===================================================================
RCS file: /cvs/mandoc/mandoc.c,v
retrieving revision 1.66
retrieving revision 1.69
diff -u -p -r1.66 -r1.69
--- mandoc/mandoc.c	2012/06/12 20:21:04	1.66
+++ mandoc/mandoc.c	2013/10/05 20:30:05	1.69
@@ -1,7 +1,7 @@
-/*	$Id: mandoc.c,v 1.66 2012/06/12 20:21:04 kristaps Exp $ */
+/*	$Id: mandoc.c,v 1.69 2013/10/05 20:30:05 schwarze Exp $ */
 /*
  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2011, 2012 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2011, 2012, 2013 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -40,7 +40,7 @@ static	char	*time2a(time_t);
 
 
 enum mandoc_esc
-mandoc_escape(const char **end, const char **start, int *sz)
+mandoc_escape(const char const **end, const char const **start, int *sz)
 {
 	const char	*local_start;
 	int		 local_sz;
@@ -296,13 +296,19 @@ mandoc_escape(const char **end, const char **start, in
 
 	switch (gly) {
 	case (ESCAPE_FONT):
-		/*
-		 * Pretend that the constant-width font modes are the
-		 * same as the regular font modes.
-		 */
-		if (2 == *sz && 'C' == **start) {
-			(*start)++;
-			(*sz)--;
+		if (2 == *sz) {
+			if ('C' == **start) {
+				/*
+				 * Treat constant-width font modes
+				 * just like regular font modes.
+				 */
+				(*start)++;
+				(*sz)--;
+			} else {
+				if ('B' == (*start)[0] && 'I' == (*start)[1])
+					gly = ESCAPE_FONTBI;
+				break;
+			}
 		} else if (1 != *sz)
 			break;
 
@@ -432,17 +438,35 @@ mandoc_getarg(struct mparse *parse, char **cpp, int ln
 	pairs = 0;
 	white = 0;
 	for (cp = start; '\0' != *cp; cp++) {
-		/* Move left after quoted quotes and escaped backslashes. */
+
+		/*
+		 * Move the following text left
+		 * after quoted quotes and after "\\" and "\t".
+		 */
 		if (pairs)
 			cp[-pairs] = cp[0];
+
 		if ('\\' == cp[0]) {
-			if ('\\' == cp[1]) {
-				/* Poor man's copy mode. */
+			/*
+			 * In copy mode, translate double to single
+			 * backslashes and backslash-t to literal tabs.
+			 */
+			switch (cp[1]) {
+			case ('t'):
+				cp[0] = '\t';
+				/* FALLTHROUGH */
+			case ('\\'):
 				pairs++;
 				cp++;
-			} else if (0 == quoted && ' ' == cp[1])
+				break;
+			case (' '):
 				/* Skip escaped blanks. */
-				cp++;
+				if (0 == quoted)
+					cp++;
+				break;
+			default:
+				break;
+			}
 		} else if (0 == quoted) {
 			if (' ' == cp[0]) {
 				/* Unescaped blanks end unquoted args. */