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/*
* stdinr.cc -- raw access to the keyboard
*
* Copyright (C) 1999-2004 Pawel Jalocha, SP9VRC
*
* This file is part of MT63.
*
* MT63 is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MT63 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MT63; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifdef __MSDOS__
#include <conio.h>
#include "stdinr.h"
int StdinSetRaw(void) { return 0; }
int StdinRead(void) { return kbhit() ? getch() : 0; }
int StdinReady(void) { return kbhit(); }
int StdinRestore(void) { return 0; }
#else
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#include <sys/time.h>
#include <sys/types.h>
#include "stdinr.h"
struct termios StdinOrigState; /* saved state of standard input */
/* set the standard input in "raw" mode so we can read char by char */
int StdinSetRaw(void)
{ int err; struct termios StdinState;
err=isatty(STDIN_FILENO);
if(err==0) { printf("STDIN is not a terminal ?\n"); return -1; }
err=fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK);
if(err) { printf("Can't set the NONBLOCK option on STDIN\n"); return -1; }
err=tcgetattr(STDIN_FILENO,&StdinOrigState);
if(err) { printf("tcgetattr() returns %d on STDIN\n",err); return -1; }
err=tcgetattr(STDIN_FILENO,&StdinState); if(err) return -1;
if(err) { printf("tcgetattr() returns %d on STDIN\n",err); return -1; }
StdinState.c_lflag &= ~(ICANON|ECHO);
StdinState.c_cc[VMIN] = 1;
StdinState.c_cc[VTIME] = 0;
/* cfmakeraw(&StdinState); */
err=tcsetattr(STDIN_FILENO,TCSANOW,&StdinState);
if(err) { printf("tcsetattr() returns %d on STDIN\n",err); return -1; }
return 0;
} /* OK => return 0; problems => return -1; */
/* check if STDIN ir ready for read - does NOT need to call StdinSetRaw() ! */
int StdinReady(void)
{ fd_set InpSet;
struct timeval Timeout;
FD_ZERO(&InpSet); FD_SET(STDIN_FILENO,&InpSet);
Timeout.tv_sec=0; Timeout.tv_usec=0;
if(select(STDIN_FILENO+1,&InpSet,NULL,NULL,&Timeout)<0) return -1;
return FD_ISSET(STDIN_FILENO,&InpSet);
} /* STDIN has got something => 1, nothing to read from STDIN => 0,
problems => -1 */
/* read a character from standard input, returns zero if input is empty */
int StdinRead(void)
{ int err; char key;
err=read(STDIN_FILENO,&key,1);
if(err<0) { return errno==EAGAIN ? 0 : -1; }
if(err==0) return 0;
return (int)key;
} /* empty => return 0; key pressed => return key; problems => return -1; */
/* restore standard input to state as before StdinSetRaw() */
int StdinRestore(void)
{ int err=tcsetattr(STDIN_FILENO,TCSANOW,&StdinOrigState);
if(err) { printf("tcsetattr() returns %d on STDIN\n",err); return -1; }
return 0; }
#endif
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