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pjdate.c
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pjdate.c
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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
/*
* pjdate.c
* Copyright (C) 2017 M.J.Ahmadi <mohammad.j.ahmadi@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _PJDATE_C
#define _PJDATE_C
#include <stdio.h>
#include "pjdate.h"
#include "helper.h"
char *persian_weekday_name (int weekday)
{
char *buf;
switch (weekday) {
case 1:
buf = "شنبه";
break;
case 2:
buf = "یکشنبه";
break;
case 3:
buf = "دوشنبه";
break;
case 4:
buf = "سه شنبه";
break;
case 5:
buf = "چهار شنبه";
break;
case 6:
buf = "پنجشنبه";
break;
case 7:
buf = "جمعه";
break;
}
return buf;
}
char *persian_weekday_abbreviation_name (int weekday)
{
char *buf;
switch (weekday) {
case 1:
buf = "ش";
break;
case 2:
buf = "ی";
break;
case 3:
buf = "د";
break;
case 4:
buf = "س";
break;
case 5:
buf = "چ";
break;
case 6:
buf = "پ";
break;
case 7:
buf = "ج";
break;
}
return buf + '\0';
}
char *persian_month_name (int month)
{
char *buf;
switch (month) {
case 1:
buf = "فروردین";
break;
case 2:
buf = "اردیبهشت";
break;
case 3:
buf = "خرداد";
break;
case 4:
buf = "مرداد";
break;
case 5:
buf = "تیر";
break;
case 6:
buf = "شهریور";
break;
case 7:
buf = "مهر";
break;
case 8:
buf = "آبان";
break;
case 9:
buf = "آذر";
break;
case 10:
buf = "دی";
break;
case 11:
buf = "بهمن";
break;
case 12:
buf = "اسفند";
break;
}
return buf;
}
pjdate jalali_to_gregorian(int j_y, int j_m, int j_d)
{
int i;
int jy = j_y - 979;
int jm = j_m - 1;
int jd = j_d - 1;
int j_day_no = 365 * jy + _div(jy, 33) * 8 + _div(jy % 33 + 3, 4);
for (i = 0; i < jm; ++i) {
j_day_no += j_days_in_month[i];
}
j_day_no += jd;
int g_day_no = j_day_no + 79;
int gy = 1600 + 400 * _div(g_day_no, 146097);
g_day_no = g_day_no % 146097;
int leap = true;
if (g_day_no >= 36525) {
g_day_no--;
gy += 100 * _div(g_day_no, 36524);
g_day_no = g_day_no % 36524;
if (g_day_no >= 365) {
g_day_no++;
} else {
leap = false;
}
}
gy += 4 * _div(g_day_no, 1461);
g_day_no %= 1461;
if (g_day_no >= 366) {
leap = false;
g_day_no--;
gy += _div(g_day_no, 365);
g_day_no = g_day_no % 365;
}
for (i = 0; g_day_no >= g_days_in_month[i] + (i == 1 && leap); i++) {
g_day_no -= g_days_in_month[i] + (i == 1 && leap);
}
int gm = i + 1;
int gd = g_day_no + 1;
pjdate pjdate;
pjdate.year = _inttostr(gy);
pjdate.month = _inttostr(gm);
pjdate.day = _inttostr(gd);
return pjdate;
}
pjdate gregorian_to_jalali (int g_y, int g_m, int g_d)
{
int i;
int gy = g_y - 1600;
int gm = g_m - 1;
int gd = g_d - 1;
int g_day_no = 365 * gy + _div(gy + 3, 4) - _div(gy + 99, 100) + _div(gy + 399, 400);
for (i=0; i < gm; ++i) {
g_day_no += g_days_in_month[i];
}
if (gm > 1 && ((gy % 4 == 0 && gy % 100 != 0) || (gy % 400 == 0))) {
g_day_no++;
}
g_day_no += gd;
int j_day_no = g_day_no - 79;
int j_np = _div(j_day_no, 12053);
j_day_no = j_day_no % 12053;
int jy = 979 + 33 * j_np + 4 * _div(j_day_no, 1461);
j_day_no %= 1461;
if (j_day_no >= 366) {
jy += _div(j_day_no - 1, 365);
j_day_no = (j_day_no-1) % 365;
}
for (i = 0; i < 11 && j_day_no >= j_days_in_month[i]; ++i) {
j_day_no -= j_days_in_month[i];
}
int jm = i+1;
int jd = j_day_no + 1;
pjdate pjdate;
pjdate.year = _inttostr(jy);
pjdate.month = _inttostr(jm);
pjdate.day = _inttostr(jd);
return pjdate;
}
#endif /* _PJDATE_C */