HardwareSerial: Implement peek method

ajaybhargav · ajaybhargav · commit 82bfff4d43d1 · 2020-06-24T20:16:00.000+05:30
Signed-off-by: Ajay Bhargav &lt;contact@rickeyworld.info&gt;
diff --git a/cores/siwigsm/HardwareSerial.cpp b/cores/siwigsm/HardwareSerial.cpp
@@ -156,8 +156,12 @@ int HardwareSerial::availableForWrite(void)
 
 int HardwareSerial::peek(void)
 {
-	/* TODO */
-	return -1;
+	int peek_byte;
+
+	if (ioctl(_fd, TIOCPEEK, &peek_byte) < 0)
+		return -1;
+
+	return peek_byte;
 }
 
 int HardwareSerial::read(void)

Original file line number	Diff line number	Diff line change
`@@ -156,8 +156,12 @@ int HardwareSerial::availableForWrite(void)`
`156`	`156`
`157`	`157`	`int HardwareSerial::peek(void)`
`158`	`158`	`{`
`159`		`- /* TODO */`
`160`		`- return -1;`
	`159`	`+ int peek_byte;`
	`160`	`+`
	`161`	`+ if (ioctl(_fd, TIOCPEEK, &peek_byte) < 0)`
	`162`	`+ return -1;`
	`163`	`+`
	`164`	`+ return peek_byte;`
`161`	`165`	`}`
`162`	`166`
`163`	`167`	`int HardwareSerial::read(void)`