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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1989 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 3.6 */
/*LINTLIBRARY*/
/*
* This version writes directly to the buffer rather than looping on putc.
* Ptr args aren't checked for NULL because the program would be a
* catastrophic mess anyway. Better to abort than just to return NULL.
*
* This version does buffered writes larger than BUFSIZ directly, when
* the buffer is empty.
*/
#include <stdio.h>
#include "stdiom.h"
#define MIN(x, y) (x < y ? x : y)
extern char *memcpy();
int
fwrite(ptr, size, count, iop)
char *ptr;
int size, count;
register FILE *iop;
{
register unsigned nleft;
register int n;
register unsigned char *cptr, *bufend;
register unsigned char *prev_ptr;
if (size <= 0 || count <= 0 || _WRTCHK(iop))
return (0);
bufend = iop->_base + iop->_bufsiz;
nleft = count*size;
/* if the file is unbuffered, or if the iop->ptr = iop->base, and there
is > BUFSZ chars to write, we can do a direct write */
prev_ptr = iop->_ptr;
if (iop->_base >= iop->_ptr) { /*this covers the unbuffered case, too*/
if (((iop->_flag & _IONBF) != 0) || (nleft >= BUFSIZ)) {
if ((n=write(fileno(iop),ptr,nleft)) != nleft)
{
iop->_flag |= _IOERR;
n = (n >= 0) ? n : 0;
}
return n/size;
}
}
/* Put characters in the buffer */
/* note that the meaning of n when just starting this loop is
irrelevant. It is defined in the loop */
for (; ; ptr += n) {
while ((n = bufend - (cptr = iop->_ptr)) <= 0) /* full buf */
if (_xflsbuf(iop) == EOF)
return (count - (nleft + size - 1)/size);
n = MIN(nleft, n);
(void) memcpy((char *) cptr, ptr, n);
iop->_cnt -= n;
iop->_ptr += n;
_BUFSYNC(iop);
/* done; flush if linebuffered with a newline */
if ((nleft -= n) == 0) {
if (iop->_flag & (_IOLBF | _IONBF)) {
if ((iop->_flag & _IONBF) || (memchr(prev_ptr,
'\n',iop->_ptr - prev_ptr) != NULL)) {
(void) _xflsbuf(iop);
}
}
return (count);
}
}
}
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