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#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <bits/ensure.h>
#include <frg/allocation.hpp>
#include <mlibc/allocator.hpp>
#include <mlibc/posix-sysdeps.hpp>
#include <mlibc/debug.hpp>
// Code taken from musl
int alphasort(const struct dirent **a, const struct dirent **b) {
return strcoll((*a)->d_name, (*b)->d_name);
}
int closedir(DIR *dir) {
// TODO: Deallocate the dir structure.
close(dir->__handle);
return 0;
}
int dirfd(DIR *dir) {
return dir->__handle;
}
DIR *fdopendir(int fd) {
struct stat st;
if(fstat(fd, &st) < 0) {
return nullptr;
}
// Musl implements this, but O_PATH is only declared on the linux abi
/*if(fcntl(fd, F_GETFL) & O_PATH) {
errno = EBADF;
return nullptr;
}*/
if(!S_ISDIR(st.st_mode)) {
errno = ENOTDIR;
return nullptr;
}
auto dir = frg::construct<__mlibc_dir_struct>(getAllocator());
__ensure(dir);
dir->__ent_next = 0;
dir->__ent_limit = 0;
int flags = fcntl(fd, F_GETFD);
fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
dir->__handle = fd;
return dir;
}
DIR *opendir(const char *path) {
auto dir = frg::construct<__mlibc_dir_struct>(getAllocator());
__ensure(dir);
dir->__ent_next = 0;
dir->__ent_limit = 0;
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_open_dir, nullptr);
if(int e = mlibc::sys_open_dir(path, &dir->__handle); e) {
errno = e;
frg::destruct(getAllocator(), dir);
return nullptr;
}else{
return dir;
}
}
struct dirent *readdir(DIR *dir) {
__ensure(dir->__ent_next <= dir->__ent_limit);
if(dir->__ent_next == dir->__ent_limit) {
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_read_entries, nullptr);
if(int e = mlibc::sys_read_entries(dir->__handle, dir->__ent_buffer, 2048, &dir->__ent_limit); e)
__ensure(!"mlibc::sys_read_entries() failed");
dir->__ent_next = 0;
if(!dir->__ent_limit)
return nullptr;
}
auto entp = reinterpret_cast<struct dirent *>(dir->__ent_buffer + dir->__ent_next);
// We only copy as many bytes as we need to avoid buffer-overflows.
memcpy(&dir->__current, entp, offsetof(struct dirent, d_name) + strlen(entp->d_name) + 1);
dir->__ent_next += entp->d_reclen;
return &dir->__current;
}
int readdir_r(DIR *dir, struct dirent *entry, struct dirent **result) {
if(!mlibc::sys_read_entries) {
MLIBC_MISSING_SYSDEP();
return ENOSYS;
}
__ensure(dir->__ent_next <= dir->__ent_limit);
if(dir->__ent_next == dir->__ent_limit) {
if(int e = mlibc::sys_read_entries(dir->__handle, dir->__ent_buffer, 2048, &dir->__ent_limit); e)
__ensure(!"mlibc::sys_read_entries() failed");
dir->__ent_next = 0;
if(!dir->__ent_limit) {
*result = NULL;
return 0;
}
}
auto entp = reinterpret_cast<struct dirent *>(dir->__ent_buffer + dir->__ent_next);
// We only copy as many bytes as we need to avoid buffer-overflows.
memcpy(entry, entp, offsetof(struct dirent, d_name) + strlen(entp->d_name) + 1);
dir->__ent_next += entp->d_reclen;
*result = entry;
return 0;
}
void rewinddir(DIR *dir) {
lseek(dir->__handle, 0, SEEK_SET);
dir->__ent_next = 0;
}
int scandir(const char *path, struct dirent ***res, int (*select)(const struct dirent *),
int (*compare)(const struct dirent **, const struct dirent **)) {
DIR *dir = opendir(path);
if (!dir)
return -1; // errno will be set by opendir()
// we should save the errno
int old_errno = errno;
errno = 0;
struct dirent *dir_ent;
struct dirent **array = nullptr, **tmp = nullptr;
int length = 0;
int count = 0;
while((dir_ent = readdir(dir)) && !errno) {
if(select && !select(dir_ent))
continue;
if(count >= length) {
length = 2*length + 1;
tmp = static_cast<struct dirent**>(realloc(array,
length * sizeof(struct dirent*)));
// we need to check the call actually goes through
// before we overwrite array so that we can
// deallocate the already written entries should realloc()
// have failed
if(!tmp)
break;
array = tmp;
}
array[count] = static_cast<struct dirent*>(malloc(dir_ent->d_reclen));
if(!array[count])
break;
memcpy(array[count], dir_ent, dir_ent->d_reclen);
count++;
}
if(errno) {
if(array)
while(count-- > 0)
free(array[count]);
free(array);
return -1;
}
// from here we can set the old errno back
errno = old_errno;
if(compare)
qsort(array, count, sizeof(struct dirent*),
(int (*)(const void *, const void *)) compare);
*res = array;
return count;
}
void seekdir(DIR *, long) {
__ensure(!"Not implemented");
__builtin_unreachable();
}
long telldir(DIR *) {
__ensure(!"Not implemented");
__builtin_unreachable();
}
int versionsort(const struct dirent **a, const struct dirent **b) {
return strverscmp((*a)->d_name, (*b)->d_name);
}
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