/* sys_keyin.c  This version works on _most_ Unix platforms 
  Fortran calls: 
      CALL SYS_KEYSET(1)   to set single-keystroke mode
      CALL SYS_KEYIN(KEY)  to get integer ASCII code for next key-stroke
                           e.g. 32 for space, 97 for "a" etc.
                           (Integer rather than character to cope with 
                           control characters etc.)
      CALL SYS_KEYSET(0)   to restore normal input mode
  Author:  Clive Page,  cgp@le.ac.uk, 1994-JUL-13
*/

#include <stdio.h>
#include <termios.h>
sys_keyset_(int *mode)
{
  static struct termios termattr,saveattr;
  static tcflag_t save_flags;
  
  if(*mode != 0) 
  {
    tcgetattr(0,&termattr);
    saveattr=termattr;
    termattr.c_lflag&=~(ICANON);
    termattr.c_lflag&=~(ECHO); 
    termattr.c_cc[VMIN] = 1;
    termattr.c_cc[VTIME] = 0;
    tcsetattr(0,TCSADRAIN,&termattr);
  }
  else
  {  
    tcsetattr(0,TCSADRAIN,&saveattr);
  }
  return;
}


sys_keyin_(int *nextch)
{
  *nextch = getchar();
  return;
}