Determine the iOS device model

The judging code is as follows:

-(NSString *) getmachine
{
size_t size;

Implicitly declared function Sysctlbyname is not valid in C99
int NR;
= Sysctlbyname ("Hw.machine", NULL, &size, NULL,
0);
Char *machine = (char *) malloc (size);

NR = Sysctlbyname ("Hw.machine", Machine, &size, NULL, 0);

NSString *platform = [NSString stringwithcstring:machine encoding:nsasciistringencoding];

Free (machine);

if ([Platform isequaltostring:@ "iphone1,1"]) return @ "IPhone 2G (A1203)";
if ([Platform isequaltostring:@ "iphone1,2"]) return @ "IPhone 3G (a1241/a1324)";
if ([Platform isequaltostring:@ "iphone2,1"]) return @ "IPhone 3GS (a1303/a1325)";
if ([Platform isequaltostring:@ "iphone3,1"]) return @ "IPhone 4 (A1332)";
if ([Platform isequaltostring:@ "iphone3,2"]) return @ "IPhone 4 (A1332)";
if ([Platform isequaltostring:@ "iphone3,3"]) return @ "IPhone 4 (A1349)";
if ([Platform isequaltostring:@ "iphone4,1"]) return @ "IPhone 4S (a1387/a1431)";
if ([Platform isequaltostring:@ "iphone5,1"]) return @ "IPhone 5 (A1428)";
if ([Platform isequaltostring:@ "iphone5,2"]) return @ "IPhone 5 (a1429/a1442)";
if ([Platform isequaltostring:@ "iphone5,3"]) return @ "IPhone 5c (a1456/a1532)";
if ([Platform isequaltostring:@ "iphone5,4"]) return @ "IPhone 5c (a1507/a1516/a1526/a1529)";
if ([Platform isequaltostring:@ "iphone6,1"]) return @ "IPhone 5s (a1453/a1533)";
if ([Platform isequaltostring:@ "iphone6,2"]) return @ "IPhone 5s (a1457/a1518/a1528/a1530)";
if ([Platform isequaltostring:@ "iphone7,1"]) return @ "IPhone 6 Plus (a1522/a1524)";
if ([Platform isequaltostring:@ "iphone7,2"]) return @ "IPhone 6 (a1549/a1586)";

if ([Platform isequaltostring:@ "ipod1,1"]) return @ "IPod Touch 1G (A1213)";
if ([Platform isequaltostring:@ "ipod2,1"]) return @ "IPod Touch 2G (A1288)";
if ([Platform isequaltostring:@ "ipod3,1"]) return @ "IPod Touch 3G (A1318)";
if ([Platform isequaltostring:@ "ipod4,1"]) return @ "IPod Touch 4G (A1367)";
if ([Platform isequaltostring:@ "ipod5,1"]) return @ "IPod Touch 5G (a1421/a1509)";

if ([Platform isequaltostring:@ "ipad1,1"]) return @ "IPad 1G (a1219/a1337)";

if ([Platform isequaltostring:@ "ipad2,1"]) return @ "IPad 2 (A1395)";
if ([Platform isequaltostring:@ "ipad2,2"]) return @ "IPad 2 (A1396)";
if ([Platform isequaltostring:@ "ipad2,3"]) return @ "IPad 2 (A1397)";
if ([Platform isequaltostring:@ "ipad2,4"]) return @ "IPad 2 (a1395+new Chip)";
if ([Platform isequaltostring:@ "ipad2,5"]) return @ "IPad Mini 1G (A1432)";
if ([Platform isequaltostring:@ "ipad2,6"]) return @ "IPad Mini 1G (A1454)";
if ([Platform isequaltostring:@ "ipad2,7"]) return @ "IPad Mini 1G (A1455)";

if ([Platform isequaltostring:@ "ipad3,1"]) return @ "IPad 3 (A1416)";
if ([Platform isequaltostring:@ "ipad3,2"]) return @ "IPad 3 (A1403)";
if ([Platform isequaltostring:@ "ipad3,3"]) return @ "IPad 3 (A1430)";
if ([Platform isequaltostring:@ "ipad3,4"]) return @ "IPad 4 (A1458)";
if ([Platform isequaltostring:@ "ipad3,5"]) return @ "IPad 4 (A1459)";
if ([Platform isequaltostring:@ "ipad3,6"]) return @ "IPad 4 (A1460)";

if ([Platform isequaltostring:@ "ipad4,1"]) return @ "IPad Air (A1474)";
if ([Platform isequaltostring:@ "ipad4,2"]) return @ "IPad Air (A1475)";
if ([Platform isequaltostring:@ "ipad4,3"]) return @ "IPad Air (A1476)";
if ([Platform isequaltostring:@ "ipad4,4"]) return @ "IPad Mini 2G (A1489)";
if ([Platform isequaltostring:@ "ipad4,5"]) return @ "IPad Mini 2G (A1490)";
if ([Platform isequaltostring:@ "ipad4,6"]) return @ "IPad Mini 2G (A1491)";

if ([Platform isequaltostring:@ "i386"]) return @ "IPhone Simulator";
if ([Platform isequaltostring:@ "x86_64"]) return @ "IPhone Simulator";
return platform;
}

where NR = Sysctlbyname ("Hw.machine", Machine, &size, NULL, 0); This function is not valid in C99, judging whether the current compiler is C99 standard, do the following:

 #include <stdio.h>  
 int Main ()  
  #if (!defined (__ stdc__))  
  printf ("non-standard C! "); 
  #elif defined (__stdc_version__)  
  printf ("Standard C version:%ld. ", __stdc_version__);  
  #else  
  printf (" old standard C. "); 
  #endif  
  GetChar ();  
  return 0;  
   
  predefined macro __stdc__ represents standard C. __STDC_VERSION__ represents the standard C version. The C99 corresponds to 199901L.  
  
  

struct Utsname systemInfo;
Uname (&systeminfo);
NSString *devicestring = [NSString stringWithCString:systemInfo.machine encoding:nsutf8stringencoding];
NSLog (@ "%@", devicestring);

This function can also achieve the effect,

Determine the iOS device model