From e12e649d8449e7b18764381458162d80bdd80b09 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Sat, 15 Aug 2020 10:49:48 -0400
Subject: rough outline

---
 src/time/tzset.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/src/time/tzset.c b/src/time/tzset.c
index 51afb285..ad83b9e1 100644
--- a/src/time/tzset.c
+++ b/src/time/tzset.c
@@ -1,7 +1,42 @@
 #include <time.h>
+#include <stdlib.h>
+#include <string.h>
+#include "_time.h"
+
 void tzset(void)
 {
+	char buf[TZNAMELEN * 3]; /* one for std, one for dst, plus dst rule */
+	char *tzstr = getenv("TZ");
+	if (tzstr == NULL) {
+		tzstr = "UTC0";
+	}
+
+	if (strlen(tzstr) > sizeof(buf)) {
+		return;
+	}
+
+	tzname[0] = __time.stdtz;
+	tzname[1] = __time.dsttz;
+	strcpy(tzname[0], tzstr);
+
+	/* TODO:
+	no spaces in actual string
+
+	stdname hh[:mm[:ss]] [dstname [hh[:mm[:ss]]] [,start[/time],end[/time]]
+
+	stdname and dstname are either
+		all isalpha()
+		'<' [[:alnum:]+-]* '>'
+
+	hh may be prefixed by + or -
+	*/
+
+	#ifdef _XOPEN_SOURCE
+	/* TODO */
+	daylight = 0;
+	#endif
 }
+
 /*
 POSIX(1)
 */
-- 
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