BString: Add IStartsWith() and IEndsWith() methods

Case-insensitive version of StartsWith() and EndsWith()

headers/os/support/String.h

@@ -243,10 +243,18 @@ public:
 			bool			StartsWith(const char* string) const;
 			bool			StartsWith(const char* string, int32 length) const;
 
+			bool			IStartsWith(const BString& string) const;
+			bool			IStartsWith(const char* string) const;
+			bool			IStartsWith(const char* string, int32 length) const;
+
 			bool			EndsWith(const BString& string) const;
 			bool			EndsWith(const char* string) const;
 			bool			EndsWith(const char* string, int32 length) const;
 
+			bool			IEndsWith(const BString& string) const;
+			bool			IEndsWith(const char* string) const;
+			bool			IEndsWith(const char* string, int32 length) const;
+
 			// Replacing
 			BString&		ReplaceFirst(char replaceThis, char withThis);
 			BString&		ReplaceLast(char replaceThis, char withThis);

src/kits/support/String.cpp

@@ -1412,6 +1412,30 @@ BString::StartsWith(const char* string, int32 length) const
 }
 
 
+bool
+BString::IStartsWith(const BString& string) const
+{
+	return IStartsWith(string.String(), string.Length());
+}
+
+
+bool
+BString::IStartsWith(const char* string) const
+{
+	return IStartsWith(string, strlen(string));
+}
+
+
+bool
+BString::IStartsWith(const char* string, int32 length) const
+{
+	if (length > Length() || length > (int32)strlen(string))
+		return false;
+
+	return _IFindAfter(string, 0, length) == 0;
+}
+
+
 bool
 BString::EndsWith(const BString& string) const
 {
@@ -1437,6 +1461,31 @@ BString::EndsWith(const char* string, int32 length) const
 }
 
 
+bool
+BString::IEndsWith(const BString& string) const
+{
+	return IEndsWith(string.String(), string.Length());
+}
+
+
+bool
+BString::IEndsWith(const char* string) const
+{
+	return IEndsWith(string, strlen(string));
+}
+
+
+bool
+BString::IEndsWith(const char* string, int32 length) const
+{
+	int32 offset = Length() - length;
+	if (offset < 0)
+		return false;
+
+	return _IFindBefore(string, Length(), length) == offset;
+}
+
+
 //	#pragma mark - Replacing