140 lines
3.5 KiB
C
140 lines
3.5 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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fddir-sortix.c
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Handles the file descriptor backend for the DIR* API on Sortix.
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*******************************************************************************/
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/readdirents.h>
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#include <dirent.h>
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typedef struct fddir_sortix_struct
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{
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struct sortix_dirent* dirent;
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struct sortix_dirent* current;
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size_t direntsize;
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int fd;
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} fddir_sortix_t;
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int fddir_sortix_readents(fddir_sortix_t* info)
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{
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if ( !info->dirent )
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{
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// Allocate a buffer of at least sizeof(sortix_dirent).
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info->direntsize = sizeof(struct sortix_dirent) + 4UL;
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info->dirent = malloc(info->direntsize);
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if ( !info->dirent ) { return -1; }
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}
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if ( readdirents(info->fd, info->dirent, info->direntsize) )
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{
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if ( errno != ERANGE ) { return -1; }
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size_t newdirentsize = info->dirent->d_namelen;
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struct sortix_dirent* newdirent = malloc(newdirentsize);
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if ( !newdirent ) { return -1; }
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free(info->dirent);
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info->dirent = newdirent;
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info->direntsize = newdirentsize;
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return fddir_sortix_readents(info);
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}
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return 0;
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}
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int fddir_sortix_read(void* user, struct dirent* dirent, size_t* size)
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{
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fddir_sortix_t* info = (fddir_sortix_t*) user;
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if ( !info->current )
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{
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if ( fddir_sortix_readents(info) ) { return -1; }
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info->current = info->dirent;
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}
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size_t provided = (user) ? *size : 0;
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size_t needed = sizeof(struct dirent) + info->current->d_namelen + 1;
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*size = needed;
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if ( provided < needed ) { return 1; }
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dirent->d_reclen = needed;
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strcpy(dirent->d_name, info->current->d_name);
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info->current = info->current->d_next;
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return 0;
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}
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int fddir_sortix_rewind(void* user)
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{
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fddir_sortix_t* info = (fddir_sortix_t*) user;
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return lseek(info->fd, SEEK_SET, 0);
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}
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int fddir_sortix_fd(void* user)
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{
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fddir_sortix_t* info = (fddir_sortix_t*) user;
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return info->fd;
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}
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int fddir_sortix_close(void* user)
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{
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fddir_sortix_t* info = (fddir_sortix_t*) user;
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int result = close(info->fd);
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free(info->dirent);
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free(info);
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return result;
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}
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DIR* fdopendir(int fd)
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{
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fddir_sortix_t* info = calloc(sizeof(fddir_sortix_t), 1);
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if ( !info ) { return NULL; }
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DIR* dir = dnewdir();
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if ( !dir ) { free(info); return NULL; }
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// TODO: Possibly set O_CLOEXEC on fd, as that's what GNU/Linux does.
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info->fd = fd;
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dir->read_func = fddir_sortix_read;
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dir->rewind_func = fddir_sortix_rewind;
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dir->fd_func = fddir_sortix_fd;
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dir->close_func = fddir_sortix_close;
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dir->user = (void*) info;
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return dir;
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}
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DIR* opendir(const char* path)
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{
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int fd = open(path, O_SEARCH | O_DIRECTORY | O_CLOEXEC);
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if ( fd < 0 ) { return NULL; }
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DIR* dir = fdopendir(fd);
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if ( !dir ) { close(fd); return NULL; }
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return dir;
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}
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