[monitoring-plugins] check_ntp_time: add cli option for output format

[Lorenz Kästle]

 Module: monitoring-plugins
 Branch: master
 Commit: 71e0d5e0732225e95affbacd1a08f2a8513d2802
 Author: Lorenz Kästle <12514511+RincewindsHat at users.noreply.github.com>
   Date: Wed Nov  5 12:19:20 2025 +0100
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=71e0d5e0

check_ntp_time: add cli option for output format

---

 plugins/check_ntp_time.c          | 22 ++++++++++++++++++++++
 plugins/check_ntp_time.d/config.h |  6 ++++++
 2 files changed, 28 insertions(+)

diff --git a/plugins/check_ntp_time.c b/plugins/check_ntp_time.c
index 7c3fc24d..602b6010 100644
--- a/plugins/check_ntp_time.c
+++ b/plugins/check_ntp_time.c
@@ -505,6 +505,11 @@ static offset_request_wrapper offset_request(const char *host, const char *port,
 }
 
 static check_ntp_time_config_wrapper process_arguments(int argc, char **argv) {
+
+	enum {
+		output_format_index = CHAR_MAX + 1,
+	};
+
 	static struct option longopts[] = {{"version", no_argument, 0, 'V'},
 									   {"help", no_argument, 0, 'h'},
 									   {"verbose", no_argument, 0, 'v'},
@@ -517,6 +522,7 @@ static check_ntp_time_config_wrapper process_arguments(int argc, char **argv) {
 									   {"timeout", required_argument, 0, 't'},
 									   {"hostname", required_argument, 0, 'H'},
 									   {"port", required_argument, 0, 'p'},
+									   {"output-format", required_argument, 0, output_format_index},
 									   {0, 0, 0, 0}};
 
 	if (argc < 2) {
@@ -536,6 +542,17 @@ static check_ntp_time_config_wrapper process_arguments(int argc, char **argv) {
 		}
 
 		switch (option_char) {
+		case output_format_index: {
+			parsed_output_format parser = mp_parse_output_format(optarg);
+			if (!parser.parsing_success) {
+				printf("Invalid output format: %s\n", optarg);
+				exit(STATE_UNKNOWN);
+			}
+
+			result.config.output_format_is_set = true;
+			result.config.output_format = parser.output_format;
+			break;
+		}
 		case 'h':
 			print_help();
 			exit(STATE_UNKNOWN);
@@ -623,6 +640,10 @@ int main(int argc, char *argv[]) {
 
 	const check_ntp_time_config config = tmp_config.config;
 
+	if (config.output_format_is_set) {
+		mp_set_format(config.output_format);
+	}
+
 	/* initialize alarm signal handling */
 	signal(SIGALRM, socket_timeout_alarm_handler);
 
@@ -687,6 +708,7 @@ void print_help(void) {
 	printf("    %s\n", _("Expected offset of the ntp server relative to local server (seconds)"));
 	printf(UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
 	printf(UT_VERBOSE);
+	printf(UT_OUTPUT_FORMAT);
 
 	printf("\n");
 	printf("%s\n", _("This plugin checks the clock offset between the local host and a"));
diff --git a/plugins/check_ntp_time.d/config.h b/plugins/check_ntp_time.d/config.h
index a62e4ceb..9bbd82aa 100644
--- a/plugins/check_ntp_time.d/config.h
+++ b/plugins/check_ntp_time.d/config.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "../../config.h"
+#include "output.h"
 #include "thresholds.h"
 #include <stddef.h>
 
@@ -12,6 +13,9 @@ typedef struct {
 	int time_offset;
 
 	mp_thresholds offset_thresholds;
+
+	bool output_format_is_set;
+	mp_output_format output_format;
 } check_ntp_time_config;
 
 check_ntp_time_config check_ntp_time_config_init() {
@@ -23,6 +27,8 @@ check_ntp_time_config check_ntp_time_config_init() {
 		.time_offset = 0,
 
 		.offset_thresholds = mp_thresholds_init(),
+
+		.output_format_is_set = false,
 	};
 
 	mp_range warning = mp_range_init();