+/**
+ * Generate a valid IRC mask from "any" string given.
+ *
+ * @param Pattern Source string to generate an IRC mask for.
+ * @param mask Buffer to store the mask.
+ * @param len Size of the buffer.
+ */
+GLOBAL void
+Lists_MakeMask(const char *Pattern, char *mask, size_t len)
+{
+ char *excl, *at;
+
+ assert(Pattern != NULL);
+
+ excl = strchr(Pattern, '!');
+ at = strchr(Pattern, '@');
+
+ if (at && at < excl)
+ excl = NULL;
+
+ if (!at && !excl) {
+ /* Neither "!" nor "@" found: use string as nickname */
+ strlcpy(mask, Pattern, len - 5);
+ strlcat(mask, "!*@*", len);
+ } else if (!at && excl) {
+ /* Domain part is missing */
+ strlcpy(mask, Pattern, len - 3);
+ strlcat(mask, "@*", len);
+ } else if (at && !excl) {
+ /* User name is missing */
+ *at = '\0'; at++;
+ strlcpy(mask, Pattern, len - 5);
+ strlcat(mask, "!*@", len);
+ strlcat(mask, at, len);
+ } else {
+ /* All parts (nick, user and domain name) are given */
+ strlcpy(mask, Pattern, len);
+ }
+} /* Lists_MakeMask */