Add support for snprintf and vsnprintf. Try and make the return value a bit

more standards-compliant.

--HG--
extra : source : a19eb606871f918e3d9e195b487b5276855edc8e

lang/cem/libcc.ansi/stdio/vsnprintf.c

@@ -0,0 +1,26 @@
+/*
+ * vsprintf - print formatted output without ellipsis on an array
+ */
+/* $Id$ */
+
+#include	<stdio.h>
+#include	<stdarg.h>
+#include	"loc_incl.h"
+
+int
+vsnprintf(char *s, size_t len, const char *format, va_list arg)
+{
+	int retval;
+	FILE tmp_stream;
+
+	tmp_stream._fd     = -1;
+	tmp_stream._flags  = _IOWRITE + _IONBF + _IOWRITING;
+	tmp_stream._buf    = (unsigned char *) s;
+	tmp_stream._ptr    = (unsigned char *) s;
+	tmp_stream._count  = len;
+
+	retval = _doprnt(format, arg, &tmp_stream);
+	putc('\0',&tmp_stream);
+
+	return retval;
+}