Add CXString.cpp and CXString.h

llvm-svn: 119322

1 files changed, 67 insertions, 0 deletions

diff --git a/clang/tools/libclang/CXString.cpp b/clang/tools/libclang/CXString.cpp
new file mode 100644
index 00000000000..341b72032df
--- /dev/null
+++ b/clang/tools/libclang/CXString.cpp
@@ -0,0 +1,67 @@
+//===- CXString.cpp - Routines for manipulating CXStrings -----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines routines for manipulating CXStrings. It should be the
+// only file that has internal knowledge of the encoding of the data in
+// CXStrings.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CXString.h"
+#include "clang/Frontend/ASTUnit.h"
+#include "clang-c/Index.h"
+#include "llvm/Support/ErrorHandling.h"
+
+using namespace clang;
+using namespace clang::cxstring;
+
+enum CXStringFlag { CXS_Unmanaged, CXS_Malloc };
+
+CXString cxstring::createCXString(const char *String, bool DupString){
+  CXString Str;
+  if (DupString) {
+    Str.Spelling = strdup(String);
+    Str.private_flags = (unsigned) CXS_Malloc;
+  } else {
+    Str.Spelling = String;
+    Str.private_flags = (unsigned) CXS_Unmanaged;
+  }
+  return Str;
+}
+
+CXString cxstring::createCXString(llvm::StringRef String, bool DupString) {
+  CXString Result;
+  if (DupString || (!String.empty() && String.data()[String.size()] != 0)) {
+    char *Spelling = (char *)malloc(String.size() + 1);
+    memmove(Spelling, String.data(), String.size());
+    Spelling[String.size()] = 0;
+    Result.Spelling = Spelling;
+    Result.private_flags = (unsigned) CXS_Malloc;
+  } else {
+    Result.Spelling = String.data();
+    Result.private_flags = (unsigned) CXS_Unmanaged;
+  }
+  return Result;
+}
+
+//===----------------------------------------------------------------------===//
+// libClang public APIs.
+//===----------------------------------------------------------------------===//
+
+extern "C" {
+const char *clang_getCString(CXString string) {
+  return string.Spelling;
+}
+
+void clang_disposeString(CXString string) {
+  if (string.private_flags == CXS_Malloc && string.Spelling)
+    free((void*)string.Spelling);
+}
+} // end: extern "C"
+