From b7cf9dbbecc83a02603bcdd6f0c0f5da62f66508 Mon Sep 17 00:00:00 2001
From: Jeff Baker <jwbaker@gmail.com>
Date: Sun, 25 May 2025 14:51:55 -0700
Subject: [PATCH] Hot path for ascii output

---
 src/utf8.c |  2 +-
 src/utf8.h | 15 ++++++++++++++-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/utf8.c b/src/utf8.c
index da90b95a7..2daa010aa 100644
--- a/src/utf8.c
+++ b/src/utf8.c
@@ -328,7 +328,7 @@ int TY_(DecodeUTF8BytesToChar)( uint* c, uint firstByte, ctmbstr successorBytes,
     return 0;
 }
 
-int TY_(EncodeCharToUTF8Bytes)( uint c, tmbstr encodebuf,
+int TY_(EncodeCharToUTF8BytesSlow)( uint c, tmbstr encodebuf,
                                 TidyOutputSink* outp, int* count )
 {
     byte tempbuf[10] = {0};
diff --git a/src/utf8.h b/src/utf8.h
index 50664a5e0..c120397c8 100644
--- a/src/utf8.h
+++ b/src/utf8.h
@@ -18,9 +18,22 @@
 TY_PRIVATE int TY_(DecodeUTF8BytesToChar)( uint* c, uint firstByte, ctmbstr successorBytes,
                                 TidyInputSource* inp, int* count );
 
-TY_PRIVATE int TY_(EncodeCharToUTF8Bytes)( uint c, tmbstr encodebuf,
+TY_PRIVATE int TY_(EncodeCharToUTF8BytesSlow)( uint c, tmbstr encodebuf,
                                 TidyOutputSink* outp, int* count );
 
+static inline int TY_(EncodeCharToUTF8Bytes)(uint c, tmbstr encodebuf,
+                                             TidyOutputSink *outp, int *count) {
+  if (c <= 0x7F) {
+    if (encodebuf)
+      encodebuf[0] = c;
+    if (outp)
+      outp->putByte(outp->sinkData, c);
+    *count = 1;
+    return 0;
+  }
+
+  TY_(EncodeCharToUTF8BytesSlow)(c, encodebuf, outp, count);
+}
 
 TY_PRIVATE uint  TY_(GetUTF8)( ctmbstr str, uint *ch );
 TY_PRIVATE tmbstr TY_(PutUTF8)( tmbstr buf, uint c );