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sortix--sortix/libc/dirent/dir.cpp

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2012-09-28 18:36:46 -04:00
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
dirent/dir.cpp
DIR* is an interface allowing various directory backends.
2012-09-28 18:36:46 -04:00
*******************************************************************************/
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
static DIR* firstdir = NULL;
void dregister(DIR* dir)
{
dir->flags |= _DIR_REGISTERED;
if ( !firstdir ) { firstdir = dir; return; }
dir->next = firstdir;
firstdir->prev = dir;
firstdir = dir;
}
void dunregister(DIR* dir)
{
if ( !(dir->flags & _DIR_REGISTERED) )
return;
if ( !dir->prev )
firstdir = dir->next;
if ( dir->prev )
dir->prev->next = dir->next;
if ( dir->next )
dir->next->prev = dir->prev;
dir->flags &= ~_DIR_REGISTERED;
}
struct dirent* readdir(DIR* dir)
{
if ( !dir->read_func )
{
dir->flags |= _DIR_ERROR;
errno = EBADF;
return 0;
}
size_t size = dir->entrysize;
int status = dir->read_func(dir->user, dir->entry, &size);
if ( status < 0 )
{
dir->flags |= _DIR_ERROR;
return NULL;
}
if ( 0 < status )
{
struct dirent* biggerdir = (struct dirent*) malloc(size);
if ( !biggerdir )
{
dir->flags |= _DIR_ERROR;
return NULL;
}
free(dir->entry);
dir->entry = biggerdir;
dir->entrysize = size;
return readdir(dir);
}
dir->flags &= ~_DIR_ERROR;
if ( !dir->entry->d_name[0] )
{
dir->flags |= _DIR_EOF;
return NULL;
}
return dir->entry;
}
int closedir(DIR* dir)
{
int result = (dir->close_func) ? dir->close_func(dir->user) : 0;
dunregister(dir);
free(dir->entry);
if ( dir->free_func )
dir->free_func(dir);
return result;
}
void rewinddir(DIR* dir)
{
if ( dir->rewind_func )
dir->rewind_func(dir->user);
dir->flags &= ~_DIR_EOF;
}
int dirfd(DIR* dir)
{
if ( !dir->fd_func )
return errno = EBADF, 0;
return dir->fd_func(dir->user);
}
void dclearerr(DIR* dir)
{
dir->flags &= ~_DIR_ERROR;
}
int derror(DIR* dir)
{
return dir->flags & _DIR_ERROR;
}
int deof(DIR* dir)
{
return dir->flags & _DIR_EOF;
}
static void dfreedir(DIR* dir)
{
free(dir);
}
DIR* dnewdir(void)
{
DIR* dir = (DIR*) calloc(sizeof(DIR), 1);
if ( !dir )
return NULL;
dir->flags = 0;
dir->free_func = dfreedir;
dregister(dir);
return dir;
}
int dcloseall(void)
{
int result = 0;
while ( firstdir )
result |= closedir(firstdir);
return result ? EOF : 0;
}