From b363e1cae190e2f64f28694d5cc63c774c370a36 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Sat, 15 Aug 2020 10:40:11 -0400
Subject: add call to tzset()

---
 src/time/ctime.c     |  4 ++++
 src/time/localtime.c |  4 ++++
 src/time/mktime.c    |  4 ++++
 src/time/strftime.c  | 14 +++++++++++++-
 4 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/src/time/ctime.c b/src/time/ctime.c
index 5619e316..fd40655f 100644
--- a/src/time/ctime.c
+++ b/src/time/ctime.c
@@ -4,6 +4,10 @@
 
 char * ctime(const time_t * timer)
 {
+	#ifdef _POSIX_SOURCE
+	tzset();
+	#endif
+
 	return asctime(localtime(timer));
 }
 
diff --git a/src/time/localtime.c b/src/time/localtime.c
index 72040d00..ddfecab5 100644
--- a/src/time/localtime.c
+++ b/src/time/localtime.c
@@ -8,6 +8,10 @@ struct tm * localtime(const time_t * timer)
 	static struct tm tm = {0};
 	ASSERT_NONNULL(timer);
 
+	#ifdef _POSIX_SOURCE
+	tzset();
+	#endif
+
 	tm = *gmtime(timer);
 	/* TODO: adjust for timezone */
 
diff --git a/src/time/mktime.c b/src/time/mktime.c
index d19ad8d6..3b415b4c 100644
--- a/src/time/mktime.c
+++ b/src/time/mktime.c
@@ -10,6 +10,10 @@ time_t mktime(struct tm * timeptr)
 
 	ASSERT_NONNULL(timeptr);
 
+	#ifdef _POSIX_SOURCE
+	tzset();
+	#endif
+
 	while (timeptr->tm_sec < 0) {
 		timeptr->tm_min--;
 		timeptr->tm_sec += SEC_PER_MIN;
diff --git a/src/time/strftime.c b/src/time/strftime.c
index 4d3f78c8..c229e26d 100644
--- a/src/time/strftime.c
+++ b/src/time/strftime.c
@@ -16,6 +16,10 @@ size_t strftime(char * restrict s, size_t maxsize, const char * restrict format,
 	ASSERT_NONNULL(format);
 	ASSERT_NONNULL(timeptr);
 
+	#ifdef _POSIX_SOURCE
+	tzset();
+	#endif
+
 	for (i = 0; format[i] != '\0' && converted < maxsize; i++) {
 		if (format[i] != '%') {
 			s[converted++] = format[i];
@@ -48,6 +52,10 @@ size_t strftime(char * restrict s, size_t maxsize, const char * restrict format,
 			sprintf(buf, "%02d", timeptr->tm_mday);
 			break;
 
+		case 'e':
+			sprintf(buf, "%2d", timeptr->tm_mday);
+			break;
+
 		case 'H':
 			sprintf(buf, "%02d", timeptr->tm_hour);
 			break;
@@ -68,6 +76,10 @@ size_t strftime(char * restrict s, size_t maxsize, const char * restrict format,
 			sprintf(buf, "%02d", timeptr->tm_min);
 			break;
 
+		case 'n':
+			sprintf(buf, "\n");
+			break;
+
 		case 'p':
 			sprintf(buf, "%s", lc->lc_time.am_pm[timeptr->tm_hour < 12 ? 0 : 1]);
 			break;
@@ -117,8 +129,8 @@ size_t strftime(char * restrict s, size_t maxsize, const char * restrict format,
 			break;
 
 		default:
-			sprintf(buf, "UNDEFINED");
 			/* undefined behavior */
+			sprintf(buf, "-strftime(%%%c) is undefined-", format[i]);
 			break;
 		}
 
-- 
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