/* termios.c - fake termios interface using sgtty interface
* by Magnus Doell and Bruce Evans.
*
*/
#include "sh.h"
#if defined(_MINIX) && !defined(_MINIX_VMD)
/* Undefine everything that clashes with sgtty.h. */
#undef B0
#undef B50
#undef B75
#undef B110
#undef B134
#undef B150
#undef B200
#undef B300
#undef B600
#undef B1200
#undef B1800
#undef B2400
#undef B4800
#undef B9600
#undef B19200
#undef B28800
#undef B38400
#undef B57600
#undef B115200
/* Do not #undef CRMOD. We want a warning when they differ! */
#undef ECHO
/* Do not #undef XTABS. We want a warning when they differ! */
/* Redefine some of the termios.h names just undefined with 'T_' prefixed
* to the name. Don't bother with the low speeds - Minix does not support
* them. Add support for higher speeds (speeds are now easy and don't need
* defines because they are not encoded).
*/
#define T_ECHO 000001
#include <errno.h>
#include <sgtty.h>
static _PROTOTYPE( int tc_to_sg_speed, (speed_t speed) );
static _PROTOTYPE( speed_t sg_to_tc_speed, (int speed) );
#define B19200 192
/* The speed get/set functions could be macros in the Minix implementation
* because there are speed fields in the structure with no fancy packing
* and it is not practical to check the values outside the driver.
* Where tests are necessary because the driver acts different from what
* POSIX requires, they are done in tcsetattr.
*/
speed_t cfgetispeed(termios_p)
struct termios *termios_p;
{
return termios_p->c_ispeed;
}
speed_t cfgetospeed(termios_p)
struct termios *termios_p;
{
return termios_p->c_ospeed;
}
speed_t cfsetispeed(termios_p, speed)
struct termios *termios_p;
speed_t speed;
{
termios_p->c_ispeed = speed;
return 0;
}
speed_t cfsetospeed(termios_p, speed)
struct termios *termios_p;
speed_t speed;
{
termios_p->c_ospeed = speed;
return 0;
}
static speed_t sg_to_tc_speed(speed)
int speed;
{
/* The speed encodings in sgtty.h and termios.h are different. Both are
* inflexible. Minix doesn't really support B0 but we map it through
* anyway. It doesn't support B50, B75 or B134.
*/
switch (speed) {
case B0: return 0;
case B110: return 110;
case B200: return 200;
case B300: return 300;
case B600: return 600;
case B1200: return 1200;
case B1800: return 1800;
case B2400: return 2400;
case B4800: return 4800;
case B9600: return 9600;
case B19200: return 19200;
#ifdef B28800
case B28800: return 28800;
#endif
#ifdef B38400
case B38400: return 38400;
#endif
#ifdef B57600
case B57600: return 57600;
#endif
#ifdef B115200
case B115200: return 115200;
#endif
default: return (speed_t)-1;
}
}
static int tc_to_sg_speed(speed)
speed_t speed;
{
/* Don't use a switch here in case the compiler is 16-bit and doesn't
* properly support longs (speed_t's) in switches. It turns out the
* switch is larger and slower for most compilers anyway!
*/
if (speed == 0) return 0;
if (speed == 110) return B110;
if (speed == 200) return B200;
if (speed == 300) return B300;
if (speed == 600) return B600;
if (speed == 1200) return B1200;
if (speed == 1800) return B1800;
if (speed == 2400) return B2400;
if (speed == 4800) return B4800;
if (speed == 9600) return B9600;
if (speed == 19200) return B19200;
#ifdef B28800
if (speed == 28800) return B28800;
#endif
#ifdef B38400
if (speed == 38400) return B38400;
#endif
#ifdef B57600
if (speed == 57600) return B57600;
#endif
#ifdef B115200
if (speed == 115200) return B115200;
#endif
return -1;
}
int tcgetattr(filedes, termios_p)
int filedes;
struct termios *termios_p;
{
struct sgttyb sgbuf;
struct tchars tcbuf;
if (ioctl(filedes, TIOCGETP, &sgbuf) < 0
|| ioctl(filedes, TIOCGETC, (struct sgttyb *) &tcbuf) < 0)
{
return -1;
}
/* Minix input flags:
* BRKINT: forced off (break is not recognized)
* IGNBRK: forced on (break is not recognized)
* ICRNL: set if CRMOD is set and not RAW (CRMOD also controls output)
* IGNCR: forced off (ignoring cr's is not supported)
* INLCR: forced off (mapping nl's to cr's is not supported)
* ISTRIP: forced off (should be off for consoles, on for rs232 no RAW)
* IXOFF: forced off (rs232 uses CTS instead of XON/XOFF)
* IXON: forced on if not RAW
* PARMRK: forced off (no '\377', '\0', X sequence on errors)
* ? IGNPAR: forced off (input with parity/framing errors is kept)
* ? INPCK: forced off (input parity checking is not supported)
*/
termios_p->c_iflag = IGNBRK;
if (!(sgbuf.sg_flags & RAW))
{
termios_p->c_iflag |= IXON;
if (sgbuf.sg_flags & CRMOD)
{
termios_p->c_iflag |= ICRNL;
}
}
/* Minix output flags:
* OPOST: set if CRMOD or XTABS is set
* XTABS: copied from sg_flags
* CRMOD: copied from sg_flags
*/
termios_p->c_oflag = sgbuf.sg_flags & (CRMOD | XTABS);
if (termios_p->c_oflag)
{
termios_p->c_oflag |= OPOST;
}
/* Minix local flags:
* ECHO: set if ECHO is set
* ECHOE: set if ECHO is set (ERASE echoed as error-corecting backspace)
* ECHOK: set if ECHO is set ('\n' echoed after KILL char)
* ECHONL: forced off ('\n' not echoed when ECHO isn't set)
* ICANON: set if neither CBREAK nor RAW
* IEXTEN: forced off
* ISIG: set if not RAW
* NOFLSH: forced off (input/output queues are always flushed)
* TOSTOP: forced off (no job control)
*/
termios_p->c_lflag = 0;
if (sgbuf.sg_flags & ECHO)
{
termios_p->c_lflag |= T_ECHO | ECHOE | ECHOK;
}
if (!(sgbuf.sg_flags & RAW))
{
termios_p->c_lflag |= ISIG;
if (!(sgbuf.sg_flags & CBREAK))
{
termios_p->c_lflag |= ICANON;
}
}
/* Minix control flags:
* CLOCAL: forced on (ignore modem status lines - not quite right)
* CREAD: forced on (receiver is always enabled)
* CSIZE: CS5-CS8 correspond directly to BITS5-BITS8
* CSTOPB: set for B110 (driver will generate 2 stop-bits than)
* HUPCL: forced off
* PARENB: set if EVENP or ODDP is set
* PARODD: set if ODDP is set
*/
termios_p->c_cflag = CLOCAL | CREAD;
switch (sgbuf.sg_flags & BITS8)
{
case BITS5: termios_p->c_cflag |= CS5; break;
case BITS6: termios_p->c_cflag |= CS6; break;
case BITS7: termios_p->c_cflag |= CS7; break;
case BITS8: termios_p->c_cflag |= CS8; break;
}
if (sgbuf.sg_flags & ODDP)
{
termios_p->c_cflag |= PARENB | PARODD;
}
if (sgbuf.sg_flags & EVENP)
{
termios_p->c_cflag |= PARENB;
}
if (sgbuf.sg_ispeed == B110)
{
termios_p->c_cflag |= CSTOPB;
}
/* Minix may give back different input and output baudrates,
* but only the input baudrate is valid for both.
* As our termios emulation will fail, if input baudrate differs
* from output baudrate, force them to be equal.
* Otherwise it would be very suprisingly not to be able to set
* the terminal back to the state returned by tcgetattr :).
*/
termios_p->c_ospeed =
termios_p->c_ispeed =
sg_to_tc_speed((unsigned char) sgbuf.sg_ispeed);
/* Minix control characters correspond directly except VSUSP and the
* important VMIN and VTIME are not really supported.
*/
termios_p->c_cc[VEOF] = tcbuf.t_eofc;
termios_p->c_cc[VEOL] = tcbuf.t_brkc;
termios_p->c_cc[VERASE] = sgbuf.sg_erase;
termios_p->c_cc[VINTR] = tcbuf.t_intrc;
termios_p->c_cc[VKILL] = sgbuf.sg_kill;
termios_p->c_cc[VQUIT] = tcbuf.t_quitc;
termios_p->c_cc[VSTART] = tcbuf.t_startc;
termios_p->c_cc[VSTOP] = tcbuf.t_stopc;
termios_p->c_cc[VMIN] = 1;
termios_p->c_cc[VTIME] = 0;
termios_p->c_cc[VSUSP] = 0;
return 0;
}
int tcsetattr(filedes, opt_actions, termios_p)
int filedes;
int opt_actions;
struct termios *termios_p;
{
struct sgttyb sgbuf;
struct tchars tcbuf;
int sgspeed;
/* Posix 1003.1-1988 page 135 says:
* Attempts to set unsupported baud rates shall be ignored, and it is
* implementation-defined whether an error is returned by any or all of
* cfsetispeed(), cfsetospeed(), or tcsetattr(). This refers both to
* changes to baud rates not supported by the hardware, and to changes
* setting the input and output baud rates to different values if the
* hardware does not support it.
* Ignoring means not to change the existing settings, doesn't it?
*/
if ((termios_p->c_ispeed != 0 && termios_p->c_ispeed != termios_p->c_ospeed)
|| (sgspeed = tc_to_sg_speed(termios_p->c_ospeed)) < 0)
{
errno = EINVAL;
return -1;
}
sgbuf.sg_ispeed = sgbuf.sg_ospeed = sgspeed;
sgbuf.sg_flags = 0;
/* I don't know what should happen with requests that are not supported by
* old Minix drivers and therefore cannot be emulated.
* Returning an error may confuse the application (the values aren't really
* invalid or unsupported by the hardware, they just couldn't be satisfied
* by the driver). Not returning an error might be even worse because the
* driver will act different to what the application requires it to act
* after sucessfully setting the attributes as specified.
* Settings that cannot be emulated fully include:
* c_ospeed != 110 && c_cflag & CSTOPB
* c_ospeed == 110 && ! c_cflag & CSTOPB
* (c_cc[VMIN] != 1 || c_cc[VTIME] != 0) && ! c_lflag & ICANON
* c_lflag & ICANON && ! c_lflag & ISIG
* For the moment I just ignore these conflicts.
*/
if (termios_p->c_oflag & OPOST)
{
/* CRMOD isn't Posix and may conflict with ICRNL, which is Posix,
* so we just ignore it.
*/
if (termios_p->c_oflag & XTABS)
{
sgbuf.sg_flags |= XTABS;
}
}
if (termios_p->c_iflag & ICRNL)
{
/* We couldn't do it better :-(. */
sgbuf.sg_flags |= CRMOD;
}
if (termios_p->c_lflag & T_ECHO)
{
sgbuf.sg_flags |= ECHO;
}
if (!(termios_p->c_lflag & ICANON))
{
if (termios_p->c_lflag & ISIG)
{
sgbuf.sg_flags |= CBREAK;
}
else
{
sgbuf.sg_flags |= RAW;
}
}
switch (termios_p->c_cflag & CSIZE)
{
case CS5: sgbuf.sg_flags |= BITS5; break;
case CS6: sgbuf.sg_flags |= BITS6; break;
case CS7: sgbuf.sg_flags |= BITS7; break;
case CS8: sgbuf.sg_flags |= BITS8; break;
}
if (termios_p->c_cflag & PARENB)
{
if (termios_p->c_cflag & PARODD)
{
sgbuf.sg_flags |= ODDP;
}
else
{
sgbuf.sg_flags |= EVENP;
}
}
sgbuf.sg_erase = termios_p->c_cc[VERASE];
sgbuf.sg_kill = termios_p->c_cc[VKILL];
tcbuf.t_intrc = termios_p->c_cc[VINTR];
tcbuf.t_quitc = termios_p->c_cc[VQUIT];
tcbuf.t_startc = termios_p->c_cc[VSTART];
tcbuf.t_stopc = termios_p->c_cc[VSTOP];
tcbuf.t_eofc = termios_p->c_cc[VEOF];
tcbuf.t_brkc = termios_p->c_cc[VEOL];
return ioctl(filedes, TIOCSETP, &sgbuf) < 0 &&
ioctl(filedes, TIOCSETC, (struct sgttyb *) &tcbuf) < 0 ?
-1 : 0;
}
#endif /* _MINIX && !_MINIX_VMD */