]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Paul Eggert (eggert@twinsun.com). | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | /* | |
21 | * dgb 10/02/98: ripped this from glibc source to help convert timestamps to unix time | |
22 | * 10/04/98: added new table-based lookup after seeing how ugly the gnu code is | |
23 | * blf 09/27/99: ripped out all the old code and inserted new table from | |
24 | * John Brockmeyer (without leap second corrections) | |
25 | * rewrote udf_stamp_to_time and fixed timezone accounting in | |
26 | udf_time_to_stamp. | |
27 | */ | |
28 | ||
29 | /* | |
30 | * We don't take into account leap seconds. This may be correct or incorrect. | |
31 | * For more NIST information (especially dealing with leap seconds), see: | |
32 | * http://www.boulder.nist.gov/timefreq/pubs/bulletin/leapsecond.htm | |
33 | */ | |
34 | ||
35 | #include <linux/types.h> | |
36 | #include <linux/kernel.h> | |
37 | #include "udfdecl.h" | |
38 | ||
39 | #define EPOCH_YEAR 1970 | |
40 | ||
41 | #ifndef __isleap | |
42 | /* Nonzero if YEAR is a leap year (every 4 years, | |
43 | except every 100th isn't, and every 400th is). */ | |
44 | #define __isleap(year) \ | |
45 | ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) | |
46 | #endif | |
47 | ||
48 | /* How many days come before each month (0-12). */ | |
e74d633d | 49 | static const unsigned short int __mon_yday[2][13] = |
1da177e4 LT |
50 | { |
51 | /* Normal years. */ | |
52 | { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, | |
53 | /* Leap years. */ | |
54 | { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } | |
55 | }; | |
56 | ||
57 | #define MAX_YEAR_SECONDS 69 | |
58 | #define SPD 0x15180 /*3600*24*/ | |
59 | #define SPY(y,l,s) (SPD * (365*y+l)+s) | |
60 | ||
61 | static time_t year_seconds[MAX_YEAR_SECONDS]= { | |
62 | /*1970*/ SPY( 0, 0,0), SPY( 1, 0,0), SPY( 2, 0,0), SPY( 3, 1,0), | |
63 | /*1974*/ SPY( 4, 1,0), SPY( 5, 1,0), SPY( 6, 1,0), SPY( 7, 2,0), | |
64 | /*1978*/ SPY( 8, 2,0), SPY( 9, 2,0), SPY(10, 2,0), SPY(11, 3,0), | |
65 | /*1982*/ SPY(12, 3,0), SPY(13, 3,0), SPY(14, 3,0), SPY(15, 4,0), | |
66 | /*1986*/ SPY(16, 4,0), SPY(17, 4,0), SPY(18, 4,0), SPY(19, 5,0), | |
67 | /*1990*/ SPY(20, 5,0), SPY(21, 5,0), SPY(22, 5,0), SPY(23, 6,0), | |
68 | /*1994*/ SPY(24, 6,0), SPY(25, 6,0), SPY(26, 6,0), SPY(27, 7,0), | |
69 | /*1998*/ SPY(28, 7,0), SPY(29, 7,0), SPY(30, 7,0), SPY(31, 8,0), | |
70 | /*2002*/ SPY(32, 8,0), SPY(33, 8,0), SPY(34, 8,0), SPY(35, 9,0), | |
71 | /*2006*/ SPY(36, 9,0), SPY(37, 9,0), SPY(38, 9,0), SPY(39,10,0), | |
72 | /*2010*/ SPY(40,10,0), SPY(41,10,0), SPY(42,10,0), SPY(43,11,0), | |
73 | /*2014*/ SPY(44,11,0), SPY(45,11,0), SPY(46,11,0), SPY(47,12,0), | |
74 | /*2018*/ SPY(48,12,0), SPY(49,12,0), SPY(50,12,0), SPY(51,13,0), | |
75 | /*2022*/ SPY(52,13,0), SPY(53,13,0), SPY(54,13,0), SPY(55,14,0), | |
76 | /*2026*/ SPY(56,14,0), SPY(57,14,0), SPY(58,14,0), SPY(59,15,0), | |
77 | /*2030*/ SPY(60,15,0), SPY(61,15,0), SPY(62,15,0), SPY(63,16,0), | |
78 | /*2034*/ SPY(64,16,0), SPY(65,16,0), SPY(66,16,0), SPY(67,17,0), | |
79 | /*2038*/ SPY(68,17,0) | |
80 | }; | |
81 | ||
82 | extern struct timezone sys_tz; | |
83 | ||
84 | #define SECS_PER_HOUR (60 * 60) | |
85 | #define SECS_PER_DAY (SECS_PER_HOUR * 24) | |
86 | ||
87 | time_t * | |
88 | udf_stamp_to_time(time_t *dest, long *dest_usec, kernel_timestamp src) | |
89 | { | |
90 | int yday; | |
91 | uint8_t type = src.typeAndTimezone >> 12; | |
92 | int16_t offset; | |
93 | ||
94 | if (type == 1) | |
95 | { | |
96 | offset = src.typeAndTimezone << 4; | |
97 | /* sign extent offset */ | |
98 | offset = (offset >> 4); | |
99 | if (offset == -2047) /* unspecified offset */ | |
100 | offset = 0; | |
101 | } | |
102 | else | |
103 | offset = 0; | |
104 | ||
105 | if ((src.year < EPOCH_YEAR) || | |
f59154c5 | 106 | (src.year >= EPOCH_YEAR+MAX_YEAR_SECONDS)) |
1da177e4 LT |
107 | { |
108 | *dest = -1; | |
109 | *dest_usec = -1; | |
110 | return NULL; | |
111 | } | |
112 | *dest = year_seconds[src.year - EPOCH_YEAR]; | |
113 | *dest -= offset * 60; | |
114 | ||
115 | yday = ((__mon_yday[__isleap (src.year)] | |
116 | [src.month-1]) + (src.day-1)); | |
117 | *dest += ( ( (yday* 24) + src.hour ) * 60 + src.minute ) * 60 + src.second; | |
118 | *dest_usec = src.centiseconds * 10000 + src.hundredsOfMicroseconds * 100 + src.microseconds; | |
119 | return dest; | |
120 | } | |
121 | ||
122 | ||
123 | kernel_timestamp * | |
124 | udf_time_to_stamp(kernel_timestamp *dest, struct timespec ts) | |
125 | { | |
126 | long int days, rem, y; | |
127 | const unsigned short int *ip; | |
128 | int16_t offset; | |
129 | ||
130 | offset = -sys_tz.tz_minuteswest; | |
131 | ||
132 | if (!dest) | |
133 | return NULL; | |
134 | ||
135 | dest->typeAndTimezone = 0x1000 | (offset & 0x0FFF); | |
136 | ||
137 | ts.tv_sec += offset * 60; | |
138 | days = ts.tv_sec / SECS_PER_DAY; | |
139 | rem = ts.tv_sec % SECS_PER_DAY; | |
140 | dest->hour = rem / SECS_PER_HOUR; | |
141 | rem %= SECS_PER_HOUR; | |
142 | dest->minute = rem / 60; | |
143 | dest->second = rem % 60; | |
144 | y = 1970; | |
145 | ||
146 | #define DIV(a,b) ((a) / (b) - ((a) % (b) < 0)) | |
147 | #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400)) | |
148 | ||
149 | while (days < 0 || days >= (__isleap(y) ? 366 : 365)) | |
150 | { | |
151 | long int yg = y + days / 365 - (days % 365 < 0); | |
152 | ||
153 | /* Adjust DAYS and Y to match the guessed year. */ | |
154 | days -= ((yg - y) * 365 | |
155 | + LEAPS_THRU_END_OF (yg - 1) | |
156 | - LEAPS_THRU_END_OF (y - 1)); | |
157 | y = yg; | |
158 | } | |
159 | dest->year = y; | |
160 | ip = __mon_yday[__isleap(y)]; | |
161 | for (y = 11; days < (long int) ip[y]; --y) | |
162 | continue; | |
163 | days -= ip[y]; | |
164 | dest->month = y + 1; | |
165 | dest->day = days + 1; | |
166 | ||
167 | dest->centiseconds = ts.tv_nsec / 10000000; | |
168 | dest->hundredsOfMicroseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000) / 100; | |
169 | dest->microseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000 - | |
170 | dest->hundredsOfMicroseconds * 100); | |
171 | return dest; | |
172 | } | |
173 | ||
174 | /* EOF */ |