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ef5f15e3 JB |
1 | /* Time support for VMS. |
2 | Copyright (C) 1993 Free Software Foundation. | |
3 | ||
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
18160b98 | 20 | #include <config.h> |
d415c517 JB |
21 | #include "vmstime.h" |
22 | ||
23 | long timezone=0; | |
24 | int daylight=0; | |
25 | ||
26 | static char tzname_default[20]=""; | |
27 | static char tzname_dst[20]=""; | |
28 | ||
29 | char *tzname[2] = { tzname_default, tzname_dst }; | |
30 | ||
31 | static long internal_daylight=0; | |
32 | static char daylight_set=0; | |
33 | ||
34 | static long read_time(const char *nptr, const char **endptr, | |
35 | int sign_allowed_p) | |
36 | { | |
37 | int t; | |
38 | ||
39 | *endptr = nptr; | |
40 | ||
41 | /* This routine trusts the user very much, and does no checks! | |
42 | The only exception is this: */ | |
43 | if (!sign_allowed_p && (*nptr == '-' || *nptr == '+')) | |
44 | return 0; | |
45 | ||
46 | t = strtol(*endptr, endptr, 10) * 3600; | |
47 | if (**endptr != ':' || **endptr == '+' || **endptr == '-') | |
48 | return t; | |
49 | (*endptr)++; | |
50 | ||
51 | t = t + strtol(*endptr, endptr, 10) * 60; | |
52 | if (**endptr != ':' || **endptr == '+' || **endptr == '-') | |
53 | return t; | |
54 | (*endptr)++; | |
55 | ||
56 | return t + strtol(*endptr, endptr, 10); | |
57 | } | |
58 | ||
59 | static void read_dst_time(const char *nptr, const char **endptr, | |
60 | int *m, int *n, int *d, | |
61 | int *leap_p) | |
62 | { | |
63 | time_t bintim = time(0); | |
64 | struct tm *lc = localtime(&bintim); | |
65 | ||
66 | *leap_p = 1; | |
67 | *m = 0; /* When m and n are 0, a Julian */ | |
68 | *n = 0; /* date has been inserted in d */ | |
69 | ||
70 | switch(*nptr) | |
71 | { | |
72 | case 'M': | |
73 | { | |
74 | /* This routine counts on the user to have specified "Mm.n.d", | |
75 | where 1 <= n <= 5, 1 <= m <= 12, 0 <= d <= 6 */ | |
76 | ||
77 | *m = strtol(++nptr, endptr, 10); | |
78 | (*endptr)++; /* Skip the dot */ | |
79 | *n = strtol(*endptr, endptr, 10); | |
80 | (*endptr)++; /* Skip the dot */ | |
81 | *d = strtol(*endptr, endptr, 10); | |
82 | ||
83 | return; | |
84 | } | |
85 | case 'J': | |
86 | *leap_p = 0; /* Never count with leap years */ | |
87 | default: /* trust the user to have inserted a number! */ | |
88 | *d = strtol(++nptr, endptr, 10); | |
89 | return; | |
90 | } | |
91 | } | |
92 | ||
93 | struct vms_vectim | |
94 | { | |
95 | short year, month, day, hour, minute, second, centi_second; | |
96 | }; | |
97 | static void find_dst_time(int m, int n, long d, | |
98 | int hour, int minute, int second, | |
99 | int leap_p, | |
100 | long vms_internal_time[2]) | |
101 | { | |
102 | long status = SYS$GETTIM(vms_internal_time); | |
103 | struct vms_vectim vms_vectime; | |
104 | status = SYS$NUMTIM(&vms_vectime, vms_internal_time); | |
105 | ||
106 | if (m == 0 && n == 0) | |
107 | { | |
108 | long tmp_vms_internal_time[2][2]; | |
109 | long day_of_year; | |
110 | long tmp_operation = LIB$K_DAY_OF_YEAR; | |
111 | ||
112 | status = LIB$CVT_FROM_INTERNAL_TIME(&tmp_operation, &day_of_year, | |
113 | vms_internal_time); | |
114 | ||
115 | vms_vectime.month = 2; | |
116 | vms_vectime.day = 29; | |
117 | status = LIB$CVT_VECTIM(&vms_vectime, tmp_vms_internal_time[0]); | |
118 | if (status & 1) /* This is a leap year */ | |
119 | { | |
120 | if (!leap_p && d > 59) | |
121 | d ++; /* If we don't count with 29th Feb, | |
122 | and this is a leap year, count up, | |
123 | to make day 60 really become the | |
124 | 1st March. */ | |
125 | } | |
126 | /* 1st January, at midnight */ | |
127 | vms_vectime.month = 1; | |
128 | vms_vectime.day = 1; | |
129 | vms_vectime.hour = hour; | |
130 | vms_vectime.minute = minute; | |
131 | vms_vectime.second = second; | |
132 | vms_vectime.centi_second = 0; | |
133 | status = LIB$CVT_VECTIM(&vms_vectime, tmp_vms_internal_time[0]); | |
134 | tmp_operation = LIB$K_DELTA_DAYS; | |
135 | status = LIB$CVT_TO_INTERNAL_TIME(&tmp_operation, &d, | |
136 | tmp_vms_internal_time[1]); | |
137 | /* now, tmp_vms_interval_time[0] contains 1st Jan, 00:00:00, | |
138 | and tmp_vms_interval_time[1] contains delta time +d days. | |
139 | Let's just add them together */ | |
140 | status = LIB$ADD_TIMES(tmp_vms_internal_time[0], | |
141 | tmp_vms_internal_time[1], | |
142 | vms_internal_time); | |
143 | } | |
144 | else | |
145 | { | |
146 | long tmp_vms_internal_time[2]; | |
147 | long day_of_week; | |
148 | long tmp_operation = LIB$K_DAY_OF_YEAR; | |
149 | ||
150 | if (d == 0) /* 0 is Sunday, which isn't compatible with VMS, | |
151 | where day_of_week is 1 -- 7, and 1 is Monday */ | |
152 | { | |
153 | d = 7; /* So a simple conversion is required */ | |
154 | } | |
155 | vms_vectime.month = m; | |
156 | vms_vectime.day = 1; | |
157 | vms_vectime.hour = hour; | |
158 | vms_vectime.minute = minute; | |
159 | vms_vectime.second = second; | |
160 | vms_vectime.centi_second = 0; | |
161 | status = LIB$CVT_VECTIM(&vms_vectime, tmp_vms_internal_time); | |
162 | tmp_operation = LIB$K_DAY_OF_WEEK; | |
163 | status = LIB$CVT_FROM_INTERNAL_TIME(&tmp_operation, &day_of_week, | |
164 | tmp_vms_internal_time); | |
165 | d -= day_of_week; | |
166 | if (d < 0) | |
167 | { | |
168 | d += 7; | |
169 | } | |
170 | vms_vectime.day += (n-1)*7 + d; | |
171 | status = LIB$CVT_VECTIM(&vms_vectime, vms_internal_time); | |
172 | if (!(status & 1)) | |
173 | { | |
174 | vms_vectime.day -= 7; /* n was probably 5 */ | |
175 | status = LIB$CVT_VECTIM(&vms_vectime, vms_internal_time); | |
176 | } | |
177 | } | |
178 | } | |
179 | ||
180 | static cmp_vms_internal_times(long vms_internal_time1[2], | |
181 | long vms_internal_time2[2]) | |
182 | { | |
183 | if (vms_internal_time1[1] < vms_internal_time2[1]) | |
184 | return -1; | |
185 | else | |
186 | if (vms_internal_time1[1] > vms_internal_time2[1]) | |
187 | return 1; | |
188 | ||
189 | if (vms_internal_time1[0] < vms_internal_time2[0]) | |
190 | return -1; | |
191 | else | |
192 | if (vms_internal_time1[0] > vms_internal_time2[0]) | |
193 | return 1; | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | /* -------------------------- Global routines ------------------------------ */ | |
199 | ||
200 | #ifdef tzset | |
201 | #undef tzset | |
202 | #endif | |
203 | void sys_tzset() | |
204 | { | |
205 | char *TZ; | |
206 | char *p, *q; | |
207 | ||
208 | if (daylight_set) | |
209 | return; | |
210 | ||
211 | daylight = 0; | |
212 | ||
213 | if ((TZ = getenv("TZ")) == 0) | |
214 | return; | |
215 | ||
216 | p = TZ; | |
217 | q = tzname[0]; | |
218 | ||
219 | while(*p != '\0' | |
220 | && (*p <'0' || *p > '9') && *p != '-' && *p != '+' && *p != ',') | |
221 | *q++ = *p++; | |
222 | *q = '\0'; | |
223 | ||
224 | /* This is special for VMS, so I don't care if it doesn't exist anywhere | |
225 | else */ | |
226 | ||
227 | timezone = read_time(p, &p, 1); | |
228 | ||
229 | q = tzname[1]; | |
230 | ||
231 | while(*p != '\0' | |
232 | && (*p <'0' || *p > '9') && *p != '-' && *p != '+' && *p != ',') | |
233 | *q++ = *p++; | |
234 | *q = '\0'; | |
235 | ||
236 | if (*p != '-' && *p != '+' && !(*p >='0' && *p <= '9')) | |
237 | internal_daylight = timezone - 3600; | |
238 | else | |
239 | internal_daylight = read_time(p, &p, 1); | |
240 | ||
241 | if (*p == ',') | |
242 | { | |
243 | int start_m; | |
244 | int start_n; | |
245 | int start_d; | |
246 | int start_leap_p; | |
247 | int start_hour=2, start_minute=0, start_second=0; | |
248 | ||
249 | p++; | |
250 | read_dst_time(p, &p, &start_m, &start_n, &start_d, &start_leap_p); | |
251 | if (*p == '/') | |
252 | { | |
253 | long tmp = read_time (++p, &p, 0); | |
254 | start_hour = tmp / 3600; | |
255 | start_minute = (tmp % 3600) / 60; | |
256 | start_second = tmp % 60; | |
257 | } | |
258 | if (*p == ',') | |
259 | { | |
260 | int end_m; | |
261 | int end_n; | |
262 | int end_d; | |
263 | int end_leap_p; | |
264 | int end_hour=2, end_minute=0, end_second=0; | |
265 | ||
266 | p++; | |
267 | read_dst_time(p, &p, &end_m, &end_n, &end_d, &end_leap_p); | |
268 | if (*p == '/') | |
269 | { | |
270 | long tmp = read_time (++p, &p, 0); | |
271 | end_hour = tmp / 3600; | |
272 | end_minute = (tmp % 3600) / 60; | |
273 | end_second = tmp % 60; | |
274 | } | |
275 | { | |
276 | long vms_internal_time[3][2]; | |
277 | find_dst_time(start_m, start_n, start_d, | |
278 | start_hour, start_minute, start_second, | |
279 | start_leap_p, | |
280 | vms_internal_time[0]); | |
281 | SYS$GETTIM(&vms_internal_time[1]); | |
282 | find_dst_time(end_m, end_n, end_d, | |
283 | end_hour, end_minute, end_second, | |
284 | end_leap_p, | |
285 | vms_internal_time[2]); | |
286 | if (cmp_vms_internal_times(vms_internal_time[0], | |
287 | vms_internal_time[1]) < 0 | |
288 | && cmp_vms_internal_times(vms_internal_time[1], | |
289 | vms_internal_time[2]) < 0) | |
290 | daylight = 1; | |
291 | } | |
292 | } | |
293 | } | |
294 | } | |
295 | ||
296 | #ifdef localtime | |
297 | #undef localtime | |
298 | #endif | |
299 | struct tm *sys_localtime(time_t *clock) | |
300 | { | |
301 | struct tm *tmp = localtime(clock); | |
302 | ||
303 | sys_tzset(); | |
304 | tmp->tm_isdst = daylight; | |
305 | ||
306 | return tmp; | |
307 | } | |
308 | ||
309 | #ifdef gmtime | |
310 | #undef gmtime | |
311 | #endif | |
312 | struct tm *sys_gmtime(time_t *clock) | |
313 | { | |
314 | static struct tm gmt; | |
315 | struct vms_vectim tmp_vectime; | |
316 | long vms_internal_time[3][2]; | |
317 | long tmp_operation = LIB$K_DELTA_SECONDS; | |
318 | long status; | |
319 | long tmp_offset; | |
320 | char tmp_o_sign; | |
321 | ||
322 | sys_tzset(); | |
323 | ||
324 | if (daylight) | |
325 | tmp_offset = internal_daylight; | |
326 | else | |
327 | tmp_offset = timezone; | |
328 | ||
329 | if (tmp_offset < 0) | |
330 | { | |
331 | tmp_o_sign = -1; | |
332 | tmp_offset = -tmp_offset; | |
333 | } | |
334 | else | |
335 | tmp_o_sign = 1; | |
336 | ||
337 | status = LIB$CVT_TO_INTERNAL_TIME(&tmp_operation, &tmp_offset, | |
338 | vms_internal_time[1]); | |
339 | status = SYS$GETTIM(vms_internal_time[0]); | |
340 | if (tmp_o_sign < 0) | |
341 | { | |
342 | status = LIB$SUB_TIMES(vms_internal_time[0], | |
343 | vms_internal_time[1], | |
344 | vms_internal_time[2]); | |
345 | } | |
346 | else | |
347 | { | |
348 | status = LIB$ADD_TIMES(vms_internal_time[0], | |
349 | vms_internal_time[1], | |
350 | vms_internal_time[2]); | |
351 | } | |
352 | ||
353 | status = SYS$NUMTIM(&tmp_vectime, vms_internal_time[2]); | |
354 | gmt.tm_sec = tmp_vectime.second; | |
355 | gmt.tm_min = tmp_vectime.minute; | |
356 | gmt.tm_hour = tmp_vectime.hour; | |
357 | gmt.tm_mday = tmp_vectime.day; | |
358 | gmt.tm_mon = tmp_vectime.month - 1; | |
359 | gmt.tm_year = tmp_vectime.year % 100; | |
360 | ||
361 | tmp_operation = LIB$K_DAY_OF_WEEK; | |
362 | status = LIB$CVT_FROM_INTERNAL_TIME(&tmp_operation, | |
363 | &gmt.tm_wday, | |
364 | vms_internal_time[2]); | |
365 | if (gmt.tm_wday == 7) gmt.tm_wday = 0; | |
366 | ||
367 | tmp_operation = LIB$K_DAY_OF_YEAR; | |
368 | status = LIB$CVT_FROM_INTERNAL_TIME(&tmp_operation, | |
369 | &gmt.tm_yday, | |
370 | vms_internal_time[2]); | |
371 | gmt.tm_yday--; | |
372 | gmt.tm_isdst = daylight; | |
373 | ||
374 | return &gmt; | |
375 | } | |
376 |