1 /* Copyright (C) 1994, 1997, 1999-2002, 2004, 2005, 2006
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>.
19 As a special exception, if you link the code in this file with
20 files compiled with a GNU compiler to produce an executable,
21 that does not cause the resulting executable to be covered by
22 the GNU Lesser General Public License. This exception does not
23 however invalidate any other reasons why the executable file
24 might be covered by the GNU Lesser General Public License.
25 This exception applies to code released by its copyright holders
26 in files containing the exception. */
32 static wint_t _IO_wstrn_overflow (_IO_FILE *fp, wint_t c) __THROW;
35 _IO_wstrn_overflow (fp, c)
39 /* When we come to here this means the user supplied buffer is
40 filled. But since we must return the number of characters which
41 would have been written in total we must provide a buffer for
42 further use. We can do this by writing on and on in the overflow
43 buffer in the _IO_wstrnfile structure. */
44 _IO_wstrnfile *snf = (_IO_wstrnfile *) fp;
46 if (fp->_wide_data->_IO_buf_base != snf->overflow_buf)
48 INTUSE(_IO_wsetb) (fp, snf->overflow_buf,
49 snf->overflow_buf + (sizeof (snf->overflow_buf)
50 / sizeof (wchar_t)), 0);
52 fp->_wide_data->_IO_write_base = snf->overflow_buf;
53 fp->_wide_data->_IO_read_base = snf->overflow_buf;
54 fp->_wide_data->_IO_read_ptr = snf->overflow_buf;
55 fp->_wide_data->_IO_read_end = (snf->overflow_buf
56 + (sizeof (snf->overflow_buf)
60 fp->_wide_data->_IO_write_ptr = snf->overflow_buf;
61 fp->_wide_data->_IO_write_end = snf->overflow_buf;
63 /* Since we are not really interested in storing the characters
64 which do not fit in the buffer we simply ignore it. */
69 const struct _IO_jump_t _IO_wstrn_jumps attribute_hidden =
72 JUMP_INIT(finish, _IO_wstr_finish),
73 JUMP_INIT(overflow, (_IO_overflow_t) _IO_wstrn_overflow),
74 JUMP_INIT(underflow, (_IO_underflow_t) _IO_wstr_underflow),
75 JUMP_INIT(uflow, (_IO_underflow_t) INTUSE(_IO_wdefault_uflow)),
76 JUMP_INIT(pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
77 JUMP_INIT(xsputn, INTUSE(_IO_wdefault_xsputn)),
78 JUMP_INIT(xsgetn, INTUSE(_IO_wdefault_xsgetn)),
79 JUMP_INIT(seekoff, _IO_wstr_seekoff),
80 JUMP_INIT(seekpos, _IO_default_seekpos),
81 JUMP_INIT(setbuf, _IO_default_setbuf),
82 JUMP_INIT(sync, _IO_default_sync),
83 JUMP_INIT(doallocate, INTUSE(_IO_wdefault_doallocate)),
84 JUMP_INIT(read, _IO_default_read),
85 JUMP_INIT(write, _IO_default_write),
86 JUMP_INIT(seek, _IO_default_seek),
87 JUMP_INIT(close, _IO_default_close),
88 JUMP_INIT(stat, _IO_default_stat),
89 JUMP_INIT(showmanyc, _IO_default_showmanyc),
90 JUMP_INIT(imbue, _IO_default_imbue)
95 _IO_vswprintf (string, maxlen, format, args)
98 const wchar_t *format;
103 struct _IO_wide_data wd;
105 sf.f._sbf._f._lock = NULL;
109 /* Since we have to write at least the terminating L'\0' a buffer
110 length of zero always makes the function fail. */
113 _IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, 0, &wd, &_IO_wstrn_jumps);
114 _IO_fwide (&sf.f._sbf._f, 1);
116 _IO_wstr_init_static (&sf.f._sbf._f, string, maxlen - 1, string);
117 ret = _IO_vfwprintf ((_IO_FILE *) &sf.f._sbf, format, args);
119 if (sf.f._sbf._f._wide_data->_IO_buf_base == sf.overflow_buf)
120 /* ISO C99 requires swprintf/vswprintf to return an error if the
121 output does not fit in the provided buffer. */
124 /* Terminate the string. */
125 *sf.f._sbf._f._wide_data->_IO_write_ptr = '\0';
129 weak_alias (_IO_vswprintf, __vswprintf)
130 ldbl_weak_alias (_IO_vswprintf, vswprintf)