Colony » Colony Scout

/*-

 * Copyright (c) 1990, 1993

 *        The Regents of the University of California.  All rights reserved.

 *

 * This code is derived from software contributed to Berkeley by

 * Chris Torek.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include <sys/types.h>

#include <fcntl.h>

#include <unistd.h>

#include <stdio.h>

#include <errno.h>

#include "local.h"

FILE *

fdopen(fd, mode)

        int fd;

        const char *mode;

{

        FILE *fp;

        int flags, oflags, fdflags, tmp;

        if ((flags = __sflags(mode, &oflags)) == 0)

                return (NULL);

        /* Make sure the mode the user wants is a subset of the actual mode. */

        if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)

                return (NULL);

        tmp = fdflags & O_ACCMODE;

        if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {

                errno = EINVAL;

                return (NULL);

        }

        if ((fp = __sfp()) == NULL)

                return (NULL);

        fp->_flags = flags;

        /*

         * If opened for appending, but underlying descriptor does not have

         * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to

         * end before each write.

         */

        if ((oflags & O_APPEND) && !(fdflags & O_APPEND))

                fp->_flags |= __SAPP;

        fp->_file = fd;

        return (fp);

}