Annotation of embedaddon/php/ext/date/lib/unixtime2tm.c, revision 1.1
1.1 ! misho 1: /*
! 2: +----------------------------------------------------------------------+
! 3: | PHP Version 5 |
! 4: +----------------------------------------------------------------------+
! 5: | Copyright (c) 1997-2010 The PHP Group |
! 6: +----------------------------------------------------------------------+
! 7: | This source file is subject to version 3.01 of the PHP license, |
! 8: | that is bundled with this package in the file LICENSE, and is |
! 9: | available through the world-wide-web at the following url: |
! 10: | http://www.php.net/license/3_01.txt |
! 11: | If you did not receive a copy of the PHP license and are unable to |
! 12: | obtain it through the world-wide-web, please send a note to |
! 13: | license@php.net so we can mail you a copy immediately. |
! 14: +----------------------------------------------------------------------+
! 15: | Authors: Derick Rethans <derick@derickrethans.nl> |
! 16: +----------------------------------------------------------------------+
! 17: */
! 18:
! 19: /* $Id: unixtime2tm.c 319767 2011-11-24 17:13:47Z derick $ */
! 20:
! 21: #include "timelib.h"
! 22:
! 23: #include <stdio.h>
! 24:
! 25: #ifdef HAVE_STDLIB_H
! 26: #include <stdlib.h>
! 27: #endif
! 28:
! 29: #ifdef HAVE_STRING_H
! 30: #include <string.h>
! 31: #else
! 32: #include <strings.h>
! 33: #endif
! 34:
! 35: static int month_tab_leap[12] = { -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
! 36: static int month_tab[12] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
! 37:
! 38:
! 39: /* Converts a Unix timestamp value into broken down time, in GMT */
! 40: void timelib_unixtime2gmt(timelib_time* tm, timelib_sll ts)
! 41: {
! 42: timelib_sll days, remainder, tmp_days;
! 43: timelib_sll cur_year = 1970;
! 44: timelib_sll i;
! 45: timelib_sll hours, minutes, seconds;
! 46: int *months;
! 47:
! 48: days = ts / SECS_PER_DAY;
! 49: remainder = ts - (days * SECS_PER_DAY);
! 50: if (ts < 0 && remainder == 0) {
! 51: days++;
! 52: remainder -= SECS_PER_DAY;
! 53: }
! 54: TIMELIB_DEBUG(printf("days=%lld, rem=%lld\n", days, remainder););
! 55:
! 56: if (ts >= 0) {
! 57: tmp_days = days + 1;
! 58:
! 59: if (tmp_days >= DAYS_PER_LYEAR_PERIOD || tmp_days <= -DAYS_PER_LYEAR_PERIOD) {
! 60: cur_year += YEARS_PER_LYEAR_PERIOD * (tmp_days / DAYS_PER_LYEAR_PERIOD);
! 61: tmp_days -= DAYS_PER_LYEAR_PERIOD * (tmp_days / DAYS_PER_LYEAR_PERIOD);
! 62: }
! 63:
! 64: while (tmp_days >= DAYS_PER_LYEAR) {
! 65: cur_year++;
! 66: if (timelib_is_leap(cur_year)) {
! 67: tmp_days -= DAYS_PER_LYEAR;
! 68: } else {
! 69: tmp_days -= DAYS_PER_YEAR;
! 70: }
! 71: }
! 72: } else {
! 73: tmp_days = days;
! 74:
! 75: /* Guess why this might be for, it has to do with a pope ;-). It's also
! 76: * only valid for Great Brittain and it's colonies. It needs fixing for
! 77: * other locales. *sigh*, why is this crap so complex! */
! 78: /*
! 79: if (ts <= TIMELIB_LL_CONST(-6857352000)) {
! 80: tmp_days -= 11;
! 81: }
! 82: */
! 83:
! 84: while (tmp_days <= 0) {
! 85: if (tmp_days < -1460970) {
! 86: cur_year -= 4000;
! 87: TIMELIB_DEBUG(printf("tmp_days=%lld, year=%lld\n", tmp_days, cur_year););
! 88: tmp_days += 1460970;
! 89: } else {
! 90: cur_year--;
! 91: TIMELIB_DEBUG(printf("tmp_days=%lld, year=%lld\n", tmp_days, cur_year););
! 92: if (timelib_is_leap(cur_year)) {
! 93: tmp_days += DAYS_PER_LYEAR;
! 94: } else {
! 95: tmp_days += DAYS_PER_YEAR;
! 96: }
! 97: }
! 98: }
! 99: remainder += SECS_PER_DAY;
! 100: }
! 101: TIMELIB_DEBUG(printf("tmp_days=%lld, year=%lld\n", tmp_days, cur_year););
! 102:
! 103: months = timelib_is_leap(cur_year) ? month_tab_leap : month_tab;
! 104: if (timelib_is_leap(cur_year) && cur_year < 1970) {
! 105: tmp_days--;
! 106: }
! 107: i = 11;
! 108: while (i > 0) {
! 109: TIMELIB_DEBUG(printf("month=%lld (%d)\n", i, months[i]););
! 110: if (tmp_days > months[i]) {
! 111: break;
! 112: }
! 113: i--;
! 114: }
! 115: TIMELIB_DEBUG(printf("A: ts=%lld, year=%lld, month=%lld, day=%lld,", ts, cur_year, i + 1, tmp_days - months[i]););
! 116:
! 117: /* That was the date, now we do the tiiiime */
! 118: hours = remainder / 3600;
! 119: minutes = (remainder - hours * 3600) / 60;
! 120: seconds = remainder % 60;
! 121: TIMELIB_DEBUG(printf(" hour=%lld, minute=%lld, second=%lld\n", hours, minutes, seconds););
! 122:
! 123: tm->y = cur_year;
! 124: tm->m = i + 1;
! 125: tm->d = tmp_days - months[i];
! 126: tm->h = hours;
! 127: tm->i = minutes;
! 128: tm->s = seconds;
! 129: tm->z = 0;
! 130: tm->dst = 0;
! 131: tm->sse = ts;
! 132: tm->sse_uptodate = 1;
! 133: tm->tim_uptodate = 1;
! 134: tm->is_localtime = 0;
! 135: }
! 136:
! 137: void timelib_update_from_sse(timelib_time *tm)
! 138: {
! 139: timelib_sll sse;
! 140:
! 141: sse = tm->sse;
! 142:
! 143: switch (tm->zone_type) {
! 144: case TIMELIB_ZONETYPE_ABBR:
! 145: case TIMELIB_ZONETYPE_OFFSET: {
! 146: int z = tm->z;
! 147: signed int dst = tm->dst;
! 148:
! 149: timelib_unixtime2gmt(tm, tm->sse - (tm->z * 60) + (tm->dst * 3600));
! 150:
! 151: tm->z = z;
! 152: tm->dst = dst;
! 153: goto cleanup;
! 154: }
! 155:
! 156: case TIMELIB_ZONETYPE_ID: {
! 157: timelib_time_offset *gmt_offset;
! 158:
! 159: gmt_offset = timelib_get_time_zone_info(tm->sse, tm->tz_info);
! 160: timelib_unixtime2gmt(tm, tm->sse + gmt_offset->offset);
! 161: timelib_time_offset_dtor(gmt_offset);
! 162:
! 163: goto cleanup;
! 164: }
! 165:
! 166: default:
! 167: timelib_unixtime2gmt(tm, tm->sse);
! 168: goto cleanup;
! 169: }
! 170: cleanup:
! 171: tm->sse = sse;
! 172: tm->is_localtime = 1;
! 173: tm->have_zone = 1;
! 174: }
! 175:
! 176: void timelib_unixtime2local(timelib_time *tm, timelib_sll ts)
! 177: {
! 178: timelib_time_offset *gmt_offset;
! 179: timelib_tzinfo *tz = tm->tz_info;
! 180:
! 181: switch (tm->zone_type) {
! 182: case TIMELIB_ZONETYPE_ABBR:
! 183: case TIMELIB_ZONETYPE_OFFSET: {
! 184: int z = tm->z;
! 185: signed int dst = tm->dst;
! 186:
! 187: timelib_unixtime2gmt(tm, ts - (tm->z * 60) + (tm->dst * 3600));
! 188:
! 189: tm->z = z;
! 190: tm->dst = dst;
! 191: break;
! 192: }
! 193:
! 194: case TIMELIB_ZONETYPE_ID:
! 195: gmt_offset = timelib_get_time_zone_info(ts, tz);
! 196: timelib_unixtime2gmt(tm, ts + gmt_offset->offset);
! 197:
! 198: /* we need to reset the sse here as unixtime2gmt modifies it */
! 199: tm->sse = ts;
! 200: tm->dst = gmt_offset->is_dst;
! 201: tm->z = gmt_offset->offset;
! 202: tm->tz_info = tz;
! 203:
! 204: timelib_time_tz_abbr_update(tm, gmt_offset->abbr);
! 205: timelib_time_offset_dtor(gmt_offset);
! 206: break;
! 207:
! 208: default:
! 209: tm->is_localtime = 0;
! 210: tm->have_zone = 0;
! 211: return;
! 212: }
! 213:
! 214: tm->is_localtime = 1;
! 215: tm->have_zone = 1;
! 216: }
! 217:
! 218: void timelib_set_timezone(timelib_time *t, timelib_tzinfo *tz)
! 219: {
! 220: timelib_time_offset *gmt_offset;
! 221:
! 222: gmt_offset = timelib_get_time_zone_info(t->sse, tz);
! 223: t->z = gmt_offset->offset;
! 224: /*
! 225: if (t->dst != gmt_offset->is_dst) {
! 226: printf("ERROR (%d, %d)\n", t->dst, gmt_offset->is_dst);
! 227: exit(1);
! 228: }
! 229: */
! 230: t->dst = gmt_offset->is_dst;
! 231: t->tz_info = tz;
! 232: if (t->tz_abbr) {
! 233: free(t->tz_abbr);
! 234: }
! 235: t->tz_abbr = strdup(gmt_offset->abbr);
! 236: timelib_time_offset_dtor(gmt_offset);
! 237:
! 238: t->have_zone = 1;
! 239: t->zone_type = TIMELIB_ZONETYPE_ID;
! 240: }
! 241:
! 242: /* Converts the time stored in the struct to localtime if localtime = true,
! 243: * otherwise it converts it to gmttime. This is only done when necessary
! 244: * ofcourse. */
! 245: int timelib_apply_localtime(timelib_time *t, unsigned int localtime)
! 246: {
! 247: if (localtime) {
! 248: /* Converting from GMT time to local time */
! 249: TIMELIB_DEBUG(printf("Converting from GMT time to local time\n"););
! 250:
! 251: /* Check if TZ is set */
! 252: if (!t->tz_info) {
! 253: TIMELIB_DEBUG(printf("E: No timezone configured, can't switch to local time\n"););
! 254: return -1;
! 255: }
! 256:
! 257: timelib_unixtime2local(t, t->sse);
! 258: } else {
! 259: /* Converting from local time to GMT time */
! 260: TIMELIB_DEBUG(printf("Converting from local time to GMT time\n"););
! 261:
! 262: timelib_unixtime2gmt(t, t->sse);
! 263: }
! 264: return 0;
! 265: }
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