Re: PATCH: += parameter assignments

[Peter Stephenson <pws@csr.com>]

Oliver wrote:
> > And the following can't be anything but a bug:
> 
> A bug maybe, but it has bugger all to do with the += code.
> 
> > (Previously
> 
> meaning 4.0.4 but 4.1.0-dev-1 behaves as now so the problem will have
> been introduced sometime before that. 15292 at a guess as that is the
> one in that time frame dealing with math.c.

pop() can now retrieve variables, so we need to check for errors when it
does.

Index: Src/math.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/math.c,v
retrieving revision 1.11
diff -u -r1.11 math.c
--- Src/math.c	2001/07/08 00:30:43	1.11
+++ Src/math.c	2002/01/14 13:02:22
@@ -497,7 +497,7 @@
     if (mv->val.type == MN_UNSET && !noget)
 	mv->val = getnparam(mv->lval);
     sp--;
-    return mv->val;
+    return errflag ? zero_mnumber : mv->val;
 }
 
 /**/
@@ -630,6 +630,8 @@
 	DPUTS(sp < 1, "BUG: math: not enough wallabies in outback.");
 	b = pop(0);
 	a = pop(what == EQ);
+	if (errflag)
+	    return;
 
 	if (tp & (OP_A2IO|OP_E2IO)) {
 	    /* coerce to integers */
@@ -856,6 +858,8 @@
 	c = pop(0);
 	b = pop(0);
 	a = pop(0);
+	if (errflag)
+	    return;
 	/* b and c can stay different types in this case. */
 	push(((a.type & MN_FLOAT) ? a.u.d : a.u.l) ? b : c, NULL, 0);
 	break;

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 392070


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