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