-/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1996-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
- Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>
+ Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.
The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ 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
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+#include <ctype.h>
+#include <dlfcn.h>
#include <gconv.h>
#include <stdio.h>
#include <string.h>
#include <wchar.h>
#include <wcsmbsload.h>
+#include <limits.h>
+
+#include <sysdep.h>
wint_t
-__btowc (c)
- int c;
+__btowc (int c)
{
- char buf[sizeof (wchar_t)];
- struct gconv_step_data data;
- char inbuf[1];
- const char *inptr = inbuf;
- size_t converted;
- int status;
+ const struct gconv_fcts *fcts;
/* If the parameter does not fit into one byte or it is the EOF value
we can give the answer now. */
- if (c < -128 || c > 127 || c == EOF)
+ if (c < SCHAR_MIN || c > UCHAR_MAX || c == EOF)
return WEOF;
- /* Tell where we want the result. */
- data.outbuf = (char *) buf;
- data.outbufend = data.outbuf + sizeof (wchar_t);
- data.is_last = 1;
- data.statep = &data.__state;
+ /* We know that only ASCII compatible encodings are used for the
+ locale and that the wide character encoding is ISO 10646. */
+ if (isascii (c))
+ return (wint_t) c;
- /* Make sure we start in the initial state. */
- memset (&data.__state, '\0', sizeof (mbstate_t));
+ /* Get the conversion functions. */
+ fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
+ __gconv_btowc_fct btowc_fct = fcts->towc->__btowc_fct;
- /* Make sure we use the correct function. */
- update_conversion_ptrs ();
+ if (__builtin_expect (fcts->towc_nsteps == 1, 1)
+ && __builtin_expect (btowc_fct != NULL, 1))
+ {
+ /* Use the shortcut function. */
+#ifdef PTR_DEMANGLE
+ if (fcts->towc->__shlib_handle != NULL)
+ PTR_DEMANGLE (btowc_fct);
+#endif
+ return DL_CALL_FCT (btowc_fct, (fcts->towc, (unsigned char) c));
+ }
+ else
+ {
+ /* Fall back to the slow but generic method. */
+ wchar_t result;
+ struct __gconv_step_data data;
+ unsigned char inbuf[1];
+ const unsigned char *inptr = inbuf;
+ size_t dummy;
+ int status;
- /* Create the input string. */
- inbuf[0] = c;
+ /* Tell where we want the result. */
+ data.__outbuf = (unsigned char *) &result;
+ data.__outbufend = data.__outbuf + sizeof (wchar_t);
+ data.__invocation_counter = 0;
+ data.__internal_use = 1;
+ data.__flags = __GCONV_IS_LAST;
+ data.__statep = &data.__state;
- status = (*__wcsmbs_gconv_fcts.towc->fct) (__wcsmbs_gconv_fcts.towc,
- &data, &inptr, inptr + 1,
- &converted, 0);
- /* The conversion failed. */
- if (status != GCONV_OK && status != GCONV_FULL_OUTPUT
- && status != GCONV_EMPTY_INPUT)
- return WEOF;
+ /* Make sure we start in the initial state. */
+ memset (&data.__state, '\0', sizeof (mbstate_t));
+
+ /* Create the input string. */
+ inbuf[0] = c;
+
+ __gconv_fct fct = fcts->towc->__fct;
+#ifdef PTR_DEMANGLE
+ if (fcts->towc->__shlib_handle != NULL)
+ PTR_DEMANGLE (fct);
+#endif
+ status = DL_CALL_FCT (fct, (fcts->towc, &data, &inptr, inptr + 1,
+ NULL, &dummy, 0, 1));
+
+ if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
+ && status != __GCONV_EMPTY_INPUT)
+ /* The conversion failed. */
+ result = WEOF;
- return *(wchar_t *)buf;
+ return result;
+ }
}
weak_alias (__btowc, btowc)