move Get_unicode_filename() to io.c. correclty select last directory in

filesel

src/io.c

@@ -693,6 +693,69 @@ void Get_full_filename(char * output_name, const char * file_name, const char *
   strcat(output_name,file_name);
 }
 
+/**
+ * Convert a file name to unicode characters
+ *
+ * @param filename_unicode the output buffer of MAX_PATH_CHARACTERS wide characters
+ * @param filename the input file name
+ * @param directory the input file directory
+ * @return 0 if no conversion has taken place.
+ * @return 1 if the unicode filename has been retrieved
+ */
+int Get_Unicode_Filename(word * filename_unicode, const char * filename, const char * directory)
+{
+#if defined(WIN32)
+  int i = 0, j = 0;
+  WCHAR shortPath[MAX_PATH_CHARACTERS];
+  WCHAR longPath[MAX_PATH_CHARACTERS];
+
+  // copy the full path to a wide character buffer :
+  while (directory[0] != '\0')
+    shortPath[i++] = *directory++;
+  if (i > 0 && shortPath[i-1] != '\\')   // add path separator only if it is missing
+    shortPath[i++] = '\\';
+  while (filename[0] != '\0')
+    shortPath[i++] = *filename++;
+  shortPath[i++] = 0;
+  if (GetLongPathNameW(shortPath, longPath, MAX_PATH_CHARACTERS) == 0)
+    return 0;
+  i = 0;
+  while (longPath[j] != 0)
+  {
+    if (longPath[j] == '\\')
+      i = 0;
+    else
+      filename_unicode[i++] = longPath[j];
+    j++;
+  }
+  filename_unicode[i++] = 0;
+  return 1;
+#elif defined(ENABLE_FILENAMES_ICONV)
+  char * input = (char *)filename;
+  size_t inbytesleft = strlen(filename);
+  char * output = (char *)filename_unicode;
+  size_t outbytesleft = (MAX_PATH_CHARACTERS - 1) * 2;
+  (void)directory;  // unused
+  if (cd_utf16 != (iconv_t)-1)
+  {
+    size_t r = iconv(cd_utf16, &input, &inbytesleft, &output, &outbytesleft);
+    if (r != (size_t)-1)
+    {
+      output[0] = '\0';
+      output[1] = '\0';
+      return 1;
+    }
+  }
+  return 0;
+#else
+  (void)filename_unicode;
+  (void)filename;
+  (void)directory;
+  // not implemented
+  return 0;
+#endif
+}
+
 /// Lock file used to prevent several instances of grafx2 from harming each others' backups
 #ifdef WIN32
 HANDLE Lock_file_handle = INVALID_HANDLE_VALUE;