From 440e55a6af6a9c82623d9621cf291f08c47e8c1d Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Fri, 22 Jul 2022 18:32:00 -0700
Subject: [PATCH] Factor out WIDTH_AT macro

---
 src/emitter.rs | 20 +-------------------
 src/macros.rs  | 20 +++++++++++++++++++-
 2 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/src/emitter.rs b/src/emitter.rs
index 6e016ff..1e60b5c 100644
--- a/src/emitter.rs
+++ b/src/emitter.rs
@@ -2500,25 +2500,7 @@ unsafe fn yaml_emitter_write_folded_scalar(
             {
                 let mut k: libc::c_int = 0_i32;
                 while IS_BREAK_AT!(string, k as isize) {
-                    k += if *string.pointer.wrapping_offset(k as isize) as libc::c_int & 0x80_i32
-                        == 0_i32
-                    {
-                        1_i32
-                    } else if *string.pointer.wrapping_offset(k as isize) as libc::c_int & 0xe0_i32
-                        == 0xc0_i32
-                    {
-                        2_i32
-                    } else if *string.pointer.wrapping_offset(k as isize) as libc::c_int & 0xf0_i32
-                        == 0xe0_i32
-                    {
-                        3_i32
-                    } else if *string.pointer.wrapping_offset(k as isize) as libc::c_int & 0xf8_i32
-                        == 0xf0_i32
-                    {
-                        4_i32
-                    } else {
-                        0_i32
-                    };
+                    k += WIDTH_AT!(string, k as isize);
                 }
                 if !IS_BLANKZ_AT!(string, k) {
                     if !(PUT_BREAK!(emitter)) {
diff --git a/src/macros.rs b/src/macros.rs
index bb757a5..6ca396b 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -351,7 +351,25 @@ macro_rules! IS_BLANKZ {
 }
 
 macro_rules! WIDTH_AT {
-    () => {}; // TODO
+    ($string:expr, $offset:expr) => {
+        if *$string.pointer.wrapping_offset($offset as isize) as libc::c_int & 0x80_i32 == 0_i32 {
+            1_i32
+        } else if *$string.pointer.wrapping_offset($offset as isize) as libc::c_int & 0xe0_i32
+            == 0xc0_i32
+        {
+            2_i32
+        } else if *$string.pointer.wrapping_offset($offset as isize) as libc::c_int & 0xf0_i32
+            == 0xe0_i32
+        {
+            3_i32
+        } else if *$string.pointer.wrapping_offset($offset as isize) as libc::c_int & 0xf8_i32
+            == 0xf0_i32
+        {
+            4_i32
+        } else {
+            0_i32
+        }
+    };
 }
 
 macro_rules! WIDTH {