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