From a52e823967d2260681c9909b9f2c16b32b247814 Mon Sep 17 00:00:00 2001
From: Peter Barker <pbarker@barker.dropbear.id.au>
Date: Thu, 8 Jul 2021 17:10:23 +1000
Subject: [PATCH] AP_HAL_SITL: implement read(buf, length)

---
 libraries/AP_HAL_SITL/UARTDriver.cpp | 10 +++++++---
 libraries/AP_HAL_SITL/UARTDriver.h   |  1 +
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/libraries/AP_HAL_SITL/UARTDriver.cpp b/libraries/AP_HAL_SITL/UARTDriver.cpp
index 86e6d56ce3..e892c12538 100644
--- a/libraries/AP_HAL_SITL/UARTDriver.cpp
+++ b/libraries/AP_HAL_SITL/UARTDriver.cpp
@@ -180,14 +180,18 @@ uint32_t UARTDriver::txspace(void)
 
 int16_t UARTDriver::read(void)
 {
-    if (available() <= 0) {
+    uint8_t c;
+    if (read(&c, 1) == 0) {
         return -1;
     }
-    uint8_t c;
-    _readbuffer.read(&c, 1);
     return c;
 }
 
+ssize_t UARTDriver::read(uint8_t *buffer, uint16_t count)
+{
+    return _readbuffer.read(buffer, count);
+}
+
 bool UARTDriver::discard_input(void)
 {
     _readbuffer.clear();
diff --git a/libraries/AP_HAL_SITL/UARTDriver.h b/libraries/AP_HAL_SITL/UARTDriver.h
index 59053da486..c9126f9262 100644
--- a/libraries/AP_HAL_SITL/UARTDriver.h
+++ b/libraries/AP_HAL_SITL/UARTDriver.h
@@ -48,6 +48,7 @@ public:
     uint32_t available() override;
     uint32_t txspace() override;
     int16_t read() override;
+    ssize_t read(uint8_t *buffer, uint16_t count) override;
 
     bool discard_input() override;