From 46852e99414458bee1f78e2c572e2d5d856011c9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gu=C3=B0ni=20M=C3=A1r=20Gilbert?= <gudni.m.g@gmail.com>
Date: Sat, 21 Jan 2023 16:33:35 +0000
Subject: [PATCH] M862: determine decimal through math rather than checking for
 null byte/pointer.

This way doesn't add any more flash memory.
Calculating the string length or checking for a null byte
will end up increasing flash consumption overall.
---
 Firmware/Marlin_main.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Firmware/Marlin_main.cpp b/Firmware/Marlin_main.cpp
index e0f9462a0..2af7038bf 100644
--- a/Firmware/Marlin_main.cpp
+++ b/Firmware/Marlin_main.cpp
@@ -8022,7 +8022,9 @@ Sigma_Exit:
     */
     case 862: // M862: print checking
     {
-        ClPrintChecking nCommand = static_cast<ClPrintChecking>(strtol(strchr_pointer+5, NULL, 10));
+        // Read the decimal by multiplying the float value by 10 e.g. 862.1 becomes 8621
+        // This method consumes less flash memory compared to checking the string length.
+        ClPrintChecking nCommand = static_cast<ClPrintChecking>((uint16_t)(code_value()*10) - 8620u);
         switch(nCommand)
                {
                case ClPrintChecking::_Nozzle:     // ~ .1