cmd: Add pause command
This command is being introduced with the goal of allowing user-friendly
"generic use case" U-Boot builds to pause until user input under some
situations.
The main use case would be when a boot failure happens, to pause until
the user has had time to acknowledge the current state.
Tested using:
make && ./u-boot -v -T -c 'ut lib lib_test_hush_pause'
Signed-off-by: Samuel Dionne-Riel <samuel@dionne-riel.com>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/cmd/pause.c b/cmd/pause.c
new file mode 100644
index 0000000..c97833c
--- /dev/null
+++ b/cmd/pause.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2021
+ * Samuel Dionne-Riel <samuel@dionne-riel.com>
+ */
+
+#include <command.h>
+#include <stdio.h>
+
+static int do_pause(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
+{
+ char *message = "Press any key to continue...";
+
+ if (argc == 2)
+ message = argv[1];
+
+ /* No newline, so it sticks to the bottom of the screen */
+ printf("%s", message);
+
+ /* Wait on "any" key... */
+ (void) getchar();
+
+ /* Since there was no newline, we need it now */
+ printf("\n");
+
+ return CMD_RET_SUCCESS;
+}
+
+U_BOOT_CMD(pause, 2, 1, do_pause,
+ "delay until user input",
+ "[prompt] - Wait until users presses any key. [prompt] can be used to customize the message.\n"
+);