C - Reading from stdin as characters are typed

Question

How do I fill an 80-character buffer with characters as they are being entered or until the carriage return key is pressed, or the buffer is full, whichever occurs first.

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Answer 1

If you really want the characters "as they are entered", you cannot use C io. You have to do it the unix way. (or windows way)

#include 
#include 
#include 
int main() {
  char r[81];
  int i;
  struct termios old,new;
  char c;
  tcgetattr(0,&old);
  new = old;
  new.c_lflag&=~ICANON;
  tcsetattr(0,TCSANOW,&new);
  i = 0;
  while (read(0,&c,1) && c!='\n' && i < 80) r[i++] = c;
  r[i] = 0;
  tcsetattr(0,TCSANOW,&old);
  printf("Entered <%s>\n",r);
  return 0;
}