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Avoid GNU getcwd extension behavior

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GNU `getcwd` can allocate a buffer if passed `NULL` for it. This is an
extension which is e.g., not recognized by clang-tidy-19's
`StdCLibraryFunctions` check[^1] which emits a diagnostic on a violated
precondition `buf != NULL`,

```
The 1st argument to 'getcwd' is NULL but should not be NULL [clang-analyzer-unix.StdCLibraryFunctions,-warnings-as-errors]
[build]  3987 |     std::unique_ptr<char, decltype(&std::free)> buffer{::getcwd(NULL, 0), std::free};
```

This patch modifies this use of `getcwd` with this extension behavior to
instead use `get_current_dir_name` which is also a GNU extension, but
does not trigger this diagnostic.

[^1]: https://clang.llvm.org/docs/analyzer/checkers.html#unix-stdclibraryfunctions-c
This commit is contained in:
Benjamin Bannier 2024-12-18 15:25:52 +01:00
parent b1982f06c8
commit f43846877b
1 changed files with 1 additions and 1 deletions
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include/ghc/filesystem.hpp
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@ -4229,7 +4229,7 @@ GHC_INLINE path current_path(std::error_code& ec)
} }
return path(std::wstring(buffer.get()), path::native_format); return path(std::wstring(buffer.get()), path::native_format);
#elif defined(__GLIBC__) #elif defined(__GLIBC__)
std::unique_ptr<char, decltype(&std::free)> buffer { ::getcwd(NULL, 0), std::free }; std::unique_ptr<char, decltype(&std::free)> buffer { ::get_current_dir_name(), std::free };
if (buffer == nullptr) { if (buffer == nullptr) {
ec = detail::make_system_error(); ec = detail::make_system_error();
return path(); return path();