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time.c
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time.c
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/**********************************************************************
time.c -
$Author$
created at: Tue Dec 28 14:31:59 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
#define _DEFAULT_SOURCE
#define _BSD_SOURCE
#include "internal.h"
#include <sys/types.h>
#include <time.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <float.h>
#include <math.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#if defined(HAVE_SYS_TIME_H)
#include <sys/time.h>
#endif
#include "timev.h"
#include "id.h"
static ID id_divmod, id_submicro, id_nano_num, id_nano_den, id_offset, id_zone;
static ID id_quo, id_div;
static ID id_nanosecond, id_microsecond, id_millisecond, id_nsec, id_usec;
#define NDIV(x,y) (-(-((x)+1)/(y))-1)
#define NMOD(x,y) ((y)-(-((x)+1)%(y))-1)
#define DIV(n,d) ((n)<0 ? NDIV((n),(d)) : (n)/(d))
#define MOD(n,d) ((n)<0 ? NMOD((n),(d)) : (n)%(d))
#define VTM_WDAY_INITVAL (7)
#define VTM_ISDST_INITVAL (3)
#define TO_GMT_INITVAL (3)
static int
eq(VALUE x, VALUE y)
{
if (FIXNUM_P(x) && FIXNUM_P(y)) {
return x == y;
}
return RTEST(rb_funcall(x, idEq, 1, y));
}
static int
cmp(VALUE x, VALUE y)
{
if (FIXNUM_P(x) && FIXNUM_P(y)) {
if ((long)x < (long)y)
return -1;
if ((long)x > (long)y)
return 1;
return 0;
}
if (RB_TYPE_P(x, T_BIGNUM)) return FIX2INT(rb_big_cmp(x, y));
return rb_cmpint(rb_funcall(x, idCmp, 1, y), x, y);
}
#define ne(x,y) (!eq((x),(y)))
#define lt(x,y) (cmp((x),(y)) < 0)
#define gt(x,y) (cmp((x),(y)) > 0)
#define le(x,y) (cmp((x),(y)) <= 0)
#define ge(x,y) (cmp((x),(y)) >= 0)
static VALUE
addv(VALUE x, VALUE y)
{
if (FIXNUM_P(x) && FIXNUM_P(y)) {
return LONG2NUM(FIX2LONG(x) + FIX2LONG(y));
}
if (RB_TYPE_P(x, T_BIGNUM)) return rb_big_plus(x, y);
return rb_funcall(x, '+', 1, y);
}
static VALUE
subv(VALUE x, VALUE y)
{
if (FIXNUM_P(x) && FIXNUM_P(y)) {
return LONG2NUM(FIX2LONG(x) - FIX2LONG(y));
}
if (RB_TYPE_P(x, T_BIGNUM)) return rb_big_minus(x, y);
return rb_funcall(x, '-', 1, y);
}
static VALUE
mulv(VALUE x, VALUE y)
{
if (FIXNUM_P(x) && FIXNUM_P(y)) {
return rb_fix_mul_fix(x, y);
}
if (RB_TYPE_P(x, T_BIGNUM))
return rb_big_mul(x, y);
return rb_funcall(x, '*', 1, y);
}
static VALUE
divv(VALUE x, VALUE y)
{
if (FIXNUM_P(x) && FIXNUM_P(y)) {
return rb_fix_div_fix(x, y);
}
if (RB_TYPE_P(x, T_BIGNUM))
return rb_big_div(x, y);
return rb_funcall(x, id_div, 1, y);
}
static VALUE
modv(VALUE x, VALUE y)
{
if (FIXNUM_P(y)) {
if (FIX2LONG(y) == 0) rb_num_zerodiv();
if (FIXNUM_P(x)) return rb_fix_mod_fix(x, y);
}
if (RB_TYPE_P(x, T_BIGNUM)) return rb_big_modulo(x, y);
return rb_funcall(x, '%', 1, y);
}
#define neg(x) (subv(INT2FIX(0), (x)))
static VALUE
quov(VALUE x, VALUE y)
{
VALUE ret;
if (FIXNUM_P(x) && FIXNUM_P(y)) {
long a, b, c;
a = FIX2LONG(x);
b = FIX2LONG(y);
if (b == 0) rb_num_zerodiv();
if (a == FIXNUM_MIN && b == -1) return LONG2NUM(-a);
c = a / b;
if (c * b == a) {
return LONG2FIX(c);
}
}
ret = rb_numeric_quo(x, y);
if (RB_TYPE_P(ret, T_RATIONAL) &&
RRATIONAL(ret)->den == INT2FIX(1)) {
ret = RRATIONAL(ret)->num;
}
return ret;
}
#define mulquov(x,y,z) (((y) == (z)) ? (x) : quov(mulv((x),(y)),(z)))
static void
divmodv(VALUE n, VALUE d, VALUE *q, VALUE *r)
{
VALUE tmp, ary;
if (FIXNUM_P(d)) {
if (FIX2LONG(d) == 0) rb_num_zerodiv();
if (FIXNUM_P(n)) {
rb_fix_divmod_fix(n, d, q, r);
return;
}
}
tmp = rb_funcall(n, id_divmod, 1, d);
ary = rb_check_array_type(tmp);
if (NIL_P(ary)) {
rb_raise(rb_eTypeError, "unexpected divmod result: into %"PRIsVALUE,
rb_obj_class(tmp));
}
*q = rb_ary_entry(ary, 0);
*r = rb_ary_entry(ary, 1);
}
#if SIZEOF_LONG == 8
# define INT64toNUM(x) LONG2NUM(x)
#elif defined(HAVE_LONG_LONG) && SIZEOF_LONG_LONG == 8
# define INT64toNUM(x) LL2NUM(x)
#endif
#if defined(HAVE_UINT64_T) && SIZEOF_LONG*2 <= SIZEOF_UINT64_T
typedef uint64_t uwideint_t;
typedef int64_t wideint_t;
typedef uint64_t WIDEVALUE;
typedef int64_t SIGNED_WIDEVALUE;
# define WIDEVALUE_IS_WIDER 1
# define UWIDEINT_MAX UINT64_MAX
# define WIDEINT_MAX INT64_MAX
# define WIDEINT_MIN INT64_MIN
# define FIXWINT_P(tv) ((tv) & 1)
# define FIXWVtoINT64(tv) RSHIFT((SIGNED_WIDEVALUE)(tv), 1)
# define INT64toFIXWV(wi) ((WIDEVALUE)((SIGNED_WIDEVALUE)(wi) << 1 | FIXNUM_FLAG))
# define FIXWV_MAX (((int64_t)1 << 62) - 1)
# define FIXWV_MIN (-((int64_t)1 << 62))
# define FIXWVABLE(wi) (POSFIXWVABLE(wi) && NEGFIXWVABLE(wi))
# define WINT2FIXWV(i) WIDEVAL_WRAP(INT64toFIXWV(i))
# define FIXWV2WINT(w) FIXWVtoINT64(WIDEVAL_GET(w))
#else
typedef unsigned long uwideint_t;
typedef long wideint_t;
typedef VALUE WIDEVALUE;
typedef SIGNED_VALUE SIGNED_WIDEVALUE;
# define WIDEVALUE_IS_WIDER 0
# define UWIDEINT_MAX ULONG_MAX
# define WIDEINT_MAX LONG_MAX
# define WIDEINT_MIN LONG_MIN
# define FIXWINT_P(v) FIXNUM_P(v)
# define FIXWV_MAX FIXNUM_MAX
# define FIXWV_MIN FIXNUM_MIN
# define FIXWVABLE(i) FIXABLE(i)
# define WINT2FIXWV(i) WIDEVAL_WRAP(LONG2FIX(i))
# define FIXWV2WINT(w) FIX2LONG(WIDEVAL_GET(w))
#endif
#define POSFIXWVABLE(wi) ((wi) < FIXWV_MAX+1)
#define NEGFIXWVABLE(wi) ((wi) >= FIXWV_MIN)
#define FIXWV_P(w) FIXWINT_P(WIDEVAL_GET(w))
#define MUL_OVERFLOW_FIXWV_P(a, b) MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, FIXWV_MIN, FIXWV_MAX)
/* #define STRUCT_WIDEVAL */
#ifdef STRUCT_WIDEVAL
/* for type checking */
typedef struct {
WIDEVALUE value;
} wideval_t;
static inline wideval_t WIDEVAL_WRAP(WIDEVALUE v) { wideval_t w = { v }; return w; }
# define WIDEVAL_GET(w) ((w).value)
#else
typedef WIDEVALUE wideval_t;
# define WIDEVAL_WRAP(v) (v)
# define WIDEVAL_GET(w) (w)
#endif
#if WIDEVALUE_IS_WIDER
static inline wideval_t
wint2wv(wideint_t wi)
{
if (FIXWVABLE(wi))
return WINT2FIXWV(wi);
else
return WIDEVAL_WRAP(INT64toNUM(wi));
}
# define WINT2WV(wi) wint2wv(wi)
#else
# define WINT2WV(wi) WIDEVAL_WRAP(LONG2NUM(wi))
#endif
static inline VALUE
w2v(wideval_t w)
{
#if WIDEVALUE_IS_WIDER
if (FIXWV_P(w))
return INT64toNUM(FIXWV2WINT(w));
return (VALUE)WIDEVAL_GET(w);
#else
return WIDEVAL_GET(w);
#endif
}
#if WIDEVALUE_IS_WIDER
static wideval_t
v2w_bignum(VALUE v)
{
int sign;
uwideint_t u;
sign = rb_integer_pack(v, &u, 1, sizeof(u), 0,
INTEGER_PACK_NATIVE_BYTE_ORDER);
if (sign == 0)
return WINT2FIXWV(0);
else if (sign == -1) {
if (u <= -FIXWV_MIN)
return WINT2FIXWV(-(wideint_t)u);
}
else if (sign == +1) {
if (u <= FIXWV_MAX)
return WINT2FIXWV((wideint_t)u);
}
return WIDEVAL_WRAP(v);
}
#endif
static inline wideval_t
v2w(VALUE v)
{
if (RB_TYPE_P(v, T_RATIONAL)) {
if (RRATIONAL(v)->den != LONG2FIX(1))
return v;
v = RRATIONAL(v)->num;
}
#if WIDEVALUE_IS_WIDER
if (FIXNUM_P(v)) {
return WIDEVAL_WRAP((WIDEVALUE)(SIGNED_WIDEVALUE)(long)v);
}
else if (RB_TYPE_P(v, T_BIGNUM) &&
rb_absint_size(v, NULL) <= sizeof(WIDEVALUE)) {
return v2w_bignum(v);
}
#endif
return WIDEVAL_WRAP(v);
}
static int
weq(wideval_t wx, wideval_t wy)
{
#if WIDEVALUE_IS_WIDER
if (FIXWV_P(wx) && FIXWV_P(wy)) {
return WIDEVAL_GET(wx) == WIDEVAL_GET(wy);
}
return RTEST(rb_funcall(w2v(wx), idEq, 1, w2v(wy)));
#else
return eq(WIDEVAL_GET(wx), WIDEVAL_GET(wy));
#endif
}
static int
wcmp(wideval_t wx, wideval_t wy)
{
VALUE x, y;
#if WIDEVALUE_IS_WIDER
if (FIXWV_P(wx) && FIXWV_P(wy)) {
wideint_t a, b;
a = FIXWV2WINT(wx);
b = FIXWV2WINT(wy);
if (a < b)
return -1;
if (a > b)
return 1;
return 0;
}
#endif
x = w2v(wx);
y = w2v(wy);
return cmp(x, y);
}
#define wne(x,y) (!weq((x),(y)))
#define wlt(x,y) (wcmp((x),(y)) < 0)
#define wgt(x,y) (wcmp((x),(y)) > 0)
#define wle(x,y) (wcmp((x),(y)) <= 0)
#define wge(x,y) (wcmp((x),(y)) >= 0)
static wideval_t
wadd(wideval_t wx, wideval_t wy)
{
#if WIDEVALUE_IS_WIDER
if (FIXWV_P(wx) && FIXWV_P(wy)) {
wideint_t r = FIXWV2WINT(wx) + FIXWV2WINT(wy);
return WINT2WV(r);
}
#endif
return v2w(addv(w2v(wx), w2v(wy)));
}
static wideval_t
wsub(wideval_t wx, wideval_t wy)
{
#if WIDEVALUE_IS_WIDER
if (FIXWV_P(wx) && FIXWV_P(wy)) {
wideint_t r = FIXWV2WINT(wx) - FIXWV2WINT(wy);
return WINT2WV(r);
}
#endif
return v2w(subv(w2v(wx), w2v(wy)));
}
static wideval_t
wmul(wideval_t wx, wideval_t wy)
{
#if WIDEVALUE_IS_WIDER
if (FIXWV_P(wx) && FIXWV_P(wy)) {
if (!MUL_OVERFLOW_FIXWV_P(FIXWV2WINT(wx), FIXWV2WINT(wy)))
return WINT2WV(FIXWV2WINT(wx) * FIXWV2WINT(wy));
}
#endif
return v2w(mulv(w2v(wx), w2v(wy)));
}
static wideval_t
wquo(wideval_t wx, wideval_t wy)
{
#if WIDEVALUE_IS_WIDER
if (FIXWV_P(wx) && FIXWV_P(wy)) {
wideint_t a, b, c;
a = FIXWV2WINT(wx);
b = FIXWV2WINT(wy);
if (b == 0) rb_num_zerodiv();
c = a / b;
if (c * b == a) {
return WINT2WV(c);
}
}
#endif
return v2w(quov(w2v(wx), w2v(wy)));
}
#define wmulquo(x,y,z) ((WIDEVAL_GET(y) == WIDEVAL_GET(z)) ? (x) : wquo(wmul((x),(y)),(z)))
#define wmulquoll(x,y,z) (((y) == (z)) ? (x) : wquo(wmul((x),WINT2WV(y)),WINT2WV(z)))
#if WIDEVALUE_IS_WIDER
static int
wdivmod0(wideval_t wn, wideval_t wd, wideval_t *wq, wideval_t *wr)
{
if (FIXWV_P(wn) && FIXWV_P(wd)) {
wideint_t n, d, q, r;
d = FIXWV2WINT(wd);
if (d == 0) rb_num_zerodiv();
if (d == 1) {
*wq = wn;
*wr = WINT2FIXWV(0);
return 1;
}
if (d == -1) {
wideint_t xneg = -FIXWV2WINT(wn);
*wq = WINT2WV(xneg);
*wr = WINT2FIXWV(0);
return 1;
}
n = FIXWV2WINT(wn);
if (n == 0) {
*wq = WINT2FIXWV(0);
*wr = WINT2FIXWV(0);
return 1;
}
q = n / d;
r = n % d;
if (d > 0 ? r < 0 : r > 0) {
q -= 1;
r += d;
}
*wq = WINT2FIXWV(q);
*wr = WINT2FIXWV(r);
return 1;
}
return 0;
}
#endif
static void
wdivmod(wideval_t wn, wideval_t wd, wideval_t *wq, wideval_t *wr)
{
VALUE vq, vr;
#if WIDEVALUE_IS_WIDER
if (wdivmod0(wn, wd, wq, wr)) return;
#endif
divmodv(w2v(wn), w2v(wd), &vq, &vr);
*wq = v2w(vq);
*wr = v2w(vr);
}
static void
wmuldivmod(wideval_t wx, wideval_t wy, wideval_t wz, wideval_t *wq, wideval_t *wr)
{
if (WIDEVAL_GET(wy) == WIDEVAL_GET(wz)) {
*wq = wx;
*wr = WINT2FIXWV(0);
return;
}
wdivmod(wmul(wx,wy), wz, wq, wr);
}
static wideval_t
wdiv(wideval_t wx, wideval_t wy)
{
#if WIDEVALUE_IS_WIDER
wideval_t q, dmy;
if (wdivmod0(wx, wy, &q, &dmy)) return q;
#endif
return v2w(divv(w2v(wx), w2v(wy)));
}
static wideval_t
wmod(wideval_t wx, wideval_t wy)
{
#if WIDEVALUE_IS_WIDER
wideval_t r, dmy;
if (wdivmod0(wx, wy, &dmy, &r)) return r;
#endif
return v2w(modv(w2v(wx), w2v(wy)));
}
static VALUE
num_exact(VALUE v)
{
VALUE tmp;
if (NIL_P(v)) {
rb_raise(rb_eTypeError, "can't convert nil into an exact number");
}
else if (RB_INTEGER_TYPE_P(v)) {
return v;
}
else if (RB_TYPE_P(v, T_RATIONAL)) {
goto rational;
}
else if (RB_TYPE_P(v, T_STRING)) {
goto typeerror;
}
else {
if ((tmp = rb_check_funcall(v, rb_intern("to_r"), 0, NULL)) != Qundef) {
/* test to_int method availability to reject non-Numeric
* objects such as String, Time, etc which have to_r method. */
if (!rb_respond_to(v, rb_intern("to_int"))) goto typeerror;
}
else if (!NIL_P(tmp = rb_check_to_int(v))) {
return tmp;
}
else {
goto typeerror;
}
}
if (RB_INTEGER_TYPE_P(tmp)) {
v = tmp;
}
else if (RB_TYPE_P(tmp, T_RATIONAL)) {
v = tmp;
rational:
if (RRATIONAL(v)->den == INT2FIX(1))
v = RRATIONAL(v)->num;
}
else {
typeerror:
rb_raise(rb_eTypeError, "can't convert %"PRIsVALUE" into an exact number",
rb_obj_class(v));
}
return v;
}
/* time_t */
static wideval_t
rb_time_magnify(wideval_t w)
{
return wmul(w, WINT2FIXWV(TIME_SCALE));
}
static wideval_t
rb_time_unmagnify(wideval_t w)
{
return wquo(w, WINT2FIXWV(TIME_SCALE));
}
static VALUE
rb_time_unmagnify_to_float(wideval_t w)
{
VALUE v;
#if WIDEVALUE_IS_WIDER
if (FIXWV_P(w)) {
wideint_t a, b, c;
a = FIXWV2WINT(w);
b = TIME_SCALE;
c = a / b;
if (c * b == a) {
return DBL2NUM((double)c);
}
v = DBL2NUM((double)FIXWV2WINT(w));
return quov(v, DBL2NUM(TIME_SCALE));
}
#endif
v = w2v(w);
if (RB_TYPE_P(v, T_RATIONAL))
return rb_Float(quov(v, INT2FIX(TIME_SCALE)));
else
return quov(v, DBL2NUM(TIME_SCALE));
}
static void
split_second(wideval_t timew, wideval_t *timew_p, VALUE *subsecx_p)
{
wideval_t q, r;
wdivmod(timew, WINT2FIXWV(TIME_SCALE), &q, &r);
*timew_p = q;
*subsecx_p = w2v(r);
}
static wideval_t
timet2wv(time_t t)
{
#if WIDEVALUE_IS_WIDER
if (TIMET_MIN == 0) {
uwideint_t wi = (uwideint_t)t;
if (wi <= FIXWV_MAX) {
return WINT2FIXWV(wi);
}
}
else {
wideint_t wi = (wideint_t)t;
if (FIXWV_MIN <= wi && wi <= FIXWV_MAX) {
return WINT2FIXWV(wi);
}
}
#endif
return v2w(TIMET2NUM(t));
}
#define TIMET2WV(t) timet2wv(t)
static time_t
wv2timet(wideval_t w)
{
#if WIDEVALUE_IS_WIDER
if (FIXWV_P(w)) {
wideint_t wi = FIXWV2WINT(w);
if (TIMET_MIN == 0) {
if (wi < 0)
rb_raise(rb_eRangeError, "negative value to convert into `time_t'");
if (TIMET_MAX < (uwideint_t)wi)
rb_raise(rb_eRangeError, "too big to convert into `time_t'");
}
else {
if (wi < TIMET_MIN || TIMET_MAX < wi)
rb_raise(rb_eRangeError, "too big to convert into `time_t'");
}
return (time_t)wi;
}
#endif
return NUM2TIMET(w2v(w));
}
#define WV2TIMET(t) wv2timet(t)
VALUE rb_cTime;
static int obj2int(VALUE obj);
static uint32_t obj2ubits(VALUE obj, size_t bits);
static VALUE obj2vint(VALUE obj);
static uint32_t month_arg(VALUE arg);
static VALUE validate_utc_offset(VALUE utc_offset);
static VALUE validate_zone_name(VALUE zone_name);
static void validate_vtm(struct vtm *vtm);
static uint32_t obj2subsecx(VALUE obj, VALUE *subsecx);
static VALUE time_gmtime(VALUE);
static VALUE time_localtime(VALUE);
static VALUE time_fixoff(VALUE);
static time_t timegm_noleapsecond(struct tm *tm);
static int tmcmp(struct tm *a, struct tm *b);
static int vtmcmp(struct vtm *a, struct vtm *b);
static const char *find_time_t(struct tm *tptr, int utc_p, time_t *tp);
static struct vtm *localtimew(wideval_t timew, struct vtm *result);
static int leap_year_p(long y);
#define leap_year_v_p(y) leap_year_p(NUM2LONG(modv((y), INT2FIX(400))))
int ruby_tz_update;
static struct tm *
rb_localtime_r(const time_t *t, struct tm *result)
{
#if defined __APPLE__ && defined __LP64__
if (*t != (time_t)(int)*t) return NULL;
#endif
if (!ruby_tz_update) {
ruby_tz_update = 1;
tzset();
}
#ifdef HAVE_GMTIME_R
result = localtime_r(t, result);
#else
{
struct tm *tmp = localtime(t);
if (tmp) *result = *tmp;
}
#endif
#if defined(HAVE_MKTIME) && defined(LOCALTIME_OVERFLOW_PROBLEM)
if (result) {
long gmtoff1 = 0;
long gmtoff2 = 0;
struct tm tmp = *result;
time_t t2;
t2 = mktime(&tmp);
# if defined(HAVE_STRUCT_TM_TM_GMTOFF)
gmtoff1 = result->tm_gmtoff;
gmtoff2 = tmp.tm_gmtoff;
# endif
if (*t + gmtoff1 != t2 + gmtoff2)
result = NULL;
}
#endif
return result;
}
#define LOCALTIME(tm, result) rb_localtime_r((tm), &(result))
#ifndef HAVE_STRUCT_TM_TM_GMTOFF
static struct tm *
rb_gmtime_r(const time_t *t, struct tm *result)
{
#ifdef HAVE_GMTIME_R
result = gmtime_r(t, result);
#else
struct tm *tmp = gmtime(t);
if (tmp) *result = *tmp;
#endif
#if defined(HAVE_TIMEGM) && defined(LOCALTIME_OVERFLOW_PROBLEM)
if (result && *t != timegm(result)) {
return NULL;
}
#endif
return result;
}
# define GMTIME(tm, result) rb_gmtime_r((tm), &(result))
#endif
static const int common_year_yday_offset[] = {
-1,
-1 + 31,
-1 + 31 + 28,
-1 + 31 + 28 + 31,
-1 + 31 + 28 + 31 + 30,
-1 + 31 + 28 + 31 + 30 + 31,
-1 + 31 + 28 + 31 + 30 + 31 + 30,
-1 + 31 + 28 + 31 + 30 + 31 + 30 + 31,
-1 + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
-1 + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
-1 + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
-1 + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30
/* 1 2 3 4 5 6 7 8 9 10 11 */
};
static const int leap_year_yday_offset[] = {
-1,
-1 + 31,
-1 + 31 + 29,
-1 + 31 + 29 + 31,
-1 + 31 + 29 + 31 + 30,
-1 + 31 + 29 + 31 + 30 + 31,
-1 + 31 + 29 + 31 + 30 + 31 + 30,
-1 + 31 + 29 + 31 + 30 + 31 + 30 + 31,
-1 + 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31,
-1 + 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
-1 + 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
-1 + 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30
/* 1 2 3 4 5 6 7 8 9 10 11 */
};
static const int common_year_days_in_month[] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
static const int leap_year_days_in_month[] = {
31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
static int
calc_tm_yday(long tm_year, int tm_mon, int tm_mday)
{
int tm_year_mod400 = (int)MOD(tm_year, 400);
int tm_yday = tm_mday;
if (leap_year_p(tm_year_mod400 + 1900))
tm_yday += leap_year_yday_offset[tm_mon];
else
tm_yday += common_year_yday_offset[tm_mon];
return tm_yday;
}
static wideval_t
timegmw_noleapsecond(struct vtm *vtm)
{
VALUE year1900;
VALUE q400, r400;
int year_mod400;
int yday;
long days_in400;
VALUE vdays, ret;
wideval_t wret;
year1900 = subv(vtm->year, INT2FIX(1900));
divmodv(year1900, INT2FIX(400), &q400, &r400);
year_mod400 = NUM2INT(r400);
yday = calc_tm_yday(year_mod400, vtm->mon-1, vtm->mday);
/*
* `Seconds Since the Epoch' in SUSv3:
* tm_sec + tm_min*60 + tm_hour*3600 + tm_yday*86400 +
* (tm_year-70)*31536000 + ((tm_year-69)/4)*86400 -
* ((tm_year-1)/100)*86400 + ((tm_year+299)/400)*86400
*/
ret = LONG2NUM(vtm->sec
+ vtm->min*60
+ vtm->hour*3600);
days_in400 = yday
- 70*365
+ DIV(year_mod400 - 69, 4)
- DIV(year_mod400 - 1, 100)
+ (year_mod400 + 299) / 400;
vdays = LONG2NUM(days_in400);
vdays = addv(vdays, mulv(q400, INT2FIX(97)));
vdays = addv(vdays, mulv(year1900, INT2FIX(365)));
wret = wadd(rb_time_magnify(v2w(ret)), wmul(rb_time_magnify(v2w(vdays)), WINT2FIXWV(86400)));
wret = wadd(wret, v2w(vtm->subsecx));
return wret;
}
static st_table *zone_table;
static int
zone_str_update(st_data_t *key, st_data_t *value, st_data_t arg, int existing)
{
const char *s = (const char *)*key;
const char **ret = (const char **)arg;
if (existing) {
*ret = (const char *)*value;
return ST_STOP;
}
*ret = s = strdup(s);
*key = *value = (st_data_t)s;
return ST_CONTINUE;
}
static const char *
zone_str(const char *s)
{
if (!zone_table)
zone_table = st_init_strtable();
st_update(zone_table, (st_data_t)s, zone_str_update, (st_data_t)&s);
return s;
}
static void
gmtimew_noleapsecond(wideval_t timew, struct vtm *vtm)
{
VALUE v;
int i, n, x, y;
const int *yday_offset;
int wday;
VALUE timev;
wideval_t timew2, w, w2;
VALUE subsecx;
vtm->isdst = 0;
split_second(timew, &timew2, &subsecx);
vtm->subsecx = subsecx;
wdivmod(timew2, WINT2FIXWV(86400), &w2, &w);
timev = w2v(w2);
v = w2v(w);
wday = NUM2INT(modv(timev, INT2FIX(7)));
vtm->wday = (wday + 4) % 7;
n = NUM2INT(v);
vtm->sec = n % 60; n = n / 60;
vtm->min = n % 60; n = n / 60;
vtm->hour = n;
/* 97 leap days in the 400 year cycle */
divmodv(timev, INT2FIX(400*365 + 97), &timev, &v);
vtm->year = mulv(timev, INT2FIX(400));
/* n is the days in the 400 year cycle.
* the start of the cycle is 1970-01-01. */
n = NUM2INT(v);
y = 1970;
/* 30 years including 7 leap days (1972, 1976, ... 1996),
* 31 days in January 2000 and
* 29 days in February 2000
* from 1970-01-01 to 2000-02-29 */
if (30*365+7+31+29-1 <= n) {
/* 2000-02-29 or after */
if (n < 31*365+8) {
/* 2000-02-29 to 2000-12-31 */
y += 30;
n -= 30*365+7;
goto found;
}
else {
/* 2001-01-01 or after */
n -= 1;
}
}
x = n / (365*100 + 24);
n = n % (365*100 + 24);
y += x * 100;
if (30*365+7+31+29-1 <= n) {
if (n < 31*365+7) {
y += 30;
n -= 30*365+7;
goto found;
}
else
n += 1;
}
x = n / (365*4 + 1);
n = n % (365*4 + 1);
y += x * 4;
if (365*2+31+29-1 <= n) {
if (n < 365*2+366) {
y += 2;
n -= 365*2;
goto found;
}
else
n -= 1;
}
x = n / 365;
n = n % 365;
y += x;
found:
vtm->yday = n+1;
vtm->year = addv(vtm->year, INT2NUM(y));
if (leap_year_p(y))
yday_offset = leap_year_yday_offset;
else
yday_offset = common_year_yday_offset;
for (i = 0; i < 12; i++) {
if (yday_offset[i] < n) {
vtm->mon = i+1;
vtm->mday = n - yday_offset[i];
}
else
break;
}
vtm->utc_offset = INT2FIX(0);
vtm->zone = "UTC";
}
static struct tm *
gmtime_with_leapsecond(const time_t *timep, struct tm *result)
{
#if defined(HAVE_STRUCT_TM_TM_GMTOFF)
/* 4.4BSD counts leap seconds only with localtime, not with gmtime. */
struct tm *t;
int sign;
int gmtoff_sec, gmtoff_min, gmtoff_hour, gmtoff_day;
long gmtoff;
t = LOCALTIME(timep, *result);
if (t == NULL)
return NULL;
/* subtract gmtoff */
if (t->tm_gmtoff < 0) {
sign = 1;
gmtoff = -t->tm_gmtoff;
}
else {
sign = -1;
gmtoff = t->tm_gmtoff;
}
gmtoff_sec = (int)(gmtoff % 60);
gmtoff = gmtoff / 60;
gmtoff_min = (int)(gmtoff % 60);
gmtoff = gmtoff / 60;
gmtoff_hour = (int)gmtoff; /* <= 12 */
gmtoff_sec *= sign;
gmtoff_min *= sign;
gmtoff_hour *= sign;
gmtoff_day = 0;
if (gmtoff_sec) {
/* If gmtoff_sec == 0, don't change result->tm_sec.
* It may be 60 which is a leap second. */
result->tm_sec += gmtoff_sec;
if (result->tm_sec < 0) {
result->tm_sec += 60;
gmtoff_min -= 1;
}
if (60 <= result->tm_sec) {
result->tm_sec -= 60;
gmtoff_min += 1;
}
}
if (gmtoff_min) {
result->tm_min += gmtoff_min;
if (result->tm_min < 0) {
result->tm_min += 60;
gmtoff_hour -= 1;
}
if (60 <= result->tm_min) {
result->tm_min -= 60;
gmtoff_hour += 1;
}
}
if (gmtoff_hour) {
result->tm_hour += gmtoff_hour;
if (result->tm_hour < 0) {
result->tm_hour += 24;
gmtoff_day = -1;
}
if (24 <= result->tm_hour) {