1 files changed, 48 insertions, 0 deletions
diff --git a/src/stdio/setvbuf.c b/src/stdio/setvbuf.c
new file mode 100644
index 00000000..0db67cda
--- /dev/null
+++ b/src/stdio/setvbuf.c
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include "stdlib.h"
+#include "nonstd/io.h"
+
+/** specify file stream buffering options **/
+int setvbuf(FILE *stream, char *buf, int mode, size_t size)
+{
+	if (stream == NULL
+	   || !stream->isopen
+	   || stream->buftype != UNSET
+	   || (mode != _IOFBF && mode != _IOLBF && mode != _IONBF))
+	{
+		return 1;
+	}
+
+	stream->buffering = mode;
+	stream->bsize = size;
+
+	if (buf != NULL) {
+		stream->buf = buf;
+		stream->buftype = SUPPLIED;
+	} else if (mode != _IONBF) {
+		stream->buf = calloc(size, sizeof(char));
+		stream->buftype = ALLOCED;
+	}
+	
+	return 0;
+}
+
+/***
+function sets the type of buffering for a file stream, along
+with the size and location of the buffer. It must be called before any other
+operations are performed.
+
+The type of buffering is specified by ARGUMENT(mode):
+FLAG(CONSTANT(_IOFBF), fully buffered)
+FLAG(CONSTANT(_IOLBF), line buffered)
+FLAG(CONSTANT(_IONBF), unbuffered)
+
+If ARGUMENT(buf) is CONSTANT(NULL), THIS() will automatically allocate an
+appropriate buffer. If ARGUMENT(buf) is not CONSTANT(NULL), it must point to
+an array of at least ARGUMENT(size) characters.
+
+The ARGUMENT(size) argument specifies the size of the buffer.
+***/
+/*
+STDC(1)
+*/