#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)readdir.c 8.3 (Berkeley) 9/29/94";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <sys/param.h>
#include <dirent.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "telldir.h"
struct dirent *
_readdir_unlocked(DIR *dirp, int skip)
{
struct dirent *dp;
long initial_seek;
long initial_loc = 0;
for (;;) {
if (dirp->dd_loc >= dirp->dd_size) {
if (dirp->dd_flags & (__DTF_READALL | __DTF_ATEND))
return (NULL);
initial_loc = dirp->dd_loc;
dirp->dd_flags &= ~__DTF_SKIPREAD;
dirp->dd_loc = 0;
}
if (dirp->dd_loc == 0 &&
!(dirp->dd_flags & (__DTF_READALL | __DTF_ATEND | __DTF_SKIPREAD))) {
if (dirp->dd_len == READDIR_INITIAL_SIZE) {
int len = READDIR_LARGE_SIZE;
char *buf = malloc(len);
if (buf) {
free(dirp->dd_buf);
dirp->dd_buf = buf;
dirp->dd_len = len;
}
}
#if __DARWIN_64_BIT_INO_T
getdirentries64_flags_t *gdeflags =
(getdirentries64_flags_t *)(dirp->dd_buf + dirp->dd_len -
sizeof(getdirentries64_flags_t));
*gdeflags = 0;
initial_seek = dirp->dd_td->seekoff;
dirp->dd_size = (long)__getdirentries64(dirp->dd_fd,
dirp->dd_buf, dirp->dd_len, &dirp->dd_td->seekoff);
if (dirp->dd_size >= 0 &&
dirp->dd_size <= dirp->dd_len - sizeof(getdirentries64_flags_t)) {
if (*gdeflags & GETDIRENTRIES64_EOF) {
dirp->dd_flags |= __DTF_ATEND;
}
}
#else
initial_seek = dirp->dd_seek;
dirp->dd_size = _getdirentries(dirp->dd_fd,
dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
#endif
if (dirp->dd_size <= 0)
return (NULL);
_fixtelldir(dirp, initial_seek, initial_loc);
}
dirp->dd_flags &= ~__DTF_SKIPREAD;
dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
if ((long)dp & 03L)
return (NULL);
if (dp->d_reclen <= 0 ||
dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
return (NULL);
dirp->dd_loc += dp->d_reclen;
if (dp->d_ino == 0 && skip)
continue;
if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW))
continue;
return (dp);
}
}
struct dirent *
readdir(DIR *dirp)
{
struct dirent *dp;
if (__isthreaded) {
_pthread_mutex_lock(&dirp->dd_lock);
dp = _readdir_unlocked(dirp, 1);
_pthread_mutex_unlock(&dirp->dd_lock);
}
else
dp = _readdir_unlocked(dirp, 1);
return (dp);
}
int
readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)
{
struct dirent *dp;
int saved_errno;
saved_errno = errno;
errno = 0;
if (__isthreaded) {
_pthread_mutex_lock(&dirp->dd_lock);
if ((dp = _readdir_unlocked(dirp, 1)) != NULL)
memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
_pthread_mutex_unlock(&dirp->dd_lock);
}
else if ((dp = _readdir_unlocked(dirp, 1)) != NULL)
memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
if (errno != 0) {
if (dp == NULL)
return (errno);
} else
errno = saved_errno;
if (dp != NULL)
*result = entry;
else
*result = NULL;
return (0);
}