Partial implementation of \h (horizontal line drawing function).

A full implementation would require access to output device properties
and state variables (both only available after the main parser has
finalized the parse tree) before numerical expansions in the roff
preprocessor (i.e., before the main parser is even started).

Not trying to pull that stunt right now because the static-width
implementation committed here is sufficient for tcl-style manual pages
and already more complicated than i would have suspected.

1 files changed, 12 insertions, 2 deletions

diff --git a/mandoc.c b/mandoc.c
index 03c25e0d..5f57801d 100644
--- a/mandoc.c
+++ b/mandoc.c
@@ -1,7 +1,7 @@
 /*	$Id$ */
 /*
  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2011-2015 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2011-2015, 2017 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
@@ -175,7 +175,17 @@ mandoc_escape(const char **end, const char **start, int *sz)
 				++*end;
 			return ESCAPE_ERROR;
 		}
-		gly = (*start)[-1] == 'h' ? ESCAPE_HORIZ : ESCAPE_IGNORE;
+		switch ((*start)[-1]) {
+		case 'h':
+			gly = ESCAPE_HORIZ;
+			break;
+		case 'l':
+			gly = ESCAPE_HLINE;
+			break;
+		default:
+			gly = ESCAPE_IGNORE;
+			break;
+		}
 		term = **start;
 		*start = ++*end;
 		break;