From 1d3961e77175774ea3c952fd889e7b881939a203 Mon Sep 17 00:00:00 2001
From: Mitch Bradley <wmb@firmworks.com>
Date: Tue, 6 Oct 2020 09:55:17 -1000
Subject: [PATCH] Infer / at beginning of SD path name

The LocalFS path processing code already inserts
a / at the beginning of the path is one isn't
present.  This patch does the same for SD files.
---
 Grbl_Esp32/src/WebUI/WebSettings.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Grbl_Esp32/src/WebUI/WebSettings.cpp b/Grbl_Esp32/src/WebUI/WebSettings.cpp
index 8fe4a0b7..d08a5715 100644
--- a/Grbl_Esp32/src/WebUI/WebSettings.cpp
+++ b/Grbl_Esp32/src/WebUI/WebSettings.cpp
@@ -666,11 +666,14 @@ namespace WebUI {
 
 #ifdef ENABLE_SD_CARD
     static Error openSDFile(char* parameter) {
-        parameter = trim(parameter);
         if (*parameter == '\0') {
             webPrintln("Missing file name!");
             return Error::InvalidValue;
         }
+        String path = trim(parameter);
+        if (path[0] != '/') {
+            path = "/" + path;
+        }
         int8_t state = get_sd_state(true);
         if (state != SDCARD_IDLE) {
             if (state == SDCARD_NOT_PRESENT) {
@@ -685,7 +688,7 @@ namespace WebUI {
             webPrintln("Busy");
             return Error::IdleError;
         }
-        if (!openFile(SD, parameter)) {
+        if (!openFile(SD, path.c_str())) {
             report_status_message(Error::SdFailedRead, (espresponse) ? espresponse->client() : CLIENT_ALL);
             webPrintln("");
             return Error::SdFailedOpenFile;