From fa955f0024bc1e63200f6c6e3d22cf88dc6a65a5 Mon Sep 17 00:00:00 2001
From: tgschultz <tgschultz@gmail.com>
Date: Tue, 14 Aug 2018 12:56:41 -0500
Subject: [PATCH] fixed handling of [*]u8 when no format specifier is set

If fmt was called on with a [*]u8 or [*]const u8 argument, but the fmt string did not specify 's' to treat it as a string, it produced a compile error due to accessing index 1 of a 0 length slice.
---
 std/fmt/index.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/std/fmt/index.zig b/std/fmt/index.zig
index f4f9efee37..a9ae979323 100644
--- a/std/fmt/index.zig
+++ b/std/fmt/index.zig
@@ -179,7 +179,7 @@ pub fn formatType(
             },
             builtin.TypeInfo.Pointer.Size.Many => {
                 if (ptr_info.child == u8) {
-                    if (fmt[0] == 's') {
+                    if (fmt.len > 0 and fmt[0] == 's') {
                         const len = std.cstr.len(value);
                         return formatText(value[0..len], fmt, context, Errors, output);
                     }