adtools/clib2

/*
 * $Id: stat_lstat.c,v 1.15 2006-11-13 09:25:28 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Neither the name of Olaf Barthel nor the names of contributors
 *     may be used to endorse or promote products derived from this
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
 */

#ifndef _STDLIB_NULL_POINTER_CHECK_H
#include "stdlib_null_pointer_check.h"
#endif /* _STDLIB_NULL_POINTER_CHECK_H */

/****************************************************************************/

#ifndef _STAT_HEADERS_H
#include "stat_headers.h"
#endif /* _STAT_HEADERS_H */

#ifndef _LOCALE_HEADERS_H
#include "locale_headers.h"
#endif /* _LOCALE_HEADERS_H */

#ifndef _TIME_HEADERS_H
#include "time_headers.h"
#endif /* _TIME_HEADERS_H */

/****************************************************************************/

/* The following is not part of the ISO 'C' (1994) standard. */

/****************************************************************************/

int
lstat(const char * path_name, struct stat * st)
{
    #if defined(UNIX_PATH_SEMANTICS)
    struct name_translation_info path_name_nti;
    #endif /* UNIX_PATH_SEMANTICS */
    D_S(struct FileInfoBlock,fib);
    struct FileLock * fl;
    int result = ERROR;
    LONG status;
    BPTR file_lock = ZERO;
    int link_length = -1;

    ENTER();

    SHOWSTRING(path_name);
    SHOWPOINTER(st);

    assert( path_name != NULL && st != NULL );

    if(__check_abort_enabled)
        __check_abort();

    #if defined(CHECK_FOR_NULL_POINTERS)
    {
        if(path_name == NULL || st == NULL)
        {
            SHOWMSG("invalid parameters");

            __set_errno(EFAULT);
            goto out;
        }
    }
    #endif /* CHECK_FOR_NULL_POINTERS */

    #if defined(UNIX_PATH_SEMANTICS)
    {
        if(__unix_path_semantics)
        {
            if(path_name[0] == '\0')
            {
                SHOWMSG("no name given");

                __set_errno(ENOENT);
                goto out;
            }

            if(__translate_unix_to_amiga_path_name(&path_name,&path_name_nti) != 0)
                goto out;

            /* The pseudo root directory is a very special case indeed.
               We make up some pseudo data for it. */
            if(path_name_nti.is_root)
            {
                time_t mtime;

                SHOWMSG("setting up the root directory info");

                memset(st,0,sizeof(*st));

                time(&mtime);

                st->st_mode        = S_IFDIR | S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
                st->st_mtime    = mtime;
                st->st_atime    = mtime;
                st->st_ctime    = mtime;
                st->st_nlink    = 2;
                st->st_blksize    = 512;

                result = OK;

                goto out;
            }
        }
    }
    #endif /* UNIX_PATH_SEMANTICS */

    D(("trying to get a lock on '%s'",path_name));

    PROFILE_OFF();
    file_lock = __lock(path_name,SHARED_LOCK,&link_length,NULL,0);
    PROFILE_ON();

    if(file_lock == ZERO && link_length < 0)
    {
        SHOWMSG("that didn't work");

        __set_errno(__translate_access_io_error_to_errno(IoErr()));
        goto out;
    }

    if(link_length > 0)
    {
        time_t mtime;

        /* Build a dummy stat for the link. */

        SHOWMSG("Creating stat info for link.");

        memset(st,0,sizeof(*st));

        time(&mtime);

        st->st_mode        = S_IFLNK | S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
        st->st_dev        = (dev_t)DeviceProc((STRPTR)path_name);
        st->st_size        = link_length;
        st->st_mtime    = mtime;
        st->st_atime    = mtime;
        st->st_ctime    = mtime;
        st->st_nlink    = 1;
    }
    else
    {
        PROFILE_OFF();
        status = Examine(file_lock,fib);
        PROFILE_ON();

        if(status == DOSFALSE)
        {
            SHOWMSG("couldn't examine it");

            __set_errno(__translate_io_error_to_errno(IoErr()));
            goto out;
        }

        fl = BADDR(file_lock);

        __convert_file_info_to_stat(fl->fl_Task,fib,st);
    }

    result = OK;

 out:

    PROFILE_OFF();
    UnLock(file_lock);
    PROFILE_ON();

    RETURN(result);
    return(result);
}