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Annotation of prex-old/usr/lib/libc/stdio/fread.c, Revision 1.1

1.1     ! nbrk        1: /*-
        !             2:  * Copyright (c) 1990, 1993
        !             3:  *     The Regents of the University of California.  All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Chris Torek.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. Neither the name of the University nor the names of its contributors
        !            17:  *    may be used to endorse or promote products derived from this software
        !            18:  *    without specific prior written permission.
        !            19:  *
        !            20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            30:  * SUCH DAMAGE.
        !            31:  */
        !            32:
        !            33: #include <stdio.h>
        !            34: #include <string.h>
        !            35: #include "local.h"
        !            36:
        !            37: size_t
        !            38: fread(buf, size, count, fp)
        !            39:        void *buf;
        !            40:        size_t size, count;
        !            41:        FILE *fp;
        !            42: {
        !            43:        size_t resid;
        !            44:        char *p;
        !            45:        int r;
        !            46:        size_t total;
        !            47:
        !            48:        /*
        !            49:         * The ANSI standard requires a return value of 0 for a count
        !            50:         * or a size of 0.  Peculiarily, it imposes no such requirements
        !            51:         * on fwrite; it only requires fread to be broken.
        !            52:         */
        !            53:        if ((resid = count * size) == 0)
        !            54:                return (0);
        !            55:        if (fp->_r < 0)
        !            56:                fp->_r = 0;
        !            57:        total = resid;
        !            58:        p = buf;
        !            59:        while (resid > (size_t)(r = fp->_r)) {
        !            60:                (void)memcpy((void *)p, (void *)fp->_p, (size_t)r);
        !            61:                fp->_p += r;
        !            62:                /* fp->_r = 0 ... done in __srefill */
        !            63:                p += r;
        !            64:                resid -= r;
        !            65:                if (__srefill(fp)) {
        !            66:                        /* no more input: return partial result */
        !            67:                        return ((total - resid) / size);
        !            68:                }
        !            69:        }
        !            70:        (void)memcpy((void *)p, (void *)fp->_p, resid);
        !            71:        fp->_r -= resid;
        !            72:        fp->_p += resid;
        !            73:        return (count);
        !            74: }