Gets every method in the current objc runtime and orders them in a CSV by length

MethodsByLength.m

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

int main(int argc, char *argv[])
{
    int numberOfClasses = objc_getClassList(NULL, 0);
    Class *classes = NULL;
    classes = (__unsafe_unretained Class *)malloc(numberOfClasses * sizeof(Class));
    numberOfClasses = objc_getClassList(classes, numberOfClasses);
    NSMutableDictionary *methodsByLength = [NSMutableDictionary new];

    for (int i = 0; i < numberOfClasses; i++) {
        Class class = classes[i];
        unsigned int numberOfMethods = 0;
        Method *instanceMethods = class_copyMethodList(class, &numberOfMethods);

        for (int j = 0; j < numberOfMethods; j++) {
            Method method = instanceMethods[j];
            SEL selector = method_getName(method);
            NSString *methodName = NSStringFromSelector(selector);
            NSUInteger length = [methodName length];
            NSMutableArray *methods = methodsByLength[@(length)];
            if (methods == nil) {
                methods = [NSMutableArray new];
                methodsByLength[@(length)] = methods;
            }
            [methods addObject: methodName];
        }

        Class metaClass = objc_getMetaClass([NSStringFromClass(class) cStringUsingEncoding:NSASCIIStringEncoding]);
        Method *classMethods = class_copyMethodList(metaClass, &numberOfMethods);
        for (int j = 0; j < numberOfMethods; j++) {
            Method method = classMethods[j];
            SEL selector = method_getName(method);
            NSString *methodName = NSStringFromSelector(selector);
            NSUInteger length = [methodName length];
            NSMutableArray *methods = methodsByLength[@(length)];
            if (methods == nil) {
                methods = [NSMutableArray new];
                methodsByLength[@(length)] = methods;
            }
            [methods addObject: methodName];
        }
    }
    NSArray *keys = [[methodsByLength allKeys] sortedArrayUsingSelector: @selector(compare:)];
    NSMutableString *csv = [NSMutableString new];
    for (NSNumber *len in keys) {
        NSArray *methods = methodsByLength[len];
        [csv appendFormat: @"%@", len];
        for (NSString *methodName in methods) {
            [csv appendFormat: @",%@", methodName];
        }
        [csv appendString: @"\n"];
    }
    return 0;
}