diff --git a/bdk/utils/sprintf.c b/bdk/utils/sprintf.c
index 68e5ad6..a5b8cef 100644
--- a/bdk/utils/sprintf.c
+++ b/bdk/utils/sprintf.c
@@ -132,4 +132,70 @@ void s_printf(char *out_buf, const char *fmt, ...)
 out:
 	**sout_buf = '\0';
 	va_end(ap);
-}
\ No newline at end of file
+}
+
+void s_vprintf(char *out_buf, const char *fmt, va_list ap)
+{
+	int fill, fcnt;
+
+	sout_buf = &out_buf;
+
+	while(*fmt)
+	{
+		if(*fmt == '%')
+		{
+			fmt++;
+			fill = 0;
+			fcnt = 0;
+			if ((*fmt >= '0' && *fmt <= '9') || *fmt == ' ')
+			{
+				fcnt = *fmt;
+				fmt++;
+				if (*fmt >= '0' && *fmt <= '9')
+				{
+					fill = fcnt;
+					fcnt = *fmt - '0';
+					fmt++;
+				}
+				else
+				{
+					fill = ' ';
+					fcnt -= '0';
+				}
+			}
+			switch(*fmt)
+			{
+			case 'c':
+				_s_putc(va_arg(ap, u32));
+				break;
+			case 's':
+				_s_puts(va_arg(ap, char *));
+				break;
+			case 'd':
+				_s_putn(va_arg(ap, u32), 10, fill, fcnt);
+				break;
+			case 'p':
+			case 'P':
+			case 'x':
+			case 'X':
+				_s_putn(va_arg(ap, u32), 16, fill, fcnt);
+				break;
+			case '%':
+				_s_putc('%');
+				break;
+			case '\0':
+				goto out;
+			default:
+				_s_putc('%');
+				_s_putc(*fmt);
+				break;
+			}
+		}
+		else
+			_s_putc(*fmt);
+		fmt++;
+	}
+
+out:
+	**sout_buf = '\0';
+}
diff --git a/bdk/utils/sprintf.h b/bdk/utils/sprintf.h
index 845f9b7..412fb41 100644
--- a/bdk/utils/sprintf.h
+++ b/bdk/utils/sprintf.h
@@ -20,5 +20,6 @@
 #include <utils/types.h>
 
 void s_printf(char *out_buf, const char *fmt, ...);
+void s_vprintf(char *out_buf, const char *fmt, va_list ap);
 
 #endif
\ No newline at end of file