Add compare_lower and equals_lower methods to StringRef. Switch all users of
StringsEqualNoCase (from StringExtras.h) to it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@87020 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/StringRef.cpp b/lib/Support/StringRef.cpp
index 6905edf..51e1100 100644
--- a/lib/Support/StringRef.cpp
+++ b/lib/Support/StringRef.cpp
@@ -15,6 +15,26 @@
const size_t StringRef::npos;
#endif
+static char ascii_tolower(char x) {
+ if (x >= 'A' && x <= 'Z')
+ return x - 'A' + 'a';
+ return x;
+}
+
+/// compare_lower - Compare strings, ignoring case.
+int StringRef::compare_lower(StringRef RHS) const {
+ for (size_t I = 0, E = std::min(Length, RHS.Length); I != E; ++I) {
+ char LHC = ascii_tolower(Data[I]);
+ char RHC = ascii_tolower(RHS.Data[I]);
+ if (LHC != RHC)
+ return LHC < RHC ? -1 : 1;
+ }
+
+ if (Length == RHS.Length)
+ return 0;
+ return Length < RHS.Length ? -1 : 1;
+}
+
//===----------------------------------------------------------------------===//
// String Searching
//===----------------------------------------------------------------------===//