From d77ee373c1f1b4156c60dd1fe486d779c28263c9 Mon Sep 17 00:00:00 2001
From: Meghan Denny <hello@nektro.net>
Date: Wed, 9 Aug 2023 20:37:13 -0700
Subject: [PATCH] add safeAddWrap

---
 src/lib.zig | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/lib.zig b/src/lib.zig
index 6f217856fa283a3f1900fbc6a1749021d9cd33dc..8ce19859c0cb966f3051dc6be4813d6e5bbceba7 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -454,6 +454,14 @@ pub fn safeAdd(a: anytype, b: anytype) @TypeOf(a) {
     return a - @as(@TypeOf(a), @intCast(-@as(OneBiggerInt(@TypeOf(b)), b)));
 }
 
+/// Allows u32 + i16 to work
+pub fn safeAddWrap(a: anytype, b: anytype) @TypeOf(a) {
+    if (b >= 0) {
+        return a +% @as(@TypeOf(a), @intCast(b));
+    }
+    return a -% @as(@TypeOf(a), @intCast(-@as(OneBiggerInt(@TypeOf(b)), b)));
+}
+
 pub fn readBytesAlloc(reader: anytype, alloc: std.mem.Allocator, len: usize) ![]u8 {
     var list = std.ArrayListUnmanaged(u8){};
     try list.ensureTotalCapacityPrecise(alloc, len);
-- 
2.54.0