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#include <AK/Assertions.h>
#include <AK/StdLibExtras.h>
#include <Kernel/Syscall.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
extern "C" {
DIR* opendir(const char* name)
{
int fd = open(name, O_RDONLY | O_DIRECTORY);
if (fd == -1)
return nullptr;
DIR* dirp = (DIR*)malloc(sizeof(DIR));
dirp->fd = fd;
dirp->buffer = nullptr;
dirp->buffer_size = 0;
dirp->nextptr = nullptr;
return dirp;
}
int closedir(DIR* dirp)
{
if (!dirp || dirp->fd == -1)
return -EBADF;
if (dirp->buffer)
free(dirp->buffer);
int rc = close(dirp->fd);
if (rc == 0)
dirp->fd = -1;
free(dirp);
return rc;
}
struct [[gnu::packed]] sys_dirent
{
ino_t ino;
u8 file_type;
size_t namelen;
char name[];
size_t total_size()
{
return sizeof(ino_t) + sizeof(u8) + sizeof(size_t) + sizeof(char) * namelen;
}
};
dirent* readdir(DIR* dirp)
{
if (!dirp)
return nullptr;
if (dirp->fd == -1)
return nullptr;
if (!dirp->buffer) {
struct stat st;
int rc = fstat(dirp->fd, &st);
if (rc < 0)
return nullptr;
size_t size_to_allocate = max(st.st_size, 4096);
dirp->buffer = (char*)malloc(size_to_allocate);
ssize_t nread = syscall(SC_get_dir_entries, dirp->fd, dirp->buffer, size_to_allocate);
dirp->buffer_size = nread;
dirp->nextptr = dirp->buffer;
}
if (dirp->nextptr >= (dirp->buffer + dirp->buffer_size))
return nullptr;
auto* sys_ent = (sys_dirent*)dirp->nextptr;
dirp->cur_ent.d_ino = sys_ent->ino;
dirp->cur_ent.d_type = sys_ent->file_type;
dirp->cur_ent.d_off = 0;
dirp->cur_ent.d_reclen = sys_ent->total_size();
for (size_t i = 0; i < sys_ent->namelen; ++i)
dirp->cur_ent.d_name[i] = sys_ent->name[i];
// FIXME: I think this null termination behavior is not supposed to be here.
dirp->cur_ent.d_name[sys_ent->namelen] = '\0';
dirp->nextptr += sys_ent->total_size();
return &dirp->cur_ent;
}
int dirfd(DIR* dirp)
{
ASSERT(dirp);
return dirp->fd;
}
}
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