summary refs log tree commit diff
diff options
context:
space:
mode:
-rw-r--r--ChangeLog2
-rw-r--r--Src/math.c5
2 files changed, 6 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog
index 315ecbc72..5e35f1d89 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2002-12-18  Peter Stephenson  <pws@csr.com>
 
+	* 18015: Src/math.c: empty math parse e.g. $(( )) acts like a zero.
+
 	* 18013: Src/builtin.c, Src/exec.c: let and (( ... )) should
 	return zero status on floating point only if the value compares
 	equal to 0 as a floating point number.
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)