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- #
- /*
- * general TTY subroutines
- */
- #include "../h/param.h"
- #include "../h/systm.h"
- #include "../h/dir.h"
- #include "../h/user.h"
- #include "../h/tty.h"
- #include "../h/proc.h"
- #include "../h/mx.h"
- #include "../h/inode.h"
- #include "../h/file.h"
- #include "../h/reg.h"
- #include "../h/conf.h"
-
- char partab[];
-
-
- /*
- * Input mapping table-- if an entry is non-zero, when the
- * corresponding character is typed preceded by "\" the escape
- * sequence is replaced by the table value. Mostly used for
- * upper-case only terminals.
- */
-
- char maptab[] ={
- 000,000,000,000,000,000,000,000,
- 000,000,000,000,000,000,000,000,
- 000,000,000,000,000,000,000,000,
- 000,000,000,000,000,000,000,000,
- 000,'|',000,000,000,000,000,'`',
- '{','}',000,000,000,000,000,000,
- 000,000,000,000,000,000,000,000,
- 000,000,000,000,000,000,000,000,
- 000,000,000,000,000,000,000,000,
- 000,000,000,000,000,000,000,000,
- 000,000,000,000,000,000,000,000,
- 000,000,000,000,000,000,'~',000,
- 000,'A','B','C','D','E','F','G',
- 'H','I','J','K','L','M','N','O',
- 'P','Q','R','S','T','U','V','W',
- 'X','Y','Z',000,000,000,000,000,
- };
-
-
- /*
- * shorthand
- */
- #define q1 tp->t_rawq
- #define q2 tp->t_canq
- #define q3 tp->t_outq
- #define q4 tp->t_un.t_ctlq
-
-
- /*
- * routine called on first teletype open.
- * establishes a process group for distribution
- * of quits and interrupts from the tty.
- */
- ttyopen(dev, tp)
- dev_t dev;
- register struct tty *tp;
- {
- register struct proc *pp;
-
- pp = u.u_procp;
- tp->t_dev = dev;
- if(pp->p_pgrp == 0) {
- u.u_ttyp = tp;
- u.u_ttyd = dev;
- if (tp->t_pgrp==0)
- tp->t_pgrp = pp->p_pid;
- pp->p_pgrp = tp->t_pgrp;
- }
- tp->t_state &= ~WOPEN;
- tp->t_state |= ISOPEN;
- }
-
-
- /*
- * set default control characters.
- */
- ttychars(tp)
- register struct tty *tp;
- {
- tun.t_intrc = CINTR;
- tun.t_quitc = CQUIT;
- tun.t_startc = CSTART;
- tun.t_stopc = CSTOP;
- tun.t_eofc = CEOT;
- tun.t_brkc = CBRK;
- tp->t_erase = CERASE;
- tp->t_kill = CKILL;
- }
-
- /*
- * clean tp on last close
- */
- ttyclose(tp)
- register struct tty *tp;
- {
-
- tp->t_pgrp = 0;
- wflushtty(tp);
- tp->t_state = 0;
- }
-
- /*
- * stty/gtty writearound
- */
- stty()
- {
- u.u_arg[2] = u.u_arg[1];
- u.u_arg[1] = TIOCSETP;
- ioctl();
- }
-
- gtty()
- {
- u.u_arg[2] = u.u_arg[1];
- u.u_arg[1] = TIOCGETP;
- ioctl();
- }
-
- /*
- * ioctl system call
- * Check legality, execute common code, and switch out to individual
- * device routine.
- */
- ioctl()
- {
- register struct file *fp;
- register struct inode *ip;
- register struct a {
- int fdes;
- int cmd;
- caddr_t cmarg;
- } *uap;
- register dev_t dev;
- register fmt;
-
- uap = (struct a *)u.u_ap;
- if ((fp = getf(uap->fdes)) == NULL)
- return;
- if (uap->cmd==FIOCLEX) {
- u.u_pofile[uap->fdes] |= EXCLOSE;
- return;
- }
- if (uap->cmd==FIONCLEX) {
- u.u_pofile[uap->fdes] &= ~EXCLOSE;
- return;
- }
- ip = fp->f_inode;
- fmt = ip->i_mode & IFMT;
- if (fmt != IFCHR && fmt != IFMPC) {
- u.u_error = ENOTTY;
- return;
- }
- dev = (dev_t)ip->i_un.i_rdev;
- (*cdevsw[major(dev)].d_ioctl)(dev, uap->cmd, uap->cmarg, fp->f_flag);
- }
-
- /*
- * Common code for several tty ioctl commands
- */
- ttioccomm(com, tp, addr, dev)
- register struct tty *tp;
- caddr_t addr;
- {
- unsigned t;
- struct ttiocb iocb;
- extern int nldisp;
-
- switch(com) {
-
- /*
- * get discipline number
- */
- case TIOCGETD:
- t = tp->t_line;
- if (copyout((caddr_t)&t, addr, sizeof(t)))
- u.u_error = EFAULT;
- break;
-
- /*
- * set line discipline
- */
- case TIOCSETD:
- if (copyin(addr, (caddr_t)&t, sizeof(t))) {
- u.u_error = EFAULT;
- break;
- }
- if (t >= nldisp) {
- u.u_error = ENXIO;
- break;
- }
- if (tp->t_line)
- (*linesw[tp->t_line].l_close)(tp);
- if (t)
- (*linesw[t].l_open)(dev, tp, addr);
- if (u.u_error==0)
- tp->t_line = t;
- break;
-
- /*
- * prevent more opens on channel
- */
- case TIOCEXCL:
- tp->t_state |= XCLUDE;
- break;
- case TIOCNXCL:
- tp->t_state &= ~XCLUDE;
- break;
-
- /*
- * Set new parameters
- */
- case TIOCSETP:
- wflushtty(tp);
- case TIOCSETN:
- if (copyin(addr, (caddr_t)&iocb, sizeof(iocb))) {
- u.u_error = EFAULT;
- return(1);
- }
- tp->t_ispeed = iocb.ioc_ispeed;
- tp->t_ospeed = iocb.ioc_ospeed;
- tp->t_erase = iocb.ioc_erase;
- tp->t_kill = iocb.ioc_kill;
- tp->t_flags = iocb.ioc_flags;
- break;
-
- /*
- * send current parameters to user
- */
- case TIOCGETP:
- iocb.ioc_ispeed = tp->t_ispeed;
- iocb.ioc_ospeed = tp->t_ospeed;
- iocb.ioc_erase = tp->t_erase;
- iocb.ioc_kill = tp->t_kill;
- iocb.ioc_flags = tp->t_flags;
- if (copyout((caddr_t)&iocb, addr, sizeof(iocb)))
- u.u_error = EFAULT;
- break;
-
- /*
- * Hang up line on last close
- */
-
- case TIOCHPCL:
- tp->t_state |= HUPCLS;
- break;
-
- case TIOCFLUSH:
- flushtty(tp);
- break;
-
- /*
- * ioctl entries to line discipline
- */
- case DIOCSETP:
- case DIOCGETP:
- (*linesw[tp->t_line].l_ioctl)(com, tp, addr);
- break;
-
- /*
- * set and fetch special characters
- */
- case TIOCSETC:
- if (copyin(addr, (caddr_t)&tun, sizeof(struct tc)))
- u.u_error = EFAULT;
- break;
-
- case TIOCGETC:
- if (copyout((caddr_t)&tun, addr, sizeof(struct tc)))
- u.u_error = EFAULT;
- break;
-
- default:
- return(0);
- }
- return(1);
- }
-
- /*
- * Wait for output to drain, then flush input waiting.
- */
- wflushtty(tp)
- register struct tty *tp;
- {
-
- spl5();
- while (tp->t_outq.c_cc && tp->t_state&CARR_ON) {
- (*tp->t_oproc)(tp);
- tp->t_state |= ASLEEP;
- sleep((caddr_t)&tp->t_outq, TTOPRI);
- }
- flushtty(tp);
- spl0();
- }
-
- /*
- * flush all TTY queues
- */
- flushtty(tp)
- register struct tty *tp;
- {
- register s;
-
- while (getc(&tp->t_canq) >= 0)
- ;
- wakeup((caddr_t)&tp->t_rawq);
- wakeup((caddr_t)&tp->t_outq);
- s = spl6();
- tp->t_state &= ~TTSTOP;
- (*cdevsw[major(tp->t_dev)].d_stop)(tp);
- while (getc(&tp->t_outq) >= 0)
- ;
- while (getc(&tp->t_rawq) >= 0)
- ;
- tp->t_delct = 0;
- splx(s);
- }
-
-
-
- /*
- * transfer raw input list to canonical list,
- * doing erase-kill processing and handling escapes.
- * It waits until a full line has been typed in cooked mode,
- * or until any character has been typed in raw mode.
- */
- canon(tp)
- register struct tty *tp;
- {
- register char *bp;
- char *bp1;
- register int c;
- int mc;
-
- spl5();
- while ((tp->t_flags&(RAW|CBREAK))==0 && tp->t_delct==0
- || (tp->t_flags&(RAW|CBREAK))!=0 && tp->t_rawq.c_cc==0) {
- if ((tp->t_state&CARR_ON)==0 || tp->t_chan!=NULL) {
- return(0);
- }
- sleep((caddr_t)&tp->t_rawq, TTIPRI);
- }
- spl0();
- loop:
- bp = &canonb[2];
- while ((c=getc(&tp->t_rawq)) >= 0) {
- if ((tp->t_flags&(RAW|CBREAK))==0) {
- if (c==0377) {
- tp->t_delct--;
- break;
- }
- if (bp[-1]!='\\') {
- if (c==tp->t_erase) {
- if (bp > &canonb[2])
- bp--;
- continue;
- }
- if (c==tp->t_kill)
- goto loop;
- if (c==tun.t_eofc)
- continue;
- } else {
- mc = maptab[c];
- if (c==tp->t_erase || c==tp->t_kill)
- mc = c;
- if (mc && (mc==c || (tp->t_flags&LCASE))) {
- if (bp[-2] != '\\')
- c = mc;
- bp--;
- }
- }
- }
- *bp++ = c;
- if (bp>=canonb+CANBSIZ)
- break;
- }
- bp1 = &canonb[2];
- b_to_q(bp1, bp-bp1, &tp->t_canq);
-
- if (tp->t_state&TBLOCK && tp->t_rawq.c_cc < TTYHOG/5) {
- if (putc(tun.t_startc, &tp->t_outq)==0) {
- tp->t_state &= ~TBLOCK;
- ttstart(tp);
- }
- tp->t_char = 0;
- }
-
- return(bp-bp1);
- }
-
-
- /*
- * block transfer input handler.
- */
- ttyrend(tp, pb, pe)
- register struct tty *tp;
- register char *pb, *pe;
- {
- int tandem;
-
- tandem = tp->t_flags&TANDEM;
- if (tp->t_flags&RAW) {
- b_to_q(pb, pe-pb, &tp->t_rawq);
- if (tp->t_chan)
- sdata(tp->t_chan); else
- wakeup((caddr_t)&tp->t_rawq);
- } else {
- tp->t_flags &= ~TANDEM;
- while (pb < pe)
- ttyinput(*pb++, tp);
- tp->t_flags |= tandem;
- }
- if (tandem)
- ttyblock(tp);
- }
-
- /*
- * Place a character on raw TTY input queue, putting in delimiters
- * and waking up top half as needed.
- * Also echo if required.
- * The arguments are the character and the appropriate
- * tty structure.
- */
- ttyinput(c, tp)
- register c;
- register struct tty *tp;
- {
- register int t_flags;
- register struct chan *cp;
-
- tk_nin += 1;
- c &= 0377;
- t_flags = tp->t_flags;
- if (t_flags&TANDEM)
- ttyblock(tp);
- if ((t_flags&RAW)==0) {
- c &= 0177;
- if (tp->t_state&TTSTOP) {
- if (c==tun.t_startc) {
- tp->t_state &= ~TTSTOP;
- ttstart(tp);
- return;
- }
- if (c==tun.t_stopc)
- return;
- tp->t_state &= ~TTSTOP;
- ttstart(tp);
- } else {
- if (c==tun.t_stopc) {
- tp->t_state |= TTSTOP;
- (*cdevsw[major(tp->t_dev)].d_stop)(tp);
- return;
- }
- if (c==tun.t_startc)
- return;
- }
- if (c==tun.t_quitc || c==tun.t_intrc) {
- flushtty(tp);
- c = (c==tun.t_intrc) ? SIGINT:SIGQUIT;
- if (tp->t_chan)
- scontrol(tp->t_chan, M_SIG, c);
- else
- signal(tp->t_pgrp, c);
- return;
- }
- if (c=='\r' && t_flags&CRMOD)
- c = '\n';
- }
- if (tp->t_rawq.c_cc>TTYHOG) {
- flushtty(tp);
- return;
- }
- if (t_flags&LCASE && c>='A' && c<='Z')
- c += 'a'-'A';
- putc(c, &tp->t_rawq);
- if (t_flags&(RAW|CBREAK)||(c=='\n'||c==tun.t_eofc||c==tun.t_brkc)) {
- if ((t_flags&(RAW|CBREAK))==0 && putc(0377, &tp->t_rawq)==0)
- tp->t_delct++;
- if ((cp=tp->t_chan)!=NULL)
- sdata(cp); else
- wakeup((caddr_t)&tp->t_rawq);
- }
- if (t_flags&ECHO) {
- ttyoutput(c, tp);
- if (c==tp->t_kill && (t_flags&(RAW|CBREAK))==0)
- ttyoutput('\n', tp);
- ttstart(tp);
- }
- }
-
-
- /*
- * Send stop character on input overflow.
- */
- ttyblock(tp)
- register struct tty *tp;
- {
- register x;
- x = q1.c_cc + q2.c_cc;
- if (q1.c_cc > TTYHOG) {
- flushtty(tp);
- tp->t_state &= ~TBLOCK;
- }
- if (x >= TTYHOG/2) {
- if (putc(tun.t_stopc, &tp->t_outq)==0) {
- tp->t_state |= TBLOCK;
- tp->t_char++;
- ttstart(tp);
- }
- }
- }
-
- /*
- * put character on TTY output queue, adding delays,
- * expanding tabs, and handling the CR/NL bit.
- * It is called both from the top half for output, and from
- * interrupt level for echoing.
- * The arguments are the character and the tty structure.
- */
- ttyoutput(c, tp)
- register c;
- register struct tty *tp;
- {
- register char *colp;
- register ctype;
-
- tk_nout += 1;
- /*
- * Ignore EOT in normal mode to avoid hanging up
- * certain terminals.
- * In raw mode dump the char unchanged.
- */
-
- if ((tp->t_flags&RAW)==0) {
- c &= 0177;
- if (c==CEOT)
- return;
- } else {
- putc(c, &tp->t_outq);
- return;
- }
-
- /*
- * Turn tabs to spaces as required
- */
- if (c=='\t' && (tp->t_flags&TBDELAY)==XTABS) {
- c = 8;
- do
- ttyoutput(' ', tp);
- while (--c >= 0 && tp->t_col&07);
- return;
- }
- /*
- * for upper-case-only terminals,
- * generate escapes.
- */
- if (tp->t_flags&LCASE) {
- colp = "({)}!|^~'`";
- while(*colp++)
- if(c == *colp++) {
- ttyoutput('\\', tp);
- c = colp[-2];
- break;
- }
- if ('a'<=c && c<='z')
- c += 'A' - 'a';
- }
- /*
- * turn <nl> to <cr><lf> if desired.
- */
- if (c=='\n' && tp->t_flags&CRMOD)
- ttyoutput('\r', tp);
- putc(c, &tp->t_outq);
- /*
- * Calculate delays.
- * The numbers here represent clock ticks
- * and are not necessarily optimal for all terminals.
- * The delays are indicated by characters above 0200.
- * In raw mode there are no delays and the
- * transmission path is 8 bits wide.
- */
- colp = &tp->t_col;
- ctype = partab[c];
- c = 0;
- switch (ctype&077) {
-
- /* ordinary */
- case 0:
- (*colp)++;
-
- /* non-printing */
- case 1:
- break;
-
- /* backspace */
- case 2:
- if (*colp)
- (*colp)--;
- break;
-
- /* newline */
- case 3:
- ctype = (tp->t_flags >> 8) & 03;
- if(ctype == 1) { /* tty 37 */
- if (*colp)
- c = max(((unsigned)*colp>>4) + 3, (unsigned)6);
- } else
- if(ctype == 2) { /* vt05 */
- c = 6;
- }
- *colp = 0;
- break;
-
- /* tab */
- case 4:
- ctype = (tp->t_flags >> 10) & 03;
- if(ctype == 1) { /* tty 37 */
- c = 1 - (*colp | ~07);
- if(c < 5)
- c = 0;
- }
- *colp |= 07;
- (*colp)++;
- break;
-
- /* vertical motion */
- case 5:
- if(tp->t_flags & VTDELAY) /* tty 37 */
- c = 0177;
- break;
-
- /* carriage return */
- case 6:
- ctype = (tp->t_flags >> 12) & 03;
- if(ctype == 1) { /* tn 300 */
- c = 5;
- } else if(ctype == 2) { /* ti 700 */
- c = 10;
- }
- *colp = 0;
- }
- if(c)
- putc(c|0200, &tp->t_outq);
- }
-
- /*
- * Restart typewriter output following a delay
- * timeout.
- * The name of the routine is passed to the timeout
- * subroutine and it is called during a clock interrupt.
- */
- ttrstrt(tp)
- register struct tty *tp;
- {
-
- tp->t_state &= ~TIMEOUT;
- ttstart(tp);
- }
-
- /*
- * Start output on the typewriter. It is used from the top half
- * after some characters have been put on the output queue,
- * from the interrupt routine to transmit the next
- * character, and after a timeout has finished.
- */
- ttstart(tp)
- register struct tty *tp;
- {
- register s;
-
- s = spl5();
- if((tp->t_state&(TIMEOUT|TTSTOP|BUSY)) == 0)
- (*tp->t_oproc)(tp);
- splx(s);
- }
-
- /*
- * Called from device's read routine after it has
- * calculated the tty-structure given as argument.
- */
- ttread(tp)
- register struct tty *tp;
- {
-
- if ((tp->t_state&CARR_ON)==0)
- return(0);
- if (tp->t_canq.c_cc || canon(tp))
- while (tp->t_canq.c_cc && passc(getc(&tp->t_canq))>=0)
- ;
- return(tp->t_rawq.c_cc + tp->t_canq.c_cc);
- }
-
- /*
- * Called from the device's write routine after it has
- * calculated the tty-structure given as argument.
- */
- caddr_t
- ttwrite(tp)
- register struct tty *tp;
- {
- register c;
-
- if ((tp->t_state&CARR_ON)==0)
- return(NULL);
- while (u.u_count) {
- spl5();
- while (tp->t_outq.c_cc > TTHIWAT) {
- ttstart(tp);
- tp->t_state |= ASLEEP;
- if (tp->t_chan)
- return((caddr_t)&tp->t_outq);
- sleep((caddr_t)&tp->t_outq, TTOPRI);
- }
- spl0();
- if ((c = cpass()) < 0)
- break;
- ttyoutput(c, tp);
- }
- ttstart(tp);
- return(NULL);
- }
-
-