[unix-history] / usr / src / sys / kern / tty_subr.c

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)tty_subr.c	7.5 (Berkeley) %G%
 */

#include "param.h"
#include "systm.h"
#include "buf.h"
#include "ioctl.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))

/*
 * 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;
{
	register struct cblock *bp;
	register int s;
	register 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;
{
	register cc;
	int 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 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)
	register struct clist *p;
{
	register struct cblock *bp;
	register char *cp;
	register 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 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 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 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
da7c5cc6	1	/*
0880b18e	2	* Copyright (c) 1982, 1986 Regents of the University of California.
da7c5cc6 KM	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*
75d5a0b0	6	* @(#)tty_subr.c 7.5 (Berkeley) %G%
da7c5cc6	7	*/
8f6119af	8
94368568 JB	9	#include "param.h"
94368568 JB	10	#include "systm.h"
94368568	11	#include "buf.h"
3358b36b	12	#include "ioctl.h"
94368568 JB	13	#include "tty.h"
94368568 JB	14	#include "clist.h"
11bd398c	15
48575cec	16	char cwaiting;
11bd398c	17
e39f9ea6 MT	18	#define setquote(cp) \
	19	setbit(((char )((int)(cp)&~CROUND)+sizeof(struct cblock )), \
	20	(int)(cp)&CROUND)
	21	#define isquote(cp) \
	22	isset(((char )((int)(cp)&~CROUND)+sizeof(struct cblock )), \
	23	(int)(cp)&CROUND)
	24	#define cbptr(x) ((struct cblock *)(x))
	25
11bd398c BJ	26	/*
	27	* Character list get/put
	28	*/
	29	getc(p)
88a7a62a	30	register struct clist *p;
11bd398c BJ	31	{
	32	register struct cblock *bp;
	33	register int c, s;
	34
a8170d5d	35	s = spltty();
11bd398c BJ	36	if (p->c_cc <= 0) {
	37	c = -1;
	38	p->c_cc = 0;
	39	p->c_cf = p->c_cl = NULL;
	40	} else {
e39f9ea6 MT	41	c = *p->c_cf & 0377;
	42	if (isquote(p->c_cf))
	43	c \|= TTY_QUOTE;
	44	p->c_cf++;
11bd398c	45	if (--p->c_cc<=0) {
e39f9ea6 MT	46	bp = cbptr(p->c_cf-1);
e39f9ea6 MT	47	bp = cbptr((int)bp & ~CROUND);
11bd398c BJ	48	p->c_cf = NULL;
	49	p->c_cl = NULL;
	50	bp->c_next = cfreelist;
	51	cfreelist = bp;
48575cec BJ	52	cfreecount += CBSIZE;
	53	if (cwaiting) {
	54	wakeup(&cwaiting);
	55	cwaiting = 0;
	56	}
11bd398c	57	} else if (((int)p->c_cf & CROUND) == 0){
e39f9ea6	58	bp = cbptr(p->c_cf);
11bd398c BJ	59	bp--;
	60	p->c_cf = bp->c_next->c_info;
	61	bp->c_next = cfreelist;
	62	cfreelist = bp;
48575cec BJ	63	cfreecount += CBSIZE;
	64	if (cwaiting) {
	65	wakeup(&cwaiting);
	66	cwaiting = 0;
	67	}
11bd398c BJ	68	}
	69	}
	70	splx(s);
01b0e233	71	return (c);
11bd398c BJ	72	}
	73
	74	/*
	75	* copy clist to buffer.
	76	* return number of bytes moved.
	77	*/
	78	q_to_b(q, cp, cc)
961945a8 SL	79	register struct clist *q;
961945a8 SL	80	register char *cp;
11bd398c BJ	81	{
	82	register struct cblock *bp;
	83	register int s;
a8170d5d	84	register nc;
11bd398c BJ	85	char *acp;
	86
	87	if (cc <= 0)
01b0e233	88	return (0);
a8170d5d	89	s = spltty();
11bd398c BJ	90	if (q->c_cc <= 0) {
	91	q->c_cc = 0;
	92	q->c_cf = q->c_cl = NULL;
48575cec	93	splx(s);
01b0e233	94	return (0);
11bd398c BJ	95	}
11bd398c BJ	96	acp = cp;
11bd398c	97
a8170d5d	98	while (cc) {
01b0e233	99	nc = sizeof (struct cblock) - ((int)q->c_cf & CROUND);
a8170d5d MK	100	nc = MIN(nc, cc);
	101	nc = MIN(nc, q->c_cc);
	102	(void) bcopy(q->c_cf, cp, (unsigned)nc);
	103	q->c_cf += nc;
	104	q->c_cc -= nc;
	105	cc -= nc;
	106	cp += nc;
	107	if (q->c_cc <= 0) {
e39f9ea6 MT	108	bp = cbptr(q->c_cf - 1);
e39f9ea6 MT	109	bp = cbptr((int)bp & ~CROUND);
11bd398c BJ	110	q->c_cf = q->c_cl = NULL;
	111	bp->c_next = cfreelist;
	112	cfreelist = bp;
48575cec BJ	113	cfreecount += CBSIZE;
	114	if (cwaiting) {
	115	wakeup(&cwaiting);
	116	cwaiting = 0;
	117	}
11bd398c BJ	118	break;
	119	}
	120	if (((int)q->c_cf & CROUND) == 0) {
e39f9ea6	121	bp = cbptr(q->c_cf);
11bd398c BJ	122	bp--;
	123	q->c_cf = bp->c_next->c_info;
	124	bp->c_next = cfreelist;
	125	cfreelist = bp;
48575cec BJ	126	cfreecount += CBSIZE;
	127	if (cwaiting) {
	128	wakeup(&cwaiting);
	129	cwaiting = 0;
	130	}
11bd398c BJ	131	}
	132	}
	133	splx(s);
01b0e233	134	return (cp-acp);
11bd398c BJ	135	}
11bd398c BJ	136
11bd398c BJ	137	/*
	138	* Return count of contiguous characters
	139	* in clist starting at q->c_cf.
	140	* Stop counting if flag&character is non-null.
	141	*/
	142	ndqb(q, flag)
961945a8	143	register struct clist *q;
11bd398c	144	{
961945a8 SL	145	register cc;
961945a8 SL	146	int s;
11bd398c	147
a8170d5d	148	s = spltty();
11bd398c BJ	149	if (q->c_cc <= 0) {
	150	cc = -q->c_cc;
	151	goto out;
	152	}
	153	cc = ((int)q->c_cf + CBSIZE) & ~CROUND;
	154	cc -= (int)q->c_cf;
	155	if (q->c_cc < cc)
	156	cc = q->c_cc;
	157	if (flag) {
	158	register char p, end;
	159
	160	p = q->c_cf;
	161	end = p;
	162	end += cc;
	163	while (p < end) {
	164	if (*p & flag) {
48575cec BJ	165	cc = (int)p;
48575cec BJ	166	cc -= (int)q->c_cf;
11bd398c BJ	167	break;
	168	}
	169	p++;
	170	}
	171	}
	172	out:
	173	splx(s);
01b0e233	174	return (cc);
11bd398c BJ	175	}
11bd398c BJ	176
11bd398c	177	/*
48575cec	178	* Flush cc bytes from q.
11bd398c BJ	179	*/
11bd398c BJ	180	ndflush(q, cc)
88a7a62a SL	181	register struct clist *q;
88a7a62a SL	182	register cc;
11bd398c	183	{
88a7a62a SL	184	register struct cblock *bp;
	185	char *end;
	186	int rem, s;
11bd398c	187
a8170d5d	188	s = spltty();
01b0e233	189	if (q->c_cc <= 0)
11bd398c	190	goto out;
48575cec	191	while (cc>0 && q->c_cc) {
e39f9ea6	192	bp = cbptr((int)q->c_cf & ~CROUND);
48575cec BJ	193	if ((int)bp == (((int)q->c_cl-1) & ~CROUND)) {
	194	end = q->c_cl;
	195	} else {
	196	end = (char *)((int)bp + sizeof (struct cblock));
	197	}
	198	rem = end - q->c_cf;
	199	if (cc >= rem) {
	200	cc -= rem;
	201	q->c_cc -= rem;
11bd398c	202	q->c_cf = bp->c_next->c_info;
48575cec BJ	203	bp->c_next = cfreelist;
	204	cfreelist = bp;
	205	cfreecount += CBSIZE;
	206	if (cwaiting) {
	207	wakeup(&cwaiting);
	208	cwaiting = 0;
	209	}
11bd398c	210	} else {
48575cec BJ	211	q->c_cc -= cc;
	212	q->c_cf += cc;
	213	if (q->c_cc <= 0) {
	214	bp->c_next = cfreelist;
	215	cfreelist = bp;
	216	cfreecount += CBSIZE;
	217	if (cwaiting) {
	218	wakeup(&cwaiting);
	219	cwaiting = 0;
	220	}
	221	}
	222	break;
11bd398c	223	}
48575cec BJ	224	}
48575cec BJ	225	if (q->c_cc <= 0) {
11bd398c	226	q->c_cf = q->c_cl = NULL;
48575cec	227	q->c_cc = 0;
11bd398c BJ	228	}
	229	out:
	230	splx(s);
	231	}
b8f09f36	232
48575cec	233
11bd398c	234	putc(c, p)
88a7a62a	235	register struct clist *p;
11bd398c BJ	236	{
	237	register struct cblock *bp;
	238	register char *cp;
	239	register s;
	240
a8170d5d	241	s = spltty();
e39f9ea6	242	if ((cp = p->c_cl) == NULL \|\| p->c_cc < 0 ) { /* no cblocks yet */
11bd398c BJ	243	if ((bp = cfreelist) == NULL) {
11bd398c BJ	244	splx(s);
01b0e233	245	return (-1);
11bd398c BJ	246	}
11bd398c BJ	247	cfreelist = bp->c_next;
48575cec	248	cfreecount -= CBSIZE;
11bd398c	249	bp->c_next = NULL;
e39f9ea6	250	bzero(bp->c_quote, CBQSIZE);
11bd398c BJ	251	p->c_cf = cp = bp->c_info;
11bd398c BJ	252	} else if (((int)cp & CROUND) == 0) {
e39f9ea6	253	bp = cbptr(cp) - 1; /* pointer arith */
11bd398c BJ	254	if ((bp->c_next = cfreelist) == NULL) {
11bd398c BJ	255	splx(s);
01b0e233	256	return (-1);
11bd398c BJ	257	}
	258	bp = bp->c_next;
	259	cfreelist = bp->c_next;
48575cec	260	cfreecount -= CBSIZE;
11bd398c BJ	261	bp->c_next = NULL;
	262	cp = bp->c_info;
	263	}
e39f9ea6 MT	264	if (c&TTY_QUOTE)
e39f9ea6 MT	265	setquote(cp);
11bd398c BJ	266	*cp++ = c;
	267	p->c_cc++;
	268	p->c_cl = cp;
	269	splx(s);
01b0e233	270	return (0);
11bd398c BJ	271	}
11bd398c BJ	272
11bd398c BJ	273	/*
	274	* copy buffer to clist.
	275	* return number of bytes not transfered.
	276	*/
	277	b_to_q(cp, cc, q)
88a7a62a SL	278	register char *cp;
	279	struct clist *q;
	280	register int cc;
11bd398c BJ	281	{
	282	register char *cq;
	283	register struct cblock *bp;
a8170d5d MK	284	register s, nc;
a8170d5d MK	285	int acc;
11bd398c BJ	286
11bd398c BJ	287	if (cc <= 0)
01b0e233	288	return (0);
a8170d5d MK	289	acc = cc;
	290	s = spltty();
	291	if ((cq = q->c_cl) == NULL \|\| q->c_cc < 0) {
	292	if ((bp = cfreelist) == NULL)
	293	goto out;
	294	cfreelist = bp->c_next;
	295	cfreecount -= CBSIZE;
e39f9ea6	296	bzero(bp->c_quote, CBQSIZE);
a8170d5d MK	297	bp->c_next = NULL;
	298	q->c_cf = cq = bp->c_info;
	299	}
	300
	301	while (cc) {
11bd398c	302	if (((int)cq & CROUND) == 0) {
e39f9ea6	303	bp = cbptr(cq) - 1;
a8170d5d MK	304	if ((bp->c_next = cfreelist) == NULL)
a8170d5d MK	305	goto out;
11bd398c BJ	306	bp = bp->c_next;
11bd398c BJ	307	cfreelist = bp->c_next;
48575cec	308	cfreecount -= CBSIZE;
e39f9ea6	309	bzero(bp->c_quote, CBQSIZE);
11bd398c	310	bp->c_next = NULL;
a8170d5d	311	cq = bp->c_info;
11bd398c	312	}
01b0e233	313	nc = MIN(cc, sizeof (struct cblock) - ((int)cq & CROUND));
a8170d5d MK	314	(void) bcopy(cp, cq, (unsigned)nc);
	315	cp += nc;
	316	cq += nc;
	317	cc -= nc;
11bd398c	318	}
a8170d5d MK	319	out:
	320	q->c_cl = cq;
	321	q->c_cc += acc - cc;
	322	splx(s);
42cc3b3d	323	return (cc);
11bd398c BJ	324	}
11bd398c BJ	325
b8f09f36 BJ	326	/*
	327	* Given a non-NULL pointter into the list (like c_cf which
	328	* always points to a real character if non-NULL) return the pointer
	329	* to the next character in the list or return NULL if no more chars.
	330	*
	331	* Callers must not allow getc's to happen between nextc's so that the
	332	* pointer becomes invalid. Note that interrupts are NOT masked.
	333	*/
	334	char *
e39f9ea6	335	nextc(p, cp, c)
88a7a62a SL	336	register struct clist *p;
88a7a62a SL	337	register char *cp;
e39f9ea6	338	register int *c;
b8f09f36 BJ	339	{
	340
	341	if (p->c_cc && ++cp != p->c_cl) {
e39f9ea6 MT	342	if (((int)cp & CROUND) == 0) {
	343	cp = (cbptr(cp))[-1].c_next->c_info;
	344	}
	345	c = cp;
	346	if (isquote(cp))
	347	*c \|= TTY_QUOTE;
b8f09f36 BJ	348	return (cp);
	349	}
	350	return (0);
	351	}
	352
	353	/*
	354	* Remove the last character in the list and return it.
	355	*/
	356	unputc(p)
88a7a62a	357	register struct clist *p;
b8f09f36 BJ	358	{
	359	register struct cblock *bp;
	360	register int c, s;
	361	struct cblock *obp;
	362
a8170d5d	363	s = spltty();
b8f09f36 BJ	364	if (p->c_cc <= 0)
	365	c = -1;
	366	else {
	367	c = *--p->c_cl;
e39f9ea6 MT	368	if (isquote(p->c_cl))
e39f9ea6 MT	369	c \|= TTY_QUOTE;
b8f09f36	370	if (--p->c_cc <= 0) {
e39f9ea6 MT	371	bp = cbptr(p->c_cl);
e39f9ea6 MT	372	bp = cbptr((int)bp & ~CROUND);
b8f09f36 BJ	373	p->c_cl = p->c_cf = NULL;
	374	bp->c_next = cfreelist;
	375	cfreelist = bp;
48575cec	376	cfreecount += CBSIZE;
e39f9ea6	377	} else if (p->c_cl == (cbptr((int)p->c_cl & ~CROUND))->c_info) {
b8f09f36	378	p->c_cl = (char *)((int)p->c_cl & ~CROUND);
e39f9ea6 MT	379
	380	bp = cbptr(p->c_cf);
	381	bp = cbptr((int)bp & ~CROUND);
	382	while (bp->c_next != cbptr(p->c_cl))
b8f09f36 BJ	383	bp = bp->c_next;
	384	obp = bp;
	385	p->c_cl = (char *)(bp + 1);
	386	bp = bp->c_next;
	387	bp->c_next = cfreelist;
	388	cfreelist = bp;
48575cec	389	cfreecount += CBSIZE;
b8f09f36 BJ	390	obp->c_next = NULL;
	391	}
	392	}
	393	splx(s);
	394	return (c);
	395	}
	396
	397	/*
	398	* Put the chars in the from que
	399	* on the end of the to que.
b8f09f36 BJ	400	*/
b8f09f36 BJ	401	catq(from, to)
88a7a62a	402	struct clist from, to;
b8f09f36	403	{
e39f9ea6	404	#ifdef notdef
a8170d5d	405	char bbuf[CBSIZE*4];
e39f9ea6	406	#endif
a8170d5d MK	407	register s, c;
	408
	409	s = spltty();
	410	if (to->c_cc == 0) {
	411	to = from;
	412	from->c_cc = 0;
	413	from->c_cf = NULL;
	414	from->c_cl = NULL;
	415	splx(s);
	416	return;
	417	}
	418	splx(s);
e39f9ea6	419	#ifdef notdef
a8170d5d MK	420	while (from->c_cc > 0) {
	421	c = q_to_b(from, bbuf, sizeof bbuf);
	422	(void) b_to_q(bbuf, c, to);
	423	}
e39f9ea6 MT	424	#endif
	425	/* XXX - FIX */
	426	while ((c = getc(from)) >= 0)
	427	putc(c, to);
b8f09f36 BJ	428	}
b8f09f36 BJ	429
a8170d5d	430	#ifdef unneeded
11bd398c	431	/*
01b0e233	432	* Integer (short) get/put using clists.
11bd398c	433	*/
a8170d5d	434	typedef u_short word_t;
961945a8	435
11bd398c	436	getw(p)
d0b37068	437	register struct clist *p;
11bd398c	438	{
a8170d5d MK	439	register int s, c;
	440	register struct cblock *bp;
	441
	442	if (p->c_cc <= 1)
	443	return(-1);
	444	if (p->c_cc & 01) {
	445	c = getc(p);
c6d44403	446	#if BYTE_ORDER == LITTLE_ENDIAN
01b0e233 MK	447	return (c \| (getc(p)<<8));
	448	#else
	449	return (getc(p) \| (c<<8));
	450	#endif
a8170d5d MK	451	}
a8170d5d MK	452	s = spltty();
e39f9ea6	453	#if BYTE_ORDER == LITTLE_ENDIAN
fb1db32c	454	c = (((u_char )p->c_cf)[0] << 8) \| ((u_char )p->c_cf)[1];
01b0e233 MK	455	#else
	456	c = (((u_char )p->c_cf)[1] << 8) \| ((u_char )p->c_cf)[0];
	457	#endif
	458	p->c_cf += sizeof (word_t);
	459	p->c_cc -= sizeof (word_t);
a8170d5d	460	if (p->c_cc <= 0) {
e39f9ea6 MT	461	bp = cbptr(p->c_cf-1);
e39f9ea6 MT	462	bp = cbptr((int)bp & ~CROUND);
a8170d5d MK	463	p->c_cf = NULL;
	464	p->c_cl = NULL;
	465	bp->c_next = cfreelist;
	466	cfreelist = bp;
	467	cfreecount += CBSIZE;
	468	if (cwaiting) {
	469	wakeup(&cwaiting);
	470	cwaiting = 0;
	471	}
	472	} else if (((int)p->c_cf & CROUND) == 0) {
e39f9ea6	473	bp = cbptr(p->c_cf);
a8170d5d MK	474	bp--;
	475	p->c_cf = bp->c_next->c_info;
	476	bp->c_next = cfreelist;
	477	cfreelist = bp;
	478	cfreecount += CBSIZE;
	479	if (cwaiting) {
	480	wakeup(&cwaiting);
	481	cwaiting = 0;
	482	}
	483	}
	484	splx(s);
	485	return (c);
11bd398c	486	}
48575cec	487
11bd398c	488	putw(c, p)
d0b37068	489	register struct clist *p;
a8170d5d	490	word_t c;
11bd398c BJ	491	{
11bd398c BJ	492	register s;
a8170d5d MK	493	register struct cblock *bp;
a8170d5d MK	494	register char *cp;
11bd398c	495
a8170d5d	496	s = spltty();
11bd398c BJ	497	if (cfreelist==NULL) {
	498	splx(s);
	499	return(-1);
	500	}
a8170d5d	501	if (p->c_cc & 01) {
c6d44403	502	#if BYTE_ORDER == LITTLE_ENDIAN
a8170d5d MK	503	(void) putc(c, p);
a8170d5d MK	504	(void) putc(c>>8, p);
01b0e233 MK	505	#else
	506	(void) putc(c>>8, p);
	507	(void) putc(c, p);
	508	#endif
a8170d5d MK	509	} else {
	510	if ((cp = p->c_cl) == NULL \|\| p->c_cc < 0 ) {
	511	if ((bp = cfreelist) == NULL) {
	512	splx(s);
	513	return (-1);
	514	}
	515	cfreelist = bp->c_next;
	516	cfreecount -= CBSIZE;
	517	bp->c_next = NULL;
	518	p->c_cf = cp = bp->c_info;
	519	} else if (((int)cp & CROUND) == 0) {
e39f9ea6	520	bp = cbptr(cp) - 1;
a8170d5d MK	521	if ((bp->c_next = cfreelist) == NULL) {
	522	splx(s);
	523	return (-1);
	524	}
	525	bp = bp->c_next;
	526	cfreelist = bp->c_next;
	527	cfreecount -= CBSIZE;
	528	bp->c_next = NULL;
	529	cp = bp->c_info;
	530	}
01b0e233	531	#if defined(vax)
a8170d5d	532	(word_t )cp = c;
01b0e233 MK	533	#else
	534	((u_char *)cp)[0] = c>>8;
	535	((u_char *)cp)[1] = c;
	536	#endif
	537	p->c_cl = cp + sizeof (word_t);
	538	p->c_cc += sizeof (word_t);
a8170d5d	539	}
11bd398c	540	splx(s);
961945a8	541	return (0);
11bd398c	542	}
a8170d5d	543	#endif unneeded