busybox/libbb/copy_file_chunk.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) tons of folks.  Tracking down who wrote what
 * isn't something I'm going to worry about...  If you wrote something
 * here, please feel free to acknowledge your work.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Based in part on code from sash, Copyright (c) 1999 by David I. Bell 
 * Permission has been granted to redistribute this code under the GPL.
 *
 */

#include <stdio.h>
#include <sys/stat.h>
#include "libbb.h"

/*
 * Copy chunksize bytes between two file descriptors
 */
int copy_file_chunk(int srcfd, int dstfd, off_t chunksize)
{
        off_t size;
        char buffer[BUFSIZ]; /* BUFSIZ is declared in stdio.h */

        while (chunksize > 0) {
                if (chunksize > BUFSIZ)
                        size = BUFSIZ;
                else
                        size = chunksize;
                if (full_write(dstfd, buffer, full_read(srcfd, buffer, size)) < size)
                        return(FALSE);
                chunksize -= size;
        }
        return (TRUE);
}


/* END CODE */
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