/* Copyright (C) 1991-2015 Free Software Foundation, Inc. This file is part of the GNU C Library. 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 <stdlib.h> #include <string.h> #include <wchar.h> #include <gconv.h> #include <wcsmbs/wcsmbsload.h> /* Convert the multibyte character at S, which is no longer than N characters, to its `wchar_t' representation, placing this n *PWC and returning its length. Attention: this function should NEVER be intentionally used. The interface is completely stupid. The state is shared between all conversion functions. You should use instead the restartable version `mbrtowc'. */ int mbtowc (wchar_t *pwc, const char *s, size_t n) { int result; static mbstate_t state; /* If S is NULL the function has to return null or not null depending on the encoding having a state depending encoding or not. */ if (s == NULL) { const struct gconv_fcts *fcts; /* Get the conversion functions. */ fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); /* This is an extension in the Unix standard which does not directly violate ISO C. */ memset (&state, '\0', sizeof state); result = fcts->towc->__stateful; } else if (*s == '\0') { if (pwc != NULL) *pwc = L'\0'; result = 0; } else { result = __mbrtowc (pwc, s, n, &state); /* The `mbrtowc' functions tell us more than we need. Fold the -1 and -2 result into -1. */ if (result < 0) result = -1; } return result; }