1 /* Convert 32-bit wide character to unibyte character. 2 Copyright (C) 2020-2021 Free Software Foundation, Inc. 3 4 This file is free software: you can redistribute it and/or modify 5 it under the terms of the GNU Lesser General Public License as 6 published by the Free Software Foundation; either version 3 of the 7 License, or (at your option) any later version. 8 9 This file is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public License 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 16 17 /* Written by Bruno Haible <bruno@clisp.org>, 2020. */ 18 19 #include <config.h> 20 21 /* Specification. */ 22 #include <uchar.h> 23 24 #include <stdio.h> 25 #include <string.h> 26 #include <wchar.h> 27 28 int 29 c32tob (wint_t wc) /* */ 30 { 31 #if HAVE_WORKING_MBRTOC32 && !defined __GLIBC__ 32 /* The char32_t encoding of a multibyte character may be different than its 33 wchar_t encoding. */ 34 if (wc != WEOF) 35 { 36 mbstate_t state; 37 char buf[8]; 38 39 memset (&state, '\0', sizeof (mbstate_t)); 40 if (c32rtomb (buf, wc, &state) == 1) 41 return (unsigned char) buf[0]; 42 } 43 return EOF; 44 #elif _GL_LARGE_CHAR32_T 45 /* In all known encodings, unibyte characters correspond only to 46 characters in the BMP. */ 47 if (wc != WEOF && (wchar_t) wc == wc) 48 return wctob ((wchar_t) wc); 49 else 50 return EOF; 51 #else 52 return wctob (wc); 53 #endif 54 }