diff options
Diffstat (limited to 'lib/Support/StringRef.cpp')
-rw-r--r-- | lib/Support/StringRef.cpp | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/lib/Support/StringRef.cpp b/lib/Support/StringRef.cpp index 6905edf19e..51e11004f3 100644 --- a/lib/Support/StringRef.cpp +++ b/lib/Support/StringRef.cpp @@ -15,6 +15,26 @@ using namespace llvm; 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 //===----------------------------------------------------------------------===// |