Fix ban/exempt/invite masking not working with 10-char idents.

This was a regression in the maskaddr() code from eggdrop
in 7b83e9d675d which lost the 10-char limit support.

At least ratbox has a hardcoded USERLEN of 10.

doc/UPDATES.md

@@ -6,6 +6,7 @@
   * Use Linux's prctl(PR_SET_DUMPABLE) to disable core dumps and ptrace(2).
   * Use FreeBSD 10's procctl(PROC_TRACE_CTL) to disable core dumps and tracing.
   * Fix binary compat issue causing ptrace permission errors on Linux 3.4+
+  * Fix ban/exempt/invite masking not working with 10-char idents.
 
 # 1.4.6
   * Disable demo TCL support by default to prevent confusion during build.

src/misc.cc

@@ -267,6 +267,12 @@ void maskaddr(const char *s, char *nw, int type)
       *nw++ = '*';
       if (strchr("~+-^=", *u))
         u++; /* trim leading crap */
+      /*
+       * Take last 9 chars to avoid running up against 10-char limit for
+       * username on ratbox.  The older eggdrop code used this limit as well.
+       */
+      while (h - u > 9)
+        u++;
     }
     strncpy(nw, u, h - u);
     nw += h - u;