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

src/unicode.c

@@ -0,0 +1,81 @@
+/* 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/>
+*/
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "unicode.h"
+
+size_t Unicode_strlen(const word * str)
+{
+  size_t len;
+
+  len = 0;
+  while(str[len] != 0)
+    len++;
+  return len;
+}
+
+/// equivalent of strdup() for our Unicode strings
+word * Unicode_strdup(const word * str)
+{
+  size_t byte_size;
+  word * new_str;
+
+  byte_size = Unicode_strlen(str) * 2 + 2;
+  new_str = malloc(byte_size);
+  if (new_str != NULL)
+    memcpy(new_str, str, byte_size);
+  return new_str;
+}
+
+/// Compare an unicode string with a regular Latin1 string
+int Unicode_char_strcmp(const word * s1, const char * s2)
+{
+  const byte * str2 = (const byte *)s2;
+
+  while (*s1 == *str2)
+  {
+    if (*s1 == 0) return 0;
+    s1++;
+    str2++;
+  }
+  return (*s1 > *str2) ? 1 : -1;
+}
+
+/// Copy a regular Latin1 string to an unicode string
+void Unicode_char_strlcpy(word * dst, const char * src, size_t len)
+{
+  const byte * s = (const byte *)src;
+
+  if (len == 0)
+    return;
+  while (len > 1)
+  {
+    *dst = *s;
+    if (*s == '\0')
+      return;
+    dst++;
+    s++;
+    len--;
+  }
+  *dst = 0;
+}