests
 fread-tests
+fwrite-tests
 
 configure.ac:
 
diff --git a/tests/test-fwrite.c b/tests/test-fwrite.c
new file mode 100644
index 0000000000..d5d47a1266
--- /dev/null
+++ b/tests/test-fwrite.c
@@ -0,0 +1,84 @@
+/* Test of fwrite() function.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include <config.h>
+
+#include <stdio.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (fwrite, size_t, (const void *, size_t, size_t, FILE *));
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "macros.h"
+
+int
+main (int argc, char **argv)
+{
+  const char *filename = "test-fwrite.txt";
+
+  /* Test that fwrite() on an unbuffered stream sets errno if someone else
+     closes the stream fd behind the back of stdio.  */
+  {
+    FILE *fp = fopen (filename, "w");
+    char buf[5] = "world";
+    ASSERT (fp != NULL);
+    setvbuf (fp, NULL, _IONBF, 0);
+    ASSERT (close (fileno (fp)) == 0);
+    errno = 0;
+    ASSERT (fwrite (buf, 1, sizeof (buf), fp) == 0);
+    ASSERT (errno == EBADF);
+    ASSERT (ferror (fp));
+    fclose (fp);
+  }
+
+  /* Test that fwrite() on an unbuffered stream sets errno if the stream
+     was constructed with an invalid file descriptor.  */
+  {
+    FILE *fp = fdopen (-1, "w");
+    if (fp != NULL)
+      {
+        char buf[5] = "world";
+        setvbuf (fp, NULL, _IONBF, 0);
+        errno = 0;
+        ASSERT (fwrite (buf, 1, sizeof (buf), fp) == 0);
+        ASSERT (errno == EBADF);
+        ASSERT (ferror (fp));
+        fclose (fp);
+      }
+  }
+  {
+    FILE *fp = fdopen (99, "w");
+    if (fp != NULL)
+      {
+        char buf[5] = "world";
+        setvbuf (fp, NULL, _IONBF, 0);
+        errno = 0;
+        ASSERT (fwrite (buf, 1, sizeof (buf), fp) == 0);
+        ASSERT (errno == EBADF);
+        ASSERT (ferror (fp));
+        fclose (fp);
+      }
+  }
+
+  /* Clean up.  */
+  unlink (filename);
+
+  return 0;
+}