usr/src/lib/libmail/common/copystream.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 /*
  33  *  NAME
  34  *      copystream - copy one FILE stream to another
  35  *
  36  *  SYNOPSIS
  37  *      int copystream(FILE *infp, FILE *outfp)
  38  *
  39  *  DESCRIPTION
  40  *      copystream() copies one stream to another. The stream
  41  *      infp must be opened for reading and the stream outfp
  42  *      must be opened for writing.
  43  *
  44  *      It returns true if the stream is successively copied;
  45  *      false if any writes fail.
  46  */
  47
  48 #include "libmail.h"
  49 #include <sys/types.h>
  50
  51 int
  52 copystream(FILE *infp, FILE *outfp)
  53 {
  54         char buffer[BUFSIZ];
  55         size_t nread;
  56
  57         while ((nread = fread(buffer, sizeof (char), sizeof (buffer),
  58             infp)) > 0)
  59                 if (fwrite(buffer, sizeof (char), nread, outfp) != nread)
  60                         return (0);
  61         return (1);
  62 }