析取pageup pagedown end home 的值 如果用于翻页 绝对好东西

#include <stdio.h>
#include<stdlib.h>
#include <termios.h>
#include <unistd.h>
int getch()
{ /*无回显接收一个字符*/
    struct termios t1,t2;
    int fd = STDIN_FILENO ,a;
    if(tcgetattr(fd,&t1) < 0)
    return -1;
    t2 = t1;
    cfmakeraw (&t1);
    if(tcsetattr(fd,TCSANOW,&t1) < 0)
    return -1;
    a = fgetc(stdin);
    if(tcsetattr(fd,TCSANOW,&t2) < 0)
    return -1;
    return a;
}
int main()
{
    char ch;
     ch = getch();
     
 printf("ch = %c, %d\n",ch,ch);
 ch = getch();
 
 printf("ch = %c, %d\n",ch,ch);
 ch = getch();
 if(ch == 49)
  printf("home\n");
  if(ch==52)
         printf("end\n");   
         if(ch ==54)
     printf("pagedown\n");
     if(ch ==53)
     printf("pageup\n");
 printf("ch = %c, %d\n",ch,ch);
  ch = getch();  
 printf("ch = %c, %d\n",ch,ch);
 
 return 0;

   
}