From 96fcc5e1a559a305aa524a27f63591cd3e4488a7 Mon Sep 17 00:00:00 2001
From: fgiudice98 <35608074+fgiudice98@users.noreply.github.com>
Date: Wed, 15 Dec 2021 16:03:01 +0100
Subject: [PATCH] M23 fix

Fixes M23 not able to open a file in a folder

Thanks to [this github comment](https://github.com/MarlinFirmware/Marlin/issues/19109#issuecomment-680196123)
---
 Marlin/Marlin_main.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 8b22aeeaf..4546e8667 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -7643,12 +7643,20 @@ inline void gcode_M17() {
    * M23: Open a file
    */
   inline void gcode_M23() {
+    byte filenameSlash = 0;
     #if ENABLED(POWER_LOSS_RECOVERY)
       card.removeJobRecoveryFile();
     #endif
     // Simplify3D includes the size, so zero out all spaces (#7227)
-    for (char *fn = parser.string_arg; *fn; ++fn) if (*fn == ' ') *fn = '\0';
-    card.openFile(parser.string_arg, true);
+    for (char *fn = parser.string_arg; *fn; ++fn){
+      if (*fn == ' ') *fn = '\0';
+      if (*fn == '/') filenameSlash += 1;
+    }
+    if (filenameSlash > 1){
+      card.openFile(&parser.string_arg[1], true);
+    } else {
+      card.openFile(parser.string_arg, true);      
+    }
   }
 
   /**