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Annotation of src/lib/libc/stdio/fwrite.c, Revision 1.16

1.16    ! christos    1: /*     $NetBSD: fwrite.c,v 1.15 2003/08/07 16:43:26 agc Exp $  */
1.5       jtc         2:
1.1       cgd         3: /*-
1.5       jtc         4:  * Copyright (c) 1990, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         6:  *
                      7:  * This code is derived from software contributed to Berkeley by
                      8:  * Chris Torek.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
1.15      agc        18:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        19:  *    may be used to endorse or promote products derived from this software
                     20:  *    without specific prior written permission.
                     21:  *
                     22:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     23:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     24:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     25:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     26:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     27:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     28:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     29:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     30:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     31:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     32:  * SUCH DAMAGE.
                     33:  */
                     34:
1.6       christos   35: #include <sys/cdefs.h>
1.1       cgd        36: #if defined(LIBC_SCCS) && !defined(lint)
1.5       jtc        37: #if 0
                     38: static char sccsid[] = "@(#)fwrite.c   8.1 (Berkeley) 6/4/93";
1.6       christos   39: #else
1.16    ! christos   40: __RCSID("$NetBSD: fwrite.c,v 1.15 2003/08/07 16:43:26 agc Exp $");
1.5       jtc        41: #endif
1.1       cgd        42: #endif /* LIBC_SCCS and not lint */
                     43:
1.9       lukem      44: #include <assert.h>
                     45: #include <errno.h>
1.1       cgd        46: #include <stdio.h>
1.14      thorpej    47: #include "reentrant.h"
1.1       cgd        48: #include "local.h"
                     49: #include "fvwrite.h"
                     50:
                     51: /*
                     52:  * Write `count' objects (each size `size') from memory to the given file.
                     53:  * Return the number of whole objects written.
                     54:  */
1.4       jtc        55: size_t
1.1       cgd        56: fwrite(buf, size, count, fp)
                     57:        const void *buf;
                     58:        size_t size, count;
                     59:        FILE *fp;
                     60: {
                     61:        size_t n;
                     62:        struct __suio uio;
                     63:        struct __siov iov;
1.9       lukem      64:
1.13      lukem      65:        _DIAGASSERT(fp != NULL);
                     66:        /*
                     67:         * SUSv2 requires a return value of 0 for a count or a size of 0.
                     68:         */
                     69:        if ((n = count * size) == 0)
                     70:                return (0);
1.9       lukem      71:        _DIAGASSERT(buf != NULL);
1.1       cgd        72:
1.16    ! christos   73:        iov.iov_base = __UNCONST(buf);
1.13      lukem      74:        uio.uio_resid = iov.iov_len = n;
1.1       cgd        75:        uio.uio_iov = &iov;
                     76:        uio.uio_iovcnt = 1;
                     77:
                     78:        /*
                     79:         * The usual case is success (__sfvwrite returns 0);
                     80:         * skip the divide if this happens, since divides are
                     81:         * generally slow and since this occurs whenever size==0.
                     82:         */
1.7       jtc        83:        FLOCKFILE(fp);
                     84:        if (__sfvwrite(fp, &uio) != 0)
                     85:                count = ((n - uio.uio_resid) / size);
                     86:        FUNLOCKFILE(fp);
                     87:        return (count);
1.1       cgd        88: }

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