source: Main/trunk/Server/strptime.c@ 381

Last change on this file since 381 was 381, checked in by Nishi, on Oct 17, 2024 at 7:25:06 PM

fix strptime
  • Property svn:keywords set to Id
File size: 25.7 KB
Line 
1/* $NetBSD: strptime.c,v 1.62 2017/08/24 01:01:09 ginsbach Exp $ */
2/* http://cvsweb.netbsd.org/bsdweb.cgi/~checkout~/src/lib/libc/time/strptime.c?only_with_tag=HEAD
3 * NetBSD implementation strptime().
4 * Format description: https://netbsd.gw.com/cgi-bin/man-cgi?strptime+3+NetBSD-current
5*/
6/*-
7 * Copyright (c) 1997, 1998, 2005, 2008 The NetBSD Foundation, Inc.
8 * All rights reserved.
9 *
10 * This code was contributed to The NetBSD Foundation by Klaus Klein.
11 * Heavily optimised by David Laight
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34
35//#include <sys/cdefs.h>
36//__RCSID("$NetBSD: strptime.c,v 1.62 2017/08/24 01:01:09 ginsbach Exp $");
37
38#if defined(__MINGW32__) || defined(_MSC_VER) || defined(__BORLANDC__) || defined(__WATCOMC__) || defined(__NeXT__) || defined(__bsdi__)
39
40#include <stdlib.h>
41#include <ctype.h>
42#include <string.h>
43#include <time.h>
44#include <stdint.h>
45
46#ifdef __WATCOMC__
47#ifndef __NETWARE__
48#include <strings.h>
49#endif
50#endif
51
52static const unsigned char *conv_num(const unsigned char *, int *, unsigned int, unsigned int);
53static const unsigned char *find_string(const unsigned char *, int *, const char * const *, const char * const *, int);
54
55/*
56 * We do not implement alternate representations. However, we always
57 * check whether a given modifier is allowed for a certain conversion.
58 */
59#define ALT_E 0x01
60#define ALT_O 0x02
61#define LEGAL_ALT(x) { if (alt_format & ~(x)) return NULL; }
62
63#define TM_YEAR_BASE 1900
64
65#define TM_SUNDAY 0
66#define TM_MONDAY 1
67#define TM_TUESDAY 2
68#define TM_WEDNESDAY 3
69#define TM_THURSDAY 4
70#define TM_FRIDAY 5
71#define TM_SATURDAY 6
72
73#define S_YEAR (1 << 0)
74#define S_MON (1 << 1)
75#define S_YDAY (1 << 2)
76#define S_MDAY (1 << 3)
77#define S_WDAY (1 << 4)
78#define S_HOUR (1 << 5)
79
80#define HAVE_MDAY(s) (s & S_MDAY)
81#define HAVE_MON(s) (s & S_MON)
82#define HAVE_WDAY(s) (s & S_WDAY)
83#define HAVE_YDAY(s) (s & S_YDAY)
84#define HAVE_YEAR(s) (s & S_YEAR)
85#define HAVE_HOUR(s) (s & S_HOUR)
86
87#define SECSPERMIN 60
88#define MINSPERHOUR 60
89#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
90#define HOURSPERDAY 24
91
92#define HERE_D_T_FMT "%a %b %e %H:%M:%S %Y"
93#define HERE_D_FMT "%y/%m/%d"
94#define HERE_T_FMT_AMPM "%I:%M:%S %p"
95#define HERE_T_FMT "%H:%M:%S"
96
97#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
98
99/*
100** Since everything in isleap is modulo 400 (or a factor of 400), we know that
101** isleap(y) == isleap(y % 400)
102** and so
103** isleap(a + b) == isleap((a + b) % 400)
104** or
105** isleap(a + b) == isleap(a % 400 + b % 400)
106** This is true even if % means modulo rather than Fortran remainder
107** (which is allowed by C89 but not by C99 or later).
108** We use this to avoid addition overflow problems.
109*/
110
111#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
112
113#if defined(_MSC_VER) || defined(__BORLANDC__)
114#define tzname _tzname
115#define strncasecmp _strnicmp
116#endif
117
118#ifdef __WATCOMC__
119#define _tzset tzset
120#endif
121
122#if defined(__BORLANDC__) || defined(__NETWARE__)
123char* cm_strdup(const char* str);
124
125#ifdef __NETWARE__
126#define strncasecmp _strnicmp
127#endif
128
129int _strnicmp(const char* _a, const char* _b, int len){
130 char* a = cm_strdup(_a);
131 char* b = cm_strdup(_b);
132 int i;
133 int r;
134 for(i = 0; a[i] != 0; i++){
135 a[i] = tolower(a[i]);
136 }
137 for(i = 0; b[i] != 0; i++){
138 b[i] = tolower(b[i]);
139 }
140 r = strncmp(a, b, len);
141 free(a);
142 free(b);
143 return r;
144}
145#endif
146
147#ifdef TM_ZONE
148static char* utc = "UTC";
149#endif
150/* RFC-822/RFC-2822 */
151static const char* const nast[] = {
152 "EST", "CST", "MST", "PST", "\0\0\0"
153};
154static const char* const nadt[] = {
155 "EDT", "CDT", "MDT", "PDT", "\0\0\0"
156};
157static const char* weekday_name[] =
158{
159 "Sunday", "Monday", "Tuesday", "Wednesday",
160 "Thursday", "Friday", "Saturday"
161};
162static const char* ab_weekday_name[] =
163{
164 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
165};
166static const char* month_name[] =
167{
168 "January", "February", "March", "April", "May", "June",
169 "July", "August", "September", "October", "November", "December"
170};
171static const char* ab_month_name[] =
172{
173 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
174 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
175};
176static const char* am_pm[] = {"AM", "PM"};
177
178
179/*
180 * Table to determine the ordinal date for the start of a month.
181 * Ref: http://en.wikipedia.org/wiki/ISO_week_date
182 */
183static const int start_of_month[2][13] = {
184 /* non-leap year */
185 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
186 /* leap year */
187 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
188};
189
190/*
191 * Calculate the week day of the first day of a year. Valid for
192 * the Gregorian calendar, which began Sept 14, 1752 in the UK
193 * and its colonies. Ref:
194 * http://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week
195 */
196
197static int
198first_wday_of(int yr)
199{
200 return ((2 * (3 - (yr / 100) % 4)) + (yr % 100) + ((yr % 100) / 4) +
201 (isleap(yr) ? 6 : 0) + 1) % 7;
202}
203
204#define delim(p) ((p) == '\0' || isspace((unsigned char)(p)))
205
206static int
207fromzone(const unsigned char **bp, struct tm *tm, int mandatory)
208{
209// timezone_t tz;
210 char buf[512], *p;
211 const unsigned char *rp;
212
213 for (p = buf, rp = *bp; !delim(*rp) && p < &buf[sizeof(buf) - 1]; rp++)
214 *p++ = *rp;
215 *p = '\0';
216
217 if (mandatory)
218 *bp = rp;
219 if (!isalnum((unsigned char)*buf))
220 return 0;
221// tz = tzalloc(buf);
222// if (tz == NULL)
223// return 0;
224
225 *bp = rp;
226 tm->tm_isdst = 0; /* XXX */
227#ifdef TM_GMTOFF
228 tm->TM_GMTOFF = tzgetgmtoff(tz, tm->tm_isdst);
229#endif
230#ifdef TM_ZONE
231 // Can't use tzgetname() here because we are going to free()
232 tm->TM_ZONE = NULL; /* XXX */
233#endif
234// tzfree(tz);
235 return 1;
236}
237
238char* strptime(const char *buf, const char *fmt, struct tm *tm)
239{
240 unsigned char c;
241 const unsigned char *bp, *ep, *zname;
242 int alt_format, i, split_year = 0, neg = 0, state = 0,
243 day_offset = -1, week_offset = 0, offs, mandatory;
244 const char *new_fmt;
245
246 bp = (const unsigned char *)buf;
247
248 while (bp != NULL && (c = *fmt++) != '\0') {
249 /* Clear `alternate' modifier prior to new conversion. */
250 alt_format = 0;
251 i = 0;
252
253 /* Eat up white-space. */
254 if (isspace(c)) {
255 while (isspace(*bp))
256 bp++;
257 continue;
258 }
259
260 if (c != '%')
261 goto literal;
262
263
264again: switch (c = *fmt++) {
265 case '%': /* "%%" is converted to "%". */
266literal:
267 if (c != *bp++)
268 return NULL;
269 LEGAL_ALT(0);
270 continue;
271
272 /*
273 * "Alternative" modifiers. Just set the appropriate flag
274 * and start over again.
275 */
276 case 'E': /* "%E?" alternative conversion modifier. */
277 LEGAL_ALT(0);
278 alt_format |= ALT_E;
279 goto again;
280
281 case 'O': /* "%O?" alternative conversion modifier. */
282 LEGAL_ALT(0);
283 alt_format |= ALT_O;
284 goto again;
285
286 /*
287 * "Complex" conversion rules, implemented through recursion.
288 */
289 case 'c': /* Date and time, using the locale's format. */
290// new_fmt = _TIME_LOCALE(loc)->d_t_fmt;
291 new_fmt = HERE_D_T_FMT;
292 state |= S_WDAY | S_MON | S_MDAY | S_YEAR;
293 goto recurse;
294
295 case 'F': /* The date as "%Y-%m-%d". */
296 new_fmt = "%Y-%m-%d";
297 LEGAL_ALT(0);
298 state |= S_MON | S_MDAY | S_YEAR;
299 goto recurse;
300
301 case 'R': /* The time as "%H:%M". */
302 new_fmt = "%H:%M";
303 LEGAL_ALT(0);
304 goto recurse;
305
306 case 'r': /* The time in 12-hour clock representation. */
307// new_fmt = _TIME_LOCALE(loc)->t_fmt_ampm;
308 new_fmt = HERE_T_FMT_AMPM;
309 LEGAL_ALT(0);
310 goto recurse;
311
312 case 'X': /* The time, using the locale's format. */
313 /* fall through */
314
315 case 'T': /* The time as "%H:%M:%S". */
316 new_fmt = HERE_T_FMT;
317 LEGAL_ALT(0);
318
319recurse:
320 bp = (const unsigned char *)strptime((const char *)bp,
321 new_fmt, tm);
322 LEGAL_ALT(ALT_E);
323 continue;
324
325 case 'x': /* The date, using the locale's format. */
326 /* fall throug */
327
328 case 'D': /* The date as "%y/%m/%d". */
329 {
330 int year;
331 new_fmt = HERE_D_FMT;
332 LEGAL_ALT(0);
333 state |= S_MON | S_MDAY | S_YEAR;
334 year = split_year ? tm->tm_year : 0;
335
336 bp = (const unsigned char *)strptime((const char *)bp,
337 new_fmt, tm);
338 LEGAL_ALT(ALT_E);
339 tm->tm_year += year;
340 if (split_year && tm->tm_year % (2000 - TM_YEAR_BASE) <= 68)
341 tm->tm_year -= 2000 - TM_YEAR_BASE;
342 split_year = 1;
343 continue;
344 }
345 /*
346 * "Elementary" conversion rules.
347 */
348 case 'A': /* The day of week, using the locale's form. */
349 case 'a':
350 bp = find_string(bp, &tm->tm_wday, weekday_name, ab_weekday_name, 7);
351 LEGAL_ALT(0);
352 state |= S_WDAY;
353 continue;
354
355 case 'B': /* The month, using the locale's form. */
356 case 'b':
357 case 'h':
358 bp = find_string(bp, &tm->tm_mon, month_name, ab_month_name, 12);
359 LEGAL_ALT(0);
360 state |= S_MON;
361 continue;
362
363 case 'C': /* The century number. */
364 i = 20;
365 bp = conv_num(bp, &i, 0, 99);
366
367 i = i * 100 - TM_YEAR_BASE;
368 if (split_year)
369 i += tm->tm_year % 100;
370 split_year = 1;
371 tm->tm_year = i;
372 LEGAL_ALT(ALT_E);
373 state |= S_YEAR;
374 continue;
375
376 case 'd': /* The day of month. */
377 case 'e':
378 bp = conv_num(bp, &tm->tm_mday, 1, 31);
379 LEGAL_ALT(ALT_O);
380 state |= S_MDAY;
381 continue;
382
383 case 'k': /* The hour (24-hour clock representation). */
384 LEGAL_ALT(0);
385 /* FALLTHROUGH */
386 case 'H':
387 bp = conv_num(bp, &tm->tm_hour, 0, 23);
388 LEGAL_ALT(ALT_O);
389 state |= S_HOUR;
390 continue;
391
392 case 'l': /* The hour (12-hour clock representation). */
393 LEGAL_ALT(0);
394 /* FALLTHROUGH */
395 case 'I':
396 bp = conv_num(bp, &tm->tm_hour, 1, 12);
397 if (tm->tm_hour == 12)
398 tm->tm_hour = 0;
399 LEGAL_ALT(ALT_O);
400 state |= S_HOUR;
401 continue;
402
403 case 'j': /* The day of year. */
404 i = 1;
405 bp = conv_num(bp, &i, 1, 366);
406 tm->tm_yday = i - 1;
407 LEGAL_ALT(0);
408 state |= S_YDAY;
409 continue;
410
411 case 'M': /* The minute. */
412 bp = conv_num(bp, &tm->tm_min, 0, 59);
413 LEGAL_ALT(ALT_O);
414 continue;
415
416 case 'm': /* The month. */
417 i = 1;
418 bp = conv_num(bp, &i, 1, 12);
419 tm->tm_mon = i - 1;
420 LEGAL_ALT(ALT_O);
421 state |= S_MON;
422 continue;
423
424 case 'p': /* The locale's equivalent of AM/PM. */
425 bp = find_string(bp, &i, am_pm, NULL, 2);
426 if (HAVE_HOUR(state) && tm->tm_hour > 11)
427 return NULL;
428 tm->tm_hour += i * 12;
429 LEGAL_ALT(0);
430 continue;
431
432 case 'S': /* The seconds. */
433 bp = conv_num(bp, &tm->tm_sec, 0, 61);
434 LEGAL_ALT(ALT_O);
435 continue;
436
437#ifndef TIME_MAX
438#if defined(_MSC_VER) || defined(__BORLANDC__) || defined(__NETWARE__) || defined(__NeXT__)
439#define TIME_MAX INT32_MAX
440#else
441#define TIME_MAX INT64_MAX
442#endif
443#endif
444 case 's': /* seconds since the epoch */
445 {
446 time_t sse = 0;
447#if defined(_MSC_VER) || defined(__BORLANDC__)
448 uint32_t rulim = TIME_MAX;
449#else
450 uint64_t rulim = TIME_MAX;
451#endif
452
453 if (*bp < '0' || *bp > '9') {
454 bp = NULL;
455 continue;
456 }
457
458 do {
459 sse *= 10;
460 sse += *bp++ - '0';
461 rulim /= 10;
462 } while ((sse * 10 <= TIME_MAX) &&
463 rulim && *bp >= '0' && *bp <= '9');
464#if defined(_MSC_VER) || defined(__BORLANDC__)
465 if (sse < 0 || (uint32_t)sse > TIME_MAX) {
466#else
467 if (sse < 0 || (uint64_t)sse > TIME_MAX) {
468#endif
469 bp = NULL;
470 continue;
471 }
472#if defined(_WIN32) || defined(__OS2__) || defined(__NeXT__) || defined(__DOS__)
473#if defined(_MSC_VER) || defined(__BORLANDC__) || defined(__WATCOMC__) || defined(__NeXT__)
474 if (1)
475#else
476 if (localtime_s(tm, &sse) == 0)
477#endif
478#else
479 if (localtime_r(&sse, tm))
480#endif
481 state |= S_YDAY | S_WDAY | S_MON | S_MDAY | S_YEAR;
482 else
483 bp = NULL;
484 }
485 continue;
486
487 case 'U': /* The week of year, beginning on sunday. */
488 case 'W': /* The week of year, beginning on monday. */
489 /*
490 * This is bogus, as we can not assume any valid
491 * information present in the tm structure at this
492 * point to calculate a real value, so save the
493 * week for now in case it can be used later.
494 */
495 bp = conv_num(bp, &i, 0, 53);
496 LEGAL_ALT(ALT_O);
497 if (c == 'U')
498 day_offset = TM_SUNDAY;
499 else
500 day_offset = TM_MONDAY;
501 week_offset = i;
502 continue;
503
504 case 'w': /* The day of week, beginning on sunday. */
505 bp = conv_num(bp, &tm->tm_wday, 0, 6);
506 LEGAL_ALT(ALT_O);
507 state |= S_WDAY;
508 continue;
509
510 case 'u': /* The day of week, monday = 1. */
511 bp = conv_num(bp, &i, 1, 7);
512 tm->tm_wday = i % 7;
513 LEGAL_ALT(ALT_O);
514 state |= S_WDAY;
515 continue;
516
517 case 'g': /* The year corresponding to the ISO week
518 * number but without the century.
519 */
520 bp = conv_num(bp, &i, 0, 99);
521 continue;
522
523 case 'G': /* The year corresponding to the ISO week
524 * number with century.
525 */
526 do
527 bp++;
528 while (isdigit(*bp));
529 continue;
530
531 case 'V': /* The ISO 8601:1988 week number as decimal */
532 bp = conv_num(bp, &i, 0, 53);
533 continue;
534
535 case 'Y': /* The year. */
536 i = TM_YEAR_BASE; /* just for data sanity... */
537 bp = conv_num(bp, &i, 0, 9999);
538 tm->tm_year = i - TM_YEAR_BASE;
539 LEGAL_ALT(ALT_E);
540 state |= S_YEAR;
541 continue;
542
543 case 'y': /* The year within 100 years of the epoch. */
544 /* LEGAL_ALT(ALT_E | ALT_O); */
545 bp = conv_num(bp, &i, 0, 99);
546
547 if (split_year)
548 /* preserve century */
549 i += (tm->tm_year / 100) * 100;
550 else {
551 split_year = 1;
552 if (i <= 68)
553 i = i + 2000 - TM_YEAR_BASE;
554 }
555 tm->tm_year = i;
556 state |= S_YEAR;
557 continue;
558
559 case 'Z': // time zone name
560 case 'z': //
561#ifdef _WIN32
562 _tzset();
563#else
564 tzset();
565#endif
566 mandatory = c == 'z';
567 /*
568 * We recognize all ISO 8601 formats:
569 * Z = Zulu time/UTC
570 * [+-]hhmm
571 * [+-]hh:mm
572 * [+-]hh
573 * We recognize all RFC-822/RFC-2822 formats:
574 * UT|GMT
575 * North American : UTC offsets
576 * E[DS]T = Eastern : -4 | -5
577 * C[DS]T = Central : -5 | -6
578 * M[DS]T = Mountain: -6 | -7
579 * P[DS]T = Pacific : -7 | -8
580 * Nautical/Military
581 * [A-IL-M] = -1 ... -9 (J not used)
582 * [N-Y] = +1 ... +12
583 * Note: J maybe used to denote non-nautical
584 * local time
585 */
586 if (mandatory)
587 while (isspace(*bp))
588 bp++;
589
590 zname = bp;
591 switch (*bp++) {
592 case 'G':
593 if (*bp++ != 'M')
594 goto namedzone;
595 /*FALLTHROUGH*/
596 case 'U':
597 if (*bp++ != 'T')
598 goto namedzone;
599 else if (!delim(*bp) && *bp++ != 'C')
600 goto namedzone;
601 /*FALLTHROUGH*/
602 case 'Z':
603 if (!delim(*bp))
604 goto namedzone;
605 tm->tm_isdst = 0;
606#ifdef TM_GMTOFF
607 tm->TM_GMTOFF = 0;
608#endif
609#ifdef TM_ZONE
610 tm->TM_ZONE = utc;
611#endif
612 continue;
613 case '+':
614 neg = 0;
615 break;
616 case '-':
617 neg = 1;
618 break;
619 default:
620namedzone:
621 bp = zname;
622
623 /* Nautical / Military style */
624 if (delim(bp[1]) &&
625 ((*bp >= 'A' && *bp <= 'I') ||
626 (*bp >= 'L' && *bp <= 'Y'))) {
627#ifdef TM_GMTOFF
628 /* Argh! No 'J'! */
629 if (*bp >= 'A' && *bp <= 'I')
630 tm->TM_GMTOFF =
631 (int)*bp - ('A' - 1);
632 else if (*bp >= 'L' && *bp <= 'M')
633 tm->TM_GMTOFF = (int)*bp - 'A';
634 else if (*bp >= 'N' && *bp <= 'Y')
635 tm->TM_GMTOFF = 'M' - (int)*bp;
636 tm->TM_GMTOFF *= SECSPERHOUR;
637#endif
638#ifdef TM_ZONE
639 tm->TM_ZONE = NULL; /* XXX */
640#endif
641 bp++;
642 continue;
643 }
644 /* 'J' is local time */
645 if (delim(bp[1]) && *bp == 'J') {
646#ifdef TM_GMTOFF
647 tm->TM_GMTOFF = -timezone;
648#endif
649#ifdef TM_ZONE
650 tm->TM_ZONE = NULL; /* XXX */
651#endif
652 bp++;
653 continue;
654 }
655
656 /*
657 * From our 3 letter hard-coded table
658 * XXX: Can be removed, handled by tzload()
659 */
660 if (delim(bp[0]) || delim(bp[1]) ||
661 delim(bp[2]) || !delim(bp[3]))
662 goto loadzone;
663 ep = find_string(bp, &i, nast, NULL, 4);
664 if (ep != NULL) {
665#ifdef TM_GMTOFF
666 tm->TM_GMTOFF = (-5 - i) * SECSPERHOUR;
667#endif
668#ifdef TM_ZONE
669 tm->TM_ZONE = __UNCONST(nast[i]);
670#endif
671 bp = ep;
672 continue;
673 }
674 ep = find_string(bp, &i, nadt, NULL, 4);
675 if (ep != NULL) {
676 tm->tm_isdst = 1;
677#ifdef TM_GMTOFF
678 tm->TM_GMTOFF = (-4 - i) * SECSPERHOUR;
679#endif
680#ifdef TM_ZONE
681 tm->TM_ZONE = __UNCONST(nadt[i]);
682#endif
683 bp = ep;
684 continue;
685 }
686 /*
687 * Our current timezone
688 */
689 ep = find_string(bp, &i,
690 (const char * const *)NULL,
691 NULL, 2);
692 if (ep != NULL) {
693 tm->tm_isdst = i;
694#ifdef TM_GMTOFF
695 tm->TM_GMTOFF = -timezone;
696#endif
697#ifdef TM_ZONE
698 tm->TM_ZONE = tzname[i];
699#endif
700 bp = ep;
701 continue;
702 }
703loadzone:
704 /*
705 * The hard way, load the zone!
706 */
707 if (fromzone(&bp, tm, mandatory))
708 continue;
709 goto out;
710 }
711 offs = 0;
712 for (i = 0; i < 4; ) {
713 if (isdigit(*bp)) {
714 offs = offs * 10 + (*bp++ - '0');
715 i++;
716 continue;
717 }
718 if (i == 2 && *bp == ':') {
719 bp++;
720 continue;
721 }
722 break;
723 }
724 if (isdigit(*bp))
725 goto out;
726 switch (i) {
727 case 2:
728 offs *= SECSPERHOUR;
729 break;
730 case 4:
731 i = offs % 100;
732 offs /= 100;
733 if (i >= SECSPERMIN)
734 goto out;
735 /* Convert minutes into decimal */
736 offs = offs * SECSPERHOUR + i * SECSPERMIN;
737 break;
738 default:
739out:
740 if (mandatory)
741 return NULL;
742 bp = zname;
743 continue;
744 }
745 /* ISO 8601 & RFC 3339 limit to 23:59 max */
746 if (offs >= (HOURSPERDAY * SECSPERHOUR))
747 goto out;
748 if (neg)
749 offs = -offs;
750 tm->tm_isdst = 0; /* XXX */
751#ifdef TM_GMTOFF
752 tm->TM_GMTOFF = offs;
753#endif
754#ifdef TM_ZONE
755 tm->TM_ZONE = NULL; /* XXX */
756#endif
757 continue;
758
759 /*
760 * Miscellaneous conversions.
761 */
762 case 'n': /* Any kind of white-space. */
763 case 't':
764 while (isspace(*bp))
765 bp++;
766 LEGAL_ALT(0);
767 continue;
768
769
770 default: /* Unknown/unsupported conversion. */
771 return NULL;
772 }
773 }
774
775 if (!HAVE_YDAY(state) && HAVE_YEAR(state)) {
776 if (HAVE_MON(state) && HAVE_MDAY(state)) {
777 /* calculate day of year (ordinal date) */
778 tm->tm_yday = start_of_month[isleap_sum(tm->tm_year,
779 TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);
780 state |= S_YDAY;
781 } else if (day_offset != -1) {
782 /*
783 * Set the date to the first Sunday (or Monday)
784 * of the specified week of the year.
785 */
786 if (!HAVE_WDAY(state)) {
787 tm->tm_wday = day_offset;
788 state |= S_WDAY;
789 }
790 tm->tm_yday = (7 -
791 first_wday_of(tm->tm_year + TM_YEAR_BASE) +
792 day_offset) % 7 + (week_offset - 1) * 7 +
793 tm->tm_wday - day_offset;
794 state |= S_YDAY;
795 }
796 }
797
798 if (HAVE_YDAY(state) && HAVE_YEAR(state)) {
799 int isleap;
800
801 if (!HAVE_MON(state)) {
802 /* calculate month of day of year */
803 i = 0;
804 isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE);
805 while (tm->tm_yday >= start_of_month[isleap][i])
806 i++;
807 if (i > 12) {
808 i = 1;
809 tm->tm_yday -= start_of_month[isleap][12];
810 tm->tm_year++;
811 }
812 tm->tm_mon = i - 1;
813 state |= S_MON;
814 }
815
816 if (!HAVE_MDAY(state)) {
817 /* calculate day of month */
818 isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE);
819 tm->tm_mday = tm->tm_yday -
820 start_of_month[isleap][tm->tm_mon] + 1;
821 state |= S_MDAY;
822 }
823
824 if (!HAVE_WDAY(state)) {
825 /* calculate day of week */
826 i = 0;
827 week_offset = first_wday_of(tm->tm_year);
828 while (i++ <= tm->tm_yday) {
829 if (week_offset++ >= 6)
830 week_offset = 0;
831 }
832 tm->tm_wday = week_offset;
833 state |= S_WDAY;
834 }
835 }
836
837 return (char*)bp;
838}
839
840
841static const unsigned char *
842conv_num(const unsigned char *buf, int *dest, unsigned int llim, unsigned int ulim)
843{
844 unsigned int result = 0;
845 unsigned char ch;
846
847 /* The limit also determines the number of valid digits. */
848 unsigned int rulim = ulim;
849
850 ch = *buf;
851 if (ch < '0' || ch > '9')
852 return NULL;
853
854 do {
855 result *= 10;
856 result += ch - '0';
857 rulim /= 10;
858 ch = *++buf;
859 } while ((result <= ulim) && rulim && ch >= '0' && ch <= '9');
860
861 if (result < llim || result > ulim)
862 return NULL;
863
864 *dest = result;
865 return buf;
866}
867
868static const unsigned char *
869find_string(const unsigned char *bp, int *tgt, const char * const *n1,
870 const char * const *n2, int c)
871{
872 int i;
873 size_t len;
874
875 /* check full name - then abbreviated ones */
876 for (; n1 != NULL; n1 = n2, n2 = NULL) {
877 for (i = 0; i < c; i++, n1++) {
878 len = strlen(*n1);
879 if (strncasecmp(*n1, (const char *)bp, len) == 0) {
880 *tgt = i;
881 return bp + len;
882 }
883 }
884 }
885
886 /* Nothing matched */
887 return NULL;
888}
889
890#endif
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