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Commit | Line | Data |
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f7a9f785 | 1 | /* Copyright (C) 1991-2016 Free Software Foundation, Inc. |
860d3729 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
860d3729 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 8 | |
860d3729 UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
a3e0e9ae UD |
18 | #include <assert.h> |
19 | #include <limits.h> | |
28f540f4 | 20 | #include <stdio.h> |
2706ee38 | 21 | #include <stdio_ext.h> |
a3e0e9ae | 22 | #include <stdlib.h> |
28f540f4 | 23 | #include <string.h> |
a3e0e9ae | 24 | #include <time.h> |
9d187dd4 | 25 | #include <unistd.h> |
fe6cc2ae | 26 | #include <sys/stat.h> |
3b60b421 | 27 | #include <stdint.h> |
28f540f4 RM |
28 | |
29 | #define NOID | |
14ea22e9 | 30 | #include <timezone/tzfile.h> |
28f540f4 | 31 | |
c4563d2d | 32 | int __use_tzfile; |
fe6cc2ae UD |
33 | static dev_t tzfile_dev; |
34 | static ino64_t tzfile_ino; | |
8930fcf9 | 35 | static time_t tzfile_mtime; |
28f540f4 RM |
36 | |
37 | struct ttinfo | |
38 | { | |
39 | long int offset; /* Seconds east of GMT. */ | |
40 | unsigned char isdst; /* Used to set tm_isdst. */ | |
41 | unsigned char idx; /* Index into `zone_names'. */ | |
98fa1d6e RM |
42 | unsigned char isstd; /* Transition times are in standard time. */ |
43 | unsigned char isgmt; /* Transition times are in GMT. */ | |
28f540f4 RM |
44 | }; |
45 | ||
46 | struct leap | |
47 | { | |
48 | time_t transition; /* Time the transition takes effect. */ | |
49 | long int change; /* Seconds of correction to apply. */ | |
50 | }; | |
51 | ||
dfd2257a | 52 | static void compute_tzname_max (size_t) internal_function; |
28f540f4 RM |
53 | |
54 | static size_t num_transitions; | |
c877418f | 55 | libc_freeres_ptr (static time_t *transitions); |
c4563d2d | 56 | static unsigned char *type_idxs; |
28f540f4 | 57 | static size_t num_types; |
c4563d2d UD |
58 | static struct ttinfo *types; |
59 | static char *zone_names; | |
ff152e3f UD |
60 | static long int rule_stdoff; |
61 | static long int rule_dstoff; | |
28f540f4 | 62 | static size_t num_leaps; |
c4563d2d | 63 | static struct leap *leaps; |
fa76dde2 | 64 | static char *tzspec; |
28f540f4 | 65 | |
a2cafe30 | 66 | #include <endian.h> |
ba9234d9 | 67 | #include <byteswap.h> |
a2cafe30 RM |
68 | |
69 | /* Decode the four bytes at PTR as a signed integer in network byte order. */ | |
70 | static inline int | |
9c7ff11a | 71 | __attribute ((always_inline)) |
a2cafe30 RM |
72 | decode (const void *ptr) |
73 | { | |
11bf311e | 74 | if (BYTE_ORDER == BIG_ENDIAN && sizeof (int) == 4) |
b20e47cb | 75 | return *(const int *) ptr; |
11bf311e | 76 | if (sizeof (int) == 4) |
ba9234d9 | 77 | return bswap_32 (*(const int *) ptr); |
b20e47cb | 78 | |
11bf311e UD |
79 | const unsigned char *p = ptr; |
80 | int result = *p & (1 << (CHAR_BIT - 1)) ? ~0 : 0; | |
064737fb | 81 | |
11bf311e UD |
82 | result = (result << 8) | *p++; |
83 | result = (result << 8) | *p++; | |
84 | result = (result << 8) | *p++; | |
85 | result = (result << 8) | *p++; | |
86 | ||
87 | return result; | |
064737fb UD |
88 | } |
89 | ||
11bf311e UD |
90 | |
91 | static inline int64_t | |
92 | __attribute ((always_inline)) | |
93 | decode64 (const void *ptr) | |
94 | { | |
95 | if ((BYTE_ORDER == BIG_ENDIAN)) | |
96 | return *(const int64_t *) ptr; | |
97 | ||
98 | return bswap_64 (*(const int64_t *) ptr); | |
99 | } | |
100 | ||
101 | ||
28f540f4 | 102 | void |
c4563d2d | 103 | __tzfile_read (const char *file, size_t extra, char **extrap) |
28f540f4 | 104 | { |
9d187dd4 | 105 | static const char default_tzdir[] = TZDIR; |
98fa1d6e | 106 | size_t num_isstd, num_isgmt; |
2e09a79a | 107 | FILE *f; |
28f540f4 RM |
108 | struct tzhead tzhead; |
109 | size_t chars; | |
2e09a79a | 110 | size_t i; |
c4563d2d UD |
111 | size_t total_size; |
112 | size_t types_idx; | |
113 | size_t leaps_idx; | |
fe6cc2ae | 114 | int was_using_tzfile = __use_tzfile; |
11bf311e | 115 | int trans_width = 4; |
fa76dde2 | 116 | size_t tzspec_len; |
45c30c61 | 117 | char *new = NULL; |
11bf311e UD |
118 | |
119 | if (sizeof (time_t) != 4 && sizeof (time_t) != 8) | |
120 | abort (); | |
28f540f4 RM |
121 | |
122 | __use_tzfile = 0; | |
123 | ||
a3b58440 RM |
124 | if (file == NULL) |
125 | /* No user specification; use the site-wide default. */ | |
28f540f4 | 126 | file = TZDEFAULT; |
a3b58440 | 127 | else if (*file == '\0') |
9a0a462c | 128 | /* User specified the empty string; use UTC with no leap seconds. */ |
640b76b7 | 129 | goto ret_free_transitions; |
1228ed5c UD |
130 | else |
131 | { | |
132 | /* We must not allow to read an arbitrary file in a setuid | |
133 | program. So we fail for any file which is not in the | |
7434ccad UD |
134 | directory hierachy starting at TZDIR |
135 | and which is not the system wide default TZDEFAULT. */ | |
1228ed5c UD |
136 | if (__libc_enable_secure |
137 | && ((*file == '/' | |
4cca6b86 | 138 | && memcmp (file, TZDEFAULT, sizeof TZDEFAULT) |
1228ed5c UD |
139 | && memcmp (file, default_tzdir, sizeof (default_tzdir) - 1)) |
140 | || strstr (file, "../") != NULL)) | |
7434ccad UD |
141 | /* This test is certainly a bit too restrictive but it should |
142 | catch all critical cases. */ | |
640b76b7 | 143 | goto ret_free_transitions; |
1228ed5c | 144 | } |
9d187dd4 | 145 | |
28f540f4 RM |
146 | if (*file != '/') |
147 | { | |
5290baf0 | 148 | const char *tzdir; |
5290baf0 | 149 | |
74955460 | 150 | tzdir = getenv ("TZDIR"); |
5290baf0 | 151 | if (tzdir == NULL || *tzdir == '\0') |
45c30c61 OB |
152 | tzdir = default_tzdir; |
153 | if (__asprintf (&new, "%s/%s", tzdir, file) == -1) | |
154 | goto ret_free_transitions; | |
28f540f4 RM |
155 | file = new; |
156 | } | |
157 | ||
250ecb48 UD |
158 | /* If we were already using tzfile, check whether the file changed. */ |
159 | struct stat64 st; | |
160 | if (was_using_tzfile | |
161 | && stat64 (file, &st) == 0 | |
162 | && tzfile_ino == st.st_ino && tzfile_dev == st.st_dev | |
163 | && tzfile_mtime == st.st_mtime) | |
45c30c61 | 164 | goto done; /* Nothing to do. */ |
250ecb48 | 165 | |
ee8449f7 | 166 | /* Note the file is opened with cancellation in the I/O functions |
82af0fa8 UD |
167 | disabled and if available FD_CLOEXEC set. */ |
168 | f = fopen (file, "rce"); | |
28f540f4 | 169 | if (f == NULL) |
640b76b7 | 170 | goto ret_free_transitions; |
28f540f4 | 171 | |
250ecb48 | 172 | /* Get information about the file we are actually using. */ |
5a6fa4d7 | 173 | if (fstat64 (__fileno (f), &st) != 0) |
fe6cc2ae UD |
174 | { |
175 | fclose (f); | |
640b76b7 | 176 | goto ret_free_transitions; |
fe6cc2ae | 177 | } |
fe6cc2ae | 178 | |
640b76b7 UD |
179 | free ((void *) transitions); |
180 | transitions = NULL; | |
181 | ||
8930fcf9 | 182 | /* Remember the inode and device number and modification time. */ |
fe6cc2ae UD |
183 | tzfile_dev = st.st_dev; |
184 | tzfile_ino = st.st_ino; | |
8930fcf9 | 185 | tzfile_mtime = st.st_mtime; |
fe6cc2ae | 186 | |
2706ee38 UD |
187 | /* No threads reading this stream. */ |
188 | __fsetlocking (f, FSETLOCKING_BYCALLER); | |
189 | ||
11bf311e | 190 | read_again: |
5a6fa4d7 JM |
191 | if (__builtin_expect (__fread_unlocked ((void *) &tzhead, sizeof (tzhead), |
192 | 1, f) != 1, 0) | |
11bf311e | 193 | || memcmp (tzhead.tzh_magic, TZ_MAGIC, sizeof (tzhead.tzh_magic)) != 0) |
28f540f4 RM |
194 | goto lose; |
195 | ||
a2cafe30 RM |
196 | num_transitions = (size_t) decode (tzhead.tzh_timecnt); |
197 | num_types = (size_t) decode (tzhead.tzh_typecnt); | |
198 | chars = (size_t) decode (tzhead.tzh_charcnt); | |
199 | num_leaps = (size_t) decode (tzhead.tzh_leapcnt); | |
200 | num_isstd = (size_t) decode (tzhead.tzh_ttisstdcnt); | |
201 | num_isgmt = (size_t) decode (tzhead.tzh_ttisgmtcnt); | |
28f540f4 | 202 | |
42261ad7 FW |
203 | if (__glibc_unlikely (num_isstd > num_types || num_isgmt > num_types)) |
204 | goto lose; | |
205 | ||
11bf311e UD |
206 | /* For platforms with 64-bit time_t we use the new format if available. */ |
207 | if (sizeof (time_t) == 8 && trans_width == 4 | |
208 | && tzhead.tzh_version[0] != '\0') | |
209 | { | |
210 | /* We use the 8-byte format. */ | |
211 | trans_width = 8; | |
212 | ||
213 | /* Position the stream before the second header. */ | |
214 | size_t to_skip = (num_transitions * (4 + 1) | |
215 | + num_types * 6 | |
216 | + chars | |
217 | + num_leaps * 8 | |
218 | + num_isstd | |
219 | + num_isgmt); | |
220 | if (fseek (f, to_skip, SEEK_CUR) != 0) | |
221 | goto lose; | |
222 | ||
223 | goto read_again; | |
224 | } | |
225 | ||
97ac2654 UD |
226 | if (__builtin_expect (num_transitions |
227 | > ((SIZE_MAX - (__alignof__ (struct ttinfo) - 1)) | |
228 | / (sizeof (time_t) + 1)), 0)) | |
229 | goto lose; | |
c4563d2d UD |
230 | total_size = num_transitions * (sizeof (time_t) + 1); |
231 | total_size = ((total_size + __alignof__ (struct ttinfo) - 1) | |
232 | & ~(__alignof__ (struct ttinfo) - 1)); | |
233 | types_idx = total_size; | |
97ac2654 UD |
234 | if (__builtin_expect (num_types |
235 | > (SIZE_MAX - total_size) / sizeof (struct ttinfo), 0)) | |
236 | goto lose; | |
237 | total_size += num_types * sizeof (struct ttinfo); | |
a1ffb40e | 238 | if (__glibc_unlikely (chars > SIZE_MAX - total_size)) |
97ac2654 UD |
239 | goto lose; |
240 | total_size += chars; | |
241 | if (__builtin_expect (__alignof__ (struct leap) - 1 | |
242 | > SIZE_MAX - total_size, 0)) | |
243 | goto lose; | |
c4563d2d UD |
244 | total_size = ((total_size + __alignof__ (struct leap) - 1) |
245 | & ~(__alignof__ (struct leap) - 1)); | |
246 | leaps_idx = total_size; | |
97ac2654 UD |
247 | if (__builtin_expect (num_leaps |
248 | > (SIZE_MAX - total_size) / sizeof (struct leap), 0)) | |
249 | goto lose; | |
c4563d2d | 250 | total_size += num_leaps * sizeof (struct leap); |
97ac2654 UD |
251 | tzspec_len = 0; |
252 | if (sizeof (time_t) == 8 && trans_width == 8) | |
253 | { | |
5a6fa4d7 | 254 | off_t rem = st.st_size - __ftello (f); |
97ac2654 UD |
255 | if (__builtin_expect (rem < 0 |
256 | || (size_t) rem < (num_transitions * (8 + 1) | |
257 | + num_types * 6 | |
258 | + chars), 0)) | |
259 | goto lose; | |
260 | tzspec_len = (size_t) rem - (num_transitions * (8 + 1) | |
261 | + num_types * 6 | |
262 | + chars); | |
263 | if (__builtin_expect (num_leaps > SIZE_MAX / 12 | |
264 | || tzspec_len < num_leaps * 12, 0)) | |
265 | goto lose; | |
266 | tzspec_len -= num_leaps * 12; | |
a1ffb40e | 267 | if (__glibc_unlikely (tzspec_len < num_isstd)) |
97ac2654 UD |
268 | goto lose; |
269 | tzspec_len -= num_isstd; | |
a1ffb40e | 270 | if (__glibc_unlikely (tzspec_len == 0 || tzspec_len - 1 < num_isgmt)) |
97ac2654 UD |
271 | goto lose; |
272 | tzspec_len -= num_isgmt + 1; | |
5cffc05e L |
273 | if (__glibc_unlikely (tzspec_len == 0 |
274 | || SIZE_MAX - total_size < tzspec_len)) | |
97ac2654 UD |
275 | goto lose; |
276 | } | |
a1ffb40e | 277 | if (__glibc_unlikely (SIZE_MAX - total_size - tzspec_len < extra)) |
97ac2654 | 278 | goto lose; |
c4563d2d | 279 | |
11bf311e UD |
280 | /* Allocate enough memory including the extra block requested by the |
281 | caller. */ | |
fa76dde2 | 282 | transitions = (time_t *) malloc (total_size + tzspec_len + extra); |
c4563d2d UD |
283 | if (transitions == NULL) |
284 | goto lose; | |
285 | ||
286 | type_idxs = (unsigned char *) transitions + (num_transitions | |
287 | * sizeof (time_t)); | |
288 | types = (struct ttinfo *) ((char *) transitions + types_idx); | |
289 | zone_names = (char *) types + num_types * sizeof (struct ttinfo); | |
290 | leaps = (struct leap *) ((char *) transitions + leaps_idx); | |
6a649d25 | 291 | if (sizeof (time_t) == 8 && trans_width == 8) |
69819d92 | 292 | tzspec = (char *) leaps + num_leaps * sizeof (struct leap) + extra; |
fa76dde2 UD |
293 | else |
294 | tzspec = NULL; | |
c4563d2d UD |
295 | if (extra > 0) |
296 | *extrap = (char *) &leaps[num_leaps]; | |
297 | ||
6a649d25 | 298 | if (sizeof (time_t) == 4 || __builtin_expect (trans_width == 8, 1)) |
28f540f4 | 299 | { |
5a6fa4d7 JM |
300 | if (__builtin_expect (__fread_unlocked (transitions, trans_width + 1, |
301 | num_transitions, f) | |
11bf311e | 302 | != num_transitions, 0)) |
28f540f4 RM |
303 | goto lose; |
304 | } | |
c4563d2d | 305 | else |
28f540f4 | 306 | { |
5a6fa4d7 JM |
307 | if (__builtin_expect (__fread_unlocked (transitions, 4, |
308 | num_transitions, f) | |
9c7ff11a | 309 | != num_transitions, 0) |
5a6fa4d7 JM |
310 | || __builtin_expect (__fread_unlocked (type_idxs, 1, num_transitions, |
311 | f) != num_transitions, 0)) | |
28f540f4 RM |
312 | goto lose; |
313 | } | |
314 | ||
5290baf0 UD |
315 | /* Check for bogus indices in the data file, so we can hereafter |
316 | safely use type_idxs[T] as indices into `types' and never crash. */ | |
317 | for (i = 0; i < num_transitions; ++i) | |
a1ffb40e | 318 | if (__glibc_unlikely (type_idxs[i] >= num_types)) |
5290baf0 UD |
319 | goto lose; |
320 | ||
11bf311e UD |
321 | if ((BYTE_ORDER != BIG_ENDIAN && (sizeof (time_t) == 4 || trans_width == 4)) |
322 | || (BYTE_ORDER == BIG_ENDIAN && sizeof (time_t) == 8 | |
323 | && trans_width == 4)) | |
a2cafe30 RM |
324 | { |
325 | /* Decode the transition times, stored as 4-byte integers in | |
326 | network (big-endian) byte order. We work from the end of | |
327 | the array so as not to clobber the next element to be | |
328 | processed when sizeof (time_t) > 4. */ | |
329 | i = num_transitions; | |
b20e47cb | 330 | while (i-- > 0) |
a3e0e9ae | 331 | transitions[i] = decode ((char *) transitions + i * 4); |
a2cafe30 | 332 | } |
11bf311e UD |
333 | else if (BYTE_ORDER != BIG_ENDIAN && sizeof (time_t) == 8) |
334 | { | |
335 | /* Decode the transition times, stored as 8-byte integers in | |
336 | network (big-endian) byte order. */ | |
337 | for (i = 0; i < num_transitions; ++i) | |
338 | transitions[i] = decode64 ((char *) transitions + i * 8); | |
339 | } | |
28f540f4 RM |
340 | |
341 | for (i = 0; i < num_types; ++i) | |
342 | { | |
343 | unsigned char x[4]; | |
c4563d2d | 344 | int c; |
5a6fa4d7 JM |
345 | if (__builtin_expect (__fread_unlocked (x, 1, |
346 | sizeof (x), f) != sizeof (x), | |
9c7ff11a | 347 | 0)) |
28f540f4 | 348 | goto lose; |
c4563d2d | 349 | c = getc_unlocked (f); |
a1ffb40e | 350 | if (__glibc_unlikely ((unsigned int) c > 1u)) |
8b7fb588 | 351 | goto lose; |
c4563d2d UD |
352 | types[i].isdst = c; |
353 | c = getc_unlocked (f); | |
a1ffb40e | 354 | if (__glibc_unlikely ((size_t) c > chars)) |
9c7ff11a | 355 | /* Bogus index in data file. */ |
5290baf0 | 356 | goto lose; |
c4563d2d | 357 | types[i].idx = c; |
a2cafe30 | 358 | types[i].offset = (long int) decode (x); |
28f540f4 RM |
359 | } |
360 | ||
5a6fa4d7 | 361 | if (__glibc_unlikely (__fread_unlocked (zone_names, 1, chars, f) != chars)) |
28f540f4 RM |
362 | goto lose; |
363 | ||
364 | for (i = 0; i < num_leaps; ++i) | |
365 | { | |
11bf311e | 366 | unsigned char x[8]; |
5a6fa4d7 | 367 | if (__builtin_expect (__fread_unlocked (x, 1, trans_width, f) |
11bf311e | 368 | != trans_width, 0)) |
28f540f4 | 369 | goto lose; |
11bf311e UD |
370 | if (sizeof (time_t) == 4 || trans_width == 4) |
371 | leaps[i].transition = (time_t) decode (x); | |
372 | else | |
373 | leaps[i].transition = (time_t) decode64 (x); | |
374 | ||
5a6fa4d7 | 375 | if (__glibc_unlikely (__fread_unlocked (x, 1, 4, f) != 4)) |
28f540f4 | 376 | goto lose; |
a2cafe30 | 377 | leaps[i].change = (long int) decode (x); |
28f540f4 RM |
378 | } |
379 | ||
380 | for (i = 0; i < num_isstd; ++i) | |
381 | { | |
ba9234d9 | 382 | int c = getc_unlocked (f); |
a1ffb40e | 383 | if (__glibc_unlikely (c == EOF)) |
28f540f4 RM |
384 | goto lose; |
385 | types[i].isstd = c != 0; | |
386 | } | |
387 | while (i < num_types) | |
388 | types[i++].isstd = 0; | |
389 | ||
98fa1d6e RM |
390 | for (i = 0; i < num_isgmt; ++i) |
391 | { | |
ba9234d9 | 392 | int c = getc_unlocked (f); |
a1ffb40e | 393 | if (__glibc_unlikely (c == EOF)) |
98fa1d6e RM |
394 | goto lose; |
395 | types[i].isgmt = c != 0; | |
396 | } | |
397 | while (i < num_types) | |
398 | types[i++].isgmt = 0; | |
399 | ||
fa76dde2 | 400 | /* Read the POSIX TZ-style information if possible. */ |
c6d381d3 | 401 | if (sizeof (time_t) == 8 && tzspec != NULL) |
fa76dde2 UD |
402 | { |
403 | /* Skip over the newline first. */ | |
404 | if (getc_unlocked (f) != '\n' | |
5a6fa4d7 | 405 | || (__fread_unlocked (tzspec, 1, tzspec_len - 1, f) |
c6d381d3 | 406 | != tzspec_len - 1)) |
fa76dde2 UD |
407 | tzspec = NULL; |
408 | else | |
409 | tzspec[tzspec_len - 1] = '\0'; | |
410 | } | |
94a749f6 | 411 | else if (sizeof (time_t) == 4 && tzhead.tzh_version[0] != '\0') |
c6d381d3 UD |
412 | { |
413 | /* Get the TZ string. */ | |
5a6fa4d7 JM |
414 | if (__builtin_expect (__fread_unlocked ((void *) &tzhead, |
415 | sizeof (tzhead), 1, f) != 1, 0) | |
c6d381d3 UD |
416 | || (memcmp (tzhead.tzh_magic, TZ_MAGIC, sizeof (tzhead.tzh_magic)) |
417 | != 0)) | |
418 | goto lose; | |
419 | ||
420 | size_t num_transitions2 = (size_t) decode (tzhead.tzh_timecnt); | |
421 | size_t num_types2 = (size_t) decode (tzhead.tzh_typecnt); | |
422 | size_t chars2 = (size_t) decode (tzhead.tzh_charcnt); | |
423 | size_t num_leaps2 = (size_t) decode (tzhead.tzh_leapcnt); | |
424 | size_t num_isstd2 = (size_t) decode (tzhead.tzh_ttisstdcnt); | |
425 | size_t num_isgmt2 = (size_t) decode (tzhead.tzh_ttisgmtcnt); | |
426 | ||
427 | /* Position the stream before the second header. */ | |
428 | size_t to_skip = (num_transitions2 * (8 + 1) | |
429 | + num_types2 * 6 | |
430 | + chars2 | |
431 | + num_leaps2 * 12 | |
432 | + num_isstd2 | |
433 | + num_isgmt2); | |
434 | off_t off; | |
435 | if (fseek (f, to_skip, SEEK_CUR) != 0 | |
5a6fa4d7 | 436 | || (off = __ftello (f)) < 0 |
c6d381d3 UD |
437 | || st.st_size < off + 2) |
438 | goto lose; | |
439 | ||
440 | tzspec_len = st.st_size - off - 1; | |
42261ad7 FW |
441 | if (tzspec_len == 0) |
442 | goto lose; | |
443 | char *tzstr = malloc (tzspec_len); | |
444 | if (tzstr == NULL) | |
445 | goto lose; | |
c6d381d3 | 446 | if (getc_unlocked (f) != '\n' |
5a6fa4d7 JM |
447 | || (__fread_unlocked (tzstr, 1, tzspec_len - 1, f) |
448 | != tzspec_len - 1)) | |
42261ad7 FW |
449 | { |
450 | free (tzstr); | |
451 | goto lose; | |
452 | } | |
c6d381d3 UD |
453 | tzstr[tzspec_len - 1] = '\0'; |
454 | tzspec = __tzstring (tzstr); | |
42261ad7 | 455 | free (tzstr); |
c6d381d3 | 456 | } |
11bf311e | 457 | |
7a7c2c24 AS |
458 | /* Don't use an empty TZ string. */ |
459 | if (tzspec != NULL && tzspec[0] == '\0') | |
460 | tzspec = NULL; | |
461 | ||
860d3729 UD |
462 | fclose (f); |
463 | ||
a3e0e9ae UD |
464 | /* First "register" all timezone names. */ |
465 | for (i = 0; i < num_types; ++i) | |
466 | (void) __tzstring (&zone_names[types[i].idx]); | |
467 | ||
ff152e3f UD |
468 | /* Find the standard and daylight time offsets used by the rule file. |
469 | We choose the offsets in the types of each flavor that are | |
470 | transitioned to earliest in time. */ | |
a3e0e9ae | 471 | __tzname[0] = NULL; |
ff152e3f | 472 | __tzname[1] = NULL; |
a3e0e9ae UD |
473 | for (i = num_transitions; i > 0; ) |
474 | { | |
475 | int type = type_idxs[--i]; | |
476 | int dst = types[type].isdst; | |
a3e0e9ae UD |
477 | |
478 | if (__tzname[dst] == NULL) | |
479 | { | |
d3345073 UD |
480 | int idx = types[type].idx; |
481 | ||
a3e0e9ae UD |
482 | __tzname[dst] = __tzstring (&zone_names[idx]); |
483 | ||
484 | if (__tzname[1 - dst] != NULL) | |
485 | break; | |
486 | } | |
487 | } | |
488 | if (__tzname[0] == NULL) | |
489 | { | |
490 | /* This should only happen if there are no transition rules. | |
491 | In this case there should be only one single type. */ | |
492 | assert (num_types == 1); | |
493 | __tzname[0] = __tzstring (zone_names); | |
494 | } | |
ff152e3f UD |
495 | if (__tzname[1] == NULL) |
496 | __tzname[1] = __tzname[0]; | |
28f540f4 RM |
497 | |
498 | compute_tzname_max (chars); | |
a3b58440 | 499 | |
90865aa8 | 500 | if (num_transitions == 0) |
0155a773 | 501 | /* Use the first rule (which should also be the only one). */ |
90865aa8 UD |
502 | rule_stdoff = rule_dstoff = types[0].offset; |
503 | else | |
ff152e3f | 504 | { |
d16e36e0 | 505 | int stdoff_set = 0, dstoff_set = 0; |
90865aa8 | 506 | rule_stdoff = rule_dstoff = 0; |
d3345073 UD |
507 | i = num_transitions - 1; |
508 | do | |
90865aa8 | 509 | { |
d16e36e0 AS |
510 | if (!stdoff_set && !types[type_idxs[i]].isdst) |
511 | { | |
512 | stdoff_set = 1; | |
513 | rule_stdoff = types[type_idxs[i]].offset; | |
514 | } | |
d3345073 | 515 | else if (!dstoff_set && types[type_idxs[i]].isdst) |
d16e36e0 AS |
516 | { |
517 | dstoff_set = 1; | |
518 | rule_dstoff = types[type_idxs[i]].offset; | |
519 | } | |
520 | if (stdoff_set && dstoff_set) | |
90865aa8 UD |
521 | break; |
522 | } | |
d3345073 UD |
523 | while (i-- > 0); |
524 | ||
d16e36e0 AS |
525 | if (!dstoff_set) |
526 | rule_dstoff = rule_stdoff; | |
ff152e3f UD |
527 | } |
528 | ||
529 | __daylight = rule_stdoff != rule_dstoff; | |
530 | __timezone = -rule_stdoff; | |
531 | ||
45c30c61 | 532 | done: |
28f540f4 | 533 | __use_tzfile = 1; |
45c30c61 | 534 | free (new); |
28f540f4 RM |
535 | return; |
536 | ||
ba9234d9 UD |
537 | lose: |
538 | fclose (f); | |
640b76b7 | 539 | ret_free_transitions: |
45c30c61 | 540 | free (new); |
640b76b7 UD |
541 | free ((void *) transitions); |
542 | transitions = NULL; | |
28f540f4 RM |
543 | } |
544 | \f | |
98fa1d6e RM |
545 | /* The user specified a hand-made timezone, but not its DST rules. |
546 | We will use the names and offsets from the user, and the rules | |
547 | from the TZDEFRULES file. */ | |
548 | ||
28f540f4 | 549 | void |
cd6ede75 UD |
550 | __tzfile_default (const char *std, const char *dst, |
551 | long int stdoff, long int dstoff) | |
28f540f4 | 552 | { |
c4563d2d UD |
553 | size_t stdlen = strlen (std) + 1; |
554 | size_t dstlen = strlen (dst) + 1; | |
555 | size_t i; | |
98fa1d6e | 556 | int isdst; |
c4563d2d | 557 | char *cp; |
28f540f4 | 558 | |
c4563d2d | 559 | __tzfile_read (TZDEFRULES, stdlen + dstlen, &cp); |
28f540f4 RM |
560 | if (!__use_tzfile) |
561 | return; | |
562 | ||
563 | if (num_types < 2) | |
564 | { | |
565 | __use_tzfile = 0; | |
566 | return; | |
567 | } | |
568 | ||
c4563d2d UD |
569 | /* Ignore the zone names read from the file and use the given ones |
570 | instead. */ | |
571 | __mempcpy (__mempcpy (cp, std, stdlen), dst, dstlen); | |
572 | zone_names = cp; | |
28f540f4 | 573 | |
88455219 UD |
574 | /* Now there are only two zones, regardless of what the file contained. */ |
575 | num_types = 2; | |
576 | ||
98fa1d6e RM |
577 | /* Now correct the transition times for the user-specified standard and |
578 | daylight offsets from GMT. */ | |
579 | isdst = 0; | |
98fa1d6e RM |
580 | for (i = 0; i < num_transitions; ++i) |
581 | { | |
582 | struct ttinfo *trans_type = &types[type_idxs[i]]; | |
583 | ||
584 | /* We will use only types 0 (standard) and 1 (daylight). | |
585 | Fix up this transition to point to whichever matches | |
586 | the flavor of its original type. */ | |
587 | type_idxs[i] = trans_type->isdst; | |
588 | ||
589 | if (trans_type->isgmt) | |
590 | /* The transition time is in GMT. No correction to apply. */ ; | |
591 | else if (isdst && !trans_type->isstd) | |
592 | /* The type says this transition is in "local wall clock time", and | |
593 | wall clock time as of the previous transition was DST. Correct | |
594 | for the difference between the rule's DST offset and the user's | |
595 | DST offset. */ | |
596 | transitions[i] += dstoff - rule_dstoff; | |
597 | else | |
598 | /* This transition is in "local wall clock time", and wall clock | |
599 | time as of this iteration is non-DST. Correct for the | |
600 | difference between the rule's standard offset and the user's | |
601 | standard offset. */ | |
602 | transitions[i] += stdoff - rule_stdoff; | |
603 | ||
604 | /* The DST state of "local wall clock time" for the next iteration is | |
605 | as specified by this transition. */ | |
606 | isdst = trans_type->isdst; | |
607 | } | |
608 | ||
4c326621 UD |
609 | /* Now that we adjusted the transitions to the requested offsets, |
610 | reset the rule_stdoff and rule_dstoff values appropriately. They | |
611 | are used elsewhere. */ | |
612 | rule_stdoff = stdoff; | |
613 | rule_dstoff = dstoff; | |
614 | ||
98fa1d6e RM |
615 | /* Reset types 0 and 1 to describe the user's settings. */ |
616 | types[0].idx = 0; | |
617 | types[0].offset = stdoff; | |
618 | types[0].isdst = 0; | |
619 | types[1].idx = stdlen; | |
620 | types[1].offset = dstoff; | |
621 | types[1].isdst = 1; | |
28f540f4 | 622 | |
5290baf0 | 623 | /* Reset the zone names to point to the user's names. */ |
cd6ede75 UD |
624 | __tzname[0] = (char *) std; |
625 | __tzname[1] = (char *) dst; | |
5290baf0 | 626 | |
90865aa8 UD |
627 | /* Set the timezone. */ |
628 | __timezone = -types[0].offset; | |
629 | ||
28f540f4 RM |
630 | compute_tzname_max (stdlen + dstlen); |
631 | } | |
632 | \f | |
fa76dde2 UD |
633 | void |
634 | __tzfile_compute (time_t timer, int use_localtime, | |
635 | long int *leap_correct, int *leap_hit, | |
636 | struct tm *tp) | |
28f540f4 | 637 | { |
2e09a79a | 638 | size_t i; |
89dc9d4c | 639 | |
fa76dde2 | 640 | if (use_localtime) |
28f540f4 | 641 | { |
fa76dde2 UD |
642 | __tzname[0] = NULL; |
643 | __tzname[1] = NULL; | |
644 | ||
a1ffb40e | 645 | if (__glibc_unlikely (num_transitions == 0 || timer < transitions[0])) |
89dc9d4c | 646 | { |
fa76dde2 UD |
647 | /* TIMER is before any transition (or there are no transitions). |
648 | Choose the first non-DST type | |
649 | (or the first if they're all DST types). */ | |
650 | i = 0; | |
651 | while (i < num_types && types[i].isdst) | |
652 | { | |
653 | if (__tzname[1] == NULL) | |
654 | __tzname[1] = __tzstring (&zone_names[types[i].idx]); | |
89dc9d4c | 655 | |
fa76dde2 UD |
656 | ++i; |
657 | } | |
89dc9d4c | 658 | |
fa76dde2 UD |
659 | if (i == num_types) |
660 | i = 0; | |
661 | __tzname[0] = __tzstring (&zone_names[types[i].idx]); | |
662 | if (__tzname[1] == NULL) | |
663 | { | |
664 | size_t j = i; | |
665 | while (j < num_types) | |
666 | if (types[j].isdst) | |
667 | { | |
668 | __tzname[1] = __tzstring (&zone_names[types[j].idx]); | |
669 | break; | |
670 | } | |
671 | else | |
672 | ++j; | |
673 | } | |
674 | } | |
a1ffb40e | 675 | else if (__glibc_unlikely (timer >= transitions[num_transitions - 1])) |
89dc9d4c | 676 | { |
a1ffb40e | 677 | if (__glibc_unlikely (tzspec == NULL)) |
fa76dde2 UD |
678 | { |
679 | use_last: | |
e2cceb5a | 680 | i = num_transitions; |
fa76dde2 UD |
681 | goto found; |
682 | } | |
683 | ||
684 | /* Parse the POSIX TZ-style string. */ | |
685 | __tzset_parse_tz (tzspec); | |
686 | ||
687 | /* Convert to broken down structure. If this fails do not | |
688 | use the string. */ | |
a1ffb40e | 689 | if (__glibc_unlikely (! __offtime (&timer, 0, tp))) |
fa76dde2 UD |
690 | goto use_last; |
691 | ||
692 | /* Use the rules from the TZ string to compute the change. */ | |
693 | __tz_compute (timer, tp, 1); | |
694 | ||
c6d381d3 UD |
695 | /* If tzspec comes from posixrules loaded by __tzfile_default, |
696 | override the STD and DST zone names with the ones user | |
697 | requested in TZ envvar. */ | |
a1ffb40e | 698 | if (__glibc_unlikely (zone_names == (char *) &leaps[num_leaps])) |
c6d381d3 UD |
699 | { |
700 | assert (num_types == 2); | |
701 | __tzname[0] = __tzstring (zone_names); | |
702 | __tzname[1] = __tzstring (&zone_names[strlen (zone_names) + 1]); | |
703 | } | |
704 | ||
29143408 | 705 | goto leap; |
89dc9d4c | 706 | } |
fa76dde2 | 707 | else |
13252678 | 708 | { |
fa76dde2 UD |
709 | /* Find the first transition after TIMER, and |
710 | then pick the type of the transition before it. */ | |
711 | size_t lo = 0; | |
712 | size_t hi = num_transitions - 1; | |
713 | /* Assume that DST is changing twice a year and guess initial | |
714 | search spot from it. | |
715 | Half of a gregorian year has on average 365.2425 * 86400 / 2 | |
716 | = 15778476 seconds. */ | |
717 | i = (transitions[num_transitions - 1] - timer) / 15778476; | |
718 | if (i < num_transitions) | |
13252678 | 719 | { |
fa76dde2 UD |
720 | i = num_transitions - 1 - i; |
721 | if (timer < transitions[i]) | |
13252678 | 722 | { |
fa76dde2 UD |
723 | if (i < 10 || timer >= transitions[i - 10]) |
724 | { | |
725 | /* Linear search. */ | |
726 | while (timer < transitions[i - 1]) | |
727 | --i; | |
728 | goto found; | |
729 | } | |
730 | hi = i - 10; | |
13252678 | 731 | } |
fa76dde2 | 732 | else |
13252678 | 733 | { |
fa76dde2 UD |
734 | if (i + 10 >= num_transitions || timer < transitions[i + 10]) |
735 | { | |
736 | /* Linear search. */ | |
737 | while (timer >= transitions[i]) | |
738 | ++i; | |
739 | goto found; | |
740 | } | |
741 | lo = i + 10; | |
13252678 | 742 | } |
13252678 | 743 | } |
13252678 | 744 | |
fa76dde2 UD |
745 | /* Binary search. */ |
746 | /* assert (timer >= transitions[lo] && timer < transitions[hi]); */ | |
747 | while (lo + 1 < hi) | |
748 | { | |
749 | i = (lo + hi) / 2; | |
750 | if (timer < transitions[i]) | |
751 | hi = i; | |
752 | else | |
753 | lo = i; | |
754 | } | |
755 | i = hi; | |
89dc9d4c | 756 | |
fa76dde2 | 757 | found: |
e2cceb5a UD |
758 | /* assert (timer >= transitions[i - 1] |
759 | && (i == num_transitions || timer < transitions[i])); */ | |
fa76dde2 UD |
760 | __tzname[types[type_idxs[i - 1]].isdst] |
761 | = __tzstring (&zone_names[types[type_idxs[i - 1]].idx]); | |
762 | size_t j = i; | |
763 | while (j < num_transitions) | |
89dc9d4c | 764 | { |
fa76dde2 UD |
765 | int type = type_idxs[j]; |
766 | int dst = types[type].isdst; | |
767 | int idx = types[type].idx; | |
89dc9d4c | 768 | |
fa76dde2 UD |
769 | if (__tzname[dst] == NULL) |
770 | { | |
771 | __tzname[dst] = __tzstring (&zone_names[idx]); | |
89dc9d4c | 772 | |
fa76dde2 UD |
773 | if (__tzname[1 - dst] != NULL) |
774 | break; | |
775 | } | |
89dc9d4c | 776 | |
fa76dde2 UD |
777 | ++j; |
778 | } | |
28f540f4 | 779 | |
a1ffb40e | 780 | if (__glibc_unlikely (__tzname[0] == NULL)) |
c6d381d3 UD |
781 | __tzname[0] = __tzname[1]; |
782 | ||
fa76dde2 UD |
783 | i = type_idxs[i - 1]; |
784 | } | |
860d3729 | 785 | |
fa76dde2 | 786 | struct ttinfo *info = &types[i]; |
ff152e3f UD |
787 | __daylight = rule_stdoff != rule_dstoff; |
788 | __timezone = -rule_stdoff; | |
a3e0e9ae | 789 | |
a3e0e9ae UD |
790 | if (__tzname[0] == NULL) |
791 | { | |
792 | /* This should only happen if there are no transition rules. | |
793 | In this case there should be only one single type. */ | |
794 | assert (num_types == 1); | |
795 | __tzname[0] = __tzstring (zone_names); | |
796 | } | |
ff152e3f UD |
797 | if (__tzname[1] == NULL) |
798 | /* There is no daylight saving time. */ | |
799 | __tzname[1] = __tzname[0]; | |
a709dd43 | 800 | tp->tm_isdst = info->isdst; |
89dc9d4c UD |
801 | assert (strcmp (&zone_names[info->idx], __tzname[tp->tm_isdst]) == 0); |
802 | tp->tm_zone = __tzname[tp->tm_isdst]; | |
a709dd43 | 803 | tp->tm_gmtoff = info->offset; |
9a0a462c | 804 | } |
28f540f4 | 805 | |
29143408 | 806 | leap: |
28f540f4 RM |
807 | *leap_correct = 0L; |
808 | *leap_hit = 0; | |
809 | ||
810 | /* Find the last leap second correction transition time before TIMER. */ | |
811 | i = num_leaps; | |
812 | do | |
813 | if (i-- == 0) | |
38e68573 | 814 | return; |
28f540f4 RM |
815 | while (timer < leaps[i].transition); |
816 | ||
817 | /* Apply its correction. */ | |
818 | *leap_correct = leaps[i].change; | |
819 | ||
820 | if (timer == leaps[i].transition && /* Exactly at the transition time. */ | |
821 | ((i == 0 && leaps[i].change > 0) || | |
822 | leaps[i].change > leaps[i - 1].change)) | |
823 | { | |
824 | *leap_hit = 1; | |
ba9234d9 UD |
825 | while (i > 0 |
826 | && leaps[i].transition == leaps[i - 1].transition + 1 | |
827 | && leaps[i].change == leaps[i - 1].change + 1) | |
28f540f4 RM |
828 | { |
829 | ++*leap_hit; | |
830 | --i; | |
831 | } | |
832 | } | |
28f540f4 RM |
833 | } |
834 | \f | |
9a0a462c | 835 | static void |
dfd2257a | 836 | internal_function |
860d3729 | 837 | compute_tzname_max (size_t chars) |
28f540f4 | 838 | { |
28f540f4 RM |
839 | const char *p; |
840 | ||
841 | p = zone_names; | |
842 | do | |
843 | { | |
844 | const char *start = p; | |
845 | while (*p != '\0') | |
846 | ++p; | |
5290baf0 | 847 | if ((size_t) (p - start) > __tzname_cur_max) |
28f540f4 | 848 | __tzname_cur_max = p - start; |
ba9234d9 UD |
849 | } |
850 | while (++p < &zone_names[chars]); | |
28f540f4 | 851 | } |