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#include <reent.h>
#include <unistd.h>
#include <errno.h>
#include "fd.h"
_off_t
lseek (int fdi, _off_t pos, int whence)
{
if (fdi < 0 || fdi >= _fd_size)
{
errno = EBADF;
return -1;
}
ss_mutex_lock (&_fd_lock);
struct _fd *fd = _fds[fdi];
if (! fd)
{
errno = EBADF;
ss_mutex_unlock (&_fd_lock);
return -1;
}
ss_mutex_lock (&fd->lock);
ss_mutex_unlock (&_fd_lock);
if (fd->size == -1)
{
errno = EPIPE;
ss_mutex_unlock (&_fd_lock);
return -1;
}
switch (whence)
{
case SEEK_SET:
fd->pos = pos;
break;
case SEEK_CUR:
fd->pos += pos;
break;
case SEEK_END:
fd->pos = fd->size - pos;
break;
default:
break;
}
if (fd->pos < 0)
fd->pos = 0;
pos = fd->pos;
ss_mutex_unlock (&fd->lock);
return pos;
}
_off_t
_DEFUN (_lseek_r, (ptr, fd, pos, whence),
struct _reent *ptr _AND
int fd _AND
_off_t pos _AND
int whence)
{
return lseek (fd, pos, whence);
}
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