1 /* Copyright (C) 1996-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.
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/>. */
25 #include <wcsmbsload.h>
35 const struct gconv_fcts *fcts;
37 /* If the parameter does not fit into one byte or it is the EOF value
38 we can give the answer now. */
39 if (c < SCHAR_MIN || c > UCHAR_MAX || c == EOF)
42 /* We know that only ASCII compatible encodings are used for the
43 locale and that the wide character encoding is ISO 10646. */
47 /* Get the conversion functions. */
48 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
49 __gconv_btowc_fct btowc_fct = fcts->towc->__btowc_fct;
51 if (__builtin_expect (fcts->towc_nsteps == 1, 1)
52 && __builtin_expect (btowc_fct != NULL, 1))
54 /* Use the shortcut function. */
56 if (fcts->towc->__shlib_handle != NULL)
57 PTR_DEMANGLE (btowc_fct);
59 return DL_CALL_FCT (btowc_fct, (fcts->towc, (unsigned char) c));
63 /* Fall back to the slow but generic method. */
65 struct __gconv_step_data data;
66 unsigned char inbuf[1];
67 const unsigned char *inptr = inbuf;
71 /* Tell where we want the result. */
72 data.__outbuf = (unsigned char *) &result;
73 data.__outbufend = data.__outbuf + sizeof (wchar_t);
74 data.__invocation_counter = 0;
75 data.__internal_use = 1;
76 data.__flags = __GCONV_IS_LAST;
77 data.__statep = &data.__state;
79 /* Make sure we start in the initial state. */
80 memset (&data.__state, '\0', sizeof (mbstate_t));
82 /* Create the input string. */
85 __gconv_fct fct = fcts->towc->__fct;
87 if (fcts->towc->__shlib_handle != NULL)
90 status = DL_CALL_FCT (fct, (fcts->towc, &data, &inptr, inptr + 1,
93 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
94 && status != __GCONV_EMPTY_INPUT)
95 /* The conversion failed. */
101 weak_alias (__btowc, btowc)