mdocml: Support the alternative syntax \C'uXXXX' for Unicode characters.

mdocml: Support the alternative syntax \C'uXXXX' for Unicode characters.

[schwarze]

Log Message:
-----------
Support the alternative syntax \C'uXXXX' for Unicode characters.
It is already documented in the Heirloom troff manual,
and groff handles it as well.

Bug reported by Bjarni Ingi Gislason <bjarniig at rhi dot hi dot is>
on <bug-groff at gnu dot org>.  Well, admittedly, that bug was reported 
against groff, but mandoc was even more broken than groff with respect
to this syntax...

Modified Files:
--------------
    mdocml:
        mandoc.c

Revision Data
-------------
Index: mandoc.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mandoc.c,v
retrieving revision 1.69
retrieving revision 1.70
diff -Lmandoc.c -Lmandoc.c -u -p -r1.69 -r1.70
--- mandoc.c
+++ mandoc.c
@@ -93,8 +93,11 @@ mandoc_escape(const char const **end, co
 	case ('C'):
 		if ('\'' != **start)
 			return(ESCAPE_ERROR);
-		gly = ESCAPE_SPECIAL;
 		*start = ++*end;
+		if ('u' == (*start)[0] && '\'' != (*start)[1])
+			gly = ESCAPE_UNICODE;
+		else
+			gly = ESCAPE_SPECIAL;
 		term = '\'';
 		break;
 
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