Determine iPhone, iPod touch and iPad model generations

gistfile1.m

#include <sys/sysctl.h>

/*
  Return device model name.  
  Possible values:
  "iPhone1,1"  = iPhone 1G
  "iPhone1,2"  = iPhone 3G
  "iPhone2,1"  = iPhone 3GS
  "iPhone3,1"  = iPhone 4
  "iPhone3,3"  = iPhone 4 (CDMA)
  "iPhone4,1"  = iPhone 4S
  "iPhone5,1"  = iPhone 5
 
  "iPod1,1"    = iPod touch 1G
  "iPod2,1"    = iPod touch 2G
  "iPod3,1"    = iPod touch 3G
  "iPod4,1"    = iPod touch 4G
 
  "iPad1,1"    = iPod
  "iPad2,1"    = iPod 2 (WiFi)
  "iPad2,2"    = iPod 2 (GSM)
  "iPad2,3"    = iPod 2 (CDMAV)
  "iPad2,4"    = iPod 2 (CDMAS)
  "iPad3,1"    = iPod 3
  "iPad3,2"    = iPod 3 (GSM+CDMA)
  "iPad3,3"    = iPod 3 (GSM)
 
  "AppleTV2,1" = Apple TV (2G)
  "AppleTV3,1" = Apple TV (3G)

  "i386"       = Simulator
  "x86_64"     = Simulator
*/
- (NSString *)machineName
{
    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);
    char *tmpMachine = malloc(size);
    sysctlbyname("hw.machine", tmpMachine, &size, NULL, 0);
    NSString *machine = [NSString stringWithCString:tmpMachine encoding: NSUTF8StringEncoding];
    free(tmpMachine);
    return machine;
}
 
- (BOOL)isIphone4
{
    return [[self machineName] hasPrefix:@"iPhone3,"];
}