From: Etienne Champetier <redacted>
Date: Fri, 11 Jul 2025 21:23:28 +0000 (-0400)
Subject: mwan3: add new readfile function to speedup variable read from file
X-Git-Url: http://git.99rst.org/?a=commitdiff_plain;h=f93b00fa686ad689a59484e4a2905c2fc9a6c875;p=openwrt-packages.git

mwan3: add new readfile function to speedup variable read from file

This is a preparation for adding an utility function readfile() to read
directly to a variable. Using '$(cat ...)' causes a fork/execve which is
extremely slow just to read '~2' chars.

(commit message from Florian Eckert)
Signed-off-by: Etienne Champetier <redacted>
---

diff --git a/net/mwan3/files/lib/mwan3/common.sh b/net/mwan3/files/lib/mwan3/common.sh
index ecd45026e..953cd6665 100644
--- a/net/mwan3/files/lib/mwan3/common.sh
+++ b/net/mwan3/files/lib/mwan3/common.sh
@@ -86,6 +86,12 @@ mwan3_get_src_ip()
 	export "$1=$_src_ip"
 }
 
+readfile() {
+	[ -f "$2" ] || return 1
+	# read returns 1 on EOF
+	read -d'\0' $1 <"$2" || :
+}
+
 mwan3_get_mwan3track_status()
 {
 	local track_ips pid