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support: add a utility function to normalise path separators

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Add a utility function to convert the Windows path separator to Unix style path
separators.  This is used by a subsequent change in clang to enable the use of
Windows SDK headers on Linux.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203611 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool 2014-03-11 22:05:42 +00:00
parent ff73a2bf86
commit 404a72729b
4 changed files with 63 additions and 0 deletions
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8
include/llvm/Support/FileSystem.h
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@ -269,6 +269,14 @@ private:
/// platform specific error_code.
error_code make_absolute(SmallVectorImpl<char> &path);
/// @brief Normalize path separators in \a Path
///
/// If the path contains any '\' separators, they are transformed into '/'.
/// This is particularly useful when cross-compiling Windows on Linux, but is
/// safe to invoke on Windows, which accepts both characters as a path
/// separator.
error_code normalize_separators(SmallVectorImpl<char> &Path);
/// @brief Create all the non-existent directories in path.
///
/// @param path Directories to create.

13
lib/Support/Unix/Path.inc
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@ -272,6 +272,19 @@ error_code create_directory(const Twine &path, bool IgnoreExisting) {
return error_code::success();
}
error_code normalize_separators(SmallVectorImpl<char> &Path) {
for (auto PI = Path.begin(), PE = Path.end(); PI < PE; ++PI) {
if (*PI == '\\') {
auto PN = PI + 1;
if (PN < PE && *PN == '\\')
++PI; // increment once, the for loop will move over the escaped slash
else
*PI = '/';
}
}
return error_code::success();
}
// Note that we are using symbolic link because hard links are not supported by
// all filesystems (SMB doesn't).
error_code create_link(const Twine &to, const Twine &from) {

5
lib/Support/Windows/Path.inc
View File

@ -158,6 +158,11 @@ error_code create_directory(const Twine &path, bool IgnoreExisting) {
return error_code::success();
}
error_code normalize_separators(SmallVectorImpl<char> &Path) {
(void) Path;
return error_code::success();
}
// We can't use symbolic links for windows.
error_code create_link(const Twine &to, const Twine &from) {
// Get arguments.

37
unittests/Support/Path.cpp
View File

@ -620,4 +620,41 @@ TEST_F(FileSystemTest, FileMapping) {
fs::mapped_file_region mfrrv(std::move(m));
EXPECT_EQ(mfrrv.const_data(), Data);
}
TEST(Support, NormalizePath) {
#if defined(LLVM_ON_WIN32)
#define EXPECT_PATH_IS(path__, windows__, not_windows__) \
EXPECT_EQ(path__, windows__);
#else
#define EXPECT_PATH_IS(path__, windows__, not_windows__) \
EXPECT_EQ(path__, not_windows__);
#endif
SmallString<64> Path1("a");
SmallString<64> Path2("a/b");
SmallString<64> Path3("a\\b");
SmallString<64> Path4("a\\\\b");
SmallString<64> Path5("\\a");
SmallString<64> Path6("a\\");
ASSERT_NO_ERROR(fs::normalize_separators(Path1));
EXPECT_PATH_IS(Path1, "a", "a");
ASSERT_NO_ERROR(fs::normalize_separators(Path2));
EXPECT_PATH_IS(Path2, "a/b", "a/b");
ASSERT_NO_ERROR(fs::normalize_separators(Path3));
EXPECT_PATH_IS(Path3, "a\\b", "a/b");
ASSERT_NO_ERROR(fs::normalize_separators(Path4));
EXPECT_PATH_IS(Path4, "a\\\\b", "a\\\\b");
ASSERT_NO_ERROR(fs::normalize_separators(Path5));
EXPECT_PATH_IS(Path5, "\\a", "/a");
ASSERT_NO_ERROR(fs::normalize_separators(Path6));
EXPECT_PATH_IS(Path6, "a\\", "a/");
#undef EXPECT_PATH_IS
}
} // anonymous namespace