Implement printf (very simple version)

include/bits/stdio.h

@@ -1,11 +1,20 @@
 #ifndef _BITS_STDIO_H
 #define _BITS_STDIO_H
 
-int printf(const char *restrict fmt, ...) {
+int fprintf(FILE * stream, const char * fmt, ...) {
 	int ret;
 	va_list ap;
 	va_start(ap, fmt);
-	ret = vfprintf(stdout, fmt, ap);
+	ret = vfprintf(stream, fmt, ap);
+	va_end(ap);
+	return ret;
+}
+
+int printf(const char * fmt, ...) {
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vprintf(fmt, ap);
 	va_end(ap);
 	return ret;
 }