Clean up eqn(7) error handling:

* When "define" fails, do not drop the whole equation.
* Free memory after "undef".
* Use standard mandoc error types instead of rolling our own.
* Delete obfuscating EQN_MSG() macro.
* Add function prototypes while here.

1 files changed, 0 insertions, 6 deletions

diff --git a/read.c b/read.c
index 0c068b9f..dcf9202b 100644
--- a/read.c
+++ b/read.c
@@ -178,12 +178,6 @@ static	const char * const	mandocerrs[MANDOCERR_MAX] = {
 
 	"generic error",
 
-	/* related to equations */
-	"unexpected equation scope closure",
-	"equation scope open on exit",
-	"overlapping equation scopes",
-	"unexpected end of equation",
-
 	/* related to tables */
 	"non-alphabetic character in tbl options",
 	"skipping unknown tbl option",