===================================================================
RCS file: /cvs/mandoc/roff.c,v
retrieving revision 1.383
retrieving revision 1.385
diff -u -p -r1.383 -r1.385
--- mandoc/roff.c	2022/04/24 17:40:22	1.383
+++ mandoc/roff.c	2022/04/30 11:32:42	1.385
@@ -1,4 +1,4 @@
-/* $Id: roff.c,v 1.383 2022/04/24 17:40:22 schwarze Exp $ */
+/* $Id: roff.c,v 1.385 2022/04/30 11:32:42 schwarze Exp $ */
 /*
  * Copyright (c) 2010-2015, 2017-2022 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2008-2012, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
@@ -227,6 +227,7 @@ static	int		 roff_line_ignore(ROFF_ARGS);
 static	void		 roff_man_alloc1(struct roff_man *);
 static	void		 roff_man_free1(struct roff_man *);
 static	int		 roff_manyarg(ROFF_ARGS);
+static	int		 roff_mc(ROFF_ARGS);
 static	int		 roff_noarg(ROFF_ARGS);
 static	int		 roff_nop(ROFF_ARGS);
 static	int		 roff_nr(ROFF_ARGS);
@@ -379,7 +380,7 @@ static	struct roffmac	 roffs[TOKEN_NONE] = {
 	{ roff_noarg, NULL, NULL, 0 },  /* fi */
 	{ roff_onearg, NULL, NULL, 0 },  /* ft */
 	{ roff_onearg, NULL, NULL, 0 },  /* ll */
-	{ roff_onearg, NULL, NULL, 0 },  /* mc */
+	{ roff_mc, NULL, NULL, 0 },  /* mc */
 	{ roff_noarg, NULL, NULL, 0 },  /* nf */
 	{ roff_onearg, NULL, NULL, 0 },  /* po */
 	{ roff_onearg, NULL, NULL, 0 },  /* rj */
@@ -2275,12 +2276,8 @@ roff_block_sub(ROFF_ARGS)
 	int		i, j;
 
 	/*
-	 * First check whether a custom macro exists at this level.  If
-	 * it does, then check against it.  This is some of groff's
-	 * stranger behaviours.  If we encountered a custom end-scope
-	 * tag and that tag also happens to be a "real" macro, then we
-	 * need to try interpreting it again as a real macro.  If it's
-	 * not, then return ignore.  Else continue.
+	 * If a custom end marker is a user-defined or predefined macro
+	 * or a request, interpret it.
 	 */
 
 	if (r->last->end) {
@@ -2306,20 +2303,17 @@ roff_block_sub(ROFF_ARGS)
 		}
 	}
 
-	/*
-	 * If we have no custom end-query or lookup failed, then try
-	 * pulling it out of the hashtable.
-	 */
+	/* Handle the standard end marker. */
 
 	t = roff_parse(r, buf->buf, &pos, ln, ppos);
+	if (t == ROFF_cblock)
+		return roff_cblock(r, t, buf, ln, ppos, pos, offs);
 
-	if (t != ROFF_cblock) {
-		if (tok != ROFF_ig)
-			roff_setstr(r, r->last->name, buf->buf + ppos, 2);
-		return ROFF_IGN;
-	}
+	/* Not an end marker, so append the line to the block. */
 
-	return (*roffs[t].proc)(r, t, buf, ln, ppos, pos, offs);
+	if (tok != ROFF_ig)
+		roff_setstr(r, r->last->name, buf->buf + ppos, 2);
+	return ROFF_IGN;
 }
 
 static int
@@ -3728,6 +3722,54 @@ roff_eo(ROFF_ARGS)
 	if (buf->buf[pos] != '\0')
 		mandoc_msg(MANDOCERR_ARG_SKIP,
 		    ln, pos, "eo %s", buf->buf + pos);
+	return ROFF_IGN;
+}
+
+static int
+roff_mc(ROFF_ARGS)
+{
+	struct roff_node	*n;
+	char			*cp;
+
+	/* Parse the first argument. */
+
+	cp = buf->buf + pos;
+	if (*cp != '\0')
+		cp++;
+	if (buf->buf[pos] == '\\') {
+		switch (mandoc_escape((const char **)&cp, NULL, NULL)) {
+		case ESCAPE_SPECIAL:
+		case ESCAPE_UNICODE:
+		case ESCAPE_NUMBERED:
+			break;
+		default:
+			*cp = '\0';
+			mandoc_msg(MANDOCERR_MC_ESC, ln, pos,
+			    "mc %s", buf->buf + pos);
+			buf->buf[pos] = '\0';
+			break;
+		}
+	}
+
+	/* Ignore additional arguments. */
+
+	while (*cp == ' ')
+		*cp++ = '\0';
+	if (*cp != '\0') {
+		mandoc_msg(MANDOCERR_MC_DIST, ln, (int)(cp - buf->buf),
+		    "mc ... %s", cp);
+		*cp = '\0';
+	}
+
+	/* Create the .mc node. */
+
+	roff_elem_alloc(r->man, ln, ppos, tok);
+	n = r->man->last;
+	if (buf->buf[pos] != '\0')
+		roff_word_alloc(r->man, ln, pos, buf->buf + pos);
+	n->flags |= NODE_LINE | NODE_VALID | NODE_ENDED;
+	r->man->last = n;
+	r->man->next = ROFF_NEXT_SIBLING;
 	return ROFF_IGN;
 }