"Warn on unknown argument for .At and print it like [new] groff." (patch by Joerg Sonnenberger, ed. Kristaps)

Keep short-log of commits in index.sgml.
Document compatibility with new/old groff in mdoc.7.

4 files changed, 30 insertions, 7 deletions

diff --git a/index.sgml b/index.sgml
index 767caf18..efbae229 100644
--- a/index.sgml
+++ b/index.sgml
@@ -241,7 +241,12 @@
 						<TBODY>
 							<TR>
 								<TD VALIGN="top"><SPAN CLASS="date">xx-05-2010</SPAN></TD>
-								
+								Day 1 of Rostock hackathon: proper handling of quotations in tab-separated
+								column lists, finished patching of SYNOPSIS breaking (1.9.25), fixed pre-comment
+								white-space stripping, added end-of-sentence spacing to black partial-implicit
+								macros, relaxed column warnings, relaxed acceptence of bad standards arguments,
+								significant documentation of lists in <A HREF="mdoc.7.html">mdoc(7)</A>.
+								Version: <SPAN CLASS="rev">1.9.26</SPAN>.
 								<TD VALIGN="top">
 							</TR>
 							<TR>
diff --git a/mdoc.7 b/mdoc.7
index bb9f8cb0..3f25dff3 100644
--- a/mdoc.7
+++ b/mdoc.7
@@ -1960,6 +1960,12 @@ and
 .Sx \&Ex
 macros were stipulated only to occur in certain manual sections.
 mandoc does not have these restrictions.
+.It
+Newer groff and mandoc print
+.Qq AT&T UNIX
+prior to unknown arguments of
+.Sx \&At ;
+older groff did nothing.
 .El
 .Sh SEE ALSO
 .Xr mandoc 1 ,
diff --git a/mdoc_action.c b/mdoc_action.c
index 4739e0b6..9d2a3420 100644
--- a/mdoc_action.c
+++ b/mdoc_action.c
@@ -382,15 +382,27 @@ post_st(POST_ARGS)
 static int
 post_at(POST_ARGS)
 {
-	struct mdoc_node	*nn;
-	const char		*p;
+	struct mdoc_node *nn;
+	const char	 *p, *q;
+	char		 *buf;
+	size_t		  sz;
 
 	if (n->child) {
 		assert(MDOC_TEXT == n->child->type);
 		p = mdoc_a2att(n->child->string);
-		assert(p);
-		free(n->child->string);
-		n->child->string = mandoc_strdup(p);
+		if (p) {
+			free(n->child->string);
+			n->child->string = mandoc_strdup(p);
+		} else {
+			p = "AT&T UNIX ";
+			q = n->child->string;
+			sz = strlen(p) + strlen(q) + 1;
+			buf = mandoc_malloc(sz);
+			strlcpy(buf, p, sz);
+			strlcat(buf, q, sz);
+			free(n->child->string);
+			n->child->string = buf;
+		}
 		return(1);
 	}
 
diff --git a/mdoc_validate.c b/mdoc_validate.c
index ad33b1f4..a8c6b956 100644
--- a/mdoc_validate.c
+++ b/mdoc_validate.c
@@ -921,7 +921,7 @@ post_at(POST_ARGS)
 		return(mdoc_nerr(mdoc, mdoc->last, EATT));
 	if (mdoc_a2att(mdoc->last->child->string))
 		return(1);
-	return(mdoc_nerr(mdoc, mdoc->last, EATT));
+	return(mdoc_nwarn(mdoc, mdoc->last, EATT));
 }