Invalid read return value fix (#7817)

earlephilhower · web-flow · commit 34545a160da7 · 2021-01-08T20:08:36.000-08:00
Fixes #7814. Return 0, not MAXINT, when a read is called on a File without a backing instance of a SPIFFS/LittleFS/SD File.
diff --git a/cores/esp8266/FS.cpp b/cores/esp8266/FS.cpp
@@ -68,7 +68,7 @@ int File::read() {
 
 size_t File::read(uint8_t* buf, size_t size) {
     if (!_p)
-        return -1;
+        return 0;
 
     return _p->read(buf, size);
 }

Original file line number	Diff line number	Diff line change
`@@ -68,7 +68,7 @@ int File::read() {`
`68`	`68`
`69`	`69`	`size_t File::read(uint8_t* buf, size_t size) {`
`70`	`70`	`if (!_p)`
`71`		`- return -1;`
	`71`	`+ return 0;`
`72`	`72`
`73`	`73`	`return _p->read(buf, size);`
`74`	`74`	`}`