From: Ted Kremenek <kremenek@apple.com>
Date: Sat, 21 Feb 2009 18:25:30 +0000 (+0000)
Subject: Add version of StringsEqualNoCase that takes two null-terminated C-strings and compar... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=07bf7efa0ac1f7ca8ca57a675dd8c6e2c52df73a;p=oota-llvm.git

Add version of StringsEqualNoCase that takes two null-terminated C-strings and compares up to 'len' characters.  I tend to screw up string comparison functions, so anyone who is interested please review this\!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65236 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/ADT/StringExtras.h b/include/llvm/ADT/StringExtras.h
index 75b54f5b78c..e40e409802d 100644
--- a/include/llvm/ADT/StringExtras.h
+++ b/include/llvm/ADT/StringExtras.h
@@ -159,6 +159,25 @@ static inline bool StringsEqualNoCase(const std::string &LHS,
   }
   return RHS[LHS.size()] == 0;  // Not too long?
 }
+  
+/// StringsEqualNoCase - Return true if the two null-terminated C strings are
+///  equal, ignoring
+
+static inline bool StringsEqualNoCase(const char *LHS, const char *RHS,
+                                      unsigned len) {
+
+  for (unsigned i = 0; i < len; ++i) {
+    if (tolower(LHS[i]) != tolower(RHS[i]))
+      return false;
+    
+    // If RHS[i] == 0 then LHS[i] == 0 or otherwise we would have returned
+    // at the previous branch as tolower('\0') == '\0'.
+    if (RHS[i] == 0)
+      return true;
+  }
+  
+  return true;
+}
 
 /// CStrInCStrNoCase - Portable version of strcasestr.  Locates the first
 ///  occurance of c-string 's2' in string 's1', ignoring case.  Returns