adtools/clib2

/*
 * $Id: dirent_readdir.c,v 1.10 2006-09-25 14:51:15 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 _DIRENT_HEADERS_H
#include "dirent_headers.h"
#endif /* _DIRENT_HEADERS_H */

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

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

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

struct dirent *
readdir(DIR * directory_pointer)
{
    struct dirent * result = NULL;
    struct DirectoryHandle * dh;
    BPTR parent_directory = ZERO;

    ENTER();

    SHOWPOINTER(directory_pointer);

    if(__check_abort_enabled)
        __check_abort();

    PROFILE_OFF();

    if(directory_pointer == NULL)
    {
        SHOWMSG("ouch. invalid parameter");

        __set_errno(EBADF);
        goto out;
    }

    dh = (struct DirectoryHandle *)directory_pointer;

    #if defined(UNIX_PATH_SEMANTICS)
    {
        if(__unix_path_semantics && dh->dh_ScanVolumeList)
        {
            SHOWMSG("we are scanning the volume list");

            if(dh->dh_Position == 0)
            {
                SHOWMSG("returning the .");

                dh->dh_Position++;

                dh->dh_DirectoryEntry.d_ino = 0;
                strcpy(dh->dh_DirectoryEntry.d_name,".");

                result = &dh->dh_DirectoryEntry;
            }
            else
            {
                D_S(struct FileInfoBlock,fib);
                D_S(struct bcpl_name,bcpl_name);
                char * name = (char *)bcpl_name->name;
                BPTR dir_lock;

                assert( (((ULONG)name) & 3) == 0 );

                if(dh->dh_VolumeNode == NULL && NOT IsMinListEmpty(&dh->dh_VolumeList))
                    dh->dh_VolumeNode = (struct Node *)dh->dh_VolumeList.mlh_Head;

                strcpy(name,"\1:"); /* BSTR for ":" */

                while(result == NULL && dh->dh_VolumeNode != NULL && dh->dh_VolumeNode->ln_Succ != NULL)
                {
                    if(IsFileSystem(dh->dh_VolumeNode->ln_Name))
                    {
                        struct DevProc * dvp;

                        dvp = GetDeviceProc(dh->dh_VolumeNode->ln_Name,NULL);
                        if(dvp != NULL)
                        {
                            dir_lock = DoPkt(dvp->dvp_Port,ACTION_LOCATE_OBJECT,ZERO,MKBADDR(name),SHARED_LOCK,    0,0);
                            if(dir_lock != ZERO)
                            {
                                if(Examine(dir_lock,fib))
                                {
                                    assert( sizeof(dh->dh_DirectoryEntry.d_name) >= sizeof(fib->fib_FileName) );

                                    strcpy(dh->dh_DirectoryEntry.d_name,fib->fib_FileName);

                                    dh->dh_DirectoryEntry.d_ino = fib->fib_DiskKey;

                                    result = &dh->dh_DirectoryEntry;
                                }

                                UnLock(dir_lock);
                            }

                            FreeDeviceProc(dvp);
                        }
                    }

                    dh->dh_VolumeNode = dh->dh_VolumeNode->ln_Succ;
                }
            }
        }
    }
    #endif /* UNIX_PATH_SEMANTICS */

    if(NOT dh->dh_ScanVolumeList)
    {
        #if defined(UNIX_PATH_SEMANTICS)
        {
            if(__unix_path_semantics)
            {
                if(dh->dh_Position == 0)
                {
                    SHOWMSG("returning .");

                    dh->dh_Position++;

                    dh->dh_DirectoryEntry.d_ino = dh->dh_FileInfo.fib_DiskKey;

                    strcpy(dh->dh_DirectoryEntry.d_name,".");

                    result = &dh->dh_DirectoryEntry;
                }
                else if (dh->dh_Position == 1)
                {
                    D_S(struct FileInfoBlock,fib);

                    dh->dh_Position++;

                    parent_directory = ParentDir(dh->dh_DirLock);
                    if(parent_directory != ZERO)
                    {
                        if(CANNOT Examine(parent_directory,fib))
                        {
                            __set_errno(__translate_io_error_to_errno(IoErr()));
                            goto out;
                        }
                    }
                    else
                    {
                        /* This is the virtual root directory's key. */
                        fib->fib_DiskKey = 0;
                    }

                    SHOWMSG("returning ..");

                    dh->dh_DirectoryEntry.d_ino = fib->fib_DiskKey;

                    strcpy(dh->dh_DirectoryEntry.d_name,"..");

                    result = &dh->dh_DirectoryEntry;
                }
            }
        }
        #endif /* UNIX_PATH_SEMANTICS */

        if(result == NULL)
        {
            assert( (((ULONG)&dh->dh_FileInfo) & 3) == 0 );

            if(ExNext(dh->dh_DirLock,&dh->dh_FileInfo))
            {
                dh->dh_DirectoryEntry.d_ino = dh->dh_FileInfo.fib_DiskKey;

                assert( sizeof(dh->dh_DirectoryEntry.d_name) >= sizeof(dh->dh_FileInfo.fib_FileName) );

                strcpy(dh->dh_DirectoryEntry.d_name,dh->dh_FileInfo.fib_FileName);

                result = &dh->dh_DirectoryEntry;
            }
            else
            {
                if(IoErr() != ERROR_NO_MORE_ENTRIES)
                {
                    SHOWMSG("error scanning directory");

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

                SHOWMSG("that was the end of the line");
            }
        }
    }

    if(result != NULL)
        D(("next entry to return is '%s'",result->d_name));
    else
        SHOWMSG("end of directory reached");

 out:

    UnLock(parent_directory);

    PROFILE_ON();

    RETURN(result);
    return(result);
}