diffutils-3.5HEADdiffutils-3.5master

1 files changed, 67 insertions, 0 deletions

diff --git a/lib/freopen.c b/lib/freopen.c
new file mode 100644
index 0000000..4cf7528
--- /dev/null
+++ b/lib/freopen.c
@@ -0,0 +1,67 @@
+/* Open a stream to a file.
+   Copyright (C) 2007-2016 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 of the License, 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, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
+
+/* If the user's config.h happens to include <stdio.h>, let it include only
+   the system's <stdio.h> here, so that orig_freopen doesn't recurse to
+   rpl_freopen.  */
+#define __need_FILE
+#include <config.h>
+
+/* Get the original definition of freopen.  It might be defined as a macro.  */
+#include <stdio.h>
+#undef __need_FILE
+
+#include <errno.h>
+
+static FILE *
+orig_freopen (const char *filename, const char *mode, FILE *stream)
+{
+  return freopen (filename, mode, stream);
+}
+
+/* Specification.  */
+/* Write "stdio.h" here, not <stdio.h>, otherwise OSF/1 5.1 DTK cc eliminates
+   this include because of the preliminary #include <stdio.h> above.  */
+#include "stdio.h"
+
+#include <string.h>
+
+FILE *
+rpl_freopen (const char *filename, const char *mode, FILE *stream)
+{
+  FILE *result;
+
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+  if (filename != NULL && strcmp (filename, "/dev/null") == 0)
+    filename = "NUL";
+#endif
+
+  /* Clear errno to check the success of freopen() with it */
+  errno = 0;
+
+  result = orig_freopen (filename, mode, stream);
+
+#ifdef __KLIBC__
+  /* On OS/2 kLIBC, freopen() returns NULL even if it is successful
+     if filename is NULL. */
+  if (!filename && !result && !errno)
+    result = stream;
+#endif
+
+  return result;
+}