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authorUlrich Drepper <drepper@redhat.com>2001-08-09 08:50:50 +0000
committerUlrich Drepper <drepper@redhat.com>2001-08-09 08:50:50 +0000
commit40a982a9e1b825b175be7bc7c7199c6bdf363e4b (patch)
tree7523a21da3e35bed6e56133efbe1d16dadb6e6da /libio/wfileops.c
parent0f78390bd799fc0b0394240a9a704591481ac8c6 (diff)
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Update.
2001-08-09 Ulrich Drepper <drepper@redhat.com> * libio/wfileops.c (_IO_wfile_seekoff): Don't even try to handle seeking with backup buffer present. Correct determining of internal buffer position. Reset also wide buffers if we reset the internal buffers. * libio/iofwide.c (_IO_fwide): Always determine file offset for wide streams. * libio/ioseekoff.c: Catch one unimplemented case. * libio/ftello.c: Don't abort if the wide stream has backup buffer. * libio/ftello64.c: Likewise. * libio/iofgetpos.c: Likewise. * libio/iofgetpos64.c: Likewise. * libio/ftell.c: Likewise. * libio/Makefile (tests): Add tst-ungetwc2. * libio/tst-ungetwc2.c: New file.
Diffstat (limited to 'libio/wfileops.c')
-rw-r--r--libio/wfileops.c32
1 files changed, 29 insertions, 3 deletions
diff --git a/libio/wfileops.c b/libio/wfileops.c
index e88c065..92d1a08 100644
--- a/libio/wfileops.c
+++ b/libio/wfileops.c
@@ -458,7 +458,28 @@ _IO_wfile_seekoff (fp, offset, dir, mode)
== fp->_wide_data->_IO_write_ptr));
if (mode == 0)
- dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */
+ {
+ /* XXX For wide stream with backup store it is not very
+ reasonable to determine the offset. The pushed-back
+ character might require a state change and we need not be
+ able to compute the initial state by reverse transformation
+ since there is no guarantee of symmetry. So we don't even
+ try and return an error. */
+ if (_IO_in_backup (fp))
+ {
+ if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ /* There is no more data in the backup buffer. We can
+ switch back. */
+ _IO_switch_to_main_wget_area (fp);
+ }
+
+ dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */
+ }
/* Flush unwritten characters.
(This may do an unneeded write if we seek within the buffer.
@@ -466,7 +487,7 @@ _IO_wfile_seekoff (fp, offset, dir, mode)
egptr to ptr. That can't be done in the current design,
which assumes file_ptr() is eGptr. Anyway, since we probably
end up flushing when we close(), it doesn't make much difference.)
- FIXME: simulate mem-papped files. */
+ FIXME: simulate mem-mapped files. */
if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_write_base
|| _IO_in_put_mode (fp))
@@ -509,12 +530,13 @@ _IO_wfile_seekoff (fp, offset, dir, mode)
{
int nread;
- delta = fp->_wide_data->_IO_read_ptr - fp->_wide_data->_IO_read_end;
+ delta = fp->_wide_data->_IO_read_ptr - fp->_wide_data->_IO_read_base;
fp->_wide_data->_IO_state = fp->_wide_data->_IO_last_state;
nread = (*cv->__codecvt_do_length) (cv, &fp->_wide_data->_IO_state,
fp->_IO_read_base,
fp->_IO_read_end, delta);
fp->_IO_read_ptr = fp->_IO_read_base + nread;
+ fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_read_ptr;
offset -= fp->_IO_read_end - fp->_IO_read_base - nread;
}
@@ -651,6 +673,10 @@ _IO_wfile_seekoff (fp, offset, dir, mode)
fp->_offset = result;
_IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
_IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base);
+ _IO_wsetg (fp, fp->_wide_data->_IO_buf_base,
+ fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base);
+ _IO_wsetp (fp, fp->_wide_data->_IO_buf_base,
+ fp->_wide_data->_IO_buf_base);
}
return result;