Add the ability to print unicode characters in addition to "Latin1" ones

src/unicode.h

@@ -0,0 +1,39 @@
+/* vim:expandtab:ts=2 sw=2:
+*/
+/*  Grafx2 - The Ultimate 256-color bitmap paint program
+
+    Copyright 2018 Thomas Bernard
+    Copyright 1996-2001 Sunset Design (Guillaume Dorme & Karl Maritaud)
+
+    Grafx2 is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License
+    as published by the Free Software Foundation; version 2
+    of the License.
+
+    Grafx2 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Grafx2; if not, see <http://www.gnu.org/licenses/>
+*/
+#ifndef UNICODE_H_INCLUDED
+#define UNICODE_H_INCLUDED
+
+#include "struct.h"
+
+/// equivalent of strlen() for out Unicode strings
+/// return the number of characters (words), so there is twice as much bytes
+size_t Unicode_strlen(const word * str);
+
+/// equivalent of strdup() for our Unicode strings
+word * Unicode_strdup(const word * str);
+
+/// Compare an unicode string with a regular Latin1 string
+int Unicode_char_strcmp(const word * s1, const char * s2);
+
+/// Copy a regular Latin1 string to an unicode string
+void Unicode_char_strlcpy(word * dst, const char * src, size_t len);
+
+#endif