liuyenting
9/18/2016 - 7:15 AM

*nix alternative for _kbhit() subroutine. https://stackoverflow.com/questions/1449324/how-to-simulate-press-any-key-to-continue

*nix alternative for _kbhit() subroutine. https://stackoverflow.com/questions/1449324/how-to-simulate-press-any-key-to-continue

kbhit.c
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#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>

int kbhit(void) {
  struct termios oldt, newt;
  int ch;
  int oldf;
  
  tcgetattr(STDIN_FILENO, &oldt);
  newt = oldt;
  newt.c_lflag &= ~(ICANON | ECHO);
  tcsetattr(STDIN_FILENO, TCSANOW, &newt);
  oldf = fcntl(STDIN_FILENO, F_GETFL, 0);
  fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);
  
  ch = getchar();
  
  tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
  fcntl(STDIN_FILENO, F_SETFL, oldf);
  
  if (ch != EOF) {
    ungetc(ch, stdin);
    return 1;
  }
  
  return 0;
}