===================================================================
RCS file: /cvs/docbook2mdoc/parse.c,v
retrieving revision 1.7
retrieving revision 1.8
diff -u -p -r1.7 -r1.8
--- docbook2mdoc/parse.c	2019/03/28 20:41:33	1.7
+++ docbook2mdoc/parse.c	2019/04/02 13:11:09	1.8
@@ -1,4 +1,4 @@
-/* $Id: parse.c,v 1.7 2019/03/28 20:41:33 schwarze Exp $ */
+/* $Id: parse.c,v 1.8 2019/04/02 13:11:09 schwarze Exp $ */
 /*
  * Copyright (c) 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2019 Ingo Schwarze <schwarze@openbsd.org>
@@ -522,6 +522,7 @@ struct ptree *
 parse_file(struct parse *p, int fd, const char *fname)
 {
 	char		 b[4096];
+	char		*cp;
 	ssize_t		 rsz;	/* Return value from read(2). */
 	size_t		 rlen;  /* Number of bytes in b[]. */
 	size_t		 poff;  /* Parse offset in b[]. */
@@ -647,6 +648,29 @@ parse_file(struct parse *p, int fd, const char *fname)
 				if (advance(p, b, rlen, &pend, " >") &&
 				    rsz > 0)
 					break;
+				if (pend > poff + 3 &&
+				    strncmp(b + poff, "<!--", 4) == 0) {
+
+					/* Skip a comment. */
+
+					cp = strstr(b + pend - 2, "-->");
+					if (cp == NULL) {
+						if (rsz > 0) {
+							pend = rlen;
+							break;
+						}
+						cp = b + rlen;
+					} else
+						cp += 3;
+					while (b + pend < cp) {
+						if (b[++pend] == '\n') {
+							p->nline++;
+							p->ncol = 1;
+						} else
+							p->ncol++;
+					}
+					continue;
+				}
 				elem_end = 0;
 				if (b[pend] != '>')
 					in_tag = 1;