diff options
Diffstat (limited to 'contrib/llvm-project/llvm/include/llvm/Support/Path.h')
| -rw-r--r-- | contrib/llvm-project/llvm/include/llvm/Support/Path.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/include/llvm/Support/Path.h b/contrib/llvm-project/llvm/include/llvm/Support/Path.h index 83bca5b70bc2..af70e086a1b6 100644 --- a/contrib/llvm-project/llvm/include/llvm/Support/Path.h +++ b/contrib/llvm-project/llvm/include/llvm/Support/Path.h @@ -451,10 +451,48 @@ bool has_extension(const Twine &path, Style style = Style::native); /// Is path absolute? /// +/// According to cppreference.com, C++17 states: "An absolute path is a path +/// that unambiguously identifies the location of a file without reference to +/// an additional starting location." +/// +/// In other words, the rules are: +/// 1) POSIX style paths with nonempty root directory are absolute. +/// 2) Windows style paths with nonempty root name and root directory are +/// absolute. +/// 3) No other paths are absolute. +/// +/// \see has_root_name +/// \see has_root_directory +/// /// @param path Input path. /// @result True if the path is absolute, false if it is not. bool is_absolute(const Twine &path, Style style = Style::native); +/// Is path absolute using GNU rules? +/// +/// GNU rules are: +/// 1) Paths starting with a path separator are absolute. +/// 2) Windows style paths are also absolute if they start with a character +/// followed by ':'. +/// 3) No other paths are absolute. +/// +/// On Windows style the path "C:\Users\Default" has "C:" as root name and "\" +/// as root directory. +/// +/// Hence "C:" on Windows is absolute under GNU rules and not absolute under +/// C++17 because it has no root directory. Likewise "/" and "\" on Windows are +/// absolute under GNU and are not absolute under C++17 due to empty root name. +/// +/// \see has_root_name +/// \see has_root_directory +/// +/// @param path Input path. +/// @param style The style of \p path (e.g. Windows or POSIX). "native" style +/// means to derive the style from the host. +/// @result True if the path is absolute following GNU rules, false if it is +/// not. +bool is_absolute_gnu(const Twine &path, Style style = Style::native); + /// Is path relative? /// /// @param path Input path. |