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/*** ymcw.c -- guts for ymcw dates
*
* Copyright (C) 2010-2018 Sebastian Freundt
*
* Author: Sebastian Freundt <freundt@ga-group.nl>
*
* This file is part of dateutils.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the author nor the names of any contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
**/
#define ASPECT_YMCW
#if !defined DEFUN
# define DEFUN
#endif /* !DEFUN */
#if !defined YMCW_ASPECT_HELPERS_
#define YMCW_ASPECT_HELPERS_
static __attribute__((pure)) unsigned int
__get_mcnt(unsigned int y, unsigned int m, dt_dow_t w)
{
/* get the number of weekdays W in Y-M, which is the max count
* for a weekday W in ymcw dates in year Y and month M */
dt_dow_t wd01 = __get_m01_wday(y, m);
unsigned int md = __get_mdays(y, m);
/* the maximum number of WD01s in Y-M */
unsigned int wd01cnt = (md - 1) / GREG_DAYS_P_WEEK + 1;
/* modulus */
unsigned int wd01mod = (md - 1) % GREG_DAYS_P_WEEK;
/* now the next WD01MOD days also have WD01CNT occurrences
* if wd01 + wd01mod exceeds the DAYS_PER_WEEK barrier wrap
* around by extending W to W + DAYS_PER_WEEK */
if ((w >= wd01 && w <= wd01 + wd01mod) ||
(w + GREG_DAYS_P_WEEK) <= wd01 + wd01mod) {
return wd01cnt;
} else {
return wd01cnt - 1;
}
}
DEFUN dt_ymcw_t
__ymcw_fixup(dt_ymcw_t d)
{
/* given dates like 2012-02-05-01 this returns 2012-02-04-01 */
int mc;
if (LIKELY(d.c <= 4)) {
/* every month has 4 occurrences of any weekday */
;
} else if (d.m == 0 || d.w == DT_MIRACLEDAY) {
/* um */
;
} else if (d.c > (mc = __get_mcnt(d.y, d.m, (dt_dow_t)d.w))) {
d.c = mc;
}
return d;
}
#endif /* YMCW_ASPECT_HELPERS_ */
#if defined ASPECT_GETTERS && !defined YMCW_ASPECT_GETTERS_
#define YMCW_ASPECT_GETTERS_
static dt_dow_t
__ymcw_get_wday(dt_ymcw_t that)
{
return (dt_dow_t)(that.w ?: DT_SUNDAY);
}
DEFUN unsigned int
__ymcw_get_yday(dt_ymcw_t that)
{
/* return the N-th W-day in Y, this is equivalent with 8601's Y-W-D calendar
* where W is the week of the year and D the day in the week */
/* if a year starts on W, then it's
* 5 Ws in jan
* 4 Ws in feb
* 4 Ws in mar
* 5 Ws in apr
* 4 Ws in may
* 4 Ws in jun
* 5 Ws in jul
* 4 Ws in aug
* 4 + leap Ws in sep
* 5 - leap Ws in oct
* 4 Ws in nov
* 5 Ws in dec,
* so go back to the last W, and compute its number instead
*
* Here's the full schema:
* For W+0
* 5 4 4 5 4 4 5 4 4 5 4 5 non-leap
* 5 4 4 5 4 4 5 4 5 4 4 5 leap flip9
*
* For W+1
* 5 4 4 4 5 4 5 4 4 5 4 4 non-leap
* 5 4 4 5 4 4 5 4 4 5 4 5 leap flip4 flip12
*
* For W+2
* 5 4 4 4 5 4 4 5 4 5 4 4 non-leap
* 5 4 4 4 5 4 5 4 4 5 4 4 leap flip7
*
* For W+3
* 4 4 5 4 5 4 4 5 4 4 5 4 non-leap
* 4 5 4 4 5 4 4 5 4 5 4 4 leap flip2 flip10
*
* For W+4
* 4 4 5 4 4 5 4 5 4 4 5 4 non-leap
* 4 4 5 4 5 4 4 5 4 4 5 4 leap flip5
*
* For W+5
* 4 4 5 4 4 5 4 4 5 4 4 5 non-leap
* 4 4 5 4 4 5 4 5 4 4 5 4 leap flip8 flip11
*
* For W+6
* 4 4 4 5 4 4 5 4 5 4 4 5 non-leap
* 4 4 5 4 4 5 4 4 5 4 4 5 leap flip3 flip6
*
* flipN denotes which month in a leap year becomes 5 where the
* month in the non-leap year equivalent has value 4.
*
* The flips for W+1 W+2, W+4, W+5, W+6 can be presented through
* non-leap rules:
*
* 544544544545544544544545
* 544544545445544544545445
*
* 544454544544544454544544
* 544544544545544544544545 = non-leap W+0
*
* 544454454544544454454544
* 544454544544544454544544 = non-leap W+1
*
* 445454454454445454454454
* 454454454544454454454544
*
* 445445454454445445454454
* 445454454454445454454454 = non-leap W+3
*
* 445445445445445445445445
* 445445454454445445454454 = non-leap W+4
*
* 444544545445444544545445
* 445445445445445445445445 = non-leap W+5
*/
static uint8_t ycum[][12] = {
{
/* W+0 */
0, 5, 9, 13, 18, 22, 26, 31, 35, 39, 44, 48, /*53*/
}, {
/* W+1 */
0, 5, 9, 13, 17, 22, 26, 31, 35, 39, 44, 48, /*52*/
}, {
/* W+2 */
0, 5, 9, 13, 17, 22, 26, 30, 35, 39, 44, 48, /*52*/
}, {
/* W+3 */
0, 4, 8, 13, 17, 22, 26, 30, 35, 39, 43, 48, /*52*/
}, {
/* W+4 */
0, 4, 8, 13, 17, 21, 26, 30, 35, 39, 43, 48, /*52*/
}, {
/* W+5 */
0, 4, 8, 13, 17, 21, 26, 30, 34, 39, 43, 47, /*52*/
}, {
/* W+6 */
0, 4, 8, 12, 17, 21, 25, 30, 34, 39, 43, 47, /*52*/
}, {
/* leap-year rule W+0 */
0, 5, 9, 13, 18, 22, 26, 31, 35, 40, 44, 48, /*53*/
/* leap-year rule W+3 = W+0 + 1mo + 4 */
},
};
dt_dow_t j01w = __get_jan01_wday(that.y);
unsigned int diff = j01w <= that.w ? that.w - j01w : that.w + 7 - j01w;
if (UNLIKELY(__leapp(that.y))) {
switch (diff) {
case 3:
if (UNLIKELY(that.m < 2)) {
return that.c;
}
return that.c + (ycum[7])[that.m - 2] + 4;
case 0:
return that.c + (ycum[7])[that.m - 1];
default:
case 1:
case 2:
case 4:
case 5:
case 6:
diff--;
break;
}
}
return that.c + (ycum[diff])[that.m - 1];
}
static unsigned int
__ymcw_get_mday(dt_ymcw_t that)
{
unsigned int wd01;
unsigned int res;
/* see what weekday the first of the month was*/
wd01 = __get_m01_wday(that.y, that.m);
/* first WD1 is 1, second WD1 is 8, third WD1 is 15, etc.
* so the first WDx with WDx > WD1 is on (WDx - WD1) + 1 */
res = (that.w + GREG_DAYS_P_WEEK - wd01) % GREG_DAYS_P_WEEK + 1;
res += GREG_DAYS_P_WEEK * (that.c - 1);
/* not all months have a 5th X, so check for this */
if (res > __get_mdays(that.y, that.m)) {
/* 5th = 4th in that case */
res -= GREG_DAYS_P_WEEK;
}
return res;
}
static int
__ymcw_get_bday(dt_ymcw_t that, dt_bizda_param_t bp)
{
dt_dow_t wd01;
int res;
switch (that.w) {
case DT_SUNDAY:
case DT_SATURDAY:
return -1;
default:
break;
}
if (bp.ab != BIZDA_AFTER || bp.ref != BIZDA_ULTIMO) {
/* no support yet */
return -1;
}
/* weekday the month started with */
wd01 = __get_m01_wday(that.y, that.m);
res = (signed int)(that.w - wd01) + DUWW_BDAYS_P_WEEK * (that.c) + 1;
return res;
}
#endif /* YMCW_ASPECT_GETTERS_ */
#if defined ASPECT_CONV && !defined YMCW_ASPECT_CONV_
#define YMCW_ASPECT_CONV_
/* we need some getter stuff, so get it */
#define ASPECT_GETTERS
#include "ymcw.c"
#undef ASPECT_GETTERS
static dt_ymd_t
__ymcw_to_ymd(dt_ymcw_t d)
{
unsigned int md = __ymcw_get_mday(d);
#if defined HAVE_ANON_STRUCTS_INIT
return (dt_ymd_t){.y = d.y, .m = d.m, .d = md};
#else /* !HAVE_ANON_STRUCTS_INIT */
dt_ymd_t res;
res.y = d.y;
res.m = d.m;
res.d = md;
return res;
#endif /* HAVE_ANON_STRUCTS_INIT */
}
static dt_ywd_t
__ymcw_to_ywd(dt_ymcw_t d)
{
unsigned int y = d.y;
dt_dow_t w = (dt_dow_t)d.w;
unsigned int c = __ymcw_get_yday(d);
return __make_ywd_c(y, c, w, YWD_ABSWK_CNT);
}
static dt_daisy_t
__ymcw_to_daisy(dt_ymcw_t d)
{
dt_daisy_t res;
unsigned int sy = d.y;
unsigned int sm = d.m;
unsigned int sd;
if (UNLIKELY((signed int)TO_BASE(sy) < 0)) {
return 0;
}
sd = __ymcw_get_mday(d);
res = __jan00_daisy(sy);
res += __md_get_yday(sy, sm, sd);
return res;
}
static dt_yd_t
__ymcw_to_yd(dt_ymcw_t d)
{
unsigned int sd = __ymcw_get_mday(d);
unsigned int sm = d.m;
unsigned int sy = d.y;
#if defined HAVE_ANON_STRUCTS_INIT
return (dt_yd_t){.y = sy, .d = __md_get_yday(sy, sm, sd)};
#else
dt_yd_t res;
res.y = sy;
res.d = __md_get_yday(sy, sm, sd);
return res;
#endif
}
#endif /* ASPECT_CONV */
#if defined ASPECT_ADD && !defined YMCW_ASPECT_ADD_
#define YMCW_ASPECT_ADD_
static dt_ymcw_t
__ymcw_fixup_c(unsigned int y, signed int m, signed int c, dt_dow_t w)
{
dt_ymcw_t res = {0};
/* fixup q */
if (LIKELY(c >= 1 && c <= 4)) {
/* all months in our design range have 4 occurrences of
* any weekday, so YAAAY*/
;
} else if (c < 1) {
int mc;
do {
if (UNLIKELY(--m < 1)) {
--y;
m = GREG_MONTHS_P_YEAR;
}
mc = __get_mcnt(y, m, w);
c += mc;
} while (c < 1);
} else {
int mc;
while (c > (mc = __get_mcnt(y, m, w))) {
c -= mc;
if (UNLIKELY(++m > (signed int)GREG_MONTHS_P_YEAR)) {
++y;
m = 1;
}
}
}
/* final assignment */
res.y = y;
res.m = m;
res.c = c;
res.w = w;
return res;
}
static dt_ymcw_t
__ymcw_add_w(dt_ymcw_t d, int n)
{
/* add N weeks to D */
signed int tgtc = d.c + n;
return __ymcw_fixup_c(d.y, d.m, tgtc, (dt_dow_t)d.w);
}
static dt_ymcw_t
__ymcw_add_d(dt_ymcw_t d, int n)
{
/* add N days to D
* we reduce this to __ymcw_add_w() */
signed int aw = n / (signed int)GREG_DAYS_P_WEEK;
signed int ad = n % (signed int)GREG_DAYS_P_WEEK;
if ((ad += d.w) >= (signed int)GREG_DAYS_P_WEEK) {
ad -= GREG_DAYS_P_WEEK;
aw++;
} else if (ad < 0) {
ad += GREG_DAYS_P_WEEK;
aw--;
}
/* fixup for abswk count, m01 may be any wd */
{
dt_dow_t m01 = __get_m01_wday(d.y, d.m);
if ((dt_dow_t)d.w < m01 && (dt_dow_t)ad >= m01) {
aw++;
} else if ((dt_dow_t)d.w >= m01 && (dt_dow_t)ad < m01) {
aw--;
}
}
d.w = (dt_dow_t)ad;
return __ymcw_add_w(d, aw);
}
static dt_ymcw_t
__ymcw_add_b(dt_ymcw_t d, int n)
{
/* add N business days to D */
#if 0
/* trivial trait, reduce to _add_d() problem and dispatch */
dt_dow_t wd = __ymcw_get_wday(d);
return __ymcw_add_d(d, __get_d_equiv(wd, n));
#else
signed int aw = n / (signed int)DUWW_BDAYS_P_WEEK;
signed int ad = n % (signed int)DUWW_BDAYS_P_WEEK;
if ((ad += d.w) > (signed int)DUWW_BDAYS_P_WEEK) {
ad -= DUWW_BDAYS_P_WEEK;
aw++;
} else if (ad <= 0) {
ad += DUWW_BDAYS_P_WEEK;
aw--;
}
/* fixup for abswk count, m01 may be any wd */
{
dt_dow_t m01 = __get_m01_wday(d.y, d.m);
if ((dt_dow_t)d.w < m01 && (dt_dow_t)ad >= m01) {
aw++;
} else if ((dt_dow_t)d.w >= m01 && (dt_dow_t)ad < m01) {
aw--;
}
}
d.w = (dt_dow_t)ad;
return __ymcw_add_w(d, aw);
#endif
}
static dt_ymcw_t
__ymcw_add_m(dt_ymcw_t d, int n)
{
/* add N months to D */
signed int tgtm = d.m + n;
while (tgtm > (signed int)GREG_MONTHS_P_YEAR) {
tgtm -= GREG_MONTHS_P_YEAR;
++d.y;
}
while (tgtm < 1) {
tgtm += GREG_MONTHS_P_YEAR;
--d.y;
}
/* final assignment */
d.m = tgtm;
return d;
}
static dt_ymcw_t
__ymcw_add_y(dt_ymcw_t d, int n)
{
/* add N years to D */
d.y += n;
return d;
}
#endif /* ASPECT_ADD */
#if defined ASPECT_DIFF && !defined YMCW_ASPECT_DIFF_
#define YMCW_ASPECT_DIFF_
static struct dt_ddur_s
__ymcw_diff(dt_ymcw_t d1, dt_ymcw_t d2)
{
/* compute d2 - d1 entirely in terms of ymd */
struct dt_ddur_s res = dt_make_ddur(DT_DURYMCW, 0);
signed int tgtd;
signed int tgtm;
dt_dow_t wd01, wd02;
if (__ymcw_cmp(d1, d2) > 0) {
dt_ymcw_t tmp = d1;
d1 = d2;
d2 = tmp;
res.neg = 1;
}
wd01 = __get_m01_wday(d1.y, d1.m);
if (d2.y != d1.y || d2.m != d1.m) {
wd02 = __get_m01_wday(d2.y, d2.m);
} else {
wd02 = wd01;
}
/* first compute the difference in months Y2-M2-01 - Y1-M1-01 */
tgtm = GREG_MONTHS_P_YEAR * (d2.y - d1.y) + (d2.m - d1.m);
/* using the firsts of the month WD01, represent d1 and d2 as
* the C-th WD01 plus OFF */
{
unsigned int off1;
unsigned int off2;
off1 = __uimod(d1.w - wd01, GREG_DAYS_P_WEEK);
off2 = __uimod(d2.w - wd02, GREG_DAYS_P_WEEK);
tgtd = off2 - off1 + GREG_DAYS_P_WEEK * (d2.c - d1.c);
}
/* fixups */
if (tgtd < (signed int)GREG_DAYS_P_WEEK && tgtm > 0) {
/* if tgtm is 0 it remains 0 and tgtd remains negative */
/* get the target month's mdays */
unsigned int d2m = d2.m;
unsigned int d2y = d2.y;
if (--d2m < 1) {
d2m = GREG_MONTHS_P_YEAR;
d2y--;
}
tgtd += __get_mdays(d2y, d2m);
tgtm--;
}
/* fill in the results */
res.ymcw.y = tgtm / GREG_MONTHS_P_YEAR;
res.ymcw.m = tgtm % GREG_MONTHS_P_YEAR;
res.ymcw.c = tgtd / GREG_DAYS_P_WEEK;
res.ymcw.w = tgtd % GREG_DAYS_P_WEEK;
return res;
}
#endif /* ASPECT_DIFF */
#if defined ASPECT_CMP && !defined YMCW_ASPECT_CMP_
#define YMCW_ASPECT_CMP_
DEFUN int
__ymcw_cmp(dt_ymcw_t d1, dt_ymcw_t d2)
{
if (d1.y < d2.y) {
return -1;
} else if (d1.y > d2.y) {
return 1;
} else if (d1.m < d2.m) {
return -1;
} else if (d1.m > d2.m) {
return 1;
}
/* we're down to counts, however, the last W of a month is always
* count 5, even though counting forward it would be 4 */
if (d1.c < d2.c) {
return -1;
} else if (d1.c > d2.c) {
return 1;
}
/* now it's up to the first of the month */
{
dt_dow_t wd01;
unsigned int off1;
unsigned int off2;
wd01 = __get_m01_wday(d1.y, d1.m);
/* represent cw as C-th WD01 + OFF */
off1 = __uimod(d1.w - wd01, GREG_DAYS_P_WEEK);
off2 = __uimod(d2.w - wd01, GREG_DAYS_P_WEEK);
if (off1 < off2) {
return -1;
} else if (off1 > off2) {
return 1;
} else {
return 0;
}
}
}
#endif /* ASPECT_CMP */
#if defined ASPECT_STRF && !defined YMCW_ASPECT_STRF_
#define YMCW_ASPECT_STRF_
#endif /* ASPECT_STRF */
/* ymcw.c ends here */
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