port/stdio/_endopen.c

	_endopen.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */


/*
 *  This routine is a special case, in that it is aware of
 *  both small and large file interfaces. It must be built
 *  in the small compilation environment.
 */

#include <sys/feature_tests.h>

#define close       _close
#define lseek       _lseek
#define open        _open
#if !defined(_LP64)
#define lseek64     _lseek64
#define open64      _open64
#endif

#include "lint.h"
#include "file64.h"
#include <mtlib.h>
#include <sys/types.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include <thread.h>
#include <synch.h>
#include "stdiom.h"
#include <errno.h>

/*
 * open UNIX file name, associate with iop
 */

FILE *
_endopen(const char *name, const char *type, FILE *iop, int largefile)
{
    int oflag, fd;
    char plus;
    rmutex_t *lk;

    if (iop == NULL)
        return (NULL);
    switch (type[0]) {
    default:
        errno = EINVAL;
        return (NULL);
    case 'r':
        oflag = O_RDONLY;
        break;
    case 'w':
        oflag = O_WRONLY | O_TRUNC | O_CREAT;
        break;
    case 'a':
        oflag = O_WRONLY | O_APPEND | O_CREAT;
        break;
    }
    /* UNIX ignores 'b' and treats text and binary the same */
    if ((plus = type[1]) == 'b')
        plus = type[2];
    if (plus == '+')
        oflag = (oflag & ~(O_RDONLY | O_WRONLY)) | O_RDWR;

    /* select small or large file open based on flag */
    if (largefile) {
        fd = open64(name, oflag, 0666);
    } else {
        fd = open(name, oflag, 0666);
    }
    if (fd < 0)
        return (NULL);

#ifdef  _LP64
    iop->_file = fd;
#else
    if (fd > UCHAR_MAX) {
        (void) close(fd);
        errno = EMFILE;
        return (NULL);
    }
    iop->_file = (unsigned char)fd; /* assume fits in unsigned char */
#endif  /*  _LP64   */

    FLOCKFILE(lk, iop);     /* this lock may be unnecessary */

#ifdef  _LP64
    iop->_flag &= ~0377;    /* clear lower 8-bits */
    if (plus == '+')
        iop->_flag |= _IORW;
    else if (type[0] == 'r')
        iop->_flag |= _IOREAD;
    else
        iop->_flag |= _IOWRT;
#else
    if (plus == '+')
        iop->_flag = _IORW;
    else if (type[0] == 'r')
        iop->_flag = _IOREAD;
    else
        iop->_flag = _IOWRT;
#endif  /*  _LP64   */
    FUNLOCKFILE(lk);
    if (oflag == (O_WRONLY | O_APPEND | O_CREAT)) { /* type == "a" */
        if (lseek64(fd, (off64_t)0, SEEK_END) < (off64_t)0) {
            (void) close(fd);
            return (NULL);
        }
    }

    return (iop);
}