support: add a utility function to normalise path separators

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

2 files changed, 18 insertions, 0 deletions

diff --git a/lib/Support/Unix/Path.inc b/lib/Support/Unix/Path.inc
index 2b29baca73..500b7fecb7 100644
--- a/lib/Support/Unix/Path.inc
+++ b/lib/Support/Unix/Path.inc
@@ -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) {
diff --git a/lib/Support/Windows/Path.inc b/lib/Support/Windows/Path.inc
index a555f3e794..e59888e385 100644
--- a/lib/Support/Windows/Path.inc
+++ b/lib/Support/Windows/Path.inc
@@ -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.