[PATCH] common: cli_hush: terminate all commands when Ctrl-C is pressed

[Shiji Yang]

Check Ctrl-C status before executing each command in the pipeline so
that the Ctrl-C can skip all subsequent commands. This should be the
default behavior of most shells.

Before the change:
```
=> echo start; while true; do echo loop; sleep 1; done; echo int; if true; then 
echo if; fi; echo stop
start
loop
loop    <-- Input Ctrl-C
int
if
stop
=>
```
After the change:
```
=> echo start; while true; do echo loop; sleep 1; done; echo int; if true; then 
echo if; fi; echo stop
start
loop
loop    <-- Input Ctrl-C
^C
=>
```

Signed-off-by: Shiji Yang <yangshij...@outlook.com>
---
 common/cli_hush.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/common/cli_hush.c b/common/cli_hush.c
index 7bd6943d3ed..6757a94a454 100644
--- a/common/cli_hush.c
+++ b/common/cli_hush.c
@@ -1792,16 +1792,15 @@ static int run_list_real(struct pipe *pi)
                }
        }
        for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
-               if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
-                       pi->r_mode == RES_FOR) {
 #ifdef __U_BOOT__
-                               /* check Ctrl-C */
-                               ctrlc();
-                               if ((had_ctrlc())) {
-                                       return 1;
-                               }
+               /* check Ctrl-C */
+               ctrlc();
+               if (had_ctrlc())
+                       return 1;
 #endif
-                               flag_restore = 0;
+               if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
+                   pi->r_mode == RES_FOR) {
+                       flag_restore = 0;
                                if (!rpipe) {
                                        flag_rep = 0;
                                        rpipe = pi;
@@ -2024,6 +2023,12 @@ static int run_list(struct pipe *pi)
         * In the long run that function can be merged with run_list_real,
         * but doing that now would hobble the debugging effort. */
        free_pipe_list(pi,0);
+
+       if (had_ctrlc()) {
+               printf("^C\n");
+               clear_ctrlc();
+       }
+
        return rcode;
 }
 
-- 
2.51.0