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Annotation of prex-old/usr/lib/libc/stdio/fdopen.c, Revision 1.1.1.1

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: }