wint_t
_IO_wdefault_pbackfail (FILE *fp, wint_t c)
{
if (fp->_wide_data->_IO_read_ptr > fp->_wide_data->_IO_read_base
&& !_IO_in_backup (fp)
&& (wint_t) fp->_IO_read_ptr[-1] == c)
--fp->_IO_read_ptr;
else
{
/* Need to handle a filebuf in write mode (switch to read mode). FIXME!*/
if (!_IO_in_backup (fp))
{
/* We need to keep the invariant that the main get area
logically follows the backup area. */
if (fp->_wide_data->_IO_read_ptr > fp->_wide_data->_IO_read_base
&& _IO_have_wbackup (fp))
{
if (save_for_wbackup (fp, fp->_wide_data->_IO_read_ptr))
return WEOF;
}
else if (!_IO_have_wbackup (fp))
{
/* No backup buffer: allocate one. */
/* Use nshort buffer, if unused? (probably not) FIXME */
int backup_size = 128;
wchar_t *bbuf = (wchar_t *) malloc (backup_size
* sizeof (wchar_t));
if (bbuf == NULL)
return WEOF;
fp->_wide_data->_IO_save_base = bbuf;
fp->_wide_data->_IO_save_end = (fp->_wide_data->_IO_save_base
+ backup_size);
fp->_wide_data->_IO_backup_base = fp->_wide_data->_IO_save_end;
}
fp->_wide_data->_IO_read_base = fp->_wide_data->_IO_read_ptr;
_IO_switch_to_wbackup_area (fp);
}
else if (fp->_wide_data->_IO_read_ptr <= fp->_wide_data->_IO_read_base)
{
/* Increase size of existing backup buffer. */
size_t new_size;
size_t old_size = (fp->_wide_data->_IO_read_end
- fp->_wide_data->_IO_read_base);
wchar_t *new_buf;
new_size = 2 * old_size;
new_buf = (wchar_t *) malloc (new_size * sizeof (wchar_t));
if (new_buf == NULL)
return WEOF;
__wmemcpy (new_buf + (new_size - old_size),
fp->_wide_data->_IO_read_base, old_size);
free (fp->_wide_data->_IO_read_base);
_IO_wsetg (fp, new_buf, new_buf + (new_size - old_size),
new_buf + new_size);
fp->_wide_data->_IO_backup_base = fp->_wide_data->_IO_read_ptr;
}
*--fp->_wide_data->_IO_read_ptr = c;
}
return c;
}
int
_IO_new_file_close_it (_IO_FILE *fp)
{
int write_status;
if (!_IO_file_is_open (fp))
return EOF;
if ((fp->_flags & _IO_NO_WRITES) == 0
&& (fp->_flags & _IO_CURRENTLY_PUTTING) != 0)
write_status = _IO_do_flush (fp);
else
write_status = 0;
_IO_unsave_markers (fp);
int close_status = ((fp->_flags2 & _IO_FLAGS2_NOCLOSE) == 0
? _IO_SYSCLOSE (fp) : 0);
/* Free buffer. */
#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
if (fp->_mode > 0)
{
if (_IO_have_wbackup (fp))
_IO_free_wbackup_area (fp);
_IO_wsetb (fp, NULL, NULL, 0);
_IO_wsetg (fp, NULL, NULL, NULL);
_IO_wsetp (fp, NULL, NULL);
}
#endif
_IO_setb (fp, NULL, NULL, 0);
_IO_setg (fp, NULL, NULL, NULL);
_IO_setp (fp, NULL, NULL);
_IO_un_link ((struct _IO_FILE_plus *) fp);
fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS;
fp->_fileno = -1;
fp->_offset = _IO_pos_BAD;
return close_status ? close_status : write_status;
}
/* Convert TO_DO wide character from DATA to FP.
Then mark FP as having empty buffers. */
int
_IO_wdo_write (_IO_FILE *fp, const wchar_t *data, _IO_size_t to_do)
{
struct _IO_codecvt *cc = fp->_codecvt;
if (to_do > 0)
{
if (fp->_IO_write_end == fp->_IO_write_ptr
&& fp->_IO_write_end != fp->_IO_write_base)
{
if (_IO_new_do_write (fp, fp->_IO_write_base,
fp->_IO_write_ptr - fp->_IO_write_base) == EOF)
return WEOF;
}
do
{
enum __codecvt_result result;
const wchar_t *new_data;
char mb_buf[MB_LEN_MAX];
char *write_base, *write_ptr, *buf_end;
if (fp->_IO_write_ptr - fp->_IO_write_base < sizeof (mb_buf))
{
/* Make sure we have room for at least one multibyte
character. */
write_ptr = write_base = mb_buf;
buf_end = mb_buf + sizeof (mb_buf);
}
else
{
write_ptr = fp->_IO_write_ptr;
write_base = fp->_IO_write_base;
buf_end = fp->_IO_buf_end;
}
/* Now convert from the internal format into the external buffer. */
result = (*cc->__codecvt_do_out) (cc, &fp->_wide_data->_IO_state,
data, data + to_do, &new_data,
write_ptr,
buf_end,
&write_ptr);
/* Write out what we produced so far. */
if (_IO_new_do_write (fp, write_base, write_ptr - write_base) == EOF)
/* Something went wrong. */
return WEOF;
to_do -= new_data - data;
/* Next see whether we had problems during the conversion. If yes,
we cannot go on. */
if (result != __codecvt_ok
&& (result != __codecvt_partial || new_data - data == 0))
break;
data = new_data;
}
while (to_do > 0);
}
_IO_wsetg (fp, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base,
fp->_wide_data->_IO_buf_base);
fp->_wide_data->_IO_write_base = fp->_wide_data->_IO_write_ptr
= fp->_wide_data->_IO_buf_base;
fp->_wide_data->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED))
? fp->_wide_data->_IO_buf_base
: fp->_wide_data->_IO_buf_end);
return to_do == 0 ? 0 : WEOF;
}
_IO_off64_t
_IO_wfile_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode)
{
_IO_off64_t result;
_IO_off64_t delta, new_offset;
long int count;
/* Short-circuit into a separate function. We don't want to mix any
functionality and we don't want to touch anything inside the FILE
object. */
if (mode == 0)
return do_ftell_wide (fp);
/* POSIX.1 8.2.3.7 says that after a call the fflush() the file
offset of the underlying file must be exact. */
int must_be_exact = ((fp->_wide_data->_IO_read_base
== fp->_wide_data->_IO_read_end)
&& (fp->_wide_data->_IO_write_base
== fp->_wide_data->_IO_write_ptr));
bool was_writing = ((fp->_wide_data->_IO_write_ptr
> fp->_wide_data->_IO_write_base)
|| _IO_in_put_mode (fp));
/* Flush unwritten characters.
(This may do an unneeded write if we seek within the buffer.
But to be able to switch to reading, we would need to set
egptr to pptr. 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-mapped files. */
if (was_writing && _IO_switch_to_wget_mode (fp))
return WEOF;
if (fp->_wide_data->_IO_buf_base == NULL)
{
/* It could be that we already have a pushback buffer. */
if (fp->_wide_data->_IO_read_base != NULL)
{
free (fp->_wide_data->_IO_read_base);
fp->_flags &= ~_IO_IN_BACKUP;
}
_IO_doallocbuf (fp);
_IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base);
_IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
_IO_wsetp (fp, fp->_wide_data->_IO_buf_base,
fp->_wide_data->_IO_buf_base);
_IO_wsetg (fp, fp->_wide_data->_IO_buf_base,
fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base);
}
switch (dir)
{
struct _IO_codecvt *cv;
int clen;
case _IO_seek_cur:
/* Adjust for read-ahead (bytes is buffer). To do this we must
find out which position in the external buffer corresponds to
the current position in the internal buffer. */
cv = fp->_codecvt;
clen = (*cv->__codecvt_do_encoding) (cv);
if (mode != 0 || !was_writing)
{
if (clen > 0)
{
offset -= (fp->_wide_data->_IO_read_end
- fp->_wide_data->_IO_read_ptr) * clen;
/* Adjust by readahead in external buffer. */
offset -= fp->_IO_read_end - fp->_IO_read_ptr;
}
else
{
int nread;
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;
}
}
if (fp->_offset == _IO_pos_BAD)
goto dumb;
/* Make offset absolute, assuming current pointer is file_ptr(). */
offset += fp->_offset;
dir = _IO_seek_set;
break;
case _IO_seek_set:
break;
case _IO_seek_end:
{
struct stat64 st;
if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode))
{
offset += st.st_size;
dir = _IO_seek_set;
}
else
goto dumb;
}
}
/* At this point, dir==_IO_seek_set. */
/* If destination is within current buffer, optimize: */
if (fp->_offset != _IO_pos_BAD && fp->_IO_read_base != NULL
&& !_IO_in_backup (fp))
{
_IO_off64_t start_offset = (fp->_offset
- (fp->_IO_read_end - fp->_IO_buf_base));
if (offset >= start_offset && offset < fp->_offset)
{
_IO_setg (fp, fp->_IO_buf_base,
fp->_IO_buf_base + (offset - start_offset),
fp->_IO_read_end);
_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);
if (adjust_wide_data (fp, false))
goto dumb;
_IO_mask_flags (fp, 0, _IO_EOF_SEEN);
goto resync;
}
}
if (fp->_flags & _IO_NO_READS)
goto dumb;
/* Try to seek to a block boundary, to improve kernel page management. */
new_offset = offset & ~(fp->_IO_buf_end - fp->_IO_buf_base - 1);
delta = offset - new_offset;
if (delta > fp->_IO_buf_end - fp->_IO_buf_base)
{
new_offset = offset;
delta = 0;
}
result = _IO_SYSSEEK (fp, new_offset, 0);
if (result < 0)
return EOF;
if (delta == 0)
count = 0;
else
{
count = _IO_SYSREAD (fp, fp->_IO_buf_base,
(must_be_exact
? delta : fp->_IO_buf_end - fp->_IO_buf_base));
if (count < delta)
{
/* We weren't allowed to read, but try to seek the remainder. */
offset = count == EOF ? delta : delta-count;
dir = _IO_seek_cur;
goto dumb;
}
}
_IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + delta,
fp->_IO_buf_base + count);
_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);
if (adjust_wide_data (fp, true))
goto dumb;
fp->_offset = result + count;
_IO_mask_flags (fp, 0, _IO_EOF_SEEN);
return offset;
dumb:
_IO_unsave_markers (fp);
result = _IO_SYSSEEK (fp, offset, dir);
if (result != EOF)
{
_IO_mask_flags (fp, 0, _IO_EOF_SEEN);
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;
resync:
/* We need to do it since it is possible that the file offset in
the kernel may be changed behind our back. It may happen when
we fopen a file and then do a fork. One process may access the
file and the kernel file offset will be changed. */
if (fp->_offset >= 0)
_IO_SYSSEEK (fp, fp->_offset, 0);
return offset;
}
wint_t
_IO_wfile_overflow (_IO_FILE *f, wint_t wch)
{
if (f->_flags & _IO_NO_WRITES) /* SET ERROR */
{
f->_flags |= _IO_ERR_SEEN;
__set_errno (EBADF);
return WEOF;
}
/* If currently reading or no buffer allocated. */
if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0)
{
/* Allocate a buffer if needed. */
if (f->_wide_data->_IO_write_base == 0)
{
_IO_wdoallocbuf (f);
_IO_wsetg (f, f->_wide_data->_IO_buf_base,
f->_wide_data->_IO_buf_base, f->_wide_data->_IO_buf_base);
if (f->_IO_write_base == NULL)
{
_IO_doallocbuf (f);
_IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base);
}
}
else
{
/* Otherwise must be currently reading. If _IO_read_ptr
(and hence also _IO_read_end) is at the buffer end,
logically slide the buffer forwards one block (by setting
the read pointers to all point at the beginning of the
block). This makes room for subsequent output.
Otherwise, set the read pointers to _IO_read_end (leaving
that alone, so it can continue to correspond to the
external position). */
if (f->_wide_data->_IO_read_ptr == f->_wide_data->_IO_buf_end)
{
f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base;
f->_wide_data->_IO_read_end = f->_wide_data->_IO_read_ptr =
f->_wide_data->_IO_buf_base;
}
}
f->_wide_data->_IO_write_ptr = f->_wide_data->_IO_read_ptr;
f->_wide_data->_IO_write_base = f->_wide_data->_IO_write_ptr;
f->_wide_data->_IO_write_end = f->_wide_data->_IO_buf_end;
f->_wide_data->_IO_read_base = f->_wide_data->_IO_read_ptr =
f->_wide_data->_IO_read_end;
f->_IO_write_ptr = f->_IO_read_ptr;
f->_IO_write_base = f->_IO_write_ptr;
f->_IO_write_end = f->_IO_buf_end;
f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end;
f->_flags |= _IO_CURRENTLY_PUTTING;
if (f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED))
f->_wide_data->_IO_write_end = f->_wide_data->_IO_write_ptr;
}
if (wch == WEOF)
return _IO_do_flush (f);
if (f->_wide_data->_IO_write_ptr == f->_wide_data->_IO_buf_end)
/* Buffer is really full */
if (_IO_do_flush (f) == EOF)
return WEOF;
*f->_wide_data->_IO_write_ptr++ = wch;
if ((f->_flags & _IO_UNBUFFERED)
|| ((f->_flags & _IO_LINE_BUF) && wch == L'\n'))
if (_IO_do_flush (f) == EOF)
return WEOF;
return wch;
}
