Add guard against overfolw

Liyou Zhou · Liyou Zhou · commit 8c43a18fb3db · 2016-02-01T16:36:44.000Z
diff --git a/source/mbed_platform.cpp b/source/mbed_platform.cpp
@@ -51,7 +51,11 @@ namespace test {
     }
 
     uint32_t inc_sleep_until_buf_tail(void) {
-        return ++sleep_until_buf_tail;
+        if (sleep_until_buf_tail < BUFFER_SIZE-1) {
+            return ++sleep_until_buf_tail;
+        } else {
+            return -1;
+        }
     }
 #endif
 }; // namespace test

Original file line number	Diff line number	Diff line change
`@@ -51,7 +51,11 @@ namespace test {`
`51`	`51`	`}`
`52`	`52`
`53`	`53`	`uint32_t inc_sleep_until_buf_tail(void) {`
`54`		`- return ++sleep_until_buf_tail;`
	`54`	`+ if (sleep_until_buf_tail < BUFFER_SIZE-1) {`
	`55`	`+ return ++sleep_until_buf_tail;`
	`56`	`+ } else {`
	`57`	`+ return -1;`
	`58`	`+ }`
`55`	`59`	`}`
`56`	`60`	`#endif`
`57`	`61`	`}; // namespace test`