[PATCH] D129223: [Clang] Fix invalid utf-8 detection

[Corentin Jabot via Phabricator via cfe-commits]

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The length of valid codepoints was incorrectly
calculated which was not caught before because the
absence of tests for the valid codepoints scenario.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D129223

Files:
  clang/test/Lexer/comment-invalid-utf8.c
  llvm/lib/Support/ConvertUTF.cpp


Index: llvm/lib/Support/ConvertUTF.cpp
===================================================================
--- llvm/lib/Support/ConvertUTF.cpp
+++ llvm/lib/Support/ConvertUTF.cpp
@@ -423,7 +423,7 @@
  */
 unsigned getUTF8SequenceSize(const UTF8 *source, const UTF8 *sourceEnd) {
   int length = trailingBytesForUTF8[*source] + 1;
-  return (length > sourceEnd - source && isLegalUTF8(source, length)) ? length
+  return (length < sourceEnd - source && isLegalUTF8(source, length)) ? length
                                                                       : 0;
 }
 



Index: llvm/lib/Support/ConvertUTF.cpp
===================================================================
--- llvm/lib/Support/ConvertUTF.cpp
+++ llvm/lib/Support/ConvertUTF.cpp
@@ -423,7 +423,7 @@
  */
 unsigned getUTF8SequenceSize(const UTF8 *source, const UTF8 *sourceEnd) {
   int length = trailingBytesForUTF8[*source] + 1;
-  return (length > sourceEnd - source && isLegalUTF8(source, length)) ? length
+  return (length < sourceEnd - source && isLegalUTF8(source, length)) ? length
                                                                       : 0;
 }
 

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