1 /* Copyright (C) 1996-2000,2002,2005 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26 #include <wcsmbsload.h>
36 const struct gconv_fcts *fcts;
38 /* If the parameter does not fit into one byte or it is the EOF value
39 we can give the answer now. */
40 if (c < SCHAR_MIN || c > UCHAR_MAX || c == EOF)
43 /* We know that only ASCII compatible encodings are used for the
44 locale and that the wide character encoding is ISO 10646. */
48 /* Get the conversion functions. */
49 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
50 __gconv_btowc_fct btowc_fct = fcts->towc->__btowc_fct;
52 if (__builtin_expect (fcts->towc_nsteps == 1, 1)
53 && __builtin_expect (btowc_fct != NULL, 1))
55 /* Use the shortcut function. */
57 if (fcts->towc->__shlib_handle != NULL)
58 PTR_DEMANGLE (btowc_fct);
60 return DL_CALL_FCT (btowc_fct, (fcts->towc, (unsigned char) c));
64 /* Fall back to the slow but generic method. */
66 struct __gconv_step_data data;
67 unsigned char inbuf[1];
68 const unsigned char *inptr = inbuf;
72 /* Tell where we want the result. */
73 data.__outbuf = (unsigned char *) &result;
74 data.__outbufend = data.__outbuf + sizeof (wchar_t);
75 data.__invocation_counter = 0;
76 data.__internal_use = 1;
77 data.__flags = __GCONV_IS_LAST;
78 data.__statep = &data.__state;
81 /* Make sure we start in the initial state. */
82 memset (&data.__state, '\0', sizeof (mbstate_t));
84 /* Create the input string. */
87 __gconv_fct fct = fcts->towc->__fct;
89 if (fcts->towc->__shlib_handle != NULL)
92 status = DL_CALL_FCT (fct, (fcts->towc, &data, &inptr, inptr + 1,
95 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
96 && status != __GCONV_EMPTY_INPUT)
97 /* The conversion failed. */
103 weak_alias (__btowc, btowc)