1 files changed, 53 insertions, 0 deletions
diff --git a/src/stdio/freopen.c b/src/stdio/freopen.c
new file mode 100644
index 00000000..cddf296a
--- /dev/null
+++ b/src/stdio/freopen.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include "errno.h"
+#include "nonstd/io.h"
+
+#ifdef _POSIX_SOURCE
+#include "fcntl.h"
+#else
+#define open(fname, flags, mode) (filename ? -1 : -1)
+#endif
+
+/** reopen a file stream with a new file **/
+FILE * freopen(const char * restrict filename, const char * restrict mode, FILE * restrict stream)
+{
+	flockfile(stream);
+	(void)mode;
+
+	int openmode = 0; /* modetoflag(mode); */
+	if (openmode == 0) {
+		#ifdef EINVAL
+		errno = EINVAL;
+		#endif
+		return NULL;
+	}
+
+	int fd = open(filename, openmode, 0);
+	if (fd == -1) {
+		/* set errno */
+		return NULL;
+	}
+
+	stream->fd = fd;
+	stream->nlocks = 0;
+
+	/*
+	RETURN_SUCCESS(ARGUMENT(stream));
+	RETURN_FAILURE(CONSTANT(NULL));
+	*/
+	return stream;
+}
+
+/***
+changes the file associated with ARGUMENT(stream) to
+ARGUMENT(filename). The meaning of ARGUMENT(mode) is the same as with
+FUNCTION(fopen).
+
+Whatever file is currently associated with ARGUMENT(stream) is closed,
+ignoring any errors.
+
+The error and end-of-file indicators are cleared.
+***/
+/*
+STDC(1)
+*/