mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/*-
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Chris Torek.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)fread.c 8.2 (Berkeley) 12/11/93";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "namespace.h"
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include "un-namespace.h"
|
|
#include "local.h"
|
|
#include "libc_private.h"
|
|
|
|
size_t
|
|
fread(buf, size, count, fp)
|
|
void * __restrict buf;
|
|
size_t size, count;
|
|
FILE * __restrict fp;
|
|
{
|
|
size_t resid;
|
|
char *p;
|
|
int r;
|
|
size_t total;
|
|
|
|
/*
|
|
* The ANSI standard requires a return value of 0 for a count
|
|
* or a size of 0. Peculiarily, it imposes no such requirements
|
|
* on fwrite; it only requires fread to be broken.
|
|
*/
|
|
if ((resid = count * size) == 0)
|
|
return (0);
|
|
FLOCKFILE(fp);
|
|
ORIENT(fp, -1);
|
|
if (fp->_r < 0)
|
|
fp->_r = 0;
|
|
total = resid;
|
|
p = buf;
|
|
while (resid > (r = fp->_r)) {
|
|
(void)memcpy((void *)p, (void *)fp->_p, (size_t)r);
|
|
fp->_p += r;
|
|
/* fp->_r = 0 ... done in __srefill */
|
|
p += r;
|
|
resid -= r;
|
|
if (__srefill(fp)) {
|
|
/* no more input: return partial result */
|
|
FUNLOCKFILE(fp);
|
|
return ((total - resid) / size);
|
|
}
|
|
}
|
|
(void)memcpy((void *)p, (void *)fp->_p, resid);
|
|
fp->_r -= resid;
|
|
fp->_p += resid;
|
|
FUNLOCKFILE(fp);
|
|
return (count);
|
|
}
|