84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)fread.c 5.4 (Berkeley) 5/4/91";*/
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static char *rcsid = "$Id: fread.c,v 1.1 1994/02/07 22:05:55 proven Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <pthread.h>
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#include <stdio.h>
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#include <string.h>
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size_t
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fread(buf, size, count, fp)
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void *buf;
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size_t size, count;
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register FILE *fp;
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{
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register size_t resid;
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register char *p;
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register int r;
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size_t total;
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if ((resid = count * size) == 0)
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return (count);
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flockfile(fp);
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if (fp->_r < 0)
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fp->_r = 0;
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total = resid;
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p = buf;
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while (resid > (r = fp->_r)) {
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(void) bcopy((void *)fp->_p, (void *)p, (size_t)r);
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fp->_p += r;
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/* fp->_r = 0 ... done in __srefill */
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p += r;
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resid -= r;
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if (__srefill(fp)) {
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/* no more input: return partial result */
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count = (total - resid) / size;
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goto done_fread;
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}
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}
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(void) bcopy((void *)fp->_p, (void *)p, resid);
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fp->_r -= resid;
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fp->_p += resid;
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done_fread:;
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funlockfile(fp);
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return (count);
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}
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