source: Main/trunk/Server/strptime.c@ 215

Last change on this file since 215 was 215, checked in by Nishi, on Oct 3, 2024 at 4:24:43 AM

can be compiled using bcc32 now
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File size: 25.2 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__)
39
40#include <ctype.h>
41#include <string.h>
42#include <time.h>
43#include <stdint.h>
44
45static const unsigned char *conv_num(const unsigned char *, int *, unsigned int, unsigned int);
46static const unsigned char *find_string(const unsigned char *, int *, const char * const *, const char * const *, int);
47
48/*
49 * We do not implement alternate representations. However, we always
50 * check whether a given modifier is allowed for a certain conversion.
51 */
52#define ALT_E 0x01
53#define ALT_O 0x02
54#define LEGAL_ALT(x) { if (alt_format & ~(x)) return NULL; }
55
56#define TM_YEAR_BASE 1900
57
58#define TM_SUNDAY 0
59#define TM_MONDAY 1
60#define TM_TUESDAY 2
61#define TM_WEDNESDAY 3
62#define TM_THURSDAY 4
63#define TM_FRIDAY 5
64#define TM_SATURDAY 6
65
66#define S_YEAR (1 << 0)
67#define S_MON (1 << 1)
68#define S_YDAY (1 << 2)
69#define S_MDAY (1 << 3)
70#define S_WDAY (1 << 4)
71#define S_HOUR (1 << 5)
72
73#define HAVE_MDAY(s) (s & S_MDAY)
74#define HAVE_MON(s) (s & S_MON)
75#define HAVE_WDAY(s) (s & S_WDAY)
76#define HAVE_YDAY(s) (s & S_YDAY)
77#define HAVE_YEAR(s) (s & S_YEAR)
78#define HAVE_HOUR(s) (s & S_HOUR)
79
80#define SECSPERMIN 60
81#define MINSPERHOUR 60
82#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
83#define HOURSPERDAY 24
84
85#define HERE_D_T_FMT "%a %b %e %H:%M:%S %Y"
86#define HERE_D_FMT "%y/%m/%d"
87#define HERE_T_FMT_AMPM "%I:%M:%S %p"
88#define HERE_T_FMT "%H:%M:%S"
89
90#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
91
92/*
93** Since everything in isleap is modulo 400 (or a factor of 400), we know that
94** isleap(y) == isleap(y % 400)
95** and so
96** isleap(a + b) == isleap((a + b) % 400)
97** or
98** isleap(a + b) == isleap(a % 400 + b % 400)
99** This is true even if % means modulo rather than Fortran remainder
100** (which is allowed by C89 but not by C99 or later).
101** We use this to avoid addition overflow problems.
102*/
103
104#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
105
106#if defined(_MSC_VER) || defined(__BORLANDC__)
107#define tzname _tzname
108#define strncasecmp _strnicmp
109#endif
110
111#ifdef __BORLANDC__
112char* cm_strdup(const char* str);
113
114int _strnicmp(const char* _a, const char* _b, int len){
115 char* a = cm_strdup(_a);
116 char* b = cm_strdup(_b);
117 int i;
118 char* r;
119 for(i = 0; a[i] != 0; i++){
120 a[i] = tolower(a[i]);
121 }
122 for(i = 0; b[i] != 0; i++){
123 b[i] = tolower(b[i]);
124 }
125 r = strncmp(a, b, len);
126 free(a);
127 free(b);
128 return r;
129}
130#endif
131
132#ifdef TM_ZONE
133static char* utc = "UTC";
134#endif
135/* RFC-822/RFC-2822 */
136static const char* const nast[] = {
137 "EST", "CST", "MST", "PST", "\0\0\0"
138};
139static const char* const nadt[] = {
140 "EDT", "CDT", "MDT", "PDT", "\0\0\0"
141};
142static const char* weekday_name[] =
143{
144 "Sunday", "Monday", "Tuesday", "Wednesday",
145 "Thursday", "Friday", "Saturday"
146};
147static const char* ab_weekday_name[] =
148{
149 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
150};
151static const char* month_name[] =
152{
153 "January", "February", "March", "April", "May", "June",
154 "July", "August", "September", "October", "November", "December"
155};
156static const char* ab_month_name[] =
157{
158 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
159 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
160};
161static const char* am_pm[] = {"AM", "PM"};
162
163
164/*
165 * Table to determine the ordinal date for the start of a month.
166 * Ref: http://en.wikipedia.org/wiki/ISO_week_date
167 */
168static const int start_of_month[2][13] = {
169 /* non-leap year */
170 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
171 /* leap year */
172 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
173};
174
175/*
176 * Calculate the week day of the first day of a year. Valid for
177 * the Gregorian calendar, which began Sept 14, 1752 in the UK
178 * and its colonies. Ref:
179 * http://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week
180 */
181
182static int
183first_wday_of(int yr)
184{
185 return ((2 * (3 - (yr / 100) % 4)) + (yr % 100) + ((yr % 100) / 4) +
186 (isleap(yr) ? 6 : 0) + 1) % 7;
187}
188
189#define delim(p) ((p) == '\0' || isspace((unsigned char)(p)))
190
191static int
192fromzone(const unsigned char **bp, struct tm *tm, int mandatory)
193{
194// timezone_t tz;
195 char buf[512], *p;
196 const unsigned char *rp;
197
198 for (p = buf, rp = *bp; !delim(*rp) && p < &buf[sizeof(buf) - 1]; rp++)
199 *p++ = *rp;
200 *p = '\0';
201
202 if (mandatory)
203 *bp = rp;
204 if (!isalnum((unsigned char)*buf))
205 return 0;
206// tz = tzalloc(buf);
207// if (tz == NULL)
208// return 0;
209
210 *bp = rp;
211 tm->tm_isdst = 0; /* XXX */
212#ifdef TM_GMTOFF
213 tm->TM_GMTOFF = tzgetgmtoff(tz, tm->tm_isdst);
214#endif
215#ifdef TM_ZONE
216 // Can't use tzgetname() here because we are going to free()
217 tm->TM_ZONE = NULL; /* XXX */
218#endif
219// tzfree(tz);
220 return 1;
221}
222
223char* strptime(const char *buf, const char *fmt, struct tm *tm)
224{
225 unsigned char c;
226 const unsigned char *bp, *ep, *zname;
227 int alt_format, i, split_year = 0, neg = 0, state = 0,
228 day_offset = -1, week_offset = 0, offs, mandatory;
229 const char *new_fmt;
230
231 bp = (const unsigned char *)buf;
232
233 while (bp != NULL && (c = *fmt++) != '\0') {
234 /* Clear `alternate' modifier prior to new conversion. */
235 alt_format = 0;
236 i = 0;
237
238 /* Eat up white-space. */
239 if (isspace(c)) {
240 while (isspace(*bp))
241 bp++;
242 continue;
243 }
244
245 if (c != '%')
246 goto literal;
247
248
249again: switch (c = *fmt++) {
250 case '%': /* "%%" is converted to "%". */
251literal:
252 if (c != *bp++)
253 return NULL;
254 LEGAL_ALT(0);
255 continue;
256
257 /*
258 * "Alternative" modifiers. Just set the appropriate flag
259 * and start over again.
260 */
261 case 'E': /* "%E?" alternative conversion modifier. */
262 LEGAL_ALT(0);
263 alt_format |= ALT_E;
264 goto again;
265
266 case 'O': /* "%O?" alternative conversion modifier. */
267 LEGAL_ALT(0);
268 alt_format |= ALT_O;
269 goto again;
270
271 /*
272 * "Complex" conversion rules, implemented through recursion.
273 */
274 case 'c': /* Date and time, using the locale's format. */
275// new_fmt = _TIME_LOCALE(loc)->d_t_fmt;
276 new_fmt = HERE_D_T_FMT;
277 state |= S_WDAY | S_MON | S_MDAY | S_YEAR;
278 goto recurse;
279
280 case 'F': /* The date as "%Y-%m-%d". */
281 new_fmt = "%Y-%m-%d";
282 LEGAL_ALT(0);
283 state |= S_MON | S_MDAY | S_YEAR;
284 goto recurse;
285
286 case 'R': /* The time as "%H:%M". */
287 new_fmt = "%H:%M";
288 LEGAL_ALT(0);
289 goto recurse;
290
291 case 'r': /* The time in 12-hour clock representation. */
292// new_fmt = _TIME_LOCALE(loc)->t_fmt_ampm;
293 new_fmt = HERE_T_FMT_AMPM;
294 LEGAL_ALT(0);
295 goto recurse;
296
297 case 'X': /* The time, using the locale's format. */
298 /* fall through */
299
300 case 'T': /* The time as "%H:%M:%S". */
301 new_fmt = HERE_T_FMT;
302 LEGAL_ALT(0);
303
304recurse:
305 bp = (const unsigned char *)strptime((const char *)bp,
306 new_fmt, tm);
307 LEGAL_ALT(ALT_E);
308 continue;
309
310 case 'x': /* The date, using the locale's format. */
311 /* fall throug */
312
313 case 'D': /* The date as "%y/%m/%d". */
314 {
315 int year;
316 new_fmt = HERE_D_FMT;
317 LEGAL_ALT(0);
318 state |= S_MON | S_MDAY | S_YEAR;
319 year = split_year ? tm->tm_year : 0;
320
321 bp = (const unsigned char *)strptime((const char *)bp,
322 new_fmt, tm);
323 LEGAL_ALT(ALT_E);
324 tm->tm_year += year;
325 if (split_year && tm->tm_year % (2000 - TM_YEAR_BASE) <= 68)
326 tm->tm_year -= 2000 - TM_YEAR_BASE;
327 split_year = 1;
328 continue;
329 }
330 /*
331 * "Elementary" conversion rules.
332 */
333 case 'A': /* The day of week, using the locale's form. */
334 case 'a':
335 bp = find_string(bp, &tm->tm_wday, weekday_name, ab_weekday_name, 7);
336 LEGAL_ALT(0);
337 state |= S_WDAY;
338 continue;
339
340 case 'B': /* The month, using the locale's form. */
341 case 'b':
342 case 'h':
343 bp = find_string(bp, &tm->tm_mon, month_name, ab_month_name, 12);
344 LEGAL_ALT(0);
345 state |= S_MON;
346 continue;
347
348 case 'C': /* The century number. */
349 i = 20;
350 bp = conv_num(bp, &i, 0, 99);
351
352 i = i * 100 - TM_YEAR_BASE;
353 if (split_year)
354 i += tm->tm_year % 100;
355 split_year = 1;
356 tm->tm_year = i;
357 LEGAL_ALT(ALT_E);
358 state |= S_YEAR;
359 continue;
360
361 case 'd': /* The day of month. */
362 case 'e':
363 bp = conv_num(bp, &tm->tm_mday, 1, 31);
364 LEGAL_ALT(ALT_O);
365 state |= S_MDAY;
366 continue;
367
368 case 'k': /* The hour (24-hour clock representation). */
369 LEGAL_ALT(0);
370 /* FALLTHROUGH */
371 case 'H':
372 bp = conv_num(bp, &tm->tm_hour, 0, 23);
373 LEGAL_ALT(ALT_O);
374 state |= S_HOUR;
375 continue;
376
377 case 'l': /* The hour (12-hour clock representation). */
378 LEGAL_ALT(0);
379 /* FALLTHROUGH */
380 case 'I':
381 bp = conv_num(bp, &tm->tm_hour, 1, 12);
382 if (tm->tm_hour == 12)
383 tm->tm_hour = 0;
384 LEGAL_ALT(ALT_O);
385 state |= S_HOUR;
386 continue;
387
388 case 'j': /* The day of year. */
389 i = 1;
390 bp = conv_num(bp, &i, 1, 366);
391 tm->tm_yday = i - 1;
392 LEGAL_ALT(0);
393 state |= S_YDAY;
394 continue;
395
396 case 'M': /* The minute. */
397 bp = conv_num(bp, &tm->tm_min, 0, 59);
398 LEGAL_ALT(ALT_O);
399 continue;
400
401 case 'm': /* The month. */
402 i = 1;
403 bp = conv_num(bp, &i, 1, 12);
404 tm->tm_mon = i - 1;
405 LEGAL_ALT(ALT_O);
406 state |= S_MON;
407 continue;
408
409 case 'p': /* The locale's equivalent of AM/PM. */
410 bp = find_string(bp, &i, am_pm, NULL, 2);
411 if (HAVE_HOUR(state) && tm->tm_hour > 11)
412 return NULL;
413 tm->tm_hour += i * 12;
414 LEGAL_ALT(0);
415 continue;
416
417 case 'S': /* The seconds. */
418 bp = conv_num(bp, &tm->tm_sec, 0, 61);
419 LEGAL_ALT(ALT_O);
420 continue;
421
422#ifndef TIME_MAX
423#if defined(_MSC_VER) || defined(__BORLANDC__)
424#define TIME_MAX INT32_MAX
425#else
426#define TIME_MAX INT64_MAX
427#endif
428#endif
429 case 's': /* seconds since the epoch */
430 {
431 time_t sse = 0;
432#if defined(_MSC_VER) || defined(__BORLANDC__)
433 uint32_t rulim = TIME_MAX;
434#else
435 uint64_t rulim = TIME_MAX;
436#endif
437
438 if (*bp < '0' || *bp > '9') {
439 bp = NULL;
440 continue;
441 }
442
443 do {
444 sse *= 10;
445 sse += *bp++ - '0';
446 rulim /= 10;
447 } while ((sse * 10 <= TIME_MAX) &&
448 rulim && *bp >= '0' && *bp <= '9');
449#if defined(_MSC_VER) || defined(__BORLANDC__)
450 if (sse < 0 || (uint32_t)sse > TIME_MAX) {
451#else
452 if (sse < 0 || (uint64_t)sse > TIME_MAX) {
453#endif
454 bp = NULL;
455 continue;
456 }
457#ifdef _WIN32
458#if defined(_MSC_VER) || defined(__BORLANDC__)
459 if (1)
460#else
461 if (localtime_s(tm, &sse) == 0)
462#endif
463#else
464 if (localtime_r(&sse, tm))
465#endif
466 state |= S_YDAY | S_WDAY | S_MON | S_MDAY | S_YEAR;
467 else
468 bp = NULL;
469 }
470 continue;
471
472 case 'U': /* The week of year, beginning on sunday. */
473 case 'W': /* The week of year, beginning on monday. */
474 /*
475 * This is bogus, as we can not assume any valid
476 * information present in the tm structure at this
477 * point to calculate a real value, so save the
478 * week for now in case it can be used later.
479 */
480 bp = conv_num(bp, &i, 0, 53);
481 LEGAL_ALT(ALT_O);
482 if (c == 'U')
483 day_offset = TM_SUNDAY;
484 else
485 day_offset = TM_MONDAY;
486 week_offset = i;
487 continue;
488
489 case 'w': /* The day of week, beginning on sunday. */
490 bp = conv_num(bp, &tm->tm_wday, 0, 6);
491 LEGAL_ALT(ALT_O);
492 state |= S_WDAY;
493 continue;
494
495 case 'u': /* The day of week, monday = 1. */
496 bp = conv_num(bp, &i, 1, 7);
497 tm->tm_wday = i % 7;
498 LEGAL_ALT(ALT_O);
499 state |= S_WDAY;
500 continue;
501
502 case 'g': /* The year corresponding to the ISO week
503 * number but without the century.
504 */
505 bp = conv_num(bp, &i, 0, 99);
506 continue;
507
508 case 'G': /* The year corresponding to the ISO week
509 * number with century.
510 */
511 do
512 bp++;
513 while (isdigit(*bp));
514 continue;
515
516 case 'V': /* The ISO 8601:1988 week number as decimal */
517 bp = conv_num(bp, &i, 0, 53);
518 continue;
519
520 case 'Y': /* The year. */
521 i = TM_YEAR_BASE; /* just for data sanity... */
522 bp = conv_num(bp, &i, 0, 9999);
523 tm->tm_year = i - TM_YEAR_BASE;
524 LEGAL_ALT(ALT_E);
525 state |= S_YEAR;
526 continue;
527
528 case 'y': /* The year within 100 years of the epoch. */
529 /* LEGAL_ALT(ALT_E | ALT_O); */
530 bp = conv_num(bp, &i, 0, 99);
531
532 if (split_year)
533 /* preserve century */
534 i += (tm->tm_year / 100) * 100;
535 else {
536 split_year = 1;
537 if (i <= 68)
538 i = i + 2000 - TM_YEAR_BASE;
539 }
540 tm->tm_year = i;
541 state |= S_YEAR;
542 continue;
543
544 case 'Z': // time zone name
545 case 'z': //
546#ifdef _WIN32
547 _tzset();
548#else
549 tzset();
550#endif
551 mandatory = c == 'z';
552 /*
553 * We recognize all ISO 8601 formats:
554 * Z = Zulu time/UTC
555 * [+-]hhmm
556 * [+-]hh:mm
557 * [+-]hh
558 * We recognize all RFC-822/RFC-2822 formats:
559 * UT|GMT
560 * North American : UTC offsets
561 * E[DS]T = Eastern : -4 | -5
562 * C[DS]T = Central : -5 | -6
563 * M[DS]T = Mountain: -6 | -7
564 * P[DS]T = Pacific : -7 | -8
565 * Nautical/Military
566 * [A-IL-M] = -1 ... -9 (J not used)
567 * [N-Y] = +1 ... +12
568 * Note: J maybe used to denote non-nautical
569 * local time
570 */
571 if (mandatory)
572 while (isspace(*bp))
573 bp++;
574
575 zname = bp;
576 switch (*bp++) {
577 case 'G':
578 if (*bp++ != 'M')
579 goto namedzone;
580 /*FALLTHROUGH*/
581 case 'U':
582 if (*bp++ != 'T')
583 goto namedzone;
584 else if (!delim(*bp) && *bp++ != 'C')
585 goto namedzone;
586 /*FALLTHROUGH*/
587 case 'Z':
588 if (!delim(*bp))
589 goto namedzone;
590 tm->tm_isdst = 0;
591#ifdef TM_GMTOFF
592 tm->TM_GMTOFF = 0;
593#endif
594#ifdef TM_ZONE
595 tm->TM_ZONE = utc;
596#endif
597 continue;
598 case '+':
599 neg = 0;
600 break;
601 case '-':
602 neg = 1;
603 break;
604 default:
605namedzone:
606 bp = zname;
607
608 /* Nautical / Military style */
609 if (delim(bp[1]) &&
610 ((*bp >= 'A' && *bp <= 'I') ||
611 (*bp >= 'L' && *bp <= 'Y'))) {
612#ifdef TM_GMTOFF
613 /* Argh! No 'J'! */
614 if (*bp >= 'A' && *bp <= 'I')
615 tm->TM_GMTOFF =
616 (int)*bp - ('A' - 1);
617 else if (*bp >= 'L' && *bp <= 'M')
618 tm->TM_GMTOFF = (int)*bp - 'A';
619 else if (*bp >= 'N' && *bp <= 'Y')
620 tm->TM_GMTOFF = 'M' - (int)*bp;
621 tm->TM_GMTOFF *= SECSPERHOUR;
622#endif
623#ifdef TM_ZONE
624 tm->TM_ZONE = NULL; /* XXX */
625#endif
626 bp++;
627 continue;
628 }
629 /* 'J' is local time */
630 if (delim(bp[1]) && *bp == 'J') {
631#ifdef TM_GMTOFF
632 tm->TM_GMTOFF = -timezone;
633#endif
634#ifdef TM_ZONE
635 tm->TM_ZONE = NULL; /* XXX */
636#endif
637 bp++;
638 continue;
639 }
640
641 /*
642 * From our 3 letter hard-coded table
643 * XXX: Can be removed, handled by tzload()
644 */
645 if (delim(bp[0]) || delim(bp[1]) ||
646 delim(bp[2]) || !delim(bp[3]))
647 goto loadzone;
648 ep = find_string(bp, &i, nast, NULL, 4);
649 if (ep != NULL) {
650#ifdef TM_GMTOFF
651 tm->TM_GMTOFF = (-5 - i) * SECSPERHOUR;
652#endif
653#ifdef TM_ZONE
654 tm->TM_ZONE = __UNCONST(nast[i]);
655#endif
656 bp = ep;
657 continue;
658 }
659 ep = find_string(bp, &i, nadt, NULL, 4);
660 if (ep != NULL) {
661 tm->tm_isdst = 1;
662#ifdef TM_GMTOFF
663 tm->TM_GMTOFF = (-4 - i) * SECSPERHOUR;
664#endif
665#ifdef TM_ZONE
666 tm->TM_ZONE = __UNCONST(nadt[i]);
667#endif
668 bp = ep;
669 continue;
670 }
671 /*
672 * Our current timezone
673 */
674 ep = find_string(bp, &i,
675 (const char * const *)NULL,
676 NULL, 2);
677 if (ep != NULL) {
678 tm->tm_isdst = i;
679#ifdef TM_GMTOFF
680 tm->TM_GMTOFF = -timezone;
681#endif
682#ifdef TM_ZONE
683 tm->TM_ZONE = tzname[i];
684#endif
685 bp = ep;
686 continue;
687 }
688loadzone:
689 /*
690 * The hard way, load the zone!
691 */
692 if (fromzone(&bp, tm, mandatory))
693 continue;
694 goto out;
695 }
696 offs = 0;
697 for (i = 0; i < 4; ) {
698 if (isdigit(*bp)) {
699 offs = offs * 10 + (*bp++ - '0');
700 i++;
701 continue;
702 }
703 if (i == 2 && *bp == ':') {
704 bp++;
705 continue;
706 }
707 break;
708 }
709 if (isdigit(*bp))
710 goto out;
711 switch (i) {
712 case 2:
713 offs *= SECSPERHOUR;
714 break;
715 case 4:
716 i = offs % 100;
717 offs /= 100;
718 if (i >= SECSPERMIN)
719 goto out;
720 /* Convert minutes into decimal */
721 offs = offs * SECSPERHOUR + i * SECSPERMIN;
722 break;
723 default:
724out:
725 if (mandatory)
726 return NULL;
727 bp = zname;
728 continue;
729 }
730 /* ISO 8601 & RFC 3339 limit to 23:59 max */
731 if (offs >= (HOURSPERDAY * SECSPERHOUR))
732 goto out;
733 if (neg)
734 offs = -offs;
735 tm->tm_isdst = 0; /* XXX */
736#ifdef TM_GMTOFF
737 tm->TM_GMTOFF = offs;
738#endif
739#ifdef TM_ZONE
740 tm->TM_ZONE = NULL; /* XXX */
741#endif
742 continue;
743
744 /*
745 * Miscellaneous conversions.
746 */
747 case 'n': /* Any kind of white-space. */
748 case 't':
749 while (isspace(*bp))
750 bp++;
751 LEGAL_ALT(0);
752 continue;
753
754
755 default: /* Unknown/unsupported conversion. */
756 return NULL;
757 }
758 }
759
760 if (!HAVE_YDAY(state) && HAVE_YEAR(state)) {
761 if (HAVE_MON(state) && HAVE_MDAY(state)) {
762 /* calculate day of year (ordinal date) */
763 tm->tm_yday = start_of_month[isleap_sum(tm->tm_year,
764 TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);
765 state |= S_YDAY;
766 } else if (day_offset != -1) {
767 /*
768 * Set the date to the first Sunday (or Monday)
769 * of the specified week of the year.
770 */
771 if (!HAVE_WDAY(state)) {
772 tm->tm_wday = day_offset;
773 state |= S_WDAY;
774 }
775 tm->tm_yday = (7 -
776 first_wday_of(tm->tm_year + TM_YEAR_BASE) +
777 day_offset) % 7 + (week_offset - 1) * 7 +
778 tm->tm_wday - day_offset;
779 state |= S_YDAY;
780 }
781 }
782
783 if (HAVE_YDAY(state) && HAVE_YEAR(state)) {
784 int isleap;
785
786 if (!HAVE_MON(state)) {
787 /* calculate month of day of year */
788 i = 0;
789 isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE);
790 while (tm->tm_yday >= start_of_month[isleap][i])
791 i++;
792 if (i > 12) {
793 i = 1;
794 tm->tm_yday -= start_of_month[isleap][12];
795 tm->tm_year++;
796 }
797 tm->tm_mon = i - 1;
798 state |= S_MON;
799 }
800
801 if (!HAVE_MDAY(state)) {
802 /* calculate day of month */
803 isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE);
804 tm->tm_mday = tm->tm_yday -
805 start_of_month[isleap][tm->tm_mon] + 1;
806 state |= S_MDAY;
807 }
808
809 if (!HAVE_WDAY(state)) {
810 /* calculate day of week */
811 i = 0;
812 week_offset = first_wday_of(tm->tm_year);
813 while (i++ <= tm->tm_yday) {
814 if (week_offset++ >= 6)
815 week_offset = 0;
816 }
817 tm->tm_wday = week_offset;
818 state |= S_WDAY;
819 }
820 }
821
822 return (char*)bp;
823}
824
825
826static const unsigned char *
827conv_num(const unsigned char *buf, int *dest, unsigned int llim, unsigned int ulim)
828{
829 unsigned int result = 0;
830 unsigned char ch;
831
832 /* The limit also determines the number of valid digits. */
833 unsigned int rulim = ulim;
834
835 ch = *buf;
836 if (ch < '0' || ch > '9')
837 return NULL;
838
839 do {
840 result *= 10;
841 result += ch - '0';
842 rulim /= 10;
843 ch = *++buf;
844 } while ((result <= ulim) && rulim && ch >= '0' && ch <= '9');
845
846 if (result < llim || result > ulim)
847 return NULL;
848
849 *dest = result;
850 return buf;
851}
852
853static const unsigned char *
854find_string(const unsigned char *bp, int *tgt, const char * const *n1,
855 const char * const *n2, int c)
856{
857 int i;
858 size_t len;
859
860 /* check full name - then abbreviated ones */
861 for (; n1 != NULL; n1 = n2, n2 = NULL) {
862 for (i = 0; i < c; i++, n1++) {
863 len = strlen(*n1);
864 if (strncasecmp(*n1, (const char *)bp, len) == 0) {
865 *tgt = i;
866 return bp + len;
867 }
868 }
869 }
870
871 /* Nothing matched */
872 return NULL;
873}
874
875#endif
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