From d000e66227cf15c97812d19f098c6fd8e2a00835 Mon Sep 17 00:00:00 2001
From: pankunull <panku_null@proton.me>
Date: Sat, 6 Sep 2025 00:03:36 +0200
Subject: added PROGRAM_NAME

---
 src/iptool.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/iptool.c b/src/iptool.c
index e940c52..105f7a8 100644
--- a/src/iptool.c
+++ b/src/iptool.c
@@ -15,6 +15,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#define PROGRAM_NAME "iptool"
+
 static uint32_t ip_to_u32(const char *ip_str)
 {
 	int o1, o2, o3, o4;
@@ -91,7 +93,7 @@ int main(int argc, char *argv[])
 	uint32_t total, usable;
 
 	if (argc < 3) {
-		fprintf(stderr, "Usage: %s <ip> <prefix>\n", argv[0]);
+		fprintf(stderr, "Usage: %s <ip> <prefix>\n", PROGRAM_NAME);
 		return 1;
 	}
 
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