Return to fdopen.c CVS log

Up to [local] / prex-old / usr / lib / libc / stdio

Annotation of prex-old/usr/lib/libc/stdio/fdopen.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 <sys/types.h>
        !            34: #include <fcntl.h>
        !            35: #include <unistd.h>
        !            36: #include <stdio.h>
        !            37: #include <errno.h>
        !            38: #include "local.h"
        !            39:
        !            40: FILE *
        !            41: fdopen(fd, mode)
        !            42:        int fd;
        !            43:        const char *mode;
        !            44: {
        !            45:        FILE *fp;
        !            46:        int flags, oflags, fdflags, tmp;
        !            47:
        !            48:        if ((flags = __sflags(mode, &oflags)) == 0)
        !            49:                return (NULL);
        !            50:
        !            51:        /* Make sure the mode the user wants is a subset of the actual mode. */
        !            52:        if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
        !            53:                return (NULL);
        !            54:        tmp = fdflags & O_ACCMODE;
        !            55:        if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
        !            56:                errno = EINVAL;
        !            57:                return (NULL);
        !            58:        }
        !            59:
        !            60:        if ((fp = __sfp()) == NULL)
        !            61:                return (NULL);
        !            62:        fp->_flags = flags;
        !            63:        /*
        !            64:         * If opened for appending, but underlying descriptor does not have
        !            65:         * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
        !            66:         * end before each write.
        !            67:         */
        !            68:        if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
        !            69:                fp->_flags |= __SAPP;
        !            70:        fp->_file = fd;
        !            71:        return (fp);
        !            72: }