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#include <dirent.h>
#include <string.h>
#include <errno.h>
#include <sys/syscall.h>
#include "../dirstream.h"
/* readdir fills up the buffer with the readdir system call. it also
gives a third parameter (currently ignored, but should be 1) that
can with a future kernel be enhanced to be the number of entries to
be gotten.
Right now the readdir system call return the number of characters
in the name - in the future it will probably return the number of
entries gotten. No matter - right now we just check for positive:
that will always work (as we know that it cannot be bigger than 1
in the future: we just asked for one entry). */
int
old_readdir_r (DIR *dir, struct dirent *entry,
struct dirent **ret)
{
int result;
int count = NUMENT;
if (dir->dd_size <= dir->dd_nextloc)
{
/* read count of directory entries. For now it should be one. */
__asm__ ("movel %2,%/d1\n\t"
"movel %3,%/d2\n\t"
"movel %4,%/d3\n\t"
"movel %1,%/d0\n\t"
"trap #0\n\t"
"movel %/d0,%0"
: "=g" (result)
: "i" (SYS_readdir), "g" (dir->dd_fd), "g" (dir->dd_buf),
"g" (count)
: "%d0", "%d1", "%d2", "%d3" );
if (result <= 0)
{
result = -result;
*ret = NULL;
return result;
}
/* Right now the readdir system call return the number of
characters in the name - in the future it will probably
return the number of entries gotten. No matter - right now
we just check for positive: */
#if 0
dir->dd_size = result;
#else
dir->dd_size = 1;
#endif
dir->dd_nextloc = 0;
}
/* We copy the dirent entry to entry. */
memcpy (entry, &dir->dd_buf[dir->dd_nextloc++], sizeof (struct dirent));
*ret = entry;
return 0;
}
#ifdef __ELF__
#pragma weak readdir_r = __libc_readdir_r
#endif
int
__libc_readdir_r (DIR *dir, struct dirent *entry, struct dirent **ret)
{
int result;
if (!dir || !entry || !ret || !*ret)
return EBADF;
/* Are we running an old kernel? */
if (dir->dd_getdents == no_getdents)
return old_readdir_r (dir, entry, ret);
if (dir->dd_size <= dir->dd_nextloc)
{
/* read dir->dd_max bytes of directory entries. */
__asm__ ("movel %2,%/d1\n\t"
"movel %3,%/d2\n\t"
"movel %4,%/d3\n\t"
"movel %1,%/d0\n\t"
"trap #0\n\t"
"movel %/d0,%0"
: "=g" (result)
: "i" (SYS_getdents), "g" (dir->dd_fd), "g" (dir->dd_buf),
"g" (dir->dd_max)
: "%d0", "%d1", "%d2", "%d3");
/* We assume we have getdents (). */
dir->dd_getdents = have_getdents;
if (result <= 0)
{
result = -result;
if (result == ENOSYS)
{
dir->dd_getdents = no_getdents;
return old_readdir_r (dir, entry, ret);
}
*ret = NULL;
return result;
}
dir->dd_size = result;
dir->dd_nextloc = 0;
}
/* We copy the dirent entry to entry. */
memcpy (entry, (char *) dir->dd_buf + dir->dd_nextloc,
sizeof (struct dirent));
*ret = entry;
/* Am I right? H.J. */
dir->dd_nextloc += entry->d_reclen;
/* We have to save the next offset here. */
dir->dd_nextoff = entry->d_off;
return 0;
}
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