===================================================================
RCS file: /cvs/mandoc/read.c,v
retrieving revision 1.219
retrieving revision 1.220
diff -u -p -r1.219 -r1.220
--- mandoc/read.c	2020/04/24 12:02:33	1.219
+++ mandoc/read.c	2021/06/27 17:57:54	1.220
@@ -1,4 +1,4 @@
-/* $Id: read.c,v 1.219 2020/04/24 12:02:33 schwarze Exp $ */
+/* $Id: read.c,v 1.220 2021/06/27 17:57:54 schwarze Exp $ */
 /*
  * Copyright (c) 2010-2020 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
@@ -154,6 +154,7 @@ mparse_buf_r(struct mparse *curp, struct buf blk, size
 	struct buf	*firstln, *lastln, *thisln, *loop;
 	char		*cp;
 	size_t		 pos; /* byte number in the ln buffer */
+	size_t		 spos; /* at the start of the current line parse */
 	int		 line_result, result;
 	int		 of;
 	int		 lnn; /* line number in the real file */
@@ -180,6 +181,7 @@ mparse_buf_r(struct mparse *curp, struct buf blk, size
 			    curp->filenc & MPARSE_LATIN1)
 				curp->filenc = preconv_cue(&blk, i);
 		}
+		spos = pos;
 
 		while (i < blk.sz && (start || blk.buf[i] != '\0')) {
 
@@ -279,7 +281,8 @@ mparse_buf_r(struct mparse *curp, struct buf blk, size
 
 		of = 0;
 rerun:
-		line_result = roff_parseln(curp->roff, curp->line, &ln, &of);
+		line_result = roff_parseln(curp->roff, curp->line,
+		    &ln, &of, start && spos == 0 ? pos : 0);
 
 		/* Process options. */