[pforth] / csrc / posix / pf_io_posix.c

/* $Id$ */
/***************************************************************
** I/O subsystem for PForth based on 'C'
**
** Author: Phil Burk
** Copyright 1994 3DO, Phil Burk, Larry Polansky, David Rosenboom
**
** The pForth software code is dedicated to the public domain,
** and any third party may reproduce, distribute and modify
** the pForth software code or any derivative works thereof
** without any compensation or license.  The pForth software
** code is provided on an "as is" basis without any warranty
** of any kind, including, without limitation, the implied
** warranties of merchantability and fitness for a particular
** purpose and their equivalents under the laws of any jurisdiction.
**
****************************************************************
** 941004 PLB Extracted IO calls from pforth_main.c
** 090220 PLB Fixed broken sdQueryTerminal on Mac. It always returned true.
***************************************************************/

#include "../pf_all.h"

/* Configure console so that characters are not buffered.
* This allows KEY and ?TERMINAL to work and also HISTORY.ON
*/

#include <unistd.h>
#include <sys/time.h>
#ifdef sun
#include <sys/int_types.h> /* Needed on Solaris for uint32_t in termio.h */
#endif
#include <termios.h>
#include <sys/poll.h>

static struct termios save_termios;
static int stdin_is_tty;

/* poll() is broken in Mac OS X Tiger OS so use select() instead. */
#ifndef PF_USE_SELECT
#define PF_USE_SELECT  (1)
#endif

/* Default portable terminal I/O. */
int  sdTerminalOut( char c )
{
   return putchar(c);
}

int  sdTerminalEcho( char c )
{
   putchar(c);
   return 0;
}

int  sdTerminalIn( void )
{
   return getchar();
}

int  sdTerminalFlush( void )
{
#ifdef PF_NO_FILEIO
   return -1;
#else
   return fflush(PF_STDOUT);
#endif
}

/****************************************************/
int sdQueryTerminal( void )
{
#if PF_USE_SELECT
   int select_retval;
   fd_set readfds;
   struct timeval tv;
   FD_ZERO(&readfds);
   FD_SET(STDIN_FILENO, &readfds);
   /* Set timeout to zero so that we just poll and return. */
   tv.tv_sec = 0;
   tv.tv_usec = 0;
   select_retval = select(STDIN_FILENO+1, &readfds, NULL, NULL, &tv);
   if (select_retval < 0)
   {
       perror("sdTerminalInit: select");
   }
   return FD_ISSET(STDIN_FILENO,&readfds) ? FTRUE : FFALSE;

#else
   int result;
   struct pollfd  pfd = { 0 };
   sdTerminalFlush();
   pfd.fd = STDIN_FILENO;
   pfd.events = POLLIN;
   result = poll( &pfd, 1, 0 );
   /* On a Mac it may set revents to POLLNVAL because poll() is broken on Tiger. */
   if( pfd.revents & POLLNVAL )
   {
       PRT(("sdQueryTerminal: poll got POLLNVAL, stdin not open\n"));
       return FFALSE;
   }
   else
   {
       return (pfd.revents & POLLIN) ? FTRUE : FFALSE;
   }
#endif
}

/****************************************************/
void sdTerminalInit(void)
{
   struct termios term;

   stdin_is_tty = isatty(STDIN_FILENO);
   if (stdin_is_tty)
   {
/* Get current terminal attributes and save them so we can restore them. */
       tcgetattr(STDIN_FILENO, &term);
       save_termios = term;

/* ICANON says to wait upon read until a character is received,
* and then to return it immediately (or soon enough....)
* ECHOCTL says not to echo backspaces and other control chars as ^H */
       term.c_lflag &= ~( ECHO | ECHONL | ECHOCTL | ICANON );
       term.c_cc[VTIME] = 0;
       term.c_cc[VMIN] = 1;
       if( tcsetattr(STDIN_FILENO, TCSANOW, &term) < 0 )
       {
           perror("sdTerminalInit: tcsetattr");
       }
   }
}

/****************************************************/
void sdTerminalTerm(void)
{
   if (stdin_is_tty)
   {
       tcsetattr(STDIN_FILENO, TCSANOW, &save_termios);
   }
}