From 182d541fd660642544d66f122c61c7342ba89c21 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Tue, 29 Mar 2022 19:02:59 -0400
Subject: datetime: Get target (struct tm *) from caller

---
(limited to 'src')

diff --git a/src/datetime.c b/src/datetime.c
index 455e7dc..2c971a4 100644
--- a/src/datetime.c
+++ b/src/datetime.c
@@ -153,7 +153,8 @@ _datetime_normalize(struct tm *now_tm, struct tm *arg_tm, time_t *arg_sec)
 }
 
 int
-datetime_parse(struct tm *now_tm, const char *input, time_t *arg_sec)
+datetime_parse(struct tm *now_tm, const char *input,
+		struct tm *arg_tm, time_t *arg_sec)
 {
 	int        date_fmt_len;
 	int        time_fmt_len;
@@ -163,7 +164,6 @@ datetime_parse(struct tm *now_tm, const char *input, time_t *arg_sec)
 	size_t     d;
 	size_t     t;
 	char      *end;
-	struct tm  arg_tm;
 	time_t     sec;
 	bool       got;
 
@@ -185,11 +185,11 @@ datetime_parse(struct tm *now_tm, const char *input, time_t *arg_sec)
 	got = false;
 	for (t = 0; t < sizeof(FORMATS_TIME) / sizeof(FORMATS_TIME[0]); ++t) {
 		_datetime_buf_cpy_p(fmt_buf, FORMATS_TIME[t]);
-		_datetime_reset_tm(&arg_tm);
-		end = strptime(input, fmt_buf, &arg_tm);
+		_datetime_reset_tm(arg_tm);
+		end = strptime(input, fmt_buf, arg_tm);
 		if (end != NULL && *end == '\0') {
-			_datetime_normalize(now_tm, &arg_tm, arg_sec);
-			if (arg_tm.tm_year >= 0) {
+			_datetime_normalize(now_tm, arg_tm, arg_sec);
+			if (arg_tm->tm_year >= 0) {
 				free(fmt_buf);
 				return 0;
 			}
@@ -206,11 +206,11 @@ datetime_parse(struct tm *now_tm, const char *input, time_t *arg_sec)
 				++t) {
 			_datetime_buf_cpy_p(fmt_buf + date_fmt_len,
 					FORMATS_TIME[t]);
-			_datetime_reset_tm(&arg_tm);
-			end = strptime(input, fmt_buf, &arg_tm);
+			_datetime_reset_tm(arg_tm);
+			end = strptime(input, fmt_buf, arg_tm);
 			if (end != NULL && *end == '\0') {
-				_datetime_normalize(now_tm, &arg_tm, arg_sec);
-				if (arg_tm.tm_year >= 0) {
+				_datetime_normalize(now_tm, arg_tm, arg_sec);
+				if (arg_tm->tm_year >= 0) {
 					free(fmt_buf);
 					return 0;
 				}
@@ -228,11 +228,11 @@ datetime_parse(struct tm *now_tm, const char *input, time_t *arg_sec)
 			}
 			_datetime_buf_cpy_p(fmt_buf + time_fmt_len,
 					FORMATS_DATE[d]);
-			_datetime_reset_tm(&arg_tm);
-			end = strptime(input, fmt_buf, &arg_tm);
+			_datetime_reset_tm(arg_tm);
+			end = strptime(input, fmt_buf, arg_tm);
 			if (end != NULL && *end == '\0') {
-				_datetime_normalize(now_tm, &arg_tm, arg_sec);
-				if (arg_tm.tm_year >= 0) {
+				_datetime_normalize(now_tm, arg_tm, arg_sec);
+				if (arg_tm->tm_year >= 0) {
 					free(fmt_buf);
 					return 0;
 				}
@@ -243,11 +243,11 @@ datetime_parse(struct tm *now_tm, const char *input, time_t *arg_sec)
 	}
 	for (d = 0; d < sizeof(FORMATS_MISC) / sizeof(FORMATS_MISC[0]); ++d) {
 		_datetime_buf_cpy_p(fmt_buf, FORMATS_MISC[d]);
-		_datetime_reset_tm(&arg_tm);
-		end = strptime(input, fmt_buf, &arg_tm);
+		_datetime_reset_tm(arg_tm);
+		end = strptime(input, fmt_buf, arg_tm);
 		if (end != NULL && *end == '\0') {
-			_datetime_normalize(now_tm, &arg_tm, arg_sec);
-			if (arg_tm.tm_year >= 0) {
+			_datetime_normalize(now_tm, arg_tm, arg_sec);
+			if (arg_tm->tm_year >= 0) {
 				free(fmt_buf);
 				return 0;
 			}
diff --git a/src/datetime.h b/src/datetime.h
index e225b52..9de8799 100644
--- a/src/datetime.h
+++ b/src/datetime.h
@@ -23,7 +23,8 @@
 #include <time.h>
 
 int
-datetime_parse(struct tm *now_tm, const char *input, time_t *arg_sec);
+datetime_parse(struct tm *now_tm, const char *input,
+		struct tm *arg_tm, time_t *arg_sec);
 
 int
 datetime_strftime_date(const struct tm *tm, char **out, size_t *out_sz,
diff --git a/src/main.c b/src/main.c
index cdee4b7..93689d3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -196,6 +196,7 @@ main(int argc, char * const argv[])
 	char      *buf;
 	time_t     now;
 	struct tm *now_tm;
+	struct tm  arg_tm;
 	time_t     arg;
 	double     dif;
 
@@ -265,7 +266,7 @@ main(int argc, char * const argv[])
 		return EXIT_FAILURE;
 	}
 
-	if (datetime_parse(now_tm, buf, &arg) < 0) {
+	if (datetime_parse(now_tm, buf, &arg_tm, &arg) < 0) {
 		free(buf);
 		return EXIT_FAILURE;
 	}
--
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