ttywrite.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 160 行

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1.2
date	97.09.21.19.30.23;	author dls;	state Dist;
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next	1.1;

1.1
date	94.05.08.06.01.42;	author dls;	state Old;
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1.2
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@pre-3e code
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@/* ttywrite.c - ttywrite */

#include <conf.h>
#include <kernel.h>
#include <tty.h>

/*------------------------------------------------------------------------
 * ttywrite - write a buffer to a tty
 *------------------------------------------------------------------------
 */
int
ttywrite(pdev, buf, len)
struct devsw	*pdev;
unsigned char	*buf;
int		len;
{
	struct devsw	*phw;
	struct tty	*ptty = (struct tty *)pdev->dvioblk;
	int		i;

	if (ptty == 0)
		return SYSERR;
	phw = ptty->tty_phw;
	if (phw == 0)
		return SYSERR;
	if (phw->dvputc == 0)
		return SYSERR;
	for (i=0; i<len; ++i) {
		if (ptty->tty_oflags & TOF_RAW) {
			if (phw->dvputc(phw, buf[i]) != OK)
				break;
		}
		/* else, do cooked output */
		if ( buf[i] > 127) {
			(phw->dvputc)(phw, 'M');
			(phw->dvputc)(phw, '-');
			(phw->dvputc)(phw, buf[i] & 0x7f);
			continue;
		}
#ifdef notdef
		if (buf[i] == '\n')
			(phw->dvputc)(phw, '\r');
#endif
		(phw->dvputc)(phw, buf[i]);
	}
	return i;
}
@


1.1
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@Initial revision
@
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@d1 1
a1 1
/* ttywrite.c - ttywrite, writcopy */
a5 4
#include <io.h>
#include <slu.h>

extern char *foob3;
d8 1
a8 1
 *  ttywrite - write one or more characters to a tty device
d11 5
a15 4
ttywrite(devptr, buff, count)
struct	devsw	*devptr;
char	*buff;
int	count;
d17 28
a44 17
	STATWORD ps;    
	register struct tty *ttyp;
	int ncopied;

	if (count < 0)
		return(SYSERR);
	if (count == 0)
		return(OK);
	disable(ps);
	ttyp = &tty[devptr->dvminor];
#ifdef UNDEF
	count -= (ncopied = writcopy(buff, ttyp, count));
	buff += ncopied;
#endif	
	for ( ; count>0 ; count--) {
		/**foob3++ = *buff;*/
		ttyputc(devptr, *buff++);
d46 1
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	restore(ps);
	return(OK);
}

/*------------------------------------------------------------------------
 *  writcopy - high-speed copy from user's buffer into system buffer
 *------------------------------------------------------------------------
 */
LOCAL writcopy(buff, ttyp, count)
char	*buff;
struct	tty *ttyp;
int	count;
{
	register int	avail;
	register char	*cp, *qhead, *qend, *uend;

	avail = OBUFLEN - ttyp->ocnt;
	qhead = &ttyp->obuff[ttyp->ohead];
	qend  = &ttyp->obuff[OBUFLEN];
	cp    = buff;
	uend  = buff + count;
	while (avail-- > 1 && cp < uend) {
		if (*cp == NEWLINE && ttyp->ocrlf) {
			*qhead++ = RETURN;
			--avail;
			if ( qhead >= qend )
				qhead = ttyp->obuff;
		}
		*qhead++ = *cp++;
		if ( qhead >= qend )
			qhead = ttyp->obuff;
	}					/* avail decremented one*/
	ttyp->ohead = qhead - ttyp->obuff;	/* extra time when loop	*/
	ttyp->ocnt = OBUFLEN - (avail+1);
	sreset(ttyp->osem, ++avail);		/* condition fails.	*/
	ttyostart(ttyp);
	return(cp - buff);
@