From 99c9b50bb491e8e19774458e82bc9540f6d223f2 Mon Sep 17 00:00:00 2001
From: Peter Stephenson <pws@users.sourceforge.net>
Date: Wed, 18 Dec 2002 18:07:49 +0000
Subject: 18015: empty math parse acts like zero

---
 Src/math.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'Src')

diff --git a/Src/math.c b/Src/math.c
index 766dff679..bc0669b7e 100644
--- a/Src/math.c
+++ b/Src/math.c
@@ -961,7 +961,7 @@ mathevall(char *s, int prek, char **ep)
     stack[0].val.u.l = 0;
     mathparse(prek);
     *ep = ptr;
-    DPUTS(!errflag && sp,
+    DPUTS(!errflag && sp > 0,
 	  "BUG: math: wallabies roaming too freely in outback");
 
     if (errflag) {
@@ -1084,6 +1084,9 @@ mathparse(int pc)
     if (errflag)
 	return;
     mtok = zzlex();
+    /* Handle empty input */
+    if (pc == TOPPREC && mtok == EOI)
+	return;
     checkunary(mtok, optr);
     while (prec[mtok] <= pc) {
 	if (errflag)
-- 
cgit 1.4.1