1 files changed, 47 insertions, 0 deletions
diff --git a/lib/btowc.c b/lib/btowc.c
new file mode 100644
index 0000000..13ceab2
--- /dev/null
+++ b/lib/btowc.c
@@ -0,0 +1,47 @@
+/* Convert unibyte character to wide character.
+   Copyright (C) 2008, 2010-2023 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2008.
+
+   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/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <wchar.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+wint_t
+btowc (int c)
+{
+  if (c != EOF)
+    {
+      char buf[1];
+      wchar_t wc;
+
+      buf[0] = c;
+#if HAVE_MBRTOWC
+      mbstate_t state;
+      mbszero (&state);
+      size_t ret = mbrtowc (&wc, buf, 1, &state);
+      if (!(ret == (size_t)(-1) || ret == (size_t)(-2)))
+#else
+      if (mbtowc (&wc, buf, 1) >= 0)
+#endif
+        return wc;
+    }
+  return WEOF;
+}