1 files changed, 66 insertions, 0 deletions
diff --git a/libc/stdio/freopen.c b/libc/stdio/freopen.c
new file mode 100644
index 000000000..0eccaac1f
--- /dev/null
+++ b/libc/stdio/freopen.c
@@ -0,0 +1,66 @@
+/* Copyright (C) 2004       Manuel Novoa III    <mjn3@codepoet.org>
+ *
+ * GNU Library General Public License (LGPL) version 2 or later.
+ *
+ * Dedicated to Toni.  See uClibc/DEDICATION.mjn3 for details.
+ */
+
+#include "_stdio.h"
+
+#ifdef __DO_LARGEFILE
+# ifndef __UCLIBC_HAS_LFS__
+#  error large file support is not enabled!
+# endif
+
+# define freopen		freopen64
+# define FILEDES_ARG    (-2)
+#else
+# define FILEDES_ARG    (-1)
+#endif
+
+FILE *freopen(const char * __restrict filename, const char * __restrict mode,
+			  register FILE * __restrict stream)
+{
+	/*
+	 * ANSI/ISO allow (implementation-defined) change of mode for an
+	 * existing file if filename is NULL.  It doesn't look like Linux
+	 * supports this, so we don't here.
+	 *
+	 * NOTE: Whether or not the stream is free'd on failure is unclear
+	 *       w.r.t. ANSI/ISO.  This implementation chooses to NOT free
+	 *       the stream and associated buffer if they were dynamically
+	 *       allocated.
+	 * NOTE: Previous versions of uClibc did free dynamic storage.
+	 *
+	 * TODO: Apparently linux allows setting append mode.  Implement?
+	 */
+	unsigned short dynmode;
+	register FILE *fp;
+	__STDIO_AUTO_THREADLOCK_VAR;
+
+	__STDIO_AUTO_THREADLOCK(stream);
+
+	__STDIO_STREAM_VALIDATE(stream);
+
+	/* First, flush and close, but don't deallocate, the stream. */
+	/* This also removes the stream for the open file list. */
+	dynmode = (stream->__modeflags & (__FLAG_FREEBUF|__FLAG_FREEFILE));
+
+	stream->__modeflags &= ~(__FLAG_FREEBUF|__FLAG_FREEFILE);
+
+	/* Only call fclose on the stream if it is not already closed. */
+	if ((stream->__modeflags & (__FLAG_READONLY|__FLAG_WRITEONLY))
+		!= (__FLAG_READONLY|__FLAG_WRITEONLY)
+		) {
+		fclose(stream);			/* Failures are ignored. */
+	}
+
+	fp = _stdio_fopen(((intptr_t) filename), mode, stream, FILEDES_ARG);
+
+	/* Reset the allocation flags. */
+	stream->__modeflags |= dynmode;
+
+	__STDIO_AUTO_THREADUNLOCK(stream);
+
+	return fp;
+}