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glibc/libio/wstrops.c

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/* Copyright (C) 1993,1997-1999,2001-2004, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.
As a special exception, if you link the code in this file with
files compiled with a GNU compiler to produce an executable,
that does not cause the resulting executable to be covered by
the GNU Lesser General Public License. This exception does not
however invalidate any other reasons why the executable file
might be covered by the GNU Lesser General Public License.
This exception applies to code released by its copyright holders
in files containing the exception. */
#include <assert.h>
#include "strfile.h"
#include "libioP.h"
#include <string.h>
#include <wchar.h>
#include <stdio_ext.h>
void
_IO_wstr_init_static (fp, ptr, size, pstart)
_IO_FILE *fp;
wchar_t *ptr;
_IO_size_t size;
wchar_t *pstart;
{
wchar_t *end;
if (size == 0)
end = ptr + __wcslen (ptr);
else if ((_IO_size_t) ptr + size * sizeof (wchar_t) > (_IO_size_t) ptr)
end = ptr + size;
else
/* Even for misaligned ptr make sure there is integral number of wide
characters. */
end = ptr + (-1 - (_IO_size_t) ptr) / sizeof (wchar_t);
INTUSE(_IO_wsetb) (fp, ptr, end, 0);
fp->_wide_data->_IO_write_base = ptr;
fp->_wide_data->_IO_read_base = ptr;
fp->_wide_data->_IO_read_ptr = ptr;
if (pstart)
{
fp->_wide_data->_IO_write_ptr = pstart;
fp->_wide_data->_IO_write_end = end;
fp->_wide_data->_IO_read_end = pstart;
}
else
{
fp->_wide_data->_IO_write_ptr = ptr;
fp->_wide_data->_IO_write_end = ptr;
fp->_wide_data->_IO_read_end = end;
}
/* A null _allocate_buffer function flags the strfile as being static. */
(((_IO_strfile *) fp)->_s._allocate_buffer) = (_IO_alloc_type)0;
}
_IO_wint_t
_IO_wstr_overflow (fp, c)
_IO_FILE *fp;
_IO_wint_t c;
{
int flush_only = c == WEOF;
_IO_size_t pos;
if (fp->_flags & _IO_NO_WRITES)
return flush_only ? 0 : WEOF;
if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING))
{
fp->_flags |= _IO_CURRENTLY_PUTTING;
fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_read_ptr;
fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end;
}
pos = fp->_wide_data->_IO_write_ptr - fp->_wide_data->_IO_write_base;
if (pos >= (_IO_size_t) (_IO_wblen (fp) + flush_only))
{
if (fp->_flags2 & _IO_FLAGS2_USER_WBUF) /* not allowed to enlarge */
return WEOF;
else
{
wchar_t *new_buf;
wchar_t *old_buf = fp->_wide_data->_IO_buf_base;
size_t old_wblen = _IO_wblen (fp);
_IO_size_t new_size = 2 * old_wblen + 100;
if (new_size < old_wblen)
return EOF;
new_buf
= (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size
* sizeof (wchar_t));
if (new_buf == NULL)
{
/* __ferror(fp) = 1; */
return WEOF;
}
if (old_buf)
{
__wmemcpy (new_buf, old_buf, old_wblen);
(*((_IO_strfile *) fp)->_s._free_buffer) (old_buf);
/* Make sure _IO_setb won't try to delete _IO_buf_base. */
fp->_wide_data->_IO_buf_base = NULL;
}
wmemset (new_buf + old_wblen, L'\0', new_size - old_wblen);
INTUSE(_IO_wsetb) (fp, new_buf, new_buf + new_size, 1);
fp->_wide_data->_IO_read_base =
new_buf + (fp->_wide_data->_IO_read_base - old_buf);
fp->_wide_data->_IO_read_ptr =
new_buf + (fp->_wide_data->_IO_read_ptr - old_buf);
fp->_wide_data->_IO_read_end =
new_buf + (fp->_wide_data->_IO_read_end - old_buf);
fp->_wide_data->_IO_write_ptr =
new_buf + (fp->_wide_data->_IO_write_ptr - old_buf);
fp->_wide_data->_IO_write_base = new_buf;
fp->_wide_data->_IO_write_end = fp->_wide_data->_IO_buf_end;
}
}
if (!flush_only)
*fp->_wide_data->_IO_write_ptr++ = c;
if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end)
fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr;
return c;
}
_IO_wint_t
_IO_wstr_underflow (fp)
_IO_FILE *fp;
{
if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end)
fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr;
if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING))
{
fp->_flags &= ~_IO_CURRENTLY_PUTTING;
fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_write_ptr;
fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_end;
}
if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end)
return *fp->_wide_data->_IO_read_ptr;
else
return WEOF;
}
/* The size of the valid part of the buffer. */
_IO_ssize_t
_IO_wstr_count (fp)
_IO_FILE *fp;
{
struct _IO_wide_data *wd = fp->_wide_data;
return ((wd->_IO_write_ptr > wd->_IO_read_end
? wd->_IO_write_ptr : wd->_IO_read_end)
- wd->_IO_read_base);
}
static int
enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading)
{
if ((_IO_ssize_t) offset <= _IO_blen (fp))
return 0;
struct _IO_wide_data *wd = fp->_wide_data;
_IO_ssize_t oldend = wd->_IO_write_end - wd->_IO_write_base;
/* Try to enlarge the buffer. */
if (fp->_flags2 & _IO_FLAGS2_USER_WBUF)
/* User-provided buffer. */
return 1;
_IO_size_t newsize = offset + 100;
wchar_t *oldbuf = wd->_IO_buf_base;
wchar_t *newbuf
= (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize
* sizeof (wchar_t));
if (newbuf == NULL)
return 1;
if (oldbuf != NULL)
{
__wmemcpy (newbuf, oldbuf, _IO_wblen (fp));
(*((_IO_strfile *) fp)->_s._free_buffer) (oldbuf);
/* Make sure _IO_setb won't try to delete
_IO_buf_base. */
wd->_IO_buf_base = NULL;
}
INTUSE(_IO_wsetb) (fp, newbuf, newbuf + newsize, 1);
if (reading)
{
wd->_IO_write_base = newbuf + (wd->_IO_write_base - oldbuf);
wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf);
wd->_IO_write_end = newbuf + (wd->_IO_write_end - oldbuf);
wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf);
wd->_IO_read_base = newbuf;
wd->_IO_read_end = wd->_IO_buf_end;
}
else
{
wd->_IO_read_base = newbuf + (wd->_IO_read_base - oldbuf);
wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf);
wd->_IO_read_end = newbuf + (wd->_IO_read_end - oldbuf);
wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf);
wd->_IO_write_base = newbuf;
wd->_IO_write_end = wd->_IO_buf_end;
}
/* Clear the area between the last write position and th
new position. */
assert (offset >= oldend);
if (reading)
wmemset (wd->_IO_read_base + oldend, L'\0', offset - oldend);
else
wmemset (wd->_IO_write_base + oldend, L'\0', offset - oldend);
return 0;
}
_IO_off64_t
_IO_wstr_seekoff (fp, offset, dir, mode)
_IO_FILE *fp;
_IO_off64_t offset;
int dir;
int mode;
{
_IO_off64_t new_pos;
if (mode == 0 && (fp->_flags & _IO_TIED_PUT_GET))
mode = (fp->_flags & _IO_CURRENTLY_PUTTING ? _IOS_OUTPUT : _IOS_INPUT);
if (mode == 0)
{
/* Don't move any pointers. But there is no clear indication what
mode FP is in. Let's guess. */
if (fp->_IO_file_flags & _IO_NO_WRITES)
new_pos = fp->_wide_data->_IO_read_ptr - fp->_wide_data->_IO_read_base;
else
new_pos = (fp->_wide_data->_IO_write_ptr
- fp->_wide_data->_IO_write_base);
}
else
{
_IO_ssize_t cur_size = _IO_wstr_count (fp);
new_pos = EOF;
/* Move the get pointer, if requested. */
if (mode & _IOS_INPUT)
{
switch (dir)
{
case _IO_seek_end:
offset += cur_size;
break;
case _IO_seek_cur:
offset += (fp->_wide_data->_IO_read_ptr
- fp->_wide_data->_IO_read_base);
break;
default: /* case _IO_seek_set: */
break;
}
if (offset < 0)
return EOF;
if ((_IO_ssize_t) offset > cur_size
&& enlarge_userbuf (fp, offset, 1) != 0)
return EOF;
fp->_wide_data->_IO_read_ptr = (fp->_wide_data->_IO_read_base
+ offset);
fp->_wide_data->_IO_read_end = (fp->_wide_data->_IO_read_base
+ cur_size);
new_pos = offset;
}
/* Move the put pointer, if requested. */
if (mode & _IOS_OUTPUT)
{
switch (dir)
{
case _IO_seek_end:
offset += cur_size;
break;
case _IO_seek_cur:
offset += (fp->_wide_data->_IO_write_ptr
- fp->_wide_data->_IO_write_base);
break;
default: /* case _IO_seek_set: */
break;
}
if (offset < 0)
return EOF;
if ((_IO_ssize_t) offset > cur_size
&& enlarge_userbuf (fp, offset, 0) != 0)
return EOF;
fp->_wide_data->_IO_write_ptr = (fp->_wide_data->_IO_write_base
+ offset);
new_pos = offset;
}
}
return new_pos;
}
_IO_wint_t
_IO_wstr_pbackfail (fp, c)
_IO_FILE *fp;
_IO_wint_t c;
{
if ((fp->_flags & _IO_NO_WRITES) && c != WEOF)
return WEOF;
return INTUSE(_IO_wdefault_pbackfail) (fp, c);
}
void
_IO_wstr_finish (fp, dummy)
_IO_FILE *fp;
int dummy;
{
if (fp->_wide_data->_IO_buf_base && !(fp->_flags2 & _IO_FLAGS2_USER_WBUF))
(((_IO_strfile *) fp)->_s._free_buffer) (fp->_wide_data->_IO_buf_base);
fp->_wide_data->_IO_buf_base = NULL;
INTUSE(_IO_wdefault_finish) (fp, 0);
}
const struct _IO_jump_t _IO_wstr_jumps =
{
JUMP_INIT_DUMMY,
JUMP_INIT(finish, _IO_wstr_finish),
JUMP_INIT(overflow, (_IO_overflow_t) _IO_wstr_overflow),
JUMP_INIT(underflow, (_IO_underflow_t) _IO_wstr_underflow),
JUMP_INIT(uflow, (_IO_underflow_t) INTUSE(_IO_wdefault_uflow)),
JUMP_INIT(pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
JUMP_INIT(xsputn, INTUSE(_IO_wdefault_xsputn)),
JUMP_INIT(xsgetn, INTUSE(_IO_wdefault_xsgetn)),
JUMP_INIT(seekoff, _IO_wstr_seekoff),
JUMP_INIT(seekpos, _IO_default_seekpos),
JUMP_INIT(setbuf, _IO_default_setbuf),
JUMP_INIT(sync, _IO_default_sync),
JUMP_INIT(doallocate, INTUSE(_IO_wdefault_doallocate)),
JUMP_INIT(read, _IO_default_read),
JUMP_INIT(write, _IO_default_write),
JUMP_INIT(seek, _IO_default_seek),
JUMP_INIT(close, _IO_default_close),
JUMP_INIT(stat, _IO_default_stat),
JUMP_INIT(showmanyc, _IO_default_showmanyc),
JUMP_INIT(imbue, _IO_default_imbue)
};
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