[libc-commits] [libc] [libc] fix oob and overflow bugs in wcslcat and wcsncat (PR #203697)

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github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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<details>
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You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- libc/src/wchar/wcslcat.cpp libc/src/wchar/wcsncat.cpp --diff_from_common_commit
``````````

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The reproduction instructions above might return results for more than one PR
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changing `origin/main` to the base branch/commit you want to compare against.
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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/libc/src/wchar/wcslcat.cpp b/libc/src/wchar/wcslcat.cpp
index 374b47c8b..c0ef7ffaa 100644
--- a/libc/src/wchar/wcslcat.cpp
+++ b/libc/src/wchar/wcslcat.cpp
@@ -21,7 +21,7 @@ LLVM_LIBC_FUNCTION(size_t, wcslcat,
                     size_t dstsize)) {
   const size_t dstlen = internal::string_length(dst);
   const size_t srclen = internal::string_length(src);
-  if (dstlen >= dstsize) 
+  if (dstlen >= dstsize)
     return dstsize + srclen;
   int limit = static_cast<int>(dstsize - dstlen - 1);
   size_t returnval = (dstsize < dstlen ? dstsize : dstlen) + srclen;

``````````

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https://github.com/llvm/llvm-project/pull/203697