mandoc: While doing delayed expansion of escape sequences in macro

[schwarze@mandoc.bsd.lv]

Log Message:
-----------
While doing delayed expansion of escape sequences in macro arguments,
correctly check for failure of the in-place expansion function.
If an argument not only does recursive delayed expansion
but infinitely recursive delayed expansion, this bug could
result in an ESCAPE_EXPAND assertion failure.

Thanks to Eric van Gyzen <vangyzen at FreeBSD> for finding this bug
by inspecting FreeBSD source code.

Modified Files:
--------------
    mandoc:
        roff.c

Revision Data
-------------
Index: roff.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/roff.c,v
retrieving revision 1.397
retrieving revision 1.398
diff -Lroff.c -Lroff.c -u -p -r1.397 -r1.398
--- roff.c
+++ roff.c
@@ -1689,7 +1689,7 @@ roff_getarg(struct roff *r, char **cpp, 
 	buf.buf = start;
 	buf.sz = strlen(start) + 1;
 	buf.next = NULL;
-	if (roff_expand(r, &buf, ln, 0, '\\') & ROFF_IGN) {
+	if (roff_expand(r, &buf, ln, 0, '\\') == ROFF_IGN) {
 		free(buf.buf);
 		buf.buf = mandoc_strdup("");
 	}
--
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