Complete eqn.7 parsing. Features all productions from the original 1975

CACM paper in an LR(1) parse (1 -> eqn_rewind()).  Right now the code is
a little jungly, but will clear up as I consolidate parse components.
The AST structure will also be cleaned up, as right now it's pretty ad
hoc (this won't change the parse itself).  I added the mandoc_strndup()
function will here.

1 files changed, 3 insertions, 0 deletions

diff --git a/read.c b/read.c
index 9984cc3c..eee2c6f1 100644
--- a/read.c
+++ b/read.c
@@ -156,6 +156,9 @@ static	const char * const	mandocerrs[MANDOCERR_MAX] = {
 	"too many nested equation defines",
 	"unexpected equation scope closure",
 	"equation scope open on exit",
+	"overlapping equation scopes",
+	"unexpected end of equation",
+	"equation syntax error",
 
 	/* related to tables */
 	"bad table syntax",