usr/src/sys/kern/tty_subr.c

/*-
 * Copyright (c) 1982, 1986 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.proprietary.c%
 *
 *	@(#)tty_subr.c	7.9 (Berkeley) %G%
 */

#include "param.h"
#include "systm.h"
#include "buf.h"
#include "ioctl.h"
#include "proc.h"
#include "tty.h"
#include "clist.h"

char	cwaiting;

#define setquote(cp) \
	setbit(((char *)((int)(cp)&~CROUND)+sizeof(struct cblock *)), \
		(int)(cp)&CROUND)
#define isquote(cp) \
	isset(((char *)((int)(cp)&~CROUND)+sizeof(struct cblock *)), \
		(int)(cp)&CROUND)
#define cbptr(x) ((struct cblock *)(x))

/*
 * Initialize clist by freeing all character blocks.
 */
cinit()
{
	register int ccp;
	register struct cblock *cp;

	ccp = (int) cfree;
	ccp = (ccp + CROUND) & ~CROUND;
	for(cp = (struct cblock *) ccp; cp < &cfree[nclist - 1]; cp++) {
		cp->c_next = cfreelist;
		cfreelist = cp;
		cfreecount += CBSIZE;
	}
}

/*
 * Character list get/put
 */
getc(p)
	register struct clist *p;
{
	register struct cblock *bp;
	register int c, s;

	s = spltty();
	if (p->c_cc <= 0) {
		c = -1;
		p->c_cc = 0;
		p->c_cf = p->c_cl = NULL;
	} else {
		c = *p->c_cf & 0377;
		if (isquote(p->c_cf))
			c |= TTY_QUOTE;
		p->c_cf++;
		if (--p->c_cc<=0) {
			bp = cbptr(p->c_cf-1);
			bp = cbptr((int)bp & ~CROUND);
			p->c_cf = NULL;
			p->c_cl = NULL;
			bp->c_next = cfreelist;
			cfreelist = bp;
			cfreecount += CBSIZE;
			if (cwaiting) {
				wakeup(&cwaiting);
				cwaiting = 0;
			}
		} else if (((int)p->c_cf & CROUND) == 0){
			bp = cbptr(p->c_cf);
			bp--;
			p->c_cf = bp->c_next->c_info;
			bp->c_next = cfreelist;
			cfreelist = bp;
			cfreecount += CBSIZE;
			if (cwaiting) {
				wakeup(&cwaiting);
				cwaiting = 0;
			}
		}
	}
	splx(s);
	return (c);
}

/*
 * copy clist to buffer.
 * return number of bytes moved.
 */
q_to_b(q, cp, cc)
	register struct clist *q;
	register char *cp;
	int cc;
{
	register struct cblock *bp;
	register int s, nc;
	char *acp;

	if (cc <= 0)
		return (0);
	s = spltty();
	if (q->c_cc <= 0) {
		q->c_cc = 0;
		q->c_cf = q->c_cl = NULL;
		splx(s);
		return (0);
	}
	acp = cp;

	while (cc) {
		nc = sizeof (struct cblock) - ((int)q->c_cf & CROUND);
		nc = MIN(nc, cc);
		nc = MIN(nc, q->c_cc);
		(void) bcopy(q->c_cf, cp, (unsigned)nc);
		q->c_cf += nc;
		q->c_cc -= nc;
		cc -= nc;
		cp += nc;
		if (q->c_cc <= 0) {
			bp = cbptr(q->c_cf - 1);
			bp = cbptr((int)bp & ~CROUND);
			q->c_cf = q->c_cl = NULL;
			bp->c_next = cfreelist;
			cfreelist = bp;
			cfreecount += CBSIZE;
			if (cwaiting) {
				wakeup(&cwaiting);
				cwaiting = 0;
			}
			break;
		}
		if (((int)q->c_cf & CROUND) == 0) {
			bp = cbptr(q->c_cf);
			bp--;
			q->c_cf = bp->c_next->c_info;
			bp->c_next = cfreelist;
			cfreelist = bp;
			cfreecount += CBSIZE;
			if (cwaiting) {
				wakeup(&cwaiting);
				cwaiting = 0;
			}
		}
	}
	splx(s);
	return (cp-acp);
}

/*
 * Return count of contiguous characters
 * in clist starting at q->c_cf.
 * Stop counting if flag&character is non-null.
 */
ndqb(q, flag)
	register struct clist *q;
	int flag;
{
	register int cc, s;

	s = spltty();
	if (q->c_cc <= 0) {
		cc = -q->c_cc;
		goto out;
	}
	cc = ((int)q->c_cf + CBSIZE) & ~CROUND;
	cc -= (int)q->c_cf;
	if (q->c_cc < cc)
		cc = q->c_cc;
	if (flag) {
		register char *p, *end;

		p = q->c_cf;
		end = p;
		end += cc;
		while (p < end) {
			if (*p & flag) {
				cc = (int)p;
				cc -= (int)q->c_cf;
				break;
			}
			p++;
		}
	}
out:
	splx(s);
	return (cc);
}

/*
 * Flush cc bytes from q.
 */
ndflush(q, cc)
	register struct clist *q;
	register int cc;
{
	register struct cblock *bp;
	char *end;
	int rem, s;

	s = spltty();
	if (q->c_cc <= 0)
		goto out;
	while (cc>0 && q->c_cc) {
		bp = cbptr((int)q->c_cf & ~CROUND);
		if ((int)bp == (((int)q->c_cl-1) & ~CROUND)) {
			end = q->c_cl;
		} else {
			end = (char *)((int)bp + sizeof (struct cblock));
		}
		rem = end - q->c_cf;
		if (cc >= rem) {
			cc -= rem;
			q->c_cc -= rem;
			q->c_cf = bp->c_next->c_info;
			bp->c_next = cfreelist;
			cfreelist = bp;
			cfreecount += CBSIZE;
			if (cwaiting) {
				wakeup(&cwaiting);
				cwaiting = 0;
			}
		} else {
			q->c_cc -= cc;
			q->c_cf += cc;
			if (q->c_cc <= 0) {
				bp->c_next = cfreelist;
				cfreelist = bp;
				cfreecount += CBSIZE;
				if (cwaiting) {
					wakeup(&cwaiting);
					cwaiting = 0;
				}
			}
			break;
		}
	}
	if (q->c_cc <= 0) {
		q->c_cf = q->c_cl = NULL;
		q->c_cc = 0;
	}
out:
	splx(s);
}


putc(c, p)
	int c;
	register struct clist *p;
{
	register struct cblock *bp;
	register char *cp;
	register int s;

	s = spltty();
	if ((cp = p->c_cl) == NULL || p->c_cc < 0 ) {	/* no cblocks yet */
		if ((bp = cfreelist) == NULL) {
			splx(s);
			return (-1);
		}
		cfreelist = bp->c_next;
		cfreecount -= CBSIZE;
		bp->c_next = NULL;
		bzero(bp->c_quote, CBQSIZE);
		p->c_cf = cp = bp->c_info;
	} else if (((int)cp & CROUND) == 0) {
		bp = cbptr(cp) - 1;	/* pointer arith */
		if ((bp->c_next = cfreelist) == NULL) {
			splx(s);
			return (-1);
		}
		bp = bp->c_next;
		cfreelist = bp->c_next;
		cfreecount -= CBSIZE;
		bp->c_next = NULL;
		cp = bp->c_info;
	}
	if (c&TTY_QUOTE)
		setquote(cp);
	*cp++ = c;
	p->c_cc++;
	p->c_cl = cp;
	splx(s);
	return (0);
}

/*
 * copy buffer to clist.
 * return number of bytes not transfered.
 */
b_to_q(cp, cc, q)
	register char *cp;
	struct clist *q;
	register int cc;
{
	register char *cq;
	register struct cblock *bp;
	register int s, nc;
	int acc;

	if (cc <= 0)
		return (0);
	acc = cc;
	s = spltty();
	if ((cq = q->c_cl) == NULL || q->c_cc < 0) {
		if ((bp = cfreelist) == NULL)
			goto out;
		cfreelist = bp->c_next;
		cfreecount -= CBSIZE;
		bzero(bp->c_quote, CBQSIZE);
		bp->c_next = NULL;
		q->c_cf = cq = bp->c_info;
	}

	while (cc) {
		if (((int)cq & CROUND) == 0) {
			bp = cbptr(cq) - 1;
			if ((bp->c_next = cfreelist) == NULL)
				goto out;
			bp = bp->c_next;
			cfreelist = bp->c_next;
			cfreecount -= CBSIZE;
			bzero(bp->c_quote, CBQSIZE);
			bp->c_next = NULL;
			cq = bp->c_info;
		}
		nc = MIN(cc, sizeof (struct cblock) - ((int)cq & CROUND));
		(void) bcopy(cp, cq, (unsigned)nc);
		cp += nc;
		cq += nc;
		cc -= nc;
	}
out:
	q->c_cl = cq;
	q->c_cc += acc - cc;
	splx(s);
	return (cc);
}

/*
 * Given a non-NULL pointter into the list (like c_cf which
 * always points to a real character if non-NULL) return the pointer
 * to the next character in the list or return NULL if no more chars.
 *
 * Callers must not allow getc's to happen between nextc's so that the
 * pointer becomes invalid.  Note that interrupts are NOT masked.
 */
char *
nextc(p, cp, c)
	register struct clist *p;
	register char *cp;
	register int *c;
{

	if (p->c_cc && ++cp != p->c_cl) {
		if (((int)cp & CROUND) == 0) {
			cp = (cbptr(cp))[-1].c_next->c_info;
		}
		*c = *cp;
		if (isquote(cp))
			*c |= TTY_QUOTE;
		return (cp);
	}
	return (0);
}

/*
 * Remove the last character in the list and return it.
 */
unputc(p)
	register struct clist *p;
{
	register struct cblock *bp;
	register int c, s;
	struct cblock *obp;

	s = spltty();
	if (p->c_cc <= 0)
		c = -1;
	else {
		c = *--p->c_cl;
		if (isquote(p->c_cl))
			c |= TTY_QUOTE;
		if (--p->c_cc <= 0) {
			bp = cbptr(p->c_cl);
			bp = cbptr((int)bp & ~CROUND);
			p->c_cl = p->c_cf = NULL;
			bp->c_next = cfreelist;
			cfreelist = bp;
			cfreecount += CBSIZE;
		} else if (p->c_cl == (cbptr((int)p->c_cl & ~CROUND))->c_info) {
			p->c_cl = (char *)((int)p->c_cl & ~CROUND);

			bp = cbptr(p->c_cf);
			bp = cbptr((int)bp & ~CROUND);
			while (bp->c_next != cbptr(p->c_cl))
				bp = bp->c_next;
			obp = bp;
			p->c_cl = (char *)(bp + 1);
			bp = bp->c_next;
			bp->c_next = cfreelist;
			cfreelist = bp;
			cfreecount += CBSIZE;
			obp->c_next = NULL;
		}
	}
	splx(s);
	return (c);
}

/*
 * Put the chars in the from que
 * on the end of the to que.
 */
catq(from, to)
	struct clist *from, *to;
{
#ifdef notdef
	char bbuf[CBSIZE*4];
#endif
	register int s, c;

	s = spltty();
	if (to->c_cc == 0) {
		*to = *from;
		from->c_cc = 0;
		from->c_cf = NULL;
		from->c_cl = NULL;
		splx(s);
		return;
	}
	splx(s);
#ifdef notdef
	while (from->c_cc > 0) {
		c = q_to_b(from, bbuf, sizeof bbuf);
		(void) b_to_q(bbuf, c, to);
	}
#endif
	/* XXX - FIX */
	while ((c = getc(from)) >= 0)
		putc(c, to);
}

#ifdef unneeded
/*
 * Integer (short) get/put using clists.
 */
typedef	u_short word_t;

getw(p)
	register struct clist *p;
{
	register int s, c;
	register struct cblock *bp;

	if (p->c_cc <= 1)
		return(-1);
	if (p->c_cc & 01) {
		c = getc(p);
#if BYTE_ORDER == LITTLE_ENDIAN
		return (c | (getc(p)<<8));
#else
		return (getc(p) | (c<<8));
#endif
	}
	s = spltty();
#if BYTE_ORDER == LITTLE_ENDIAN
	c = (((u_char *)p->c_cf)[0] << 8) | ((u_char *)p->c_cf)[1];
#else
	c = (((u_char *)p->c_cf)[1] << 8) | ((u_char *)p->c_cf)[0];
#endif
	p->c_cf += sizeof (word_t);
	p->c_cc -= sizeof (word_t);
	if (p->c_cc <= 0) {
		bp = cbptr(p->c_cf-1);
		bp = cbptr((int)bp & ~CROUND);
		p->c_cf = NULL;
		p->c_cl = NULL;
		bp->c_next = cfreelist;
		cfreelist = bp;
		cfreecount += CBSIZE;
		if (cwaiting) {
			wakeup(&cwaiting);
			cwaiting = 0;
		}
	} else if (((int)p->c_cf & CROUND) == 0) {
		bp = cbptr(p->c_cf);
		bp--;
		p->c_cf = bp->c_next->c_info;
		bp->c_next = cfreelist;
		cfreelist = bp;
		cfreecount += CBSIZE;
		if (cwaiting) {
			wakeup(&cwaiting);
			cwaiting = 0;
		}
	}
	splx(s);
	return (c);
}

putw(c, p)
	register struct clist *p;
	word_t c;
{
	register int s;
	register struct cblock *bp;
	register char *cp;

	s = spltty();
	if (cfreelist==NULL) {
		splx(s);
		return(-1);
	}
	if (p->c_cc & 01) {
#if BYTE_ORDER == LITTLE_ENDIAN
		(void) putc(c, p);
		(void) putc(c>>8, p);
#else
		(void) putc(c>>8, p);
		(void) putc(c, p);
#endif
	} else {
		if ((cp = p->c_cl) == NULL || p->c_cc < 0 ) {
			if ((bp = cfreelist) == NULL) {
				splx(s);
				return (-1);
			}
			cfreelist = bp->c_next;
			cfreecount -= CBSIZE;
			bp->c_next = NULL;
			p->c_cf = cp = bp->c_info;
		} else if (((int)cp & CROUND) == 0) {
			bp = cbptr(cp) - 1;
			if ((bp->c_next = cfreelist) == NULL) {
				splx(s);
				return (-1);
			}
			bp = bp->c_next;
			cfreelist = bp->c_next;
			cfreecount -= CBSIZE;
			bp->c_next = NULL;
			cp = bp->c_info;
		}
#if defined(vax)
		*(word_t *)cp = c;
#else
		((u_char *)cp)[0] = c>>8;
		((u_char *)cp)[1] = c;
#endif
		p->c_cl = cp + sizeof (word_t);
		p->c_cc += sizeof (word_t);
	}
	splx(s);
	return (0);
}
#endif unneeded
Commit	Line	Data
	1	/*-
	2	* Copyright (c) 1982, 1986 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* %sccs.include.proprietary.c%
	6	*
	7	* @(#)tty_subr.c 7.9 (Berkeley) %G%
	8	*/
	9
	10	#include "param.h"
	11	#include "systm.h"
	12	#include "buf.h"
	13	#include "ioctl.h"
	14	#include "proc.h"
	15	#include "tty.h"
	16	#include "clist.h"
	17
	18	char cwaiting;
	19
	20	#define setquote(cp) \
	21	setbit(((char )((int)(cp)&~CROUND)+sizeof(struct cblock )), \
	22	(int)(cp)&CROUND)
	23	#define isquote(cp) \
	24	isset(((char )((int)(cp)&~CROUND)+sizeof(struct cblock )), \
	25	(int)(cp)&CROUND)
	26	#define cbptr(x) ((struct cblock *)(x))
	27
	28	/*
	29	* Initialize clist by freeing all character blocks.
	30	*/
	31	cinit()
	32	{
	33	register int ccp;
	34	register struct cblock *cp;
	35
	36	ccp = (int) cfree;
	37	ccp = (ccp + CROUND) & ~CROUND;
	38	for(cp = (struct cblock *) ccp; cp < &cfree[nclist - 1]; cp++) {
	39	cp->c_next = cfreelist;
	40	cfreelist = cp;
	41	cfreecount += CBSIZE;
	42	}
	43	}
	44
	45	/*
	46	* Character list get/put
	47	*/
	48	getc(p)
	49	register struct clist *p;
	50	{
	51	register struct cblock *bp;
	52	register int c, s;
	53
	54	s = spltty();
	55	if (p->c_cc <= 0) {
	56	c = -1;
	57	p->c_cc = 0;
	58	p->c_cf = p->c_cl = NULL;
	59	} else {
	60	c = *p->c_cf & 0377;
	61	if (isquote(p->c_cf))
	62	c \|= TTY_QUOTE;
	63	p->c_cf++;
	64	if (--p->c_cc<=0) {
	65	bp = cbptr(p->c_cf-1);
	66	bp = cbptr((int)bp & ~CROUND);
	67	p->c_cf = NULL;
	68	p->c_cl = NULL;
	69	bp->c_next = cfreelist;
	70	cfreelist = bp;
	71	cfreecount += CBSIZE;
	72	if (cwaiting) {
	73	wakeup(&cwaiting);
	74	cwaiting = 0;
	75	}
	76	} else if (((int)p->c_cf & CROUND) == 0){
	77	bp = cbptr(p->c_cf);
	78	bp--;
	79	p->c_cf = bp->c_next->c_info;
	80	bp->c_next = cfreelist;
	81	cfreelist = bp;
	82	cfreecount += CBSIZE;
	83	if (cwaiting) {
	84	wakeup(&cwaiting);
	85	cwaiting = 0;
	86	}
	87	}
	88	}
	89	splx(s);
	90	return (c);
	91	}
	92
	93	/*
	94	* copy clist to buffer.
	95	* return number of bytes moved.
	96	*/
	97	q_to_b(q, cp, cc)
	98	register struct clist *q;
	99	register char *cp;
	100	int cc;
	101	{
	102	register struct cblock *bp;
	103	register int s, nc;
	104	char *acp;
	105
	106	if (cc <= 0)
	107	return (0);
	108	s = spltty();
	109	if (q->c_cc <= 0) {
	110	q->c_cc = 0;
	111	q->c_cf = q->c_cl = NULL;
	112	splx(s);
	113	return (0);
	114	}
	115	acp = cp;
	116
	117	while (cc) {
	118	nc = sizeof (struct cblock) - ((int)q->c_cf & CROUND);
	119	nc = MIN(nc, cc);
	120	nc = MIN(nc, q->c_cc);
	121	(void) bcopy(q->c_cf, cp, (unsigned)nc);
	122	q->c_cf += nc;
	123	q->c_cc -= nc;
	124	cc -= nc;
	125	cp += nc;
	126	if (q->c_cc <= 0) {
	127	bp = cbptr(q->c_cf - 1);
	128	bp = cbptr((int)bp & ~CROUND);
	129	q->c_cf = q->c_cl = NULL;
	130	bp->c_next = cfreelist;
	131	cfreelist = bp;
	132	cfreecount += CBSIZE;
	133	if (cwaiting) {
	134	wakeup(&cwaiting);
	135	cwaiting = 0;
	136	}
	137	break;
	138	}
	139	if (((int)q->c_cf & CROUND) == 0) {
	140	bp = cbptr(q->c_cf);
	141	bp--;
	142	q->c_cf = bp->c_next->c_info;
	143	bp->c_next = cfreelist;
	144	cfreelist = bp;
	145	cfreecount += CBSIZE;
	146	if (cwaiting) {
	147	wakeup(&cwaiting);
	148	cwaiting = 0;
	149	}
	150	}
	151	}
	152	splx(s);
	153	return (cp-acp);
	154	}
	155
	156	/*
	157	* Return count of contiguous characters
	158	* in clist starting at q->c_cf.
	159	* Stop counting if flag&character is non-null.
	160	*/
	161	ndqb(q, flag)
	162	register struct clist *q;
	163	int flag;
	164	{
	165	register int cc, s;
	166
	167	s = spltty();
	168	if (q->c_cc <= 0) {
	169	cc = -q->c_cc;
	170	goto out;
	171	}
	172	cc = ((int)q->c_cf + CBSIZE) & ~CROUND;
	173	cc -= (int)q->c_cf;
	174	if (q->c_cc < cc)
	175	cc = q->c_cc;
	176	if (flag) {
	177	register char p, end;
	178
	179	p = q->c_cf;
	180	end = p;
	181	end += cc;
	182	while (p < end) {
	183	if (*p & flag) {
	184	cc = (int)p;
	185	cc -= (int)q->c_cf;
	186	break;
	187	}
	188	p++;
	189	}
	190	}
	191	out:
	192	splx(s);
	193	return (cc);
	194	}
	195
	196	/*
	197	* Flush cc bytes from q.
	198	*/
	199	ndflush(q, cc)
	200	register struct clist *q;
	201	register int cc;
	202	{
	203	register struct cblock *bp;
	204	char *end;
	205	int rem, s;
	206
	207	s = spltty();
	208	if (q->c_cc <= 0)
	209	goto out;
	210	while (cc>0 && q->c_cc) {
	211	bp = cbptr((int)q->c_cf & ~CROUND);
	212	if ((int)bp == (((int)q->c_cl-1) & ~CROUND)) {
	213	end = q->c_cl;
	214	} else {
	215	end = (char *)((int)bp + sizeof (struct cblock));
	216	}
	217	rem = end - q->c_cf;
	218	if (cc >= rem) {
	219	cc -= rem;
	220	q->c_cc -= rem;
	221	q->c_cf = bp->c_next->c_info;
	222	bp->c_next = cfreelist;
	223	cfreelist = bp;
	224	cfreecount += CBSIZE;
	225	if (cwaiting) {
	226	wakeup(&cwaiting);
	227	cwaiting = 0;
	228	}
	229	} else {
	230	q->c_cc -= cc;
	231	q->c_cf += cc;
	232	if (q->c_cc <= 0) {
	233	bp->c_next = cfreelist;
	234	cfreelist = bp;
	235	cfreecount += CBSIZE;
	236	if (cwaiting) {
	237	wakeup(&cwaiting);
	238	cwaiting = 0;
	239	}
	240	}
	241	break;
	242	}
	243	}
	244	if (q->c_cc <= 0) {
	245	q->c_cf = q->c_cl = NULL;
	246	q->c_cc = 0;
	247	}
	248	out:
	249	splx(s);
	250	}
	251
	252
	253	putc(c, p)
	254	int c;
	255	register struct clist *p;
	256	{
	257	register struct cblock *bp;
	258	register char *cp;
	259	register int s;
	260
	261	s = spltty();
	262	if ((cp = p->c_cl) == NULL \|\| p->c_cc < 0 ) { /* no cblocks yet */
	263	if ((bp = cfreelist) == NULL) {
	264	splx(s);
	265	return (-1);
	266	}
	267	cfreelist = bp->c_next;
	268	cfreecount -= CBSIZE;
	269	bp->c_next = NULL;
	270	bzero(bp->c_quote, CBQSIZE);
	271	p->c_cf = cp = bp->c_info;
	272	} else if (((int)cp & CROUND) == 0) {
	273	bp = cbptr(cp) - 1; /* pointer arith */
	274	if ((bp->c_next = cfreelist) == NULL) {
	275	splx(s);
	276	return (-1);
	277	}
	278	bp = bp->c_next;
	279	cfreelist = bp->c_next;
	280	cfreecount -= CBSIZE;
	281	bp->c_next = NULL;
	282	cp = bp->c_info;
	283	}
	284	if (c&TTY_QUOTE)
	285	setquote(cp);
	286	*cp++ = c;
	287	p->c_cc++;
	288	p->c_cl = cp;
	289	splx(s);
	290	return (0);
	291	}
	292
	293	/*
	294	* copy buffer to clist.
	295	* return number of bytes not transfered.
	296	*/
	297	b_to_q(cp, cc, q)
	298	register char *cp;
	299	struct clist *q;
	300	register int cc;
	301	{
	302	register char *cq;
	303	register struct cblock *bp;
	304	register int s, nc;
	305	int acc;
	306
	307	if (cc <= 0)
	308	return (0);
	309	acc = cc;
	310	s = spltty();
	311	if ((cq = q->c_cl) == NULL \|\| q->c_cc < 0) {
	312	if ((bp = cfreelist) == NULL)
	313	goto out;
	314	cfreelist = bp->c_next;
	315	cfreecount -= CBSIZE;
	316	bzero(bp->c_quote, CBQSIZE);
	317	bp->c_next = NULL;
	318	q->c_cf = cq = bp->c_info;
	319	}
	320
	321	while (cc) {
	322	if (((int)cq & CROUND) == 0) {
	323	bp = cbptr(cq) - 1;
	324	if ((bp->c_next = cfreelist) == NULL)
	325	goto out;
	326	bp = bp->c_next;
	327	cfreelist = bp->c_next;
	328	cfreecount -= CBSIZE;
	329	bzero(bp->c_quote, CBQSIZE);
	330	bp->c_next = NULL;
	331	cq = bp->c_info;
	332	}
	333	nc = MIN(cc, sizeof (struct cblock) - ((int)cq & CROUND));
	334	(void) bcopy(cp, cq, (unsigned)nc);
	335	cp += nc;
	336	cq += nc;
	337	cc -= nc;
	338	}
	339	out:
	340	q->c_cl = cq;
	341	q->c_cc += acc - cc;
	342	splx(s);
	343	return (cc);
	344	}
	345
	346	/*
	347	* Given a non-NULL pointter into the list (like c_cf which
	348	* always points to a real character if non-NULL) return the pointer
	349	* to the next character in the list or return NULL if no more chars.
	350	*
	351	* Callers must not allow getc's to happen between nextc's so that the
	352	* pointer becomes invalid. Note that interrupts are NOT masked.
	353	*/
	354	char *
	355	nextc(p, cp, c)
	356	register struct clist *p;
	357	register char *cp;
	358	register int *c;
	359	{
	360
	361	if (p->c_cc && ++cp != p->c_cl) {
	362	if (((int)cp & CROUND) == 0) {
	363	cp = (cbptr(cp))[-1].c_next->c_info;
	364	}
	365	c = cp;
	366	if (isquote(cp))
	367	*c \|= TTY_QUOTE;
	368	return (cp);
	369	}
	370	return (0);
	371	}
	372
	373	/*
	374	* Remove the last character in the list and return it.
	375	*/
	376	unputc(p)
	377	register struct clist *p;
	378	{
	379	register struct cblock *bp;
	380	register int c, s;
	381	struct cblock *obp;
	382
	383	s = spltty();
	384	if (p->c_cc <= 0)
	385	c = -1;
	386	else {
	387	c = *--p->c_cl;
	388	if (isquote(p->c_cl))
	389	c \|= TTY_QUOTE;
	390	if (--p->c_cc <= 0) {
	391	bp = cbptr(p->c_cl);
	392	bp = cbptr((int)bp & ~CROUND);
	393	p->c_cl = p->c_cf = NULL;
	394	bp->c_next = cfreelist;
	395	cfreelist = bp;
	396	cfreecount += CBSIZE;
	397	} else if (p->c_cl == (cbptr((int)p->c_cl & ~CROUND))->c_info) {
	398	p->c_cl = (char *)((int)p->c_cl & ~CROUND);
	399
	400	bp = cbptr(p->c_cf);
	401	bp = cbptr((int)bp & ~CROUND);
	402	while (bp->c_next != cbptr(p->c_cl))
	403	bp = bp->c_next;
	404	obp = bp;
	405	p->c_cl = (char *)(bp + 1);
	406	bp = bp->c_next;
	407	bp->c_next = cfreelist;
	408	cfreelist = bp;
	409	cfreecount += CBSIZE;
	410	obp->c_next = NULL;
	411	}
	412	}
	413	splx(s);
	414	return (c);
	415	}
	416
	417	/*
	418	* Put the chars in the from que
	419	* on the end of the to que.
	420	*/
	421	catq(from, to)
	422	struct clist from, to;
	423	{
	424	#ifdef notdef
	425	char bbuf[CBSIZE*4];
	426	#endif
	427	register int s, c;
	428
	429	s = spltty();
	430	if (to->c_cc == 0) {
	431	to = from;
	432	from->c_cc = 0;
	433	from->c_cf = NULL;
	434	from->c_cl = NULL;
	435	splx(s);
	436	return;
	437	}
	438	splx(s);
	439	#ifdef notdef
	440	while (from->c_cc > 0) {
	441	c = q_to_b(from, bbuf, sizeof bbuf);
	442	(void) b_to_q(bbuf, c, to);
	443	}
	444	#endif
	445	/* XXX - FIX */
	446	while ((c = getc(from)) >= 0)
	447	putc(c, to);
	448	}
	449
	450	#ifdef unneeded
	451	/*
	452	* Integer (short) get/put using clists.
	453	*/
	454	typedef u_short word_t;
	455
	456	getw(p)
	457	register struct clist *p;
	458	{
	459	register int s, c;
	460	register struct cblock *bp;
	461
	462	if (p->c_cc <= 1)
	463	return(-1);
	464	if (p->c_cc & 01) {
	465	c = getc(p);
	466	#if BYTE_ORDER == LITTLE_ENDIAN
	467	return (c \| (getc(p)<<8));
	468	#else
	469	return (getc(p) \| (c<<8));
	470	#endif
	471	}
	472	s = spltty();
	473	#if BYTE_ORDER == LITTLE_ENDIAN
	474	c = (((u_char )p->c_cf)[0] << 8) \| ((u_char )p->c_cf)[1];
	475	#else
	476	c = (((u_char )p->c_cf)[1] << 8) \| ((u_char )p->c_cf)[0];
	477	#endif
	478	p->c_cf += sizeof (word_t);
	479	p->c_cc -= sizeof (word_t);
	480	if (p->c_cc <= 0) {
	481	bp = cbptr(p->c_cf-1);
	482	bp = cbptr((int)bp & ~CROUND);
	483	p->c_cf = NULL;
	484	p->c_cl = NULL;
	485	bp->c_next = cfreelist;
	486	cfreelist = bp;
	487	cfreecount += CBSIZE;
	488	if (cwaiting) {
	489	wakeup(&cwaiting);
	490	cwaiting = 0;
	491	}
	492	} else if (((int)p->c_cf & CROUND) == 0) {
	493	bp = cbptr(p->c_cf);
	494	bp--;
	495	p->c_cf = bp->c_next->c_info;
	496	bp->c_next = cfreelist;
	497	cfreelist = bp;
	498	cfreecount += CBSIZE;
	499	if (cwaiting) {
	500	wakeup(&cwaiting);
	501	cwaiting = 0;
	502	}
	503	}
	504	splx(s);
	505	return (c);
	506	}
	507
	508	putw(c, p)
	509	register struct clist *p;
	510	word_t c;
	511	{
	512	register int s;
	513	register struct cblock *bp;
	514	register char *cp;
	515
	516	s = spltty();
	517	if (cfreelist==NULL) {
	518	splx(s);
	519	return(-1);
	520	}
	521	if (p->c_cc & 01) {
	522	#if BYTE_ORDER == LITTLE_ENDIAN
	523	(void) putc(c, p);
	524	(void) putc(c>>8, p);
	525	#else
	526	(void) putc(c>>8, p);
	527	(void) putc(c, p);
	528	#endif
	529	} else {
	530	if ((cp = p->c_cl) == NULL \|\| p->c_cc < 0 ) {
	531	if ((bp = cfreelist) == NULL) {
	532	splx(s);
	533	return (-1);
	534	}
	535	cfreelist = bp->c_next;
	536	cfreecount -= CBSIZE;
	537	bp->c_next = NULL;
	538	p->c_cf = cp = bp->c_info;
	539	} else if (((int)cp & CROUND) == 0) {
	540	bp = cbptr(cp) - 1;
	541	if ((bp->c_next = cfreelist) == NULL) {
	542	splx(s);
	543	return (-1);
	544	}
	545	bp = bp->c_next;
	546	cfreelist = bp->c_next;
	547	cfreecount -= CBSIZE;
	548	bp->c_next = NULL;
	549	cp = bp->c_info;
	550	}
	551	#if defined(vax)
	552	(word_t )cp = c;
	553	#else
	554	((u_char *)cp)[0] = c>>8;
	555	((u_char *)cp)[1] = c;
	556	#endif
	557	p->c_cl = cp + sizeof (word_t);
	558	p->c_cc += sizeof (word_t);
	559	}
	560	splx(s);
	561	return (0);
	562	}
	563	#endif unneeded