Parse and ignore .hw (hyphenation points in words); this is safe because

we don't do hyphenation anyway, so there is no point in throwing an ERROR
when encountering .hw.
Real-world usage of the request found by naddy@ in sysutils/dwdiff(1).

2 files changed, 5 insertions, 0 deletions

diff --git a/roff.7 b/roff.7
index d84060e9..d54dc47a 100644
--- a/roff.7
+++ b/roff.7
@@ -644,6 +644,9 @@ This line-scoped request is intended to have one argument specifying
 the font family to be selected.
 It is a groff extension, and currently, it is ignored including its
 arguments, and the number of arguments is not checked.
+.Ss \&hw
+Specify hyphenation points in words.
+This line-scoped request is currently ignored.
 .Ss \&hy
 Set automatic hyphenation mode.
 This line-scoped request is currently ignored.
diff --git a/roff.c b/roff.c
index 352e5549..c8382154 100644
--- a/roff.c
+++ b/roff.c
@@ -47,6 +47,7 @@ enum	rofft {
 	ROFF_ds,
 	ROFF_el,
 	ROFF_fam,
+	ROFF_hw,
 	ROFF_hy,
 	ROFF_ie,
 	ROFF_if,
@@ -237,6 +238,7 @@ static	struct roffmac	 roffs[ROFF_MAX] = {
 	{ "ds", roff_ds, NULL, NULL, 0, NULL },
 	{ "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
 	{ "fam", roff_line_ignore, NULL, NULL, 0, NULL },
+	{ "hw", roff_line_ignore, NULL, NULL, 0, NULL },
 	{ "hy", roff_line_ignore, NULL, NULL, 0, NULL },
 	{ "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
 	{ "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },