From 71e1df8f7d0e006b9be8d74be882d1814dceef6d Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@cvs.openbsd.org>
Date: Wed, 15 Mar 2017 11:29:51 +0000
Subject: Minimal support for deep linking into man(7) pages. As the man(7)
 language does not provide semantic markup, only .SH, .SS, and .UR become
 anchors for now.

---
 usr.bin/mandoc/html.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

(limited to 'usr.bin/mandoc/html.c')

diff --git a/usr.bin/mandoc/html.c b/usr.bin/mandoc/html.c
index c645cb71d3a..323888d3520 100644
--- a/usr.bin/mandoc/html.c
+++ b/usr.bin/mandoc/html.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: html.c,v 1.79 2017/03/14 01:34:57 schwarze Exp $ */
+/*	$OpenBSD: html.c,v 1.80 2017/03/15 11:29:50 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2011-2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -26,8 +26,9 @@
 #include <string.h>
 #include <unistd.h>
 
-#include "mandoc.h"
 #include "mandoc_aux.h"
+#include "mandoc.h"
+#include "roff.h"
 #include "out.h"
 #include "html.h"
 #include "manconf.h"
@@ -234,6 +235,28 @@ print_metaf(struct html *h, enum mandoc_esc deco)
 	}
 }
 
+char *
+html_make_id(const struct roff_node *n)
+{
+	const struct roff_node	*nch;
+	char			*buf, *cp;
+
+	for (nch = n->child; nch != NULL; nch = nch->next)
+		if (nch->type != ROFFT_TEXT)
+			return NULL;
+
+	buf = NULL;
+	deroff(&buf, n);
+
+	/* http://www.w3.org/TR/html5/dom.html#the-id-attribute */
+
+	for (cp = buf; *cp != '\0'; cp++)
+		if (*cp == ' ')
+			*cp = '_';
+
+	return buf;
+}
+
 int
 html_strlen(const char *cp)
 {
-- 
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