root / prex-0.9.0 / usr / lib / libc / stdio / fread.c @ 03e9c04a
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. 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. 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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#include <stdio.h> |
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#include <string.h> |
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#include "local.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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FILE *fp; |
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{ |
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size_t resid; |
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char *p;
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int r;
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size_t total; |
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/*
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* The ANSI standard requires a return value of 0 for a count
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* or a size of 0. Peculiarily, it imposes no such requirements
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* on fwrite; it only requires fread to be broken.
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*/
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if ((resid = count * size) == 0) |
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return (0); |
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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 > (size_t)(r = fp->_r)) {
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(void)memcpy((void *)p, (void *)fp->_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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return ((total - resid) / size);
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} |
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} |
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(void)memcpy((void *)p, (void *)fp->_p, resid); |
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fp->_r -= resid; |
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fp->_p += resid; |
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return (count);
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} |