1 files changed, 30 insertions, 0 deletions
diff --git a/src/stdio/vsprintf.c b/src/stdio/vsprintf.c
new file mode 100644
index 00000000..4a6ec2b8
--- /dev/null
+++ b/src/stdio/vsprintf.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include "stdarg.h"
+#include "nonstd/io.h"
+#include "nonstd/internal.h"
+
+/** write formatted output to a string **/
+int vsprintf(char *s, const char *format, va_list arg)
+{
+	int ret = 0;
+	struct io_options opt = {0};
+	opt.fnname = "fprintf";
+	opt.string = s;
+	opt.maxlen = (size_t)-1;
+	ret = __printf(&opt, format, arg);
+	/*
+	RETURN_SUCCESS(the number of characters written, not including the final CHAR(\0));
+	*/
+	return ret;
+}
+
+/***
+is equivalent to fn(sprintf), but with a TYPEDEF(va_list)
+argument instead of variadic arguments. The argument ARGUMENT(arg) must be
+initialized with FUNCTION(va_start) prior to calling THIS(). The
+THIS() function does not call FUNCTION(va_end), so the calling function is
+responsible for this.
+***/
+/*
+STDC(1)
+*/