From 75dbfb7166ab3d821528e0852f4a6d894c4f8536 Mon Sep 17 00:00:00 2001
From: 0x1eef <0x1eef@protonmail.com>
Date: Sun, 31 Mar 2024 06:25:52 -0300
Subject: [PATCH] Avoid indexing 'str' with a negative index

On OpenBSD - this can cause a crash.
---
 src/isinetaddr4.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/isinetaddr4.c b/src/isinetaddr4.c
index 20b955e..95f5adc 100644
--- a/src/isinetaddr4.c
+++ b/src/isinetaddr4.c
@@ -35,7 +35,7 @@ isinetaddr4(const char *str)
         digits++;
         if (!within_range(buf)) {
           return false;
-        } else if (str[i-1] == SEP) {
+        } else if (i > 0 && str[i-1] == SEP) {
           octets++;
         }
       }