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glibc/wcsmbs/btowc.c
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/* Copyright (C) 1996-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
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 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, 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 (int c) | |
{ | |
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 < SCHAR_MIN || c > UCHAR_MAX || c == EOF) | |
return WEOF; | |
/* 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; | |
/* Get the conversion functions. */ | |
fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); | |
__gconv_btowc_fct btowc_fct = fcts->towc->__btowc_fct; | |
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; | |
/* 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; | |
/* 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 result; | |
} | |
} | |
weak_alias (__btowc, btowc) |