+
+/*
+ * Establish 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 &= ~TS_WOPEN;
+ tp->t_state |= TS_ISOPEN;
+ if (tp->t_line != NTTYDISC)
+ ttywflush(tp);
+ return (0);
+}
+
+/*
+ * clean tp on last close
+ */
+ttyclose(tp)
+ register struct tty *tp;
+{
+
+ if (tp->t_line) {
+ ttywflush(tp);
+ tp->t_line = 0;
+ return;
+ }
+ tp->t_pgrp = 0;
+ ttywflush(tp);
+ tp->t_state = 0;
+}
+
+/*
+ * reinput pending characters after state switch
+ * call at spl5().
+ */
+ttypend(tp)
+ register struct tty *tp;
+{
+ struct clist tq;
+ register c;
+
+ tp->t_flags &= ~PENDIN;
+ tp->t_state |= TS_TYPEN;
+ tq = tp->t_rawq;
+ tp->t_rawq.c_cc = 0;
+ tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0;
+ while ((c = getc(&tq)) >= 0)
+ ttyinput(c, tp);
+ tp->t_state &= ~TS_TYPEN;
+}
+
+/*
+ * 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 = tp->t_flags;
+ int i;
+
+ /*
+ * If input is pending take it first.
+ */
+ if (t_flags&PENDIN)
+ ttypend(tp);
+ tk_nin++;
+ c &= 0377;
+
+ /*
+ * In tandem mode, check high water mark.
+ */
+ if (t_flags&TANDEM)
+ ttyblock(tp);
+
+ if (t_flags&RAW) {
+ /*
+ * Raw mode, just put character
+ * in input q w/o interpretation.
+ */
+ if (tp->t_rawq.c_cc > TTYHOG)
+ ttyflush(tp, FREAD|FWRITE);
+ else {
+ if (putc(c, &tp->t_rawq) >= 0)
+ ttwakeup(tp);
+ ttyecho(c, tp);
+ }
+ goto endcase;
+ }
+
+ /*
+ * Ignore any high bit added during
+ * previous ttyinput processing.
+ */
+ if ((tp->t_state&TS_TYPEN) == 0)
+ c &= 0177;
+ /*
+ * Check for literal nexting very first
+ */
+ if (tp->t_state&TS_LNCH) {
+ c |= 0200;
+ tp->t_state &= ~TS_LNCH;
+ }
+
+ /*
+ * Scan for special characters. This code
+ * is really just a big case statement with
+ * non-constant cases. The bottom of the
+ * case statement is labeled ``endcase'', so goto
+ * it after a case match, or similar.
+ */
+ if (tp->t_line == NTTYDISC) {
+ if (c == tp->t_lnextc) {
+ if (tp->t_flags&ECHO)
+ ttyout("^\b", tp);
+ tp->t_state |= TS_LNCH;
+ goto endcase;
+ }
+ if (c == tp->t_flushc) {
+ if (tp->t_flags&FLUSHO)
+ tp->t_flags &= ~FLUSHO;
+ else {
+ ttyflush(tp, FWRITE);
+ ttyecho(c, tp);
+ if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
+ ttyretype(tp);
+ tp->t_flags |= FLUSHO;
+ }
+ goto startoutput;
+ }
+ if (c == tp->t_suspc) {
+ if ((tp->t_flags&NOFLSH) == 0)
+ ttyflush(tp, FREAD);
+ ttyecho(c, tp);
+ gsignal(tp->t_pgrp, SIGTSTP);
+ goto endcase;
+ }
+ }
+
+ /*
+ * Handle start/stop characters.
+ */
+ if (c == tp->t_stopc) {
+ if ((tp->t_state&TS_TTSTOP) == 0) {
+ tp->t_state |= TS_TTSTOP;
+ (*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
+ return;
+ }
+ if (c != tp->t_startc)
+ return;
+ goto endcase;
+ }
+ if (c == tp->t_startc)
+ goto restartoutput;
+
+ /*
+ * Look for interrupt/quit chars.
+ */
+ if (c == tp->t_intrc || c == tp->t_quitc) {
+ if ((tp->t_flags&NOFLSH) == 0)
+ ttyflush(tp, FREAD|FWRITE);
+ ttyecho(c, tp);
+ gsignal(tp->t_pgrp, c == tp->t_intrc ? SIGINT : SIGQUIT);
+ goto endcase;
+ }
+
+ /*
+ * Cbreak mode, don't process line editing
+ * characters; check high water mark for wakeup.
+ */
+ if (t_flags&CBREAK) {
+ if (tp->t_rawq.c_cc > TTYHOG) {
+ if (tp->t_outq.c_cc < TTHIWAT(tp) &&
+ tp->t_line == NTTYDISC)
+ (void) ttyoutput(CTRL(g), tp);
+ } else if (putc(c, &tp->t_rawq) >= 0) {
+ ttwakeup(tp);
+ ttyecho(c, tp);
+ }
+ goto endcase;
+ }
+
+ /*
+ * From here on down cooked mode character
+ * processing takes place.
+ */
+ if ((tp->t_state&TS_QUOT) &&
+ (c == tp->t_erase || c == tp->t_kill)) {
+ ttyrub(unputc(&tp->t_rawq), tp);
+ c |= 0200;
+ }
+ if (c == tp->t_erase) {
+ if (tp->t_rawq.c_cc)
+ ttyrub(unputc(&tp->t_rawq), tp);
+ goto endcase;
+ }
+ if (c == tp->t_kill) {
+ if (tp->t_flags&CRTKIL &&
+ tp->t_rawq.c_cc == tp->t_rocount) {
+ while (tp->t_rawq.c_cc)
+ ttyrub(unputc(&tp->t_rawq), tp);
+ } else {
+ ttyecho(c, tp);
+ ttyecho('\n', tp);
+ while (getc(&tp->t_rawq) > 0)
+ ;
+ tp->t_rocount = 0;
+ }
+ tp->t_state &= ~TS_LOCAL;
+ goto endcase;
+ }
+
+ /*
+ * New line discipline,
+ * check word erase/reprint line.
+ */
+ if (tp->t_line == NTTYDISC) {
+ if (c == tp->t_werasc) {
+ if (tp->t_rawq.c_cc == 0)
+ goto endcase;
+ do {
+ c = unputc(&tp->t_rawq);
+ if (c != ' ' && c != '\t')
+ goto erasenb;
+ ttyrub(c, tp);
+ } while (tp->t_rawq.c_cc);
+ goto endcase;
+ erasenb:
+ do {
+ ttyrub(c, tp);
+ if (tp->t_rawq.c_cc == 0)
+ goto endcase;
+ c = unputc(&tp->t_rawq);
+ } while (c != ' ' && c != '\t');
+ (void) putc(c, &tp->t_rawq);
+ goto endcase;
+ }
+ if (c == tp->t_rprntc) {
+ ttyretype(tp);
+ goto endcase;
+ }
+ }
+
+ /*
+ * Check for input buffer overflow
+ */
+ if (tp->t_rawq.c_cc+tp->t_canq.c_cc >= TTYHOG) {
+ if (tp->t_line == NTTYDISC)
+ (void) ttyoutput(CTRL(g), tp);
+ goto endcase;
+ }
+
+ /*
+ * Put data char in q for user and
+ * wakeup on seeing a line delimiter.
+ */
+ if (putc(c, &tp->t_rawq) >= 0) {
+ if (ttbreakc(c, tp)) {
+ tp->t_rocount = 0;
+ catq(&tp->t_rawq, &tp->t_canq);
+ ttwakeup(tp);
+ } else if (tp->t_rocount++ == 0)
+ tp->t_rocol = tp->t_col;
+ tp->t_state &= ~TS_QUOT;
+ if (c == '\\')
+ tp->t_state |= TS_QUOT;
+ if (tp->t_state&TS_ERASE) {
+ tp->t_state &= ~TS_ERASE;
+ (void) ttyoutput('/', tp);
+ }
+ i = tp->t_col;
+ ttyecho(c, tp);
+ if (c == tp->t_eofc && tp->t_flags&ECHO) {
+ i = MIN(2, tp->t_col - i);
+ while (i > 0) {
+ (void) ttyoutput('\b', tp);
+ i--;
+ }
+ }
+ }
+
+endcase:
+ /*
+ * If DEC-style start/stop is enabled don't restart
+ * output until seeing the start character.
+ */
+ if (tp->t_flags&DECCTQ && tp->t_state&TS_TTSTOP &&
+ tp->t_startc != tp->t_stopc)
+ return;
+
+restartoutput:
+ tp->t_state &= ~TS_TTSTOP;
+ tp->t_flags &= ~FLUSHO;
+
+startoutput:
+ ttstart(tp);
+}
+
+/*
+ * Put character on TTY output queue, adding delays,
+ * expanding tabs, and handling the CR/NL bit.
+ * This is called both from the top half for output,
+ * and from interrupt level for echoing.
+ * The arguments are the character and the tty structure.
+ * Returns < 0 if putc succeeds, otherwise returns char to resend
+ * Must be recursive.
+ */
+ttyoutput(c, tp)
+ register c;
+ register struct tty *tp;
+{
+ register char *colp;
+ register ctype;
+
+ if (tp->t_flags & (RAW|LITOUT)) {
+ if (tp->t_flags&FLUSHO)
+ return (-1);
+ if (putc(c, &tp->t_outq))
+ return (c);
+ tk_nout++;
+ return (-1);
+ }
+
+ /*
+ * Ignore EOT in normal mode to avoid
+ * hanging up certain terminals.
+ */
+ c &= 0177;
+ if (c == CEOT && (tp->t_flags&CBREAK) == 0)
+ return (-1);
+ /*
+ * Turn tabs to spaces as required
+ */
+ if (c == '\t' && (tp->t_flags&TBDELAY) == XTABS) {
+ register int s;
+
+ c = 8 - (tp->t_col&7);
+ if ((tp->t_flags&FLUSHO) == 0) {
+ s = spl5(); /* don't interrupt tabs */
+ c -= b_to_q(" ", c, &tp->t_outq);
+ tk_nout += c;
+ splx(s);
+ }
+ tp->t_col += c;
+ return (c ? -1 : '\t');
+ }
+ tk_nout++;
+ /*
+ * for upper-case-only terminals,
+ * generate escapes.
+ */
+ if (tp->t_flags&LCASE) {
+ colp = "({)}!|^~'`";
+ while (*colp++)
+ if (c == *colp++) {
+ if (ttyoutput('\\', tp) >= 0)
+ return (c);
+ c = colp[-2];
+ break;
+ }
+ if ('A' <= c && c <= 'Z') {
+ if (ttyoutput('\\', tp) >= 0)
+ return (c);
+ } else if ('a' <= c && c <= 'z')
+ c += 'A' - 'a';
+ }
+
+ /*
+ * turn <nl> to <cr><lf> if desired.
+ */
+ if (c == '\n' && tp->t_flags&CRMOD)
+ if (ttyoutput('\r', tp) >= 0)
+ return (c);
+ if (c == '~' && tp->t_flags&TILDE)
+ c = '`';
+ if ((tp->t_flags&FLUSHO) == 0 && putc(c, &tp->t_outq))
+ return (c);
+ /*
+ * 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.
+ *
+ * SHOULD JUST ALLOW USER TO SPECIFY DELAYS
+ */
+ colp = &tp->t_col;
+ ctype = partab[c];
+ c = 0;
+ switch (ctype&077) {
+
+ case ORDINARY:
+ (*colp)++;
+
+ case CONTROL:
+ break;
+
+ case BACKSPACE:
+ if (*colp)
+ (*colp)--;
+ break;
+
+ /*
+ * This macro is close enough to the correct thing;
+ * it should be replaced by real user settable delays
+ * in any event...
+ */
+#define mstohz(ms) (((ms) * hz) >> 10)
+ case NEWLINE:
+ ctype = (tp->t_flags >> 8) & 03;
+ if (ctype == 1) { /* tty 37 */
+ if (*colp > 0)
+ c = max((((unsigned)*colp) >> 4) + 3,
+ (unsigned)6);
+ } else if (ctype == 2) /* vt05 */
+ c = mstohz(100);
+ *colp = 0;
+ break;
+
+ case TAB:
+ ctype = (tp->t_flags >> 10) & 03;
+ if (ctype == 1) { /* tty 37 */
+ c = 1 - (*colp | ~07);
+ if (c < 5)
+ c = 0;
+ }
+ *colp |= 07;
+ (*colp)++;
+ break;
+
+ case VTAB:
+ if (tp->t_flags&VTDELAY) /* tty 37 */
+ c = 0177;
+ break;
+
+ case RETURN:
+ ctype = (tp->t_flags >> 12) & 03;
+ if (ctype == 1) /* tn 300 */
+ c = mstohz(83);
+ else if (ctype == 2) /* ti 700 */
+ c = mstohz(166);
+ else if (ctype == 3) { /* concept 100 */
+ int i;
+
+ if ((i = *colp) >= 0)
+ for (; i < 9; i++)
+ (void) putc(0177, &tp->t_outq);
+ }
+ *colp = 0;
+ }
+ if (c && (tp->t_flags&FLUSHO) == 0)
+ (void) putc(c|0200, &tp->t_outq);
+ return (-1);
+}
+#undef mstohz
+
+/*
+ * Called from device's read routine after it has
+ * calculated the tty-structure given as argument.
+ */
+ttread(tp, uio)
+ register struct tty *tp;
+ struct uio *uio;
+{
+ register struct clist *qp;
+ register c, t_flags;
+ int s, first, error = 0;
+
+ if ((tp->t_state&TS_CARR_ON)==0)
+ return (EIO);
+loop:
+ /*
+ * Take any pending input first.
+ */
+ s = spl5();
+ if (tp->t_flags&PENDIN)
+ ttypend(tp);
+ splx(s);
+
+ /*
+ * Hang process if it's in the background.
+ */
+#define bit(a) (1<<(a-1))
+ while (tp == u.u_ttyp && u.u_procp->p_pgrp != tp->t_pgrp) {
+ if ((u.u_procp->p_sigignore & bit(SIGTTIN)) ||
+ (u.u_procp->p_sigmask & bit(SIGTTIN)) ||
+/*
+ (u.u_procp->p_flag&SDETACH) ||
+*/
+ u.u_procp->p_flag&SVFORK)
+ return (EIO);
+ gsignal(u.u_procp->p_pgrp, SIGTTIN);
+ sleep((caddr_t)&lbolt, TTIPRI);
+ }
+ t_flags = tp->t_flags;
+#undef bit
+
+ /*
+ * In raw mode take characters directly from the
+ * raw queue w/o processing. Interlock against
+ * device interrupts when interrogating rawq.
+ */
+ if (t_flags&RAW) {
+ s = spl5();
+ if (tp->t_rawq.c_cc <= 0) {
+ if ((tp->t_state&TS_CARR_ON) == 0 ||
+ (tp->t_state&TS_NBIO)) {
+ splx(s);
+ return (EWOULDBLOCK);
+ }
+ sleep((caddr_t)&tp->t_rawq, TTIPRI);
+ splx(s);
+ goto loop;
+ }
+ splx(s);
+ while (!error && tp->t_rawq.c_cc && uio->uio_resid)
+ error = ureadc(getc(&tp->t_rawq), uio);
+ goto checktandem;
+ }
+
+ /*
+ * In cbreak mode use the rawq, otherwise
+ * take characters from the canonicalized q.
+ */
+ qp = t_flags&CBREAK ? &tp->t_rawq : &tp->t_canq;
+
+ /*
+ * No input, sleep on rawq awaiting hardware
+ * receipt and notification.
+ */
+ s = spl5();
+ if (qp->c_cc <= 0) {
+ if ((tp->t_state&TS_CARR_ON) == 0 ||
+ (tp->t_state&TS_NBIO)) {
+ splx(s);
+ return (EWOULDBLOCK);
+ }
+ sleep((caddr_t)&tp->t_rawq, TTIPRI);
+ splx(s);
+ goto loop;
+ }
+ splx(s);
+
+ /*
+ * Input present, perform input mapping
+ * and processing (we're not in raw mode).
+ */
+ first = 1;
+ while ((c = getc(qp)) >= 0) {
+ if (t_flags&CRMOD && c == '\r')
+ c = '\n';
+ /*
+ * Hack lower case simulation on
+ * upper case only terminals.
+ */
+ if (t_flags&LCASE && c <= 0177)
+ if (tp->t_state&TS_BKSL) {
+ if (maptab[c])
+ c = maptab[c];
+ tp->t_state &= ~TS_BKSL;
+ } else if (c >= 'A' && c <= 'Z')
+ c += 'a' - 'A';
+ else if (c == '\\') {
+ tp->t_state |= TS_BKSL;
+ continue;
+ }
+ /*
+ * Check for delayed suspend character.
+ */
+ if (tp->t_line == NTTYDISC && c == tp->t_dsuspc) {
+ gsignal(tp->t_pgrp, SIGTSTP);
+ if (first) {
+ sleep((caddr_t)&lbolt, TTIPRI);
+ goto loop;
+ }
+ break;
+ }
+ /*
+ * Interpret EOF only in cooked mode.
+ */
+ if (c == tp->t_eofc && (t_flags&CBREAK) == 0)
+ break;
+ /*
+ * Give user character.
+ */
+ error = ureadc(c & 0177, uio);
+ if (error)
+ break;
+ if (uio->uio_resid == 0)
+ break;
+ /*
+ * In cooked mode check for a "break character"
+ * marking the end of a "line of input".
+ */
+ if ((t_flags&CBREAK) == 0 && ttbreakc(c, tp))
+ break;
+ first = 0;
+ }
+ tp->t_state &= ~TS_BKSL;
+
+checktandem:
+ /*
+ * Look to unblock output now that (presumably)
+ * the input queue has gone down.
+ */
+ if (tp->t_state&TS_TBLOCK && tp->t_rawq.c_cc < TTYHOG/5)
+ if (putc(tp->t_startc, &tp->t_outq) == 0) {
+ tp->t_state &= ~TS_TBLOCK;
+ ttstart(tp);
+ }
+ return (error);
+}
+
+/*
+ * Called from the device's write routine after it has
+ * calculated the tty-structure given as argument.
+ */
+ttwrite(tp, uio)
+ register struct tty *tp;
+ register struct uio *uio;
+{
+ register char *cp;
+ register int cc, ce, c;
+ int i, hiwat, cnt, error, s;
+ char obuf[OBUFSIZ];
+
+ if ((tp->t_state&TS_CARR_ON) == 0)
+ return (EIO);
+ hiwat = TTHIWAT(tp);
+ cnt = uio->uio_resid;
+ error = 0;
+loop:
+ /*
+ * Hang the process if it's in the background.
+ */
+#define bit(a) (1<<(a-1))
+ while (u.u_procp->p_pgrp != tp->t_pgrp && tp == u.u_ttyp &&
+ (tp->t_flags&TOSTOP) && (u.u_procp->p_flag&SVFORK)==0 &&
+ !(u.u_procp->p_sigignore & bit(SIGTTOU)) &&
+ !(u.u_procp->p_sigmask & bit(SIGTTOU))
+/*
+ &&
+ (u.u_procp->p_flag&SDETACH)==0) {
+*/
+ ) {
+ gsignal(u.u_procp->p_pgrp, SIGTTOU);
+ sleep((caddr_t)&lbolt, TTIPRI);
+ }
+#undef bit
+
+ /*
+ * Process the user's data in at most OBUFSIZ
+ * chunks. Perform lower case simulation and
+ * similar hacks. Keep track of high water
+ * mark, sleep on overflow awaiting device aid
+ * in acquiring new space.
+ */
+ while (uio->uio_resid > 0) {
+ /*
+ * Grab a hunk of data from the user.
+ */
+ cc = uio->uio_iov->iov_len;
+ if (cc == 0) {
+ uio->uio_iovcnt--;
+ uio->uio_iov++;
+ if (uio->uio_iovcnt < 0)
+ panic("ttwrite");
+ continue;
+ }
+ if (cc > OBUFSIZ)
+ cc = OBUFSIZ;
+ cp = obuf;
+ error = uiomove(cp, cc, UIO_WRITE, uio);
+ if (error)
+ break;
+ if (tp->t_outq.c_cc > hiwat)
+ goto ovhiwat;
+ if (tp->t_flags&FLUSHO)
+ continue;
+ /*
+ * If we're mapping lower case or kludging tildes,
+ * then we've got to look at each character, so
+ * just feed the stuff to ttyoutput...
+ */
+ if (tp->t_flags & (LCASE|TILDE)) {
+ while (cc > 0) {
+ c = *cp++;
+ tp->t_rocount = 0;
+ while ((c = ttyoutput(c, tp)) >= 0) {
+ /* out of clists, wait a bit */
+ ttstart(tp);
+ sleep((caddr_t)&lbolt, TTOPRI);
+ tp->t_rocount = 0;
+ }
+ --cc;
+ if (tp->t_outq.c_cc > hiwat)
+ goto ovhiwat;
+ }
+ continue;
+ }
+ /*
+ * If nothing fancy need be done, grab those characters we
+ * can handle without any of ttyoutput's processing and
+ * just transfer them to the output q. For those chars
+ * which require special processing (as indicated by the
+ * bits in partab), call ttyoutput. After processing
+ * a hunk of data, look for FLUSHO so ^O's will take effect
+ * immediately.
+ */
+ while (cc > 0) {
+ if (tp->t_flags & (RAW|LITOUT))
+ ce = cc;
+ else {
+ ce = cc - scanc((unsigned)cc, (caddr_t)cp,
+ (caddr_t)partab, 077);
+ /*
+ * If ce is zero, then we're processing
+ * a special character through ttyoutput.
+ */
+ if (ce == 0) {
+ tp->t_rocount = 0;
+ if (ttyoutput(*cp, tp) >= 0) {
+ /* no c-lists, wait a bit */
+ ttstart(tp);
+ sleep((caddr_t)&lbolt, TTOPRI);
+ continue;
+ }
+ cp++, cc--;
+ if (tp->t_flags&FLUSHO ||
+ tp->t_outq.c_cc > hiwat)
+ goto ovhiwat;
+ continue;
+ }
+ }
+ /*
+ * A bunch of normal characters have been found,
+ * transfer them en masse to the output queue and
+ * continue processing at the top of the loop.
+ * If there are any further characters in this
+ * <= OBUFSIZ chunk, the first should be a character
+ * requiring special handling by ttyoutput.
+ */
+ tp->t_rocount = 0;
+ i = b_to_q(cp, ce, &tp->t_outq);
+ ce -= i;
+ tp->t_col += ce;
+ cp += ce, cc -= ce, tk_nout += ce;
+ if (i > 0) {
+ /* out of c-lists, wait a bit */
+ ttstart(tp);
+ sleep((caddr_t)&lbolt, TTOPRI);
+ }
+ if (tp->t_flags&FLUSHO || tp->t_outq.c_cc > hiwat)
+ goto ovhiwat;
+ }
+ }
+ ttstart(tp);
+ return (error);
+
+ovhiwat:
+ s = spl5();
+ if (cc != 0) {
+ uio->uio_iov->iov_base -= cc;
+ uio->uio_iov->iov_len += cc;
+ uio->uio_resid += cc;
+ uio->uio_offset -= cc;
+ }
+ /*
+ * This can only occur if FLUSHO
+ * is also set in t_flags.
+ */
+ if (tp->t_outq.c_cc <= hiwat) {
+ splx(s);
+ goto loop;
+ }
+ ttstart(tp);
+ if (tp->t_state&TS_NBIO) {
+ if (uio->uio_resid == cnt)
+ return (EWOULDBLOCK);
+ return (0);
+ }
+ tp->t_state |= TS_ASLEEP;
+ sleep((caddr_t)&tp->t_outq, TTOPRI);
+ splx(s);
+ goto loop;
+}
+
+/*
+ * Rubout one character from the rawq of tp
+ * as cleanly as possible.
+ */
+ttyrub(c, tp)
+ register c;
+ register struct tty *tp;
+{
+ register char *cp;
+ register int savecol;
+ int s;
+ char *nextc();
+
+ if ((tp->t_flags&ECHO) == 0)
+ return;
+ tp->t_flags &= ~FLUSHO;
+ c &= 0377;
+ if (tp->t_flags&CRTBS) {
+ if (tp->t_rocount == 0) {
+ /*
+ * Screwed by ttwrite; retype
+ */
+ ttyretype(tp);
+ return;
+ }
+ if (c == ('\t'|0200) || c == ('\n'|0200))
+ ttyrubo(tp, 2);
+ else switch (partab[c&=0177]&0177) {
+
+ case ORDINARY:
+ if (tp->t_flags&LCASE && c >= 'A' && c <= 'Z')
+ ttyrubo(tp, 2);
+ else
+ ttyrubo(tp, 1);
+ break;
+
+ case VTAB:
+ case BACKSPACE:
+ case CONTROL:
+ case RETURN:
+ if (tp->t_flags&CTLECH)
+ ttyrubo(tp, 2);
+ break;
+
+ case TAB:
+ if (tp->t_rocount < tp->t_rawq.c_cc) {
+ ttyretype(tp);
+ return;
+ }
+ s = spl5();
+ savecol = tp->t_col;
+ tp->t_state |= TS_CNTTB;
+ tp->t_flags |= FLUSHO;
+ tp->t_col = tp->t_rocol;
+ cp = tp->t_rawq.c_cf;
+ for (; cp; cp = nextc(&tp->t_rawq, cp))
+ ttyecho(*cp, tp);
+ tp->t_flags &= ~FLUSHO;
+ tp->t_state &= ~TS_CNTTB;
+ splx(s);
+ /*
+ * savecol will now be length of the tab
+ */
+ savecol -= tp->t_col;
+ tp->t_col += savecol;
+ if (savecol > 8)
+ savecol = 8; /* overflow screw */
+ while (--savecol >= 0)
+ (void) ttyoutput('\b', tp);
+ break;
+
+ default:
+ panic("ttyrub");
+ }
+ } else if (tp->t_flags&PRTERA) {
+ if ((tp->t_state&TS_ERASE) == 0) {
+ (void) ttyoutput('\\', tp);
+ tp->t_state |= TS_ERASE;
+ }
+ ttyecho(c, tp);
+ } else
+ ttyecho(tp->t_erase, tp);
+ tp->t_rocount--;
+}
+
+/*
+ * Crt back over cnt chars perhaps
+ * erasing them.
+ */
+ttyrubo(tp, cnt)
+ register struct tty *tp;
+ int cnt;
+{
+ register char *rubostring = tp->t_flags&CRTERA ? "\b \b" : "\b";
+
+ while (--cnt >= 0)
+ ttyout(rubostring, tp);
+}
+
+/*
+ * Reprint the rawq line.
+ * We assume c_cc has already been checked.
+ */
+ttyretype(tp)
+ register struct tty *tp;
+{
+ register char *cp;
+ char *nextc();
+ int s;
+
+ if (tp->t_rprntc != 0377)
+ ttyecho(tp->t_rprntc, tp);
+ (void) ttyoutput('\n', tp);
+ s = spl5();
+ for (cp = tp->t_canq.c_cf; cp; cp = nextc(&tp->t_canq, cp))
+ ttyecho(*cp, tp);
+ for (cp = tp->t_rawq.c_cf; cp; cp = nextc(&tp->t_rawq, cp))
+ ttyecho(*cp, tp);
+ tp->t_state &= ~TS_ERASE;
+ splx(s);
+ tp->t_rocount = tp->t_rawq.c_cc;
+ tp->t_rocol = 0;
+}
+
+/*
+ * Echo a typed character to the terminal
+ */
+ttyecho(c, tp)
+ register c;
+ register struct tty *tp;
+{
+
+ if ((tp->t_state&TS_CNTTB) == 0)
+ tp->t_flags &= ~FLUSHO;
+ if ((tp->t_flags&ECHO) == 0)
+ return;
+ c &= 0377;
+ if (tp->t_flags&RAW) {
+ (void) ttyoutput(c, tp);
+ return;
+ }
+ if (c == '\r' && tp->t_flags&CRMOD)
+ c = '\n';
+ if (tp->t_flags&CTLECH) {
+ if ((c&0177) <= 037 && c!='\t' && c!='\n' || (c&0177)==0177) {
+ (void) ttyoutput('^', tp);
+ c &= 0177;
+ if (c == 0177)
+ c = '?';
+ else if (tp->t_flags&LCASE)
+ c += 'a' - 1;
+ else
+ c += 'A' - 1;
+ }
+ }
+ if ((tp->t_flags&LCASE) && (c >= 'A' && c <= 'Z'))
+ c += 'a' - 'A';
+ (void) ttyoutput(c&0177, tp);
+}
+
+/*
+ * Is c a break char for tp?
+ */
+ttbreakc(c, tp)
+ register c;
+ register struct tty *tp;
+{
+ return (c == '\n' || c == tp->t_eofc || c == tp->t_brkc ||
+ c == '\r' && (tp->t_flags&CRMOD));
+}
+
+/*
+ * send string cp to tp
+ */
+ttyout(cp, tp)
+ register char *cp;
+ register struct tty *tp;
+{
+ register char c;
+
+ while (c = *cp++)
+ (void) ttyoutput(c, tp);
+}
+
+ttwakeup(tp)
+ struct tty *tp;
+{
+
+ if (tp->t_rsel) {
+ selwakeup(tp->t_rsel, tp->t_state&TS_RCOLL);
+ tp->t_state &= ~TS_RCOLL;
+ tp->t_rsel = 0;
+ }
+ if (tp->t_state & TS_ASYNC)
+ gsignal(tp->t_pgrp, SIGIO);
+ wakeup((caddr_t)&tp->t_rawq);
+}
+
+#if !defined(vax)
+scanc(size, cp, table, mask)
+ register int size;
+ register char *cp, table[];
+ register int mask;
+{
+ register int i = 0;
+
+ while ((table[*(u_char *)(cp + i)]&mask) == 0 && i < size)
+ i++;
+ return (size - i);
+}
+#endif
projects / unix-history / blobdiff