From 1ab5387ff06d5aaa5d569e649b577df782a4eaf8 Mon Sep 17 00:00:00 2001
From: 0x1eef <0x1eef@protonmail.com>
Date: Sun, 27 Aug 2023 23:07:02 -0300
Subject: [PATCH] Fix cidr edge cases

---
 src/iscidraddr.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/iscidraddr.c b/src/iscidraddr.c
index ccd01ae..3d889bd 100644
--- a/src/iscidraddr.c
+++ b/src/iscidraddr.c
@@ -35,6 +35,10 @@ in_range(char buf[4], int min, int max)
   char *err;
   long r;
   errno = 0;
-  r = strtol(buf, &err, 10);
-  return *err == '\0' && errno == 0 && (r >= min && r <= max);
+  if (strnlen(buf, 1) == 0) {
+    return 0;
+  } else {
+    r = strtol(buf, &err, 10);
+    return *err == '\0' && errno == 0 && (r >= min && r <= max);
+  }
 }