1 files changed, 32 insertions, 0 deletions
diff --git a/src/emscripten-optimizer/snprintf.h b/src/emscripten-optimizer/snprintf.h
new file mode 100644
index 000000000..2792a23a2
--- /dev/null
+++ b/src/emscripten-optimizer/snprintf.h
@@ -0,0 +1,32 @@
+#include <stdarg.h>
+
+// Visual Studio does not support C99, so emulate snprintf support for it manually.
+
+#ifdef _MSC_VER
+
+#define snprintf c99_snprintf
+
+inline int c99_vsnprintf(char* str, size_t size, const char* format, va_list ap)
+{
+	int count = -1;
+
+	if (size != 0)
+		count = _vsnprintf_s(str, size, _TRUNCATE, format, ap);
+	if (count == -1)
+		count = _vscprintf(format, ap);
+
+	return count;
+}
+
+inline int c99_snprintf(char* str, size_t size, const char* format, ...)
+{
+	int count;
+	va_list ap;
+
+	va_start(ap, format);
+	count = c99_vsnprintf(str, size, format, ap);
+	va_end(ap);
+
+	return count;
+}
+#endif