[llvm-commits] [llvm] r65236 - /llvm/trunk/include/llvm/ADT/StringExtras.h

[Ted Kremenek]

Author: kremenek
Date: Sat Feb 21 12:25:30 2009
New Revision: 65236

URL: http://llvm.org/viewvc/llvm-project?rev=65236&view=rev
Log:
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\!

Modified:
    llvm/trunk/include/llvm/ADT/StringExtras.h

Modified: llvm/trunk/include/llvm/ADT/StringExtras.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/ADT/StringExtras.h?rev=65236&r1=65235&r2=65236&view=diff

==============================================================================
--- llvm/trunk/include/llvm/ADT/StringExtras.h (original)
+++ llvm/trunk/include/llvm/ADT/StringExtras.h Sat Feb 21 12:25:30 2009
@@ -159,6 +159,25 @@
   }
   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