altos/ao_stdio: use uint8_t for stdio index

[fw/altos] / src / kernel / ao.h

diff --git a/src/kernel/ao.h b/src/kernel/ao.h
index c1a8609c6526c2ba24e67dab76192e0bb8b24542..806b4946fecb57bf891826750b3b79f7a6884c53 100644 (file)
--- a/src/kernel/ao.h
+++ b/src/kernel/ao.h
@@ -724,8 +724,8 @@ struct ao_stdio {
 };
 
 extern struct ao_stdio ao_stdios[];
-extern int8_t ao_cur_stdio;
-extern int8_t ao_num_stdios;
+extern uint8_t ao_cur_stdio;
+extern uint8_t ao_num_stdios;
 
 void
 flush(void);
@@ -735,7 +735,7 @@ extern uint8_t ao_stdin_ready;
 uint8_t
 ao_echo(void);
 
-int8_t
+uint8_t
 ao_add_stdio(int (*pollchar)(void),
             void (*putchar)(char) ,
             void (*flush)(void));