MiniUnix/usr/sys/mxsys/tty.c
#
/*
*/
/*
* general TTY subroutines
*/
#include "param.h"
#include "systm.h"
#include "user.h"
#include "tty.h"
#include "proc.h"
#include "inode.h"
#include "file.h"
#include "reg.h"
#include "conf.h"
/*
* 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[]
{
000,000,000,000,004,000,000,000,
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,
};
/*
* The actual structure of a clist block manipulated by
* getc and putc (mch.s)
*/
struct cblock {
struct cblock *c_next;
char info[6];
};
/* The character lists-- space for 6*NCLIST characters */
struct cblock cfree[NCLIST];
/* List head for unused character blocks. */
struct cblock *cfreelist;
/*
* structure of device registers for KL, DL, and DC
* interfaces-- more particularly, those for which the
* SSTART bit is off and can be treated by general routines
* (that is, not DH).
*/
struct {
int ttrcsr;
int ttrbuf;
int tttcsr;
int tttbuf;
};
/*
* routine called on first teletype open.
* establishes a process group for distribution
* of quits and interrupts from the tty.
*/
ttyopen(dev, atp)
struct tty *atp;
{
register struct proc *pp;
register struct tty *tp;
pp = u.u_procp;
tp = atp;
if(pp->p_pgrp == 0) {
pp->p_pgrp = pp->p_pid;
u.u_ttyp = tp;
u.u_ttyd = dev;
tp->t_pgrp = pp->p_pid;
}
tp->t_state =& ~WOPEN;
tp->t_state =| ISOPEN;
}
/*
* The routine implementing the gtty system call.
* Just call lower level routine and pass back values.
*/
gtty()
{
int v[3];
register *up, *vp;
vp = v;
sgtty(vp);
if (u.u_error)
return;
up = u.u_arg[0];
suword(up, *vp++);
suword(++up, *vp++);
suword(++up, *vp++);
}
/*
* The routine implementing the stty system call.
* Read in values and call lower level.
*/
stty()
{
register int *up;
up = u.u_arg[0];
u.u_arg[0] = fuword(up);
u.u_arg[1] = fuword(++up);
u.u_arg[2] = fuword(++up);
sgtty(0);
}
/*
* Stuff common to stty and gtty.
* Check legality and switch out to individual
* device routine.
* v is 0 for stty; the parameters are taken from u.u_arg[].
* c is non-zero for gtty and is the place in which the device
* routines place their information.
*/
sgtty(v)
int *v;
{
register struct file *fp;
register struct inode *ip;
if ((fp = getf(u.u_ar0[R0])) == NULL)
return;
ip = fp->f_inode;
if ((ip->i_mode&IFMT) != IFCHR) {
u.u_error = ENOTTY;
return;
}
(*cdevsw[ip->i_addr[0].d_major].d_sgtty)(ip->i_addr[0], v);
}
/*
* Wait for output to drain, then flush input waiting.
*/
wflushtty(atp)
struct tty *atp;
{
register struct tty *tp;
tp = atp;
spl5();
while (tp->t_outq.c_cc) {
tp->t_state =| ASLEEP;
sleep(&tp->t_outq, TTOPRI);
}
flushtty(tp);
spl0();
}
/*
* Initialize clist by freeing all character blocks, then count
* number of character devices. (Once-only routine)
*/
cinit()
{
register int ccp;
register struct cblock *cp;
register struct cdevsw *cdp;
ccp = cfree;
for (cp=(ccp+07)&~07; cp <= &cfree[NCLIST-1]; cp++) {
cp->c_next = cfreelist;
cfreelist = cp;
}
ccp = 0;
for(cdp = cdevsw; cdp->d_open; cdp++)
ccp++;
nchrdev = ccp;
}
/*
* flush all TTY queues
*/
flushtty(atp)
struct tty *atp;
{
register struct tty *tp;
register int sps;
tp = atp;
while (getc(&tp->t_canq) >= 0);
while (getc(&tp->t_outq) >= 0);
wakeup(&tp->t_rawq);
wakeup(&tp->t_outq);
sps = PS->integ;
spl5();
while (getc(&tp->t_rawq) >= 0);
tp->t_delct = 0;
PS->integ = sps;
}
/*
* 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(atp)
struct tty *atp;
{
register char *bp;
char *bp1;
register struct tty *tp;
register int c;
tp = atp;
spl5();
while (tp->t_delct==0) {
if ((tp->t_state&CARR_ON)==0)
return(0);
sleep(&tp->t_rawq, TTIPRI);
}
spl0();
loop:
bp = &canonb[2];
while ((c=getc(&tp->t_rawq)) >= 0) {
if (c==0377) {
tp->t_delct--;
break;
}
if ((tp->t_flags&RAW)==0) {
if (bp[-1]!='\\') {
if (c==tp->t_erase) {
if (bp > &canonb[2])
bp--;
continue;
}
if (c==tp->t_kill)
goto loop;
if (c==CEOT)
continue;
} else
if (maptab[c] && (maptab[c]==c || (tp->t_flags&LCASE))) {
if (bp[-2] != '\\')
c = maptab[c];
bp--;
}
}
*bp++ = c;
if (bp>=canonb+CANBSIZ)
break;
}
bp1 = bp;
bp = &canonb[2];
c = &tp->t_canq;
while (bp<bp1)
putc(*bp++, c);
return(1);
}
/*
* 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(ac, atp)
struct tty *atp;
{
register int t_flags, c;
register struct tty *tp;
tp = atp;
c = ac;
t_flags = tp->t_flags;
if ((c =& 0177) == '\r' && t_flags&CRMOD)
c = '\n';
if ((t_flags&RAW)==0 && (c==CQUIT || c==CINTR)) {
signal(tp->t_pgrp, c==CINTR? SIGINT:SIGQIT);
flushtty(tp);
return;
}
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 || c=='\n' || c==004) {
wakeup(&tp->t_rawq);
if (putc(0377, &tp->t_rawq)==0)
tp->t_delct++;
}
if (t_flags&ECHO) {
ttyoutput(c, tp);
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(ac, tp)
struct tty *tp;
{
register int c;
register struct tty *rtp;
register char *colp;
int ctype;
rtp = tp;
c = ac&0177;
/*
* Ignore EOT in normal mode to avoid hanging up
* certain terminals.
*/
if (c==004 && (rtp->t_flags&RAW)==0)
return;
/*
* Turn tabs to spaces as required
*/
if (c=='\t' && rtp->t_flags&XTABS) {
do
ttyoutput(' ', rtp);
while (rtp->t_col&07);
return;
}
/*
* for upper-case-only terminals,
* generate escapes.
*/
if (rtp->t_flags&LCASE) {
colp = "({)}!|^~'`";
while(*colp++)
if(c == *colp++) {
ttyoutput('\\', rtp);
c = colp[-2];
break;
}
if ('a'<=c && c<='z')
c =+ 'A' - 'a';
}
/*
* turn <nl> to <cr><lf> if desired.
*/
if (c=='\n' && rtp->t_flags&CRMOD)
ttyoutput('\r', rtp);
if (putc(c, &rtp->t_outq))
return;
/*
* Calculate delays.
* The numbers here represent clock ticks
* and are not necessarily optimal for all terminals.
* The delays are indicated by characters above 0200,
* thus (unfortunately) restricting the transmission
* path to 7 bits.
*/
colp = &rtp->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 = (rtp->t_flags >> 8) & 03;
if(ctype == 1) { /* tty 37 */
if (*colp)
c = max((*colp>>4) + 3, 6);
} else
if(ctype == 2) { /* vt05 */
c = 6;
}
*colp = 0;
break;
/* tab */
case 4:
ctype = (rtp->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(rtp->t_flags & VTDELAY) /* tty 37 */
c = 0177;
break;
/* carriage return */
case 6:
ctype = (rtp->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, &rtp->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(atp)
{
register struct tty *tp;
tp = atp;
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.
* If the SSTART bit is off for the tty the work is done here,
* using the protocol of the single-line interfaces (KL, DL, DC);
* otherwise the address word of the tty structure is
* taken to be the name of the device-dependent startup routine.
*/
ttstart(atp)
struct tty *atp;
{
register int *addr, c;
register struct tty *tp;
struct { int (*func)(); };
tp = atp;
addr = tp->t_addr;
if (tp->t_state&SSTART) {
(*addr.func)(tp);
return;
}
if ((addr->tttcsr&DONE)==0 || tp->t_state&TIMEOUT)
return;
if ((c=getc(&tp->t_outq)) >= 0) {
if (c<=0177)
addr->tttbuf = c | (partab[c]&0200);
else {
timeout(ttrstrt, tp, c&0177);
tp->t_state =| TIMEOUT;
}
}
}
/*
* Called from device's read routine after it has
* calculated the tty-structure given as argument.
* The pc is backed up for the duration of this call.
* In case of a caught interrupt, an RTI will re-execute.
*/
ttread(atp)
struct tty *atp;
{
register struct tty *tp;
tp = atp;
if ((tp->t_state&CARR_ON)==0)
return;
if (tp->t_canq.c_cc || canon(tp))
while (tp->t_canq.c_cc && passc(getc(&tp->t_canq))>=0);
}
/*
* Called from the device's write routine after it has
* calculated the tty-structure given as argument.
*/
ttwrite(atp)
struct tty *atp;
{
register struct tty *tp;
register int c;
tp = atp;
if ((tp->t_state&CARR_ON)==0)
return;
while ((c=cpass())>=0) {
spl5();
while (tp->t_outq.c_cc > TTHIWAT) {
ttstart(tp);
tp->t_state =| ASLEEP;
sleep(&tp->t_outq, TTOPRI);
}
spl0();
ttyoutput(c, tp);
}
ttstart(tp);
}
/*
* Common code for gtty and stty functions on typewriters.
* If v is non-zero then gtty is being done and information is
* passed back therein;
* if it is zero stty is being done and the input information is in the
* u_arg array.
*/
ttystty(atp, av)
int *atp, *av;
{
register *tp, *v;
tp = atp;
if(v = av) {
*v++ = tp->t_speeds;
v->lobyte = tp->t_erase;
v->hibyte = tp->t_kill;
v[1] = tp->t_flags;
return(1);
}
wflushtty(tp);
v = u.u_arg;
tp->t_speeds = *v++;
tp->t_erase = v->lobyte;
tp->t_kill = v->hibyte;
tp->t_flags = v[1];
return(0);
}