subr_fattime.c (7ea93e912bf0ef51cec2ce4e86557eef4039ce57) subr_fattime.c (b39be1b35ced251ca5f39addb70d3c28e6fd2d54)
1/*-
2 * Copyright (c) 2006 Poul-Henning Kamp
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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43 * timezone much less if daylight savings time applies.
44 *
45 * Later on again, in Windows NT, timestamps were defined relative to GMT.
46 *
47 * Purists will point out that UTC replaced GMT for such uses around
48 * a century ago, already then. Ironically "NT" was an abbreviation of
49 * "New Technology". Anyway...
50 *
1/*-
2 * Copyright (c) 2006 Poul-Henning Kamp
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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43 * timezone much less if daylight savings time applies.
44 *
45 * Later on again, in Windows NT, timestamps were defined relative to GMT.
46 *
47 * Purists will point out that UTC replaced GMT for such uses around
48 * a century ago, already then. Ironically "NT" was an abbreviation of
49 * "New Technology". Anyway...
50 *
51 * The 'utc' argument determines if the resulting FATTIME timestamp
52 * should b on the UTC or local timezone calendar.
51 * The functions below always assume UTC time, and the calling code
52 * must apply the local timezone offset as appropriate. Unless special
53 * conditions apply, the utc_offset() function be used for this.
53 *
54 * The conversion functions below cut time into four-year leap-second
55 * cycles rather than single years and uses table lookups inside those
56 * cycles to get the months and years sorted out.
57 *
58 * Obviously we cannot calculate the correct table index going from
59 * a posix seconds count to Y/M/D, but we can get pretty close by
60 * dividing the daycount by 32 (giving a too low index), and then

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130 { MAY + 3 * YEAR + 1, ENC(3, 6) }, { JUN + 3 * YEAR + 1, ENC(3, 7) },
131 { JUL + 3 * YEAR + 1, ENC(3, 8) }, { AUG + 3 * YEAR + 1, ENC(3, 9) },
132 { SEP + 3 * YEAR + 1, ENC(3, 10) }, { OCT + 3 * YEAR + 1, ENC(3, 11) },
133 { NOV + 3 * YEAR + 1, ENC(3, 12) }
134};
135
136
137void
54 *
55 * The conversion functions below cut time into four-year leap-second
56 * cycles rather than single years and uses table lookups inside those
57 * cycles to get the months and years sorted out.
58 *
59 * Obviously we cannot calculate the correct table index going from
60 * a posix seconds count to Y/M/D, but we can get pretty close by
61 * dividing the daycount by 32 (giving a too low index), and then

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131 { MAY + 3 * YEAR + 1, ENC(3, 6) }, { JUN + 3 * YEAR + 1, ENC(3, 7) },
132 { JUL + 3 * YEAR + 1, ENC(3, 8) }, { AUG + 3 * YEAR + 1, ENC(3, 9) },
133 { SEP + 3 * YEAR + 1, ENC(3, 10) }, { OCT + 3 * YEAR + 1, ENC(3, 11) },
134 { NOV + 3 * YEAR + 1, ENC(3, 12) }
135};
136
137
138void
138timespec2fattime(struct timespec *tsp, int utc, u_int16_t *ddp, u_int16_t *dtp, u_int8_t *dhp)
139timet2fattime(struct timespec *tsp, u_int16_t *ddp, u_int16_t *dtp, u_int8_t *dhp)
139{
140 time_t t1;
141 unsigned t2, l, m;
142
143 t1 = tsp->tv_sec;
140{
141 time_t t1;
142 unsigned t2, l, m;
143
144 t1 = tsp->tv_sec;
144 if (!utc)
145 t1 -= utc_offset();
146
147 if (dhp != NULL)
148 *dhp = (tsp->tv_sec & 1) * 100 + tsp->tv_nsec / 10000000;
149 if (dtp != NULL) {
150 *dtp = (t1 / 2) % 30;
151 *dtp |= ((t1 / 60) % 60) << 5;
152 *dtp |= ((t1 / 3600) % 24) << 11;
153 }

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210 DCOD(NOV, 2, 1), DCOD(DEC, 2, 1), 0, 0,
211 0, DCOD( 0, 3, 1), DCOD(JAN, 3, 1), DCOD(FEB, 3, 1),
212 DCOD(MAR, 3, 1), DCOD(APR, 3, 1), DCOD(MAY, 3, 1), DCOD(JUN, 3, 1),
213 DCOD(JUL, 3, 1), DCOD(AUG, 3, 1), DCOD(SEP, 3, 1), DCOD(OCT, 3, 1),
214 DCOD(NOV, 3, 1), DCOD(DEC, 3, 1), 0, 0
215};
216
217void
145
146 if (dhp != NULL)
147 *dhp = (tsp->tv_sec & 1) * 100 + tsp->tv_nsec / 10000000;
148 if (dtp != NULL) {
149 *dtp = (t1 / 2) % 30;
150 *dtp |= ((t1 / 60) % 60) << 5;
151 *dtp |= ((t1 / 3600) % 24) << 11;
152 }

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209 DCOD(NOV, 2, 1), DCOD(DEC, 2, 1), 0, 0,
210 0, DCOD( 0, 3, 1), DCOD(JAN, 3, 1), DCOD(FEB, 3, 1),
211 DCOD(MAR, 3, 1), DCOD(APR, 3, 1), DCOD(MAY, 3, 1), DCOD(JUN, 3, 1),
212 DCOD(JUL, 3, 1), DCOD(AUG, 3, 1), DCOD(SEP, 3, 1), DCOD(OCT, 3, 1),
213 DCOD(NOV, 3, 1), DCOD(DEC, 3, 1), 0, 0
214};
215
216void
218fattime2timespec(unsigned dd, unsigned dt, unsigned dh, int utc, struct timespec *tsp)
217fattime2timet(unsigned dd, unsigned dt, unsigned dh, struct timespec *tsp)
219{
220 unsigned day;
221
222 /* Unpack time fields */
223 tsp->tv_sec = (dt & 0x1f) << 1;
224 tsp->tv_sec += ((dt & 0x7e0) >> 5) * 60;
225 tsp->tv_sec += ((dt & 0xf800) >> 11) * 3600;
226 tsp->tv_sec += dh / 100;

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241 */
242 if (day >= ((2100 - 1980) / 4 * LYC + FEB))
243 day--;
244
245 /* Align with time_t epoch */
246 day += T1980;
247
248 tsp->tv_sec += DAY * day;
218{
219 unsigned day;
220
221 /* Unpack time fields */
222 tsp->tv_sec = (dt & 0x1f) << 1;
223 tsp->tv_sec += ((dt & 0x7e0) >> 5) * 60;
224 tsp->tv_sec += ((dt & 0xf800) >> 11) * 3600;
225 tsp->tv_sec += dh / 100;

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240 */
241 if (day >= ((2100 - 1980) / 4 * LYC + FEB))
242 day--;
243
244 /* Align with time_t epoch */
245 day += T1980;
246
247 tsp->tv_sec += DAY * day;
249 if (!utc)
250 tsp->tv_sec += utc_offset();
251}
252
253#ifdef TEST_DRIVER
254
255#include <stdio.h>
256#include <unistd.h>
257#include <stdlib.h>
258

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249
250#ifdef TEST_DRIVER
251
252#include <stdio.h>
253#include <unistd.h>
254#include <stdlib.h>
255

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