library/dirent_opendir.c
/*
* $Id: dirent_opendir.c,v 1.11 2006-01-08 12:04:22 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 _DIRENT_HEADERS_H
#include "dirent_headers.h"
#endif /* _DIRENT_HEADERS_H */
/****************************************************************************/
#ifndef _STDLIB_MEMORY_H
#include "stdlib_memory.h"
#endif /* _STDLIB_MEMORY_H */
/****************************************************************************/
/* The following is not part of the ISO 'C' (1994) standard. */
/****************************************************************************/
#if defined(UNIX_PATH_SEMANTICS)
/****************************************************************************/
STATIC struct Node *
find_by_name(struct List * list,const char * name)
{
struct Node * result = NULL;
struct Node * node;
for(node = list->lh_Head ; node->ln_Succ != NULL ; node = node->ln_Succ)
{
if(strcasecmp(node->ln_Name,name) == 0)
{
result = node;
break;
}
}
return(result);
}
/****************************************************************************/
#endif /* UNIX_PATH_SEMANTICS */
/****************************************************************************/
DIR *
opendir(const char * path_name)
{
#if defined(UNIX_PATH_SEMANTICS)
struct name_translation_info path_name_nti;
#endif /* UNIX_PATH_SEMANTICS */
struct DirectoryHandle * dh = NULL;
DIR * result = NULL;
ENTER();
SHOWSTRING(path_name);
assert( path_name != NULL );
if(__check_abort_enabled)
__check_abort();
#if defined(CHECK_FOR_NULL_POINTERS)
{
if(path_name == NULL)
{
SHOWMSG("invalid parameter");
__set_errno(EFAULT);
goto out;
}
}
#endif /* CHECK_FOR_NULL_POINTERS */
dh = malloc(sizeof(*dh));
if(dh == NULL)
{
SHOWMSG("memory allocation failed");
goto out;
}
memset(dh,0,sizeof(*dh));
#if defined(UNIX_PATH_SEMANTICS)
{
struct Node * node;
NewList((struct List *)&dh->dh_VolumeList);
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;
SHOWSTRING(path_name);
if(path_name_nti.is_root)
{
struct DosList * dol;
UBYTE * name;
SHOWMSG("collecting volume names");
dh->dh_ScanVolumeList = TRUE;
PROFILE_OFF();
dol = LockDosList(LDF_VOLUMES|LDF_READ);
PROFILE_ON();
while((dol = NextDosEntry(dol,LDF_VOLUMES|LDF_READ)) != NULL)
{
name = BADDR(dol->dol_Name);
if(name != NULL && name[0] > 0)
{
size_t len;
len = name[0];
node = malloc(sizeof(*node) + len + 2);
if(node == NULL)
{
UnLockDosList(LDF_VOLUMES|LDF_READ);
__set_errno(ENOMEM);
goto out;
}
node->ln_Name = (char *)(node + 1);
memmove(node->ln_Name,&name[1],len);
node->ln_Name[len++] = ':';
node->ln_Name[len] = '\0';
/* Check if the name is already on the list. Mind you,
this is not the most sophisticated algorithm but then
the number of volumes should be small. */
if(find_by_name((struct List *)&dh->dh_VolumeList,node->ln_Name) != NULL)
{
free(node);
continue;
}
D(("adding '%s'",node->ln_Name));
AddTail((struct List *)&dh->dh_VolumeList,node);
}
}
UnLockDosList(LDF_VOLUMES|LDF_READ);
/* Bail out if we cannot present anything. */
if(IsMinListEmpty(&dh->dh_VolumeList))
{
__set_errno(ENOMEM);
goto out;
}
}
}
}
#endif /* UNIX_PATH_SEMANTICS */
if(NOT dh->dh_ScanVolumeList)
{
LONG status;
SHOWMSG("we are supposed to scan a directory");
SHOWSTRING(path_name);
PROFILE_OFF();
dh->dh_DirLock = Lock((STRPTR)path_name,SHARED_LOCK);
PROFILE_ON();
if(dh->dh_DirLock == ZERO)
{
SHOWMSG("couldn't get a lock on it");
__set_errno(__translate_access_io_error_to_errno(IoErr()));
goto out;
}
assert( (((ULONG)&dh->dh_FileInfo) & 3) == 0 );
PROFILE_OFF();
status = Examine(dh->dh_DirLock,&dh->dh_FileInfo);
PROFILE_ON();
if(status == DOSFALSE)
{
SHOWMSG("couldn't examine it");
__set_errno(__translate_io_error_to_errno(IoErr()));
goto out;
}
if(dh->dh_FileInfo.fib_DirEntryType < 0)
{
SHOWMSG("this isn't a directory");
__set_errno(ENOTDIR);
goto out;
}
}
SHOWMSG("OK, done");
assert( __directory_list.mlh_Head != NULL );
__dirent_lock();
AddTail((struct List *)&__directory_list,(struct Node *)dh);
__dirent_unlock();
result = (DIR *)dh;
dh = NULL;
out:
if(dh != NULL)
{
SHOWMSG("ouch. cleaning up");
#if defined(UNIX_PATH_SEMANTICS)
{
struct Node * node;
while((node = RemHead((struct List *)&dh->dh_VolumeList)) != NULL)
free(node);
}
#endif /* UNIX_PATH_SEMANTICS */
PROFILE_OFF();
UnLock(dh->dh_DirLock);
PROFILE_ON();
free(dh);
}
RETURN(result);
return(result);
}