151 lines
3.0 KiB
C
151 lines
3.0 KiB
C
/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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This file is part of LibMaxsi.
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LibMaxsi is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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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 LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
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dir.c
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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 <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <dirent.h>
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DIR* firstdir = NULL;
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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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void dunregister(DIR* dir)
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{
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if ( !(dir->flags & _DIR_REGISTERED) ) { return; }
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if ( !dir->prev ) { firstdir = dir->next; }
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if ( dir->prev ) { dir->prev->next = dir->next; }
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if ( dir->next ) { dir->next->prev = dir->prev; }
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dir->flags &= ~_DIR_REGISTERED;
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}
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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 = 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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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 ) { dir->free_func(dir); }
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return result;
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}
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void rewinddir(DIR* dir)
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{
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if ( dir->rewind_func ) { dir->rewind_func(dir->user); }
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dir->flags &= ~_DIR_EOF;
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}
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int dirfd(DIR* dir)
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{
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if ( !dir->fd_func ) { errno = EBADF; return 0; }
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return dir->fd_func(dir->user);
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}
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void dclearerr(DIR* dir)
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{
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dir->flags &= ~_DIR_ERROR;
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}
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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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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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DIR* dnewdir(void)
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{
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DIR* dir = (DIR*) calloc(sizeof(DIR), 1);
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if ( !dir ) { 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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int dcloseall(void)
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{
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int result = 0;
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while ( firstdir ) { result |= closedir(firstdir); }
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return (result) ? EOF : 0;
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}
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