[PATCH v2] common: add custom autoboot_abort_key

[Johannes Schneider <johannes.schneider@leica-geosystems.com>]

Extend the autoboot_abort_key handling to alow custom
abort keys.

Allowed values to set in the env/nv/autoboot_abort_key
are any single ascii charater corresponding to the desired keyboard
key, or the strings 'any' or 'ctrl-c'

Signed-off-by: Johannes Schneider <johannes.schneider@leica-geosystems.com>
---
 common/startup.c | 53 ++++++++++++++++++++++++++++--------------------
 1 file changed, 31 insertions(+), 22 deletions(-)

diff --git a/common/startup.c b/common/startup.c
index 47b70a7..125bcf1 100644
--- a/common/startup.c
+++ b/common/startup.c
@@ -93,11 +93,7 @@ static int load_environment(void)
 }
 environment_initcall(load_environment);
 
-static int global_autoboot_abort_key;
-static const char * const global_autoboot_abort_keys[] = {
-	"any",
-	"ctrl-c",
-};
+static char *global_autoboot_abort_key;
 static int global_autoboot_timeout = 3;
 
 static const char * const global_autoboot_states[] = {
@@ -187,24 +183,22 @@ enum autoboot_state do_autoboot_countdown(void)
 	menu_exists = stat(MENUFILE, &s) == 0;
 
 	if (menu_exists) {
-		printf("\nHit m for menu or %s to stop autoboot: ",
-		       global_autoboot_abort_keys[global_autoboot_abort_key]);
 		abortkeys = "m";
-	} else {
-		printf("\nHit %s to stop autoboot: ",
-		       global_autoboot_abort_keys[global_autoboot_abort_key]);
 	}
 
-	switch (global_autoboot_abort_key) {
-	case 0:
+	if (!global_autoboot_abort_key ||
+	    !strcmp(global_autoboot_abort_key, "any"))
 		flags |= CONSOLE_COUNTDOWN_ANYKEY;
-		break;
-	case 1:
+	else if (!strcmp(global_autoboot_abort_key, "ctrl-c"))
 		flags |= CONSOLE_COUNTDOWN_CTRLC;
-		break;
-	default:
-		break;
-	}
+	else
+		abortkeys = xasprintf("%s%s",
+		                      (abortkeys)?abortkeys:"",
+		                      global_autoboot_abort_key);
+
+	printf("\nHit %s%s to stop autoboot: ",
+	       (menu_exists)?"m for menu or ":"",
+	       (global_autoboot_abort_key)?global_autoboot_abort_key:"any");
 
 	command_slice_release();
 	ret = console_countdown(global_autoboot_timeout, flags, abortkeys,
@@ -221,12 +215,27 @@ enum autoboot_state do_autoboot_countdown(void)
 	return autoboot_state;
 }
 
+static int autoboot_abort_key_set(struct param_d *p, void *priv)
+{
+	if (!strcmp(global_autoboot_abort_key, "any"))
+		return 0;
+	if (!strcmp(global_autoboot_abort_key, "ctrl-c"))
+		return 0;
+
+	if (strlen(global_autoboot_abort_key) != 1)
+		return -EINVAL;
+
+	return 0;
+}
+
 static int register_autoboot_vars(void)
 {
-	globalvar_add_simple_enum("autoboot_abort_key",
+	dev_add_param_string(&global_device,
+				  "autoboot_abort_key",
+				  autoboot_abort_key_set,
+				  NULL,
 				  &global_autoboot_abort_key,
-                                  global_autoboot_abort_keys,
-				  ARRAY_SIZE(global_autoboot_abort_keys));
+				  NULL);
 	globalvar_add_simple_int("autoboot_timeout",
 				 &global_autoboot_timeout, "%u");
 	globalvar_add_simple_enum("autoboot",
@@ -402,6 +411,6 @@ void shutdown_barebox(void)
 BAREBOX_MAGICVAR(global.autoboot,
                  "Autoboot state. Possible values: countdown (default), abort, menu, boot");
 BAREBOX_MAGICVAR(global.autoboot_abort_key,
-                 "Which key allows to interrupt autoboot. Possible values: any, ctrl-c");
+                 "Which key allows to interrupt autoboot. Possible values: 'any', 'ctrl-c' or any other single ascii character.");
 BAREBOX_MAGICVAR(global.autoboot_timeout,
                  "Timeout before autoboot starts in seconds");
-- 
2.43.0