freebsd-dev/usr.bin/window/ttoutput.c

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/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Edward Wang at The University of California, Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)ttoutput.c 8.1 (Berkeley) 6/6/93";
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static char rcsid[] =
"$FreeBSD$";
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#endif /* not lint */
#include "ww.h"
#include "tt.h"
#include <errno.h>
#include <unistd.h>
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/*
* Buffered output package.
* We need this because stdio fails on non-blocking writes.
*/
ttflush()
{
register char *p;
register n = tt_obp - tt_ob;
if (n == 0)
return;
if (tt.tt_checksum)
(*tt.tt_checksum)(tt_ob, n);
if (tt.tt_flush) {
(*tt.tt_flush)();
return;
}
wwnflush++;
for (p = tt_ob; p < tt_obp;) {
wwnwr++;
n = write(STDOUT_FILENO, p, tt_obp - p);
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if (n < 0) {
wwnwre++;
if (errno != EWOULDBLOCK) {
/* can't deal with this */
p = tt_obp;
}
} else if (n == 0) {
/* what to do? */
wwnwrz++;
} else {
wwnwrc += n;
p += n;
}
}
tt_obp = tt_ob;
}
ttputs(s)
register char *s;
{
while (*s)
ttputc(*s++);
}
ttwrite(s, n)
register char *s;
register n;
{
switch (n) {
case 0:
break;
case 1:
ttputc(*s);
break;
case 2:
if (tt_obe - tt_obp < 2)
ttflush();
*tt_obp++ = *s++;
*tt_obp++ = *s;
break;
case 3:
if (tt_obe - tt_obp < 3)
ttflush();
*tt_obp++ = *s++;
*tt_obp++ = *s++;
*tt_obp++ = *s;
break;
case 4:
if (tt_obe - tt_obp < 4)
ttflush();
*tt_obp++ = *s++;
*tt_obp++ = *s++;
*tt_obp++ = *s++;
*tt_obp++ = *s;
break;
case 5:
if (tt_obe - tt_obp < 5)
ttflush();
*tt_obp++ = *s++;
*tt_obp++ = *s++;
*tt_obp++ = *s++;
*tt_obp++ = *s++;
*tt_obp++ = *s;
break;
default:
while (n > 0) {
register m;
while ((m = tt_obe - tt_obp) == 0)
ttflush();
if ((m = tt_obe - tt_obp) > n)
m = n;
bcopy(s, tt_obp, m);
tt_obp += m;
s += m;
n -= m;
}
}
}