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sortix--sortix/libc/dirent/readdir.cpp

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C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2014.
This file is part of the Sortix C Library.
The Sortix C Library 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.
The Sortix C Library 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 the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
dirent/readdir.cpp
Reads a directory entry from a directory stream into a DIR-specific buffer.
*******************************************************************************/
#include <dirent.h>
#include <DIR.h>
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
extern "C" struct dirent* readdir(DIR* dir)
{
int old_errno = errno;
if ( !dir->read_func )
return dir->flags |= _DIR_ERROR, errno = EBADF, (struct dirent*) NULL;
size_t size = dir->entrysize;
int status;
while ( 0 < (status = dir->read_func(dir->user, dir->entry, &size)) )
{
struct dirent* biggerdir = (struct dirent*) malloc(size);
if ( !biggerdir )
return dir->flags |= _DIR_ERROR, (struct dirent*) NULL;
free(dir->entry);
dir->entry = biggerdir;
dir->entrysize = size;
}
if ( status < 0 )
return dir->flags |= _DIR_ERROR, (struct dirent*) NULL;
dir->flags &= ~_DIR_ERROR;
if ( !dir->entry->d_name[0] )
return dir->flags |= _DIR_EOF, errno = old_errno, (struct dirent*) NULL;
return dir->entry;
}