Make errors more like dyalog:

* Use the same error numbers
* Rename ⎕THROW to ⎕SIGNAL
* Implement ⎕EN to inspect the last error code
* Implement ⎕EM to get a message from an error code

1 files changed, 9 insertions, 11 deletions

diff --git a/apl9.h b/apl9.h
index 88135c6..51cebfb 100644
--- a/apl9.h
+++ b/apl9.h
@@ -45,16 +45,14 @@ typedef enum
 
 typedef enum
 {
-	ESyntax = 1,
-	EParse,
-	EValue,
-	EDomain,
-	ERank,
-	EType,
-	ELength,
-	EIndex,
-	EShape,
-	ENotImplemented,
+	/* The numbers are the same as in dyalog */
+	ESyntax = 2,
+	EIndex = 3,
+	ERank = 4,
+	ELength = 5,
+	EValue = 6,
+	EDomain = 11,
+	ENotImplemented = 100, /* not in dyalog */
 } errorCodes;
 
 /* Data types */
@@ -330,6 +328,7 @@ Datum *quadnamedatum(QuadnameDef);
 /* error.c */
 ErrorGuard *newerrorguard(Array *, Statement *);
 void throwerror(Rune *, int);
+Rune *errorstr(int);
 
 /* inverse.c */
 Function inverse(Function);
@@ -479,6 +478,5 @@ extern int arrayalloccounts; /* memory.c */
 extern int datumalloccounts; /* memory.c */
 extern QuadnameDef quadnames[]; /* quadnames.c */
 extern int printprecision; /* print.c */
-extern Rune *errorstrs[]; /* error.c */
 extern int needsnewline; /* quadnames.c */
 extern int mainstacksize; /* concurrency.c */
\ No newline at end of file