Added handling of cardinal overflow

lang/m2/libm2/ChkCards.e

@@ -0,0 +1,39 @@
+#include <m2_traps.h>
+
+ mes 2,EM_WSIZE,EM_PSIZE
+
+ pro $addu,0
+ loc -1
+ lol 0
+ sbu EM_WSIZE
+ lol EM_WSIZE
+ cmu EM_WSIZE
+ zle *1
+ loc M2_UOVFL
+ trp
+1
+ lol 0
+ lol EM_WSIZE
+ adu EM_WSIZE
+ stl EM_WSIZE
+ ret 0
+ end 0
+
+ pro $mulu,0
+ lol 0
+ zeq *1
+ loc -1
+ lol 0
+ dvu EM_WSIZE
+ lol EM_WSIZE
+ cmu EM_WSIZE
+ zle *1
+ loc M2_UOVFL
+ trp
+1
+ lol 0
+ lol EM_WSIZE
+ mlu EM_WSIZE
+ stl EM_WSIZE
+ ret 0
+ end 0

lang/m2/libm2/LIST

@@ -31,6 +31,7 @@ store.c
 confarray.c
 load.c
 stackprio.c
+ChkCards.e
 EM.e
 rcku.e
 rcki.e

lang/m2/libm2/Traps.def

@@ -2,6 +2,12 @@ DEFINITION MODULE Traps;
 
   IMPORT EM;
 
+  CONST
+	ERRTOOLARGE =	64;	(* stack size of process too large *)
+	ERRTOOMANY =	65;	(* too many nested traps + handlers *)
+	ERRNORESULT =	66;	(* no RETURN from function procedure *)
+	ERRCARDOVFL =	67;	(* CARDINAL overflow *)
+
   TYPE	TrapHandler = EM.TrapHandler;
 
   PROCEDURE InstallTrapHandler(t: TrapHandler): TrapHandler;

lang/m2/libm2/catch.c

@@ -33,6 +33,7 @@ static struct errm {
 	{ M2_TOOLARGE,	"stack size of process too large"},
 	{ M2_TOOMANY,	"too many nested traps + handlers"},
 	{ M2_NORESULT,	"no RETURN from procedure function"},
+	{ M2_UOVFL,	"cardinal overflow"},
 	{ -1,		0}
 };
 

lang/m2/libm2/confarray.c

@@ -1,5 +1,13 @@
 #include <m2_traps.h>
 
+/*	Runtime handling of "value" conformant arrays.
+	The routine that accepts the conformant array parameter first calls
+	the routine new_stackptr. This routine computes a new stack pointer
+	for the calling routine and returns it. The new space on the stack is
+	large enough to store the array.
+	Then, it calls copy_array to do the copying.
+*/
+
 struct descr {
 	char *addr;
 	int low;
@@ -14,6 +22,9 @@ char *
 _new_stackptr(pdescr, a)
 	register struct descr *pdescr;
 {
+	/*	The parameter "a" is not used and not supplied.
+		It's address is the old stack-pointer.
+	*/
 	unsigned int size = (((pdescr->highminlow + 1) * pdescr->size +
 				(EM_WSIZE - 1)) & ~(EM_WSIZE - 1));
 
@@ -30,20 +41,19 @@ _new_stackptr(pdescr, a)
 }
 
 _copy_array(p, a)
-	register char *p;
+	register int *p;
 {
-	register char *q;
+	register int *q;
 	register unsigned int sz;
 	char dummy;
 
 	ppdescr--;
-	sz = (((*ppdescr)->highminlow + 1) * (*ppdescr)->size +
-		(EM_WSIZE -1)) & ~ (EM_WSIZE - 1);
+	sz = (((*ppdescr)->highminlow + 1) * (*ppdescr)->size) / EM_WSIZE;
 	
 	if ((char *) &a - (char *) &dummy > 0) {
-		(*ppdescr)->addr = q = (char *) &a;
+		(*ppdescr)->addr = (char *) (q = &a);
 	}
-	else	(*ppdescr)->addr = q = (char *) &a - sz;
+	else	(*ppdescr)->addr = (char *) (q = &a - sz);
 
 	while (sz--) *q++ = *p++;
 }