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ape: implement altzone for tzset()

--- a/sys/include/ape/time.h

+++ b/sys/include/ape/time.h

@@ -67,6 +67,7 @@

 #ifdef _POSIX_SOURCE

 extern char *tzname[2];

 extern long timezone;

+extern long altzone;

 extern int daylight;

 #endif

--- a/sys/src/ape/lib/ap/posix/tzset.c

+++ b/sys/src/ape/lib/ap/posix/tzset.c

@@ -12,6 +12,7 @@

 	std, dst

 };

 long timezone;

+long altzone;

 int daylight;

 void

@@ -38,6 +39,7 @@

 	*p = 0;

 	strncpy(dst, q, sizeof dst);

 	q = p + 1;

+	altzone = - atoi(q);

 	daylight = 1;

 	free(env);

 	return;

@@ -46,6 +48,7 @@

 	strcpy(std, "GMT0");

 	dst[0] = '\0';

 	timezone = 0;

+	altzone = 0;

 	daylight = 0;

 	if(env != 0)

 		free(env);

@@ -54,6 +57,7 @@

 nodst:

 	dst[0] = '\0';

 	daylight = 0;

+	altzone = timezone;

 	free(env);

 	return;

 }