Shell: Handle aborting loops better

It's easy to get stuck in an infinite loop in the hush shell:

while true; do sleep 1; done

The 'sleep' command will check for ctrl-c with the ctrlc() function. This
will abort the sleep command. Hush then checks for ctrl-c again in the
loop. The ctrl-c in the buffer has already been eaten by the sleep
command, so the loop will continue.

With this patch we remember the presence of a ctrl-c character in a
variable instead of checking for a new character each time. The
variable must be resetted explicitly by calling ctrlc_handled() which
will be called by the shell in the outer loop.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/common.h b/include/common.h
index 11d26cb3db..723b9c706c 100644
--- a/include/common.h
+++ b/include/common.h
@@ -68,7 +68,9 @@ int	readline	(const char *prompt, char *buf, int len);
 long	get_ram_size  (volatile long *, long);
 
 /* common/console.c */
-int	ctrlc (void);
+int ctrlc(void);
+int arch_ctrlc(void);
+void ctrlc_handled(void);
 
 #ifdef ARCH_HAS_STACK_DUMP
 void dump_stack(void);