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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: }