From 09db2e6c3788d7582b1862c3cab1617e49e2758e Mon Sep 17 00:00:00 2001
From: "Earle F. Philhower, III" <earlephilhower@yahoo.com>
Date: Sat, 11 Feb 2023 11:57:27 -0800
Subject: [PATCH] Apply SD.h fix from ESP8266 (#1171)

Pull in the portion of the change correcting the flag setting from
https://github.com/esp8266/Arduino/pull/8833
---
 libraries/SD/src/SD.h | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/libraries/SD/src/SD.h b/libraries/SD/src/SD.h
index 925d1ba00..fc1338d18 100644
--- a/libraries/SD/src/SD.h
+++ b/libraries/SD/src/SD.h
@@ -162,9 +162,23 @@ class SDClass {
 
 private:
     const char *getMode(uint8_t mode) {
-        bool read = (mode & O_READ) ? true : false;
-        bool write = (mode & O_WRITE) ? true : false;
-        bool append = (mode & O_APPEND) ? true : false;
+        bool read = false;
+        bool write = false;
+
+        switch (mode & O_ACCMODE) {
+        case O_RDONLY:
+            read = true;
+            break;
+        case O_WRONLY:
+            write = true;
+            break;
+        case O_RDWR:
+            read = true;
+            write = true;
+            break;
+        }
+        const bool append = (mode & O_APPEND) > 0;
+
         if (read & !write)           {
             return "r";
         } else if (!read &  write & !append) {