/* Copyright (C) 1991,1997,1998,1999,2000,2002 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <stdlib.h> #include <string.h> #include <wchar.h> #include <gconv.h> #include <wcsmbs/wcsmbsload.h> /* Internal state. */ static mbstate_t state; /* Return the length of the multibyte character (if there is one) at S which is no longer than N characters. The ISO C standard says that the `mblen' function must not change the state of the `mbtowc' function. */ int mblen (const char *s, size_t n) { int result; /* 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)); /* Reset the state. */ memset (&state, '\0', sizeof state); result = fcts->towc->__stateful; } else if (*s == '\0') /* According to the ISO C 89 standard this is the expected behaviour. */ result = 0; else { memset (&state, '\0', sizeof state); result = __mbrtowc (NULL, 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; }