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-rw-r--r--tests/btoc32.c68
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+/* Convert unibyte character to 32-bit wide character.
+ Copyright (C) 2020-2024 Free Software Foundation, Inc.
+
+ This file 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.
+
+ This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2020. */
+
+#include <config.h>
+
+#define IN_BTOC32
+/* Specification. */
+#include <uchar.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <wchar.h>
+
+#if GL_CHAR32_T_IS_UNICODE
+# include "lc-charset-unicode.h"
+#endif
+
+#if _GL_WCHAR_T_IS_UCS4
+_GL_EXTERN_INLINE
+#endif
+wint_t
+btoc32 (int c)
+{
+#if HAVE_WORKING_MBRTOC32 && !_GL_WCHAR_T_IS_UCS4
+ /* The char32_t encoding of a multibyte character may be different than its
+ wchar_t encoding. */
+ if (c != EOF)
+ {
+ mbstate_t state;
+ char s[1];
+ char32_t wc;
+
+ mbszero (&state);
+ s[0] = (unsigned char) c;
+ if (mbrtoc32 (&wc, s, 1, &state) <= 1)
+ return wc;
+ }
+ return WEOF;
+#else
+ /* In all known locale encodings, unibyte characters correspond only to
+ characters in the BMP. */
+ wint_t wc = btowc (c);
+# if GL_CHAR32_T_IS_UNICODE && GL_CHAR32_T_VS_WCHAR_T_NEEDS_CONVERSION
+ if (wc != WEOF && wc != 0)
+ {
+ wc = locale_encoding_to_unicode (wc);
+ if (wc == 0)
+ return WEOF;
+ }
+# endif
+ return wc;
+#endif
+}