Add initial `define' support for eqn(7).

This works by iterating over a simple list.  It's a slow, auditable
early implementation.  Data is read (the reading function will be
reused) then parsed, then the line re-run if remaining stuff exists.
Note this function isn't the same as mandoc_getarg(), as eqn(7) uses a
different system for reading quoted strings.
This doesn't actually use the defines.

1 files changed, 12 insertions, 2 deletions

diff --git a/libroff.h b/libroff.h
index b0e36385..4691c2d1 100644
--- a/libroff.h
+++ b/libroff.h
@@ -42,10 +42,19 @@ struct	tbl_node {
 	struct tbl_node	 *next;
 };
 
+struct	eqn_def {
+	char		 *key;
+	size_t		  keysz;
+	char		 *val;
+	size_t		  valsz;
+};
+
 struct	eqn_node {
+	struct eqn_def	 *defs;
+	size_t		  defsz;
 	struct eqn	  eqn;
-	struct eqn_node	 *next;
 	struct mparse	 *parse;
+	struct eqn_node  *next;
 };
 
 struct tbl_node	*tbl_alloc(int, int, struct mparse *);
@@ -62,7 +71,8 @@ void		 tbl_end(struct tbl_node *);
 struct eqn_node	*eqn_alloc(int, int, struct mparse *);
 void		 eqn_end(struct eqn_node *);
 void		 eqn_free(struct eqn_node *);
-enum rofferr 	 eqn_read(struct eqn_node **, int, const char *, int);
+enum rofferr 	 eqn_read(struct eqn_node **, int, 
+			const char *, int, int *);
 
 __END_DECLS