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sortix--sortix/libmaxsi/fddir-sortix.c

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/******************************************************************************
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; }
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;
}