mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/******************************************************************************
|
|
|
|
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
|
|
|
|
This file is part of LibMaxsi.
|
|
|
|
LibMaxsi 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.
|
|
|
|
LibMaxsi 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 LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
fddir-sortix.c
|
|
Handles the file descriptor backend for the DIR* API on Sortix.
|
|
|
|
******************************************************************************/
|
|
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <sys/readdirents.h>
|
|
#include <dirent.h>
|
|
|
|
typedef struct fddir_sortix_struct
|
|
{
|
|
struct sortix_dirent* dirent;
|
|
struct sortix_dirent* current;
|
|
size_t direntsize;
|
|
int fd;
|
|
} fddir_sortix_t;
|
|
|
|
int fddir_sortix_readents(fddir_sortix_t* info)
|
|
{
|
|
if ( !info->dirent )
|
|
{
|
|
// Allocate a buffer of at least sizeof(sortix_dirent).
|
|
info->direntsize = sizeof(struct sortix_dirent) + 4UL;
|
|
info->dirent = malloc(info->direntsize);
|
|
if ( !info->dirent ) { return -1; }
|
|
}
|
|
|
|
if ( readdirents(info->fd, info->dirent, info->direntsize) )
|
|
{
|
|
if ( errno != ERANGE ) { return -1; }
|
|
size_t newdirentsize = info->dirent->d_namelen;
|
|
struct sortix_dirent* newdirent = malloc(newdirentsize);
|
|
if ( !newdirent ) { return -1; }
|
|
free(info->dirent);
|
|
info->dirent = newdirent;
|
|
info->direntsize = newdirentsize;
|
|
return fddir_sortix_readents(info);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fddir_sortix_read(void* user, struct dirent* dirent, size_t* size)
|
|
{
|
|
fddir_sortix_t* info = (fddir_sortix_t*) user;
|
|
if ( !info->current )
|
|
{
|
|
if ( fddir_sortix_readents(info) ) { return -1; }
|
|
info->current = info->dirent;
|
|
}
|
|
|
|
size_t provided = (user) ? *size : 0;
|
|
size_t needed = sizeof(struct dirent) + info->current->d_namelen + 1;
|
|
*size = needed;
|
|
if ( provided < needed ) { return 1; }
|
|
|
|
dirent->d_reclen = needed;
|
|
strcpy(dirent->d_name, info->current->d_name);
|
|
|
|
info->current = info->current->d_next;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fddir_sortix_rewind(void* user)
|
|
{
|
|
fddir_sortix_t* info = (fddir_sortix_t*) user;
|
|
return lseek(info->fd, SEEK_SET, 0);
|
|
}
|
|
|
|
int fddir_sortix_fd(void* user)
|
|
{
|
|
fddir_sortix_t* info = (fddir_sortix_t*) user;
|
|
return info->fd;
|
|
}
|
|
|
|
int fddir_sortix_close(void* user)
|
|
{
|
|
fddir_sortix_t* info = (fddir_sortix_t*) user;
|
|
int result = close(info->fd);
|
|
free(info->dirent);
|
|
free(info);
|
|
return result;
|
|
}
|
|
|
|
DIR* fdopendir(int fd)
|
|
{
|
|
fddir_sortix_t* info = calloc(sizeof(fddir_sortix_t), 1);
|
|
if ( !info ) { return NULL; }
|
|
|
|
DIR* dir = dnewdir();
|
|
if ( !dir ) { free(info); return NULL; }
|
|
|
|
// TODO: Possibly set O_CLOEXEC on fd, as that's what GNU/Linux does.
|
|
|
|
info->fd = fd;
|
|
|
|
dir->read_func = fddir_sortix_read;
|
|
dir->rewind_func = fddir_sortix_rewind;
|
|
dir->fd_func = fddir_sortix_fd;
|
|
dir->close_func = fddir_sortix_close;
|
|
dir->user = (void*) info;
|
|
|
|
return dir;
|
|
}
|
|
|
|
DIR* opendir(const char* path)
|
|
{
|
|
// TODO: POSIX says we should use O_CLOEXEC here. That seems quite hacky to
|
|
// me. Is that stupid? If so, I'll leave it out.
|
|
int fd = open(path, O_SEARCH | O_DIRECTORY);
|
|
if ( fd < 0 ) { return NULL; }
|
|
DIR* dir = fdopendir(fd);
|
|
if ( !dir ) { close(fd); return NULL; }
|
|
return dir;
|
|
}
|
|
|