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Use 64-bit years

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This change makes strftime() go faster and makes it possible to format
timestamps through the big bang to most of the stelliferous era. India
has also been added as a timezone to most binaries. Since we were able
to change the struct tm abi, this makes cosmopolitan libc superior, to
just about everything else, when it comes to standing the test of time
This commit is contained in:
Justine Tunney 2022-05-11 17:48:50 -07:00
parent 2aebda7718
commit cfc3a953ae
13 changed files with 542 additions and 482 deletions
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47
test/libc/time/strftime_test.c
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@ -18,7 +18,10 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/limits.h"
#include "libc/log/check.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/testlib.h"
#include "libc/time/time.h"
@ -76,12 +79,6 @@ TEST(strftime_201, rfc822_GoogleStandardTime) {
FormatTime("%a, %d %b %y %T %z", localtime(&t)));
}
/* TEST(xiso8601, testModernity_TODO) { */
/* int64_t t = (1600 - 1970) * 31536000; */
/* ASSERT_STREQ("1600-01-01T00:00:00Z", */
/* FormatTime("%Y-%m-%dT%H:%M:%SZ", gmtime(&t))); */
/* } */
TEST(xiso8601, testAtLeastBetterThanTraditionalUnixLimit) {
int64_t t = 10737418235;
ASSERT_STREQ("2310-04-04T16:10:35Z",
@ -94,8 +91,36 @@ TEST(xiso8601, testSomethingHuge) {
FormatTime("%Y-%m-%dT%H:%M:%SZ", gmtime(&t)));
}
/* TEST(xiso8601, testMostOfStelliferousEra_TODO) { */
/* int64_t t = INT64_MAX; */
/* ASSERT_STREQ("somethinghuge-01-01T00:00:00Z", */
/* FormatTime("%Y-%m-%dT%H:%M:%SZ", gmtime(&t))); */
/* } */
// this requires 52 bit year
TEST(xiso8601, testBigBang) {
struct tm tm;
int64_t t = -13700000000L * 31536000L;
CHECK_NOTNULL(gmtime_r(&t, &tm));
ASSERT_STREQ("-13690902019-07-22T00:00:00Z",
FormatTime("%Y-%m-%dT%H:%M:%SZ", &tm));
}
// stelliferous era is 10**6 < n < 10**14 years (71-bit)
// we support up to approx. 10**11 yr after the big bang
TEST(xiso8601, testMostOfStelliferousEra) {
struct tm tm;
int64_t t = -13700000000L + 100000000000 /*000*/ * 31536000L;
CHECK_NOTNULL(gmtime_r(&t, &tm));
ASSERT_STREQ("99933607290-12-11T04:26:40Z",
FormatTime("%Y-%m-%dT%H:%M:%SZ", &tm));
}
const char *GmtimeFormatTime(void) {
struct tm tm;
int64_t t = -13700000000L * 31536000L;
CHECK_NOTNULL(gmtime_r(&t, &tm));
return FormatTime("%Y-%m-%dT%H:%M:%SZ", &tm);
}
BENCH(strftime, bench) {
struct tm tm;
int64_t t = -13700000000L * 31536000L;
CHECK_NOTNULL(gmtime_r(&t, &tm));
EZBENCH2("strftime", donothing, FormatTime("%Y-%m-%dT%H:%M:%SZ", &tm));
EZBENCH2("gmtime+strftime", donothing, GmtimeFormatTime());
}