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