]>
Commit | Line | Data |
---|---|---|
14ea22e9 | 1 | /* Copyright (C) 1991, 92, 93, 95, 96, 97, 98 Free Software Foundation, Inc. |
860d3729 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
860d3729 UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | 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 | |
12 | Library General Public License for more details. | |
28f540f4 | 13 | |
860d3729 UD |
14 | You should have received a copy of the GNU Library General Public |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 | 18 | |
a3e0e9ae UD |
19 | #include <assert.h> |
20 | #include <limits.h> | |
28f540f4 | 21 | #include <stdio.h> |
a3e0e9ae | 22 | #include <stdlib.h> |
28f540f4 | 23 | #include <string.h> |
a3e0e9ae | 24 | #include <time.h> |
9d187dd4 | 25 | #include <unistd.h> |
28f540f4 RM |
26 | |
27 | #define NOID | |
14ea22e9 | 28 | #include <timezone/tzfile.h> |
28f540f4 | 29 | |
28f540f4 RM |
30 | int __use_tzfile = 0; |
31 | ||
32 | struct ttinfo | |
33 | { | |
34 | long int offset; /* Seconds east of GMT. */ | |
35 | unsigned char isdst; /* Used to set tm_isdst. */ | |
36 | unsigned char idx; /* Index into `zone_names'. */ | |
98fa1d6e RM |
37 | unsigned char isstd; /* Transition times are in standard time. */ |
38 | unsigned char isgmt; /* Transition times are in GMT. */ | |
28f540f4 RM |
39 | }; |
40 | ||
41 | struct leap | |
42 | { | |
43 | time_t transition; /* Time the transition takes effect. */ | |
44 | long int change; /* Seconds of correction to apply. */ | |
45 | }; | |
46 | ||
0413b54c | 47 | extern char * __tzstring (const char *); /* Defined in tzset.c. */ |
cd6ede75 | 48 | |
dfd2257a UD |
49 | static struct ttinfo *find_transition (time_t timer) internal_function; |
50 | static void compute_tzname_max (size_t) internal_function; | |
28f540f4 RM |
51 | |
52 | static size_t num_transitions; | |
53 | static time_t *transitions = NULL; | |
54 | static unsigned char *type_idxs = NULL; | |
55 | static size_t num_types; | |
56 | static struct ttinfo *types = NULL; | |
57 | static char *zone_names = NULL; | |
ff152e3f UD |
58 | static long int rule_stdoff; |
59 | static long int rule_dstoff; | |
28f540f4 RM |
60 | static size_t num_leaps; |
61 | static struct leap *leaps = NULL; | |
62 | ||
a2cafe30 | 63 | #include <endian.h> |
ba9234d9 | 64 | #include <byteswap.h> |
a2cafe30 RM |
65 | |
66 | /* Decode the four bytes at PTR as a signed integer in network byte order. */ | |
67 | static inline int | |
68 | decode (const void *ptr) | |
69 | { | |
b20e47cb RM |
70 | if ((BYTE_ORDER == BIG_ENDIAN) && sizeof (int) == 4) |
71 | return *(const int *) ptr; | |
ba9234d9 UD |
72 | else if (BYTE_ORDER == LITTLE_ENDIAN && sizeof (int) == 4) |
73 | return bswap_32 (*(const int *) ptr); | |
b20e47cb RM |
74 | else |
75 | { | |
76 | const unsigned char *p = ptr; | |
77 | int result = *p & (1 << (CHAR_BIT - 1)) ? ~0 : 0; | |
78 | ||
79 | result = (result << 8) | *p++; | |
80 | result = (result << 8) | *p++; | |
81 | result = (result << 8) | *p++; | |
82 | result = (result << 8) | *p++; | |
83 | ||
84 | return result; | |
85 | } | |
a2cafe30 | 86 | } |
28f540f4 RM |
87 | |
88 | void | |
860d3729 | 89 | __tzfile_read (const char *file) |
28f540f4 | 90 | { |
9d187dd4 | 91 | static const char default_tzdir[] = TZDIR; |
98fa1d6e | 92 | size_t num_isstd, num_isgmt; |
28f540f4 RM |
93 | register FILE *f; |
94 | struct tzhead tzhead; | |
95 | size_t chars; | |
96 | register size_t i; | |
97 | ||
98 | __use_tzfile = 0; | |
99 | ||
100 | if (transitions != NULL) | |
860d3729 | 101 | free ((void *) transitions); |
28f540f4 RM |
102 | transitions = NULL; |
103 | if (type_idxs != NULL) | |
860d3729 | 104 | free ((void *) type_idxs); |
28f540f4 RM |
105 | type_idxs = NULL; |
106 | if (types != NULL) | |
860d3729 | 107 | free ((void *) types); |
28f540f4 RM |
108 | types = NULL; |
109 | if (zone_names != NULL) | |
860d3729 | 110 | free ((void *) zone_names); |
28f540f4 RM |
111 | zone_names = NULL; |
112 | if (leaps != NULL) | |
860d3729 | 113 | free ((void *) leaps); |
28f540f4 RM |
114 | leaps = NULL; |
115 | ||
a3b58440 RM |
116 | if (file == NULL) |
117 | /* No user specification; use the site-wide default. */ | |
28f540f4 | 118 | file = TZDEFAULT; |
a3b58440 | 119 | else if (*file == '\0') |
9a0a462c UD |
120 | /* User specified the empty string; use UTC with no leap seconds. */ |
121 | return; | |
1228ed5c UD |
122 | else |
123 | { | |
124 | /* We must not allow to read an arbitrary file in a setuid | |
125 | program. So we fail for any file which is not in the | |
7434ccad UD |
126 | directory hierachy starting at TZDIR |
127 | and which is not the system wide default TZDEFAULT. */ | |
1228ed5c UD |
128 | if (__libc_enable_secure |
129 | && ((*file == '/' | |
4cca6b86 | 130 | && memcmp (file, TZDEFAULT, sizeof TZDEFAULT) |
1228ed5c UD |
131 | && memcmp (file, default_tzdir, sizeof (default_tzdir) - 1)) |
132 | || strstr (file, "../") != NULL)) | |
7434ccad UD |
133 | /* This test is certainly a bit too restrictive but it should |
134 | catch all critical cases. */ | |
1228ed5c UD |
135 | return; |
136 | } | |
9d187dd4 | 137 | |
28f540f4 RM |
138 | if (*file != '/') |
139 | { | |
5290baf0 UD |
140 | const char *tzdir; |
141 | unsigned int len, tzdir_len; | |
86187531 | 142 | char *new, *tmp; |
5290baf0 UD |
143 | |
144 | tzdir = __secure_getenv ("TZDIR"); | |
145 | if (tzdir == NULL || *tzdir == '\0') | |
146 | { | |
147 | tzdir = default_tzdir; | |
148 | tzdir_len = sizeof (default_tzdir) - 1; | |
149 | } | |
150 | else | |
151 | tzdir_len = strlen (tzdir); | |
152 | len = strlen (file) + 1; | |
153 | new = (char *) __alloca (tzdir_len + 1 + len); | |
86187531 UD |
154 | tmp = __mempcpy (new, tzdir, tzdir_len); |
155 | *tmp++ = '/'; | |
156 | __mempcpy (tmp, file, len); | |
28f540f4 RM |
157 | file = new; |
158 | } | |
159 | ||
5290baf0 | 160 | f = fopen (file, "r"); |
28f540f4 RM |
161 | if (f == NULL) |
162 | return; | |
163 | ||
ba9234d9 | 164 | if (fread_unlocked ((void *) &tzhead, sizeof (tzhead), 1, f) != 1) |
28f540f4 RM |
165 | goto lose; |
166 | ||
a2cafe30 RM |
167 | num_transitions = (size_t) decode (tzhead.tzh_timecnt); |
168 | num_types = (size_t) decode (tzhead.tzh_typecnt); | |
169 | chars = (size_t) decode (tzhead.tzh_charcnt); | |
170 | num_leaps = (size_t) decode (tzhead.tzh_leapcnt); | |
171 | num_isstd = (size_t) decode (tzhead.tzh_ttisstdcnt); | |
172 | num_isgmt = (size_t) decode (tzhead.tzh_ttisgmtcnt); | |
28f540f4 RM |
173 | |
174 | if (num_transitions > 0) | |
175 | { | |
a3e0e9ae | 176 | transitions = (time_t *) malloc (num_transitions * sizeof (time_t)); |
28f540f4 RM |
177 | if (transitions == NULL) |
178 | goto lose; | |
179 | type_idxs = (unsigned char *) malloc (num_transitions); | |
180 | if (type_idxs == NULL) | |
181 | goto lose; | |
182 | } | |
183 | if (num_types > 0) | |
184 | { | |
185 | types = (struct ttinfo *) malloc (num_types * sizeof (struct ttinfo)); | |
186 | if (types == NULL) | |
187 | goto lose; | |
188 | } | |
189 | if (chars > 0) | |
190 | { | |
191 | zone_names = (char *) malloc (chars); | |
192 | if (zone_names == NULL) | |
193 | goto lose; | |
194 | } | |
195 | if (num_leaps > 0) | |
196 | { | |
197 | leaps = (struct leap *) malloc (num_leaps * sizeof (struct leap)); | |
198 | if (leaps == NULL) | |
199 | goto lose; | |
200 | } | |
201 | ||
b20e47cb RM |
202 | if (sizeof (time_t) < 4) |
203 | abort (); | |
204 | ||
ba9234d9 UD |
205 | if (fread_unlocked (transitions, 4, num_transitions, f) != num_transitions |
206 | || fread_unlocked (type_idxs, 1, num_transitions, f) != num_transitions) | |
28f540f4 RM |
207 | goto lose; |
208 | ||
5290baf0 UD |
209 | /* Check for bogus indices in the data file, so we can hereafter |
210 | safely use type_idxs[T] as indices into `types' and never crash. */ | |
211 | for (i = 0; i < num_transitions; ++i) | |
212 | if (type_idxs[i] >= num_types) | |
213 | goto lose; | |
214 | ||
a2cafe30 RM |
215 | if (BYTE_ORDER != BIG_ENDIAN || sizeof (time_t) != 4) |
216 | { | |
217 | /* Decode the transition times, stored as 4-byte integers in | |
218 | network (big-endian) byte order. We work from the end of | |
219 | the array so as not to clobber the next element to be | |
220 | processed when sizeof (time_t) > 4. */ | |
221 | i = num_transitions; | |
b20e47cb | 222 | while (i-- > 0) |
a3e0e9ae | 223 | transitions[i] = decode ((char *) transitions + i * 4); |
a2cafe30 | 224 | } |
28f540f4 RM |
225 | |
226 | for (i = 0; i < num_types; ++i) | |
227 | { | |
228 | unsigned char x[4]; | |
ba9234d9 UD |
229 | if (fread_unlocked (x, 1, 4, f) != 4 |
230 | || fread_unlocked (&types[i].isdst, 1, 1, f) != 1 | |
231 | || fread_unlocked (&types[i].idx, 1, 1, f) != 1) | |
28f540f4 | 232 | goto lose; |
8b7fb588 UD |
233 | if (types[i].isdst > 1) |
234 | goto lose; | |
5290baf0 UD |
235 | if (types[i].idx >= chars) /* Bogus index in data file. */ |
236 | goto lose; | |
a2cafe30 | 237 | types[i].offset = (long int) decode (x); |
28f540f4 RM |
238 | } |
239 | ||
ba9234d9 | 240 | if (fread_unlocked (zone_names, 1, chars, f) != chars) |
28f540f4 RM |
241 | goto lose; |
242 | ||
243 | for (i = 0; i < num_leaps; ++i) | |
244 | { | |
245 | unsigned char x[4]; | |
ba9234d9 | 246 | if (fread_unlocked (x, 1, sizeof (x), f) != sizeof (x)) |
28f540f4 | 247 | goto lose; |
a2cafe30 | 248 | leaps[i].transition = (time_t) decode (x); |
ba9234d9 | 249 | if (fread_unlocked (x, 1, sizeof (x), f) != sizeof (x)) |
28f540f4 | 250 | goto lose; |
a2cafe30 | 251 | leaps[i].change = (long int) decode (x); |
28f540f4 RM |
252 | } |
253 | ||
254 | for (i = 0; i < num_isstd; ++i) | |
255 | { | |
ba9234d9 | 256 | int c = getc_unlocked (f); |
28f540f4 RM |
257 | if (c == EOF) |
258 | goto lose; | |
259 | types[i].isstd = c != 0; | |
260 | } | |
261 | while (i < num_types) | |
262 | types[i++].isstd = 0; | |
263 | ||
98fa1d6e RM |
264 | for (i = 0; i < num_isgmt; ++i) |
265 | { | |
ba9234d9 | 266 | int c = getc_unlocked (f); |
98fa1d6e RM |
267 | if (c == EOF) |
268 | goto lose; | |
269 | types[i].isgmt = c != 0; | |
270 | } | |
271 | while (i < num_types) | |
272 | types[i++].isgmt = 0; | |
273 | ||
860d3729 UD |
274 | fclose (f); |
275 | ||
a3e0e9ae UD |
276 | /* First "register" all timezone names. */ |
277 | for (i = 0; i < num_types; ++i) | |
278 | (void) __tzstring (&zone_names[types[i].idx]); | |
279 | ||
ff152e3f UD |
280 | /* Find the standard and daylight time offsets used by the rule file. |
281 | We choose the offsets in the types of each flavor that are | |
282 | transitioned to earliest in time. */ | |
a3e0e9ae | 283 | __tzname[0] = NULL; |
ff152e3f | 284 | __tzname[1] = NULL; |
a3e0e9ae UD |
285 | for (i = num_transitions; i > 0; ) |
286 | { | |
287 | int type = type_idxs[--i]; | |
288 | int dst = types[type].isdst; | |
289 | int idx = types[type].idx; | |
290 | ||
291 | if (__tzname[dst] == NULL) | |
292 | { | |
293 | __tzname[dst] = __tzstring (&zone_names[idx]); | |
294 | ||
295 | if (__tzname[1 - dst] != NULL) | |
296 | break; | |
297 | } | |
298 | } | |
299 | if (__tzname[0] == NULL) | |
300 | { | |
301 | /* This should only happen if there are no transition rules. | |
302 | In this case there should be only one single type. */ | |
303 | assert (num_types == 1); | |
304 | __tzname[0] = __tzstring (zone_names); | |
305 | } | |
ff152e3f UD |
306 | if (__tzname[1] == NULL) |
307 | __tzname[1] = __tzname[0]; | |
28f540f4 RM |
308 | |
309 | compute_tzname_max (chars); | |
a3b58440 | 310 | |
90865aa8 UD |
311 | if (num_transitions == 0) |
312 | /* Use the first rule (which should also be the only one. */ | |
313 | rule_stdoff = rule_dstoff = types[0].offset; | |
314 | else | |
ff152e3f | 315 | { |
90865aa8 UD |
316 | rule_stdoff = rule_dstoff = 0; |
317 | for (i = 0; i < num_transitions; ++i) | |
318 | { | |
319 | if (!rule_stdoff && !types[type_idxs[i]].isdst) | |
320 | rule_stdoff = types[type_idxs[i]].offset; | |
321 | if (!rule_dstoff && types[type_idxs[i]].isdst) | |
322 | rule_dstoff = types[type_idxs[i]].offset; | |
323 | if (rule_stdoff && rule_dstoff) | |
324 | break; | |
325 | } | |
ff152e3f UD |
326 | } |
327 | ||
328 | __daylight = rule_stdoff != rule_dstoff; | |
329 | __timezone = -rule_stdoff; | |
330 | ||
28f540f4 RM |
331 | __use_tzfile = 1; |
332 | return; | |
333 | ||
ba9234d9 UD |
334 | lose: |
335 | fclose (f); | |
28f540f4 RM |
336 | } |
337 | \f | |
98fa1d6e RM |
338 | /* The user specified a hand-made timezone, but not its DST rules. |
339 | We will use the names and offsets from the user, and the rules | |
340 | from the TZDEFRULES file. */ | |
341 | ||
28f540f4 | 342 | void |
cd6ede75 UD |
343 | __tzfile_default (const char *std, const char *dst, |
344 | long int stdoff, long int dstoff) | |
28f540f4 RM |
345 | { |
346 | size_t stdlen, dstlen, i; | |
98fa1d6e | 347 | int isdst; |
28f540f4 RM |
348 | |
349 | __tzfile_read (TZDEFRULES); | |
350 | if (!__use_tzfile) | |
351 | return; | |
352 | ||
353 | if (num_types < 2) | |
354 | { | |
355 | __use_tzfile = 0; | |
356 | return; | |
357 | } | |
358 | ||
98fa1d6e | 359 | /* Ignore the zone names read from the file. */ |
28f540f4 RM |
360 | free (zone_names); |
361 | ||
98fa1d6e | 362 | /* Use the names the user specified. */ |
28f540f4 RM |
363 | stdlen = strlen (std) + 1; |
364 | dstlen = strlen (dst) + 1; | |
365 | zone_names = malloc (stdlen + dstlen); | |
366 | if (zone_names == NULL) | |
367 | { | |
368 | __use_tzfile = 0; | |
369 | return; | |
370 | } | |
86187531 | 371 | __mempcpy (__mempcpy (zone_names, std, stdlen), dst, dstlen); |
28f540f4 | 372 | |
88455219 UD |
373 | /* Now there are only two zones, regardless of what the file contained. */ |
374 | num_types = 2; | |
375 | ||
98fa1d6e RM |
376 | /* Now correct the transition times for the user-specified standard and |
377 | daylight offsets from GMT. */ | |
378 | isdst = 0; | |
98fa1d6e RM |
379 | for (i = 0; i < num_transitions; ++i) |
380 | { | |
381 | struct ttinfo *trans_type = &types[type_idxs[i]]; | |
382 | ||
383 | /* We will use only types 0 (standard) and 1 (daylight). | |
384 | Fix up this transition to point to whichever matches | |
385 | the flavor of its original type. */ | |
386 | type_idxs[i] = trans_type->isdst; | |
387 | ||
388 | if (trans_type->isgmt) | |
389 | /* The transition time is in GMT. No correction to apply. */ ; | |
390 | else if (isdst && !trans_type->isstd) | |
391 | /* The type says this transition is in "local wall clock time", and | |
392 | wall clock time as of the previous transition was DST. Correct | |
393 | for the difference between the rule's DST offset and the user's | |
394 | DST offset. */ | |
395 | transitions[i] += dstoff - rule_dstoff; | |
396 | else | |
397 | /* This transition is in "local wall clock time", and wall clock | |
398 | time as of this iteration is non-DST. Correct for the | |
399 | difference between the rule's standard offset and the user's | |
400 | standard offset. */ | |
401 | transitions[i] += stdoff - rule_stdoff; | |
402 | ||
403 | /* The DST state of "local wall clock time" for the next iteration is | |
404 | as specified by this transition. */ | |
405 | isdst = trans_type->isdst; | |
406 | } | |
407 | ||
408 | /* Reset types 0 and 1 to describe the user's settings. */ | |
409 | types[0].idx = 0; | |
410 | types[0].offset = stdoff; | |
411 | types[0].isdst = 0; | |
412 | types[1].idx = stdlen; | |
413 | types[1].offset = dstoff; | |
414 | types[1].isdst = 1; | |
28f540f4 | 415 | |
5290baf0 | 416 | /* Reset the zone names to point to the user's names. */ |
cd6ede75 UD |
417 | __tzname[0] = (char *) std; |
418 | __tzname[1] = (char *) dst; | |
5290baf0 | 419 | |
90865aa8 UD |
420 | /* Set the timezone. */ |
421 | __timezone = -types[0].offset; | |
422 | ||
28f540f4 RM |
423 | compute_tzname_max (stdlen + dstlen); |
424 | } | |
425 | \f | |
860d3729 | 426 | static struct ttinfo * |
dfd2257a | 427 | internal_function |
860d3729 | 428 | find_transition (time_t timer) |
28f540f4 | 429 | { |
860d3729 | 430 | size_t i; |
28f540f4 RM |
431 | |
432 | if (num_transitions == 0 || timer < transitions[0]) | |
433 | { | |
434 | /* TIMER is before any transition (or there are no transitions). | |
435 | Choose the first non-DST type | |
436 | (or the first if they're all DST types). */ | |
437 | i = 0; | |
438 | while (i < num_types && types[i].isdst) | |
439 | ++i; | |
440 | if (i == num_types) | |
441 | i = 0; | |
442 | } | |
443 | else | |
444 | { | |
445 | /* Find the first transition after TIMER, and | |
446 | then pick the type of the transition before it. */ | |
447 | for (i = 1; i < num_transitions; ++i) | |
448 | if (timer < transitions[i]) | |
449 | break; | |
450 | i = type_idxs[i - 1]; | |
451 | } | |
452 | ||
860d3729 UD |
453 | return &types[i]; |
454 | } | |
455 | \f | |
456 | int | |
9a0a462c | 457 | __tzfile_compute (time_t timer, int use_localtime, |
b17277cf | 458 | long int *leap_correct, int *leap_hit, |
a709dd43 | 459 | struct tm *tp) |
860d3729 | 460 | { |
860d3729 UD |
461 | register size_t i; |
462 | ||
9a0a462c UD |
463 | if (use_localtime) |
464 | { | |
a709dd43 | 465 | struct ttinfo *info = find_transition (timer); |
ff152e3f UD |
466 | __daylight = rule_stdoff != rule_dstoff; |
467 | __timezone = -rule_stdoff; | |
a3e0e9ae | 468 | __tzname[0] = NULL; |
ff152e3f | 469 | __tzname[1] = NULL; |
a3e0e9ae UD |
470 | for (i = num_transitions; i > 0; ) |
471 | { | |
472 | int type = type_idxs[--i]; | |
473 | int dst = types[type].isdst; | |
474 | int idx = types[type].idx; | |
475 | ||
476 | if (__tzname[dst] == NULL) | |
477 | { | |
478 | __tzname[dst] = __tzstring (&zone_names[idx]); | |
479 | ||
480 | if (__tzname[1 - dst] != NULL) | |
481 | break; | |
482 | } | |
483 | } | |
484 | if (__tzname[0] == NULL) | |
485 | { | |
486 | /* This should only happen if there are no transition rules. | |
487 | In this case there should be only one single type. */ | |
488 | assert (num_types == 1); | |
489 | __tzname[0] = __tzstring (zone_names); | |
490 | } | |
ff152e3f UD |
491 | if (__tzname[1] == NULL) |
492 | /* There is no daylight saving time. */ | |
493 | __tzname[1] = __tzname[0]; | |
a709dd43 UD |
494 | tp->tm_isdst = info->isdst; |
495 | tp->tm_zone = &zone_names[info->idx]; | |
496 | tp->tm_gmtoff = info->offset; | |
9a0a462c | 497 | } |
28f540f4 RM |
498 | |
499 | *leap_correct = 0L; | |
500 | *leap_hit = 0; | |
501 | ||
502 | /* Find the last leap second correction transition time before TIMER. */ | |
503 | i = num_leaps; | |
504 | do | |
505 | if (i-- == 0) | |
506 | return 1; | |
507 | while (timer < leaps[i].transition); | |
508 | ||
509 | /* Apply its correction. */ | |
510 | *leap_correct = leaps[i].change; | |
511 | ||
512 | if (timer == leaps[i].transition && /* Exactly at the transition time. */ | |
513 | ((i == 0 && leaps[i].change > 0) || | |
514 | leaps[i].change > leaps[i - 1].change)) | |
515 | { | |
516 | *leap_hit = 1; | |
ba9234d9 UD |
517 | while (i > 0 |
518 | && leaps[i].transition == leaps[i - 1].transition + 1 | |
519 | && leaps[i].change == leaps[i - 1].change + 1) | |
28f540f4 RM |
520 | { |
521 | ++*leap_hit; | |
522 | --i; | |
523 | } | |
524 | } | |
525 | ||
526 | return 1; | |
527 | } | |
528 | \f | |
9a0a462c | 529 | static void |
dfd2257a | 530 | internal_function |
860d3729 | 531 | compute_tzname_max (size_t chars) |
28f540f4 | 532 | { |
cd6ede75 | 533 | extern size_t __tzname_cur_max; /* Defined in tzset.c. */ |
28f540f4 RM |
534 | |
535 | const char *p; | |
536 | ||
537 | p = zone_names; | |
538 | do | |
539 | { | |
540 | const char *start = p; | |
541 | while (*p != '\0') | |
542 | ++p; | |
5290baf0 | 543 | if ((size_t) (p - start) > __tzname_cur_max) |
28f540f4 | 544 | __tzname_cur_max = p - start; |
ba9234d9 UD |
545 | } |
546 | while (++p < &zone_names[chars]); | |
28f540f4 | 547 | } |