[PATCH 4/5] dmesg: implement dmesg -n

[Sascha Hauer <s.hauer@pengutronix.de>]

Under Linux dmesg -n can be used to set the console loglevel. Implement
the same for barebox.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 commands/dmesg.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/commands/dmesg.c b/commands/dmesg.c
index 00e5a159e0..953bdb2068 100644
--- a/commands/dmesg.c
+++ b/commands/dmesg.c
@@ -77,8 +77,9 @@ static int do_dmesg(int argc, char *argv[])
 	int opt, i;
 	int delete_buf = 0, emit = 0;
 	unsigned flags = 0, levels = 0;
+	char *set = NULL;
 
-	while ((opt = getopt(argc, argv, "ctderl:")) > 0) {
+	while ((opt = getopt(argc, argv, "ctderl:n:")) > 0) {
 		switch (opt) {
 		case 'c':
 			delete_buf = 1;
@@ -100,11 +101,25 @@ static int do_dmesg(int argc, char *argv[])
 		case 'r':
 			flags |= BAREBOX_LOG_PRINT_RAW | BAREBOX_LOG_PRINT_TIME;
 			break;
+		case 'n':
+			set = optarg;
+			break;
 		default:
 			return COMMAND_ERROR_USAGE;
 		}
 	}
 
+	if (set) {
+		int level = str_to_loglevel(set);
+
+		if (level < 0)
+			return COMMAND_ERROR;
+
+		barebox_loglevel = level;
+
+		return 0;
+	}
+
 	if (emit) {
 		char *buf;
 		int len = 0;
@@ -145,6 +160,7 @@ BAREBOX_CMD_HELP_OPT ("-c",		"Delete messages after printing them")
 BAREBOX_CMD_HELP_OPT ("-d",		"Show a time delta to the last message")
 BAREBOX_CMD_HELP_OPT ("-e <msg>",	"Emit a log message")
 BAREBOX_CMD_HELP_OPT ("-l <vdebug|debug|info|notice|warn|err|crit|alert|emerg>", "Restrict output to the given (comma-separated) list of levels")
+BAREBOX_CMD_HELP_OPT ("-n <loglevel>", "Set level at which printing of messages is done to the console")
 BAREBOX_CMD_HELP_OPT ("-r",		"Print timestamp and log-level prefixes.")
 BAREBOX_CMD_HELP_OPT ("-t",		"Show timestamp informations")
 BAREBOX_CMD_HELP_END
-- 
2.39.2