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language: Objective-C
licence: Other

ROT13

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// The magic and power of ROT13 encryption, now available via Cocoa!!!
@interface NSString (NSString_Additions)
-(NSString *) rot13String;
@end

@implementation NSString (NSString_Additions)
-(NSString *) rot13String
{
	const char *_string = [self cStringUsingEncoding:NSASCIIStringEncoding];
	int stringLength = [self length];
	char newString[stringLength+1];
	
	int x;
	for( x=0; x<stringLength; x++ )
	{
		unsigned int aCharacter = _string[x];
		
		if( 0x40 < aCharacter && aCharacter < 0x5B ) // A - Z
			newString[x] = (((aCharacter - 0x41) + 0x0D) % 0x1A) + 0x41;
		else if( 0x60 < aCharacter && aCharacter < 0x7B ) // a-z
			newString[x] = (((aCharacter - 0x61) + 0x0D) % 0x1A) + 0x61;
		else  // Not an alpha character
			newString[x] = aCharacter;
	}
	
	newString[x] = '\0';
	
	NSString *rotString = [NSString stringWithCString:newString encoding:NSASCIIStringEncoding];
	return( rotString );
}
@end