From ea411774f017cd099fc77e67e673cdd51dd6aa38 Mon Sep 17 00:00:00 2001
From: Tim Ledbetter <timledbetter@gmail.com>
Date: Sat, 22 Jul 2023 15:49:22 +0100
Subject: [PATCH] truncate: Clamp file size to 0 when using the `-s` option

When using the `-s` option to reduce the size of a file, the file size
is now set to zero if the argument given would result in a file
size less than zero.

This matches the behavior of truncate on Linux and FreeBSD.
---
 Userland/Utilities/truncate.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Userland/Utilities/truncate.cpp b/Userland/Utilities/truncate.cpp
index 6967002bd0..adb20c9453 100644
--- a/Userland/Utilities/truncate.cpp
+++ b/Userland/Utilities/truncate.cpp
@@ -99,7 +99,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         size = stat.st_size + size;
         break;
     case OP_Shrink:
-        size = stat.st_size - size;
+        size = max(stat.st_size - size, 0);
         break;
     }