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@@ -0,0 +1,76 @@
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+#include <stdlib.h>
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+#include <stdio.h>
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+#include <time.h>
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+
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+/* We use this instead of memcmp because some broken C libraries
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+ * add additional nonstandard fields to struct tm... */
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+
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+int tm_cmp(struct tm tm1, struct tm tm2)
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+{
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+ return tm1.tm_sec != tm2.tm_sec ||
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+ tm1.tm_min != tm2.tm_min ||
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+ tm1.tm_hour != tm2.tm_hour ||
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+ tm1.tm_mday != tm2.tm_mday ||
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+ tm1.tm_mon != tm2.tm_mon ||
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+ tm1.tm_year != tm2.tm_year ||
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+ tm1.tm_wday != tm2.tm_wday ||
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+ tm1.tm_yday != tm2.tm_yday ||
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+ tm1.tm_isdst!= tm2.tm_isdst;
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+}
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+
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+char *tm_str(struct tm tm)
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+{
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+ static int i;
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+ static char b[4][64];
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+ i = (i+1)%4;
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+ snprintf(b[i], sizeof b[i],
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+ "s=%.2d m=%.2d h=%.2d mday=%.2d mon=%.2d year=%.4d wday=%d yday=%d isdst=%d",
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+ tm.tm_sec, tm.tm_min, tm.tm_hour,
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+ tm.tm_mday, tm.tm_mon, tm.tm_year,
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+ tm.tm_wday, tm.tm_yday, tm.tm_isdst);
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+ return b[i];
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+}
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+
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+#define TM(ss,mm,hh,md,mo,yr,wd,yd,dst) (struct tm){ \
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+ .tm_sec = ss, .tm_min = mm, .tm_hour = hh, \
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+ .tm_mday = md, .tm_mon = mo, .tm_year = yr, \
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+ .tm_wday = wd, .tm_yday = yd, .tm_isdst = dst }
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+
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+#define TM_EPOCH TM(0,0,0,1,0,70,4,0,0)
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+#define TM_Y2038_1S TM(7,14,3,19,0,138,2,18,0)
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+#define TM_Y2038 TM(8,14,3,19,0,138,2,18,0)
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+
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+#define TEST_TM(r,x,m) (!tm_cmp((r),(x)) || \
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+(printf(__FILE__ ":%d: %s failed:\n\tresult: %s\n\texpect: %s\n", __LINE__, \
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+m, tm_str((r)), tm_str((x))), err++, 0) )
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+
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+#define TEST(r, f, x, m) ( \
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+((r) = (f)) == (x) || \
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+(printf(__FILE__ ":%d: %s failed (" m ")\n", __LINE__, #f, r, x), err++, 0) )
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+
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+int main(void)
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+{
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+ struct tm tm, *tm_p;
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+ time_t t;
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+ int err=0;
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+
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+ putenv("TZ=GMT");
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+ tzset();
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+
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+ t=0; tm_p = gmtime(&t);
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+ TEST_TM(*tm_p, TM_EPOCH, "gmtime(0)");
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+
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+ tm = TM_Y2038_1S;
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+ t = mktime(&tm);
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+ tm = *(gmtime(&t));
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+ TEST_TM(*tm_p, TM_Y2038_1S, "mktime/gmtime(Y2038-1)");
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+
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+ tm = TM_Y2038;
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+ t = mktime(&tm);
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+ tm = *(gmtime(&t));
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+ TEST_TM(*tm_p, TM_Y2038, "mktime/gmtime(Y2038)");
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+
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+ /* FIXME: set a TZ var and check DST boundary conditions */
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+
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+ return err;
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+}
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