From b03e4621253ce98b939cbd371a902450b7a1be4c Mon Sep 17 00:00:00 2001
From: Stephen Heumann <stephenheumann@gmail.com>
Date: Fri, 17 Feb 2023 20:31:55 -0600
Subject: [PATCH] bsearch: return NULL without calling compare function if
 count==0.

This is explicitly required in C99 and later.
---
 stdlib.asm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/stdlib.asm b/stdlib.asm
index 0c30719..74baece 100644
--- a/stdlib.asm
+++ b/stdlib.asm
@@ -333,6 +333,10 @@ addr     equ   13                       address of array element of index test
 
          csubroutine (4:key,4:base,4:count,4:size,4:compar),16
 
+         lda   count                    if count is 0 then
+         ora   count+2
+         jeq   lb5                        just return a null pointer
+
          lda   compar                   patch the call address
          sta   >jsl+1
          lda   compar+1