[Objective-C] どう書く？org IPv4アドレスのマスクの変換 をやってみた．

どう書く？org IPv4アドレスのマスクの変換 をObjective-C でやってみました．
コードを公開しますけど，いじめないでくださいね．

#import <Foundation/Foundation.h>

int main(void){
 
 int prefixNumber = 0;
 int i,j,temp;

 NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

 NSString *addressString = [NSString string];

 //NSString *subnetString = @"255.255.255.0";
 NSString *subnetString = @"255.255.255.240";
 //NSString *subnetString = @"128.0.0.0";
 //NSString *subnetString = @"255.248.0.0";

 NSArray *subnetStringItems = [subnetString componentsSeparatedByString:@"."];
 
 for(i = 0; i < 4; i++){
  temp = [[subnetStringItems objectAtIndex:i] intValue];
  for(j=0;j<8;j++){
   prefixNumber += (temp & 1);
   temp >>= 1;
  }
 }
 NSLog(@"prefixNumber=%d",prefixNumber);
 
 for(i = 0; i < 4; i++){
  if(prefixNumber >= 8){
   addressString = [addressString stringByAppendingString: @"255"]; 
   prefixNumber = prefixNumber - 8;
  }else if(prefixNumber > 0){
   temp = 0;
   temp = 255 - ((1 << (8-prefixNumber)) - 1);
   addressString = [addressString stringByAppendingString: [ NSString stringWithFormat : @"%d", temp ]]; 
   prefixNumber = 0;
  }else{
   addressString = [addressString stringByAppendingString: @"0"]; 
  } 

  if(i<3){
   addressString = [addressString stringByAppendingString: @"."]; 
  }

 }
 NSLog(@"addressString=%@",addressString);

 [pool drain];

 return 0;
}

どう書く？org IPv4アドレスのマスクの変換
http://ja.doukaku.org/253/nested/