From 88c7e69ef39f66ef46a1eff5a306c1243690d7d6 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Wed, 16 Mar 2022 21:00:05 -0400
Subject: main: Add undocumented debugging option

Prints the number of seconds between the UNIX epoch and the specified
time.
---
diff --git a/configure.ac b/configure.ac
index 7c94fbd..011b7d5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,7 +40,7 @@ AC_CHECK_FUNCS(
 	[\
 		calloc difftime fprintf fputs free isspace localtime mktime \
 		printf realloc setvbuf sleep strerror strlen strftime strptime \
-		time
+		time timegm
 	],
 	[],
 	[funcs_missing=true])
diff --git a/src/main.c b/src/main.c
index bb4abb5..8740753 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021  P. J. McDermott
+ * Copyright (C) 2021, 2022  P. J. McDermott
  *
  * This file is part of @
  *
@@ -18,6 +18,7 @@
  */
 
 #include <errno.h>
+#include <inttypes.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -56,6 +57,18 @@ static const struct option LONGOPTS_[] = {
 };
 #endif
 
+static struct tm EPOCH_ = {
+	.tm_sec   = 0,
+	.tm_min   = 0,
+	.tm_hour  = 0,
+	.tm_mday  = 1,
+	.tm_mon   = 0,
+	.tm_year  = 70,
+	.tm_wday  = 4,
+	.tm_yday  = 0,
+	.tm_isdst = -1,
+};
+
 static void
 _print_usage(FILE *stream, const char *program_name)
 {
@@ -168,18 +181,20 @@ _concat_args(int argc, char * const argv[])
 int
 main(int argc, char * const argv[])
 {
+	bool    dbg;
 	int     opt;
 	char   *buf;
 	time_t  arg;
 	time_t  now;
 	double  dif;
 
+	dbg = false;
 	optind = 1;
 	opterr = 0;
 #if defined(HAVE_GETOPT_LONG) && HAVE_GETOPT_LONG
-	while ((opt = getopt_long(argc, argv, "FhV", LONGOPTS_, NULL)) > 0) {
+	while ((opt = getopt_long(argc, argv, "FhVd", LONGOPTS_, NULL)) > 0) {
 #else
-	while ((opt = getopt(argc, argv, "FhV")) > 0) {
+	while ((opt = getopt(argc, argv, "FhVd")) > 0) {
 #endif
 		switch (opt) {
 			case 'F':
@@ -191,6 +206,9 @@ main(int argc, char * const argv[])
 			case 'V':
 				_print_version();
 				return EXIT_SUCCESS;
+			case 'd':
+				dbg = true;
+				break;
 			default:
 				_print_usage(stderr, argv[0]);
 #if defined(HAVE_GETOPT_LONG) && HAVE_GETOPT_LONG
@@ -217,6 +235,13 @@ main(int argc, char * const argv[])
 	}
 	free(buf);
 
+	if (dbg == true) {
+		now = timegm(&EPOCH_);
+		dif = difftime(arg, now);
+		printf("%" PRId64 "\n", (int64_t) dif);
+		return EXIT_SUCCESS;
+	}
+
 	time(&now);
 	dif = difftime(arg, now);
 	if (dif >= 1000 * 24 * 60 * 60) {
--
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