9os

commit f40c7be4d1c9a95cd0726ccceb949afd1a03b6a9
parent e22b6bcefd83056bc346d8bb75e98c4699a173cd
Author: Dimitris Papastamos <dimitris.papastamos@arm.com>
Date:   Tue,  6 Nov 2018 11:49:50 +0000

[uart] Add uartread() and do some error checking for uartwrite()

Change-Id: I700b61629961b2e0156125e048efa4ddc1f6a91a
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>

Diffstat:
M
drivers/uart.c
 | 
14
+++++++++++++-
M
include/uart.h
 | 
1
+

2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/uart.c b/drivers/uart.c
@@ -85,12 +85,24 @@ uartputc(int c)
 }
 
 int
+uartread(char *buf, size_t siz)
+{
+	size_t i;
+
+	for (i = 0; i < siz; i++)
+		if ((buf[i] = uartgetc()) < 0)
+			return i;
+	return siz;
+}
+
+int
 uartwrite(const char *buf, size_t siz)
 {
 	size_t i;
 
 	for (i = 0; i < siz; i++)
-		uartputc(buf[i]);
+		if (uartputc(buf[i]) < 0)
+			return i;
 	flush();
 	return siz;
 }
diff --git a/include/uart.h b/include/uart.h
@@ -3,4 +3,5 @@
 extern void uartinit(unsigned clkrate, unsigned baudrate);
 extern int uartgetc(void);
 extern int uartputc(int c);
+extern int uartread(char *buf, size_t siz);
 extern int uartwrite(const char *buf, size_t siz);