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1 /*
2 * Copyright (c) 1989 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * advertising materials, and other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley. The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16 */
17
18 #ifndef lint
19 #ifndef NOID
20 static const char elsieid[] = "@(#)strftime.3 8.3";
21 /*
22 ** Based on the UCB version with the ID appearing below.
23 ** This is ANSIish only when "multibyte character == plain character".
24 */
25 #endif /* !defined NOID */
26 #endif /* !defined lint */
27
28 #include "xlocale_private.h"
29
30 #include "namespace.h"
31 #include "private.h"
32
33 #if defined(LIBC_SCCS) && !defined(lint)
34 static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89";
35 #endif /* LIBC_SCCS and not lint */
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD: src/lib/libc/stdtime/strftime.c,v 1.44 2009/06/09 09:02:58 delphij Exp $");
38
39 #include "tzfile.h"
40 #include <time.h>
41 #include <fcntl.h>
42 #include <sys/stat.h>
43 #include "un-namespace.h"
44 #include "timelocal.h"
45
46 #if !BUILDING_VARIANT
47 static char * _add(const char *, char *, const char *);
48 static char * _conv(int, const char *, char *, const char *, locale_t);
49 static char * _yconv(int, int, int, int, char *, const char *, locale_t);
50 #endif
51 #define _fmt _st_fmt
52 __private_extern__ char * _fmt(const char *, const struct tm *, char *, const char *,
53 int *, struct lc_time_T *, locale_t);
54
55 extern char * tzname[];
56 __private_extern__ long __darwin_altzone; /* DST timezone offset */
57 #define altzone __darwin_altzone
58 __private_extern__ long _st_get_timezone(void);
59
60 #ifndef YEAR_2000_NAME
61 #define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS"
62 #endif /* !defined YEAR_2000_NAME */
63
64 #define IN_NONE 0
65 #define IN_SOME 1
66 #define IN_THIS 2
67 #define IN_ALL 3
68
69 #define PAD_DEFAULT 0
70 #define PAD_LESS 1
71 #define PAD_SPACE 2
72 #define PAD_ZERO 3
73
74 #ifndef BUILDING_VARIANT
75 static const char* fmt_padding[][4] = {
76 /* DEFAULT, LESS, SPACE, ZERO */
77 #define PAD_FMT_MONTHDAY 0
78 #define PAD_FMT_HMS 0
79 #define PAD_FMT_CENTURY 0
80 #define PAD_FMT_SHORTYEAR 0
81 #define PAD_FMT_MONTH 0
82 #define PAD_FMT_WEEKOFYEAR 0
83 #define PAD_FMT_DAYOFMONTH 0
84 { "%02d", "%d", "%2d", "%02d" },
85 #define PAD_FMT_SDAYOFMONTH 1
86 #define PAD_FMT_SHMS 1
87 { "%2d", "%d", "%2d", "%02d" },
88 #define PAD_FMT_DAYOFYEAR 2
89 { "%03d", "%d", "%3d", "%03d" },
90 #define PAD_FMT_YEAR 3
91 { "%04d", "%d", "%4d", "%04d" }
92 };
93 #endif
94
95 #define USG_COMPAT
96 #define ALTZONE
97
98 size_t
99 strftime_l(char * __restrict s, size_t maxsize, const char * __restrict format,
100 const struct tm * __restrict t, locale_t loc)
101 {
102 char * p;
103 int warn;
104
105 NORMALIZE_LOCALE(loc);
106 tzset();
107 warn = IN_NONE;
108 p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn, __get_current_time_locale(loc), loc);
109 #ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
110 if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) {
111 (void) fputs("\n", stderr);
112 if (format == NULL)
113 (void) fputs("NULL strftime format ", stderr);
114 else (void) fprintf_l(stderr, loc, "strftime format \"%s\" ",
115 format);
116 (void) fputs("yields only two digits of years in ", stderr);
117 if (warn == IN_SOME)
118 (void) fputs("some locales", stderr);
119 else if (warn == IN_THIS)
120 (void) fputs("the current locale", stderr);
121 else (void) fputs("all locales", stderr);
122 (void) fputs("\n", stderr);
123 }
124 #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */
125 if (p == s + maxsize)
126 return 0;
127 *p = '\0';
128 return p - s;
129 }
130
131 size_t
132 strftime(char * __restrict s, size_t maxsize, const char * __restrict format,
133 const struct tm * __restrict t)
134 {
135 return strftime_l(s, maxsize, format, t, __current_locale());
136 }
137
138 #ifndef BUILDING_VARIANT
139 __private_extern__ char *
140 _fmt(format, t, pt, ptlim, warnp, tptr, loc)
141 const char * format;
142 const struct tm * const t;
143 char * pt;
144 const char * const ptlim;
145 int * warnp;
146 struct lc_time_T * tptr;
147 locale_t loc;
148 {
149 int Ealternative, Oalternative, PadIndex;
150
151 for ( ; *format; ++format) {
152 if (*format == '%') {
153 Ealternative = 0;
154 Oalternative = 0;
155 PadIndex = PAD_DEFAULT;
156 label:
157 switch (*++format) {
158 case '\0':
159 --format;
160 break;
161 case 'A':
162 pt = _add((t->tm_wday < 0 ||
163 t->tm_wday >= DAYSPERWEEK) ?
164 "?" : tptr->weekday[t->tm_wday],
165 pt, ptlim);
166 continue;
167 case 'a':
168 pt = _add((t->tm_wday < 0 ||
169 t->tm_wday >= DAYSPERWEEK) ?
170 "?" : tptr->wday[t->tm_wday],
171 pt, ptlim);
172 continue;
173 case 'B':
174 pt = _add((t->tm_mon < 0 ||
175 t->tm_mon >= MONSPERYEAR) ?
176 "?" : (Oalternative ? tptr->alt_month :
177 tptr->month)[t->tm_mon],
178 pt, ptlim);
179 continue;
180 case 'b':
181 case 'h':
182 pt = _add((t->tm_mon < 0 ||
183 t->tm_mon >= MONSPERYEAR) ?
184 "?" : tptr->mon[t->tm_mon],
185 pt, ptlim);
186 continue;
187 case 'C':
188 /*
189 ** %C used to do a...
190 ** _fmt("%a %b %e %X %Y", t, tptr, loc);
191 ** ...whereas now POSIX 1003.2 calls for
192 ** something completely different.
193 ** (ado, 1993-05-24)
194 */
195 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0,
196 pt, ptlim, loc);
197 continue;
198 case 'c':
199 {
200 int warn2 = IN_SOME;
201
202 pt = _fmt(tptr->c_fmt, t, pt, ptlim, &warn2, tptr, loc);
203 if (warn2 == IN_ALL)
204 warn2 = IN_THIS;
205 if (warn2 > *warnp)
206 *warnp = warn2;
207 }
208 continue;
209 case 'D':
210 pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp, tptr, loc);
211 continue;
212 case 'd':
213 pt = _conv(t->tm_mday, fmt_padding[PAD_FMT_DAYOFMONTH][PadIndex],
214 pt, ptlim, loc);
215 continue;
216 case 'E':
217 if (Ealternative || Oalternative)
218 break;
219 Ealternative++;
220 goto label;
221 case 'O':
222 /*
223 ** C99 locale modifiers.
224 ** The sequences
225 ** %Ec %EC %Ex %EX %Ey %EY
226 ** %Od %oe %OH %OI %Om %OM
227 ** %OS %Ou %OU %OV %Ow %OW %Oy
228 ** are supposed to provide alternate
229 ** representations.
230 **
231 ** FreeBSD extension
232 ** %OB
233 */
234 if (Ealternative || Oalternative)
235 break;
236 Oalternative++;
237 goto label;
238 case 'e':
239 pt = _conv(t->tm_mday,
240 fmt_padding[PAD_FMT_SDAYOFMONTH][PadIndex], pt, ptlim, loc);
241 continue;
242 case 'F':
243 pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp, tptr, loc);
244 continue;
245 case 'H':
246 pt = _conv(t->tm_hour, fmt_padding[PAD_FMT_HMS][PadIndex],
247 pt, ptlim, loc);
248 continue;
249 case 'I':
250 pt = _conv((t->tm_hour % 12) ?
251 (t->tm_hour % 12) : 12,
252 fmt_padding[PAD_FMT_HMS][PadIndex], pt, ptlim, loc);
253 continue;
254 case 'j':
255 pt = _conv(t->tm_yday + 1,
256 fmt_padding[PAD_FMT_DAYOFYEAR][PadIndex], pt, ptlim, loc);
257 continue;
258 case 'k':
259 /*
260 ** This used to be...
261 ** _conv(t->tm_hour % 12 ?
262 ** t->tm_hour % 12 : 12, 2, ' ', loc);
263 ** ...and has been changed to the below to
264 ** match SunOS 4.1.1 and Arnold Robbins'
265 ** strftime version 3.0. That is, "%k" and
266 ** "%l" have been swapped.
267 ** (ado, 1993-05-24)
268 */
269 pt = _conv(t->tm_hour, fmt_padding[PAD_FMT_SHMS][PadIndex],
270 pt, ptlim, loc);
271 continue;
272 #ifdef KITCHEN_SINK
273 case 'K':
274 /*
275 ** After all this time, still unclaimed!
276 */
277 pt = _add("kitchen sink", pt, ptlim);
278 continue;
279 #endif /* defined KITCHEN_SINK */
280 case 'l':
281 /*
282 ** This used to be...
283 ** _conv(t->tm_hour, 2, ' ');
284 ** ...and has been changed to the below to
285 ** match SunOS 4.1.1 and Arnold Robbin's
286 ** strftime version 3.0. That is, "%k" and
287 ** "%l" have been swapped.
288 ** (ado, 1993-05-24)
289 */
290 pt = _conv((t->tm_hour % 12) ?
291 (t->tm_hour % 12) : 12,
292 fmt_padding[PAD_FMT_SHMS][PadIndex], pt, ptlim, loc);
293 continue;
294 case 'M':
295 pt = _conv(t->tm_min, fmt_padding[PAD_FMT_HMS][PadIndex],
296 pt, ptlim, loc);
297 continue;
298 case 'm':
299 pt = _conv(t->tm_mon + 1,
300 fmt_padding[PAD_FMT_MONTH][PadIndex], pt, ptlim, loc);
301 continue;
302 case 'n':
303 pt = _add("\n", pt, ptlim);
304 continue;
305 case 'p':
306 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
307 tptr->pm :
308 tptr->am,
309 pt, ptlim);
310 continue;
311 case 'R':
312 pt = _fmt("%H:%M", t, pt, ptlim, warnp, tptr, loc);
313 continue;
314 case 'r':
315 pt = _fmt(tptr->ampm_fmt, t, pt, ptlim,
316 warnp, tptr, loc);
317 continue;
318 case 'S':
319 pt = _conv(t->tm_sec, fmt_padding[PAD_FMT_HMS][PadIndex],
320 pt, ptlim, loc);
321 continue;
322 case 's':
323 {
324 struct tm tm;
325 char buf[INT_STRLEN_MAXIMUM(
326 time_t) + 1];
327 time_t mkt;
328
329 tm = *t;
330 mkt = mktime(&tm);
331 if (TYPE_SIGNED(time_t))
332 (void) sprintf_l(buf, loc, "%ld",
333 (long) mkt);
334 else (void) sprintf_l(buf, loc, "%lu",
335 (unsigned long) mkt);
336 pt = _add(buf, pt, ptlim);
337 }
338 continue;
339 case 'T':
340 pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp, tptr, loc);
341 continue;
342 case 't':
343 pt = _add("\t", pt, ptlim);
344 continue;
345 case 'U':
346 pt = _conv((t->tm_yday + DAYSPERWEEK -
347 t->tm_wday) / DAYSPERWEEK,
348 fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], pt, ptlim, loc);
349 continue;
350 case 'u':
351 /*
352 ** From Arnold Robbins' strftime version 3.0:
353 ** "ISO 8601: Weekday as a decimal number
354 ** [1 (Monday) - 7]"
355 ** (ado, 1993-05-24)
356 */
357 pt = _conv((t->tm_wday == 0) ?
358 DAYSPERWEEK : t->tm_wday,
359 "%d", pt, ptlim, loc);
360 continue;
361 case 'V': /* ISO 8601 week number */
362 case 'G': /* ISO 8601 year (four digits) */
363 case 'g': /* ISO 8601 year (two digits) */
364 /*
365 ** From Arnold Robbins' strftime version 3.0: "the week number of the
366 ** year (the first Monday as the first day of week 1) as a decimal number
367 ** (01-53)."
368 ** (ado, 1993-05-24)
369 **
370 ** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
371 ** "Week 01 of a year is per definition the first week which has the
372 ** Thursday in this year, which is equivalent to the week which contains
373 ** the fourth day of January. In other words, the first week of a new year
374 ** is the week which has the majority of its days in the new year. Week 01
375 ** might also contain days from the previous year and the week before week
376 ** 01 of a year is the last week (52 or 53) of the previous year even if
377 ** it contains days from the new year. A week starts with Monday (day 1)
378 ** and ends with Sunday (day 7). For example, the first week of the year
379 ** 1997 lasts from 1996-12-30 to 1997-01-05..."
380 ** (ado, 1996-01-02)
381 */
382 {
383 int year;
384 int base;
385 int yday;
386 int wday;
387 int w;
388
389 year = t->tm_year;
390 base = TM_YEAR_BASE;
391 yday = t->tm_yday;
392 wday = t->tm_wday;
393 for ( ; ; ) {
394 int len;
395 int bot;
396 int top;
397
398 len = isleap_sum(year, base) ?
399 DAYSPERLYEAR :
400 DAYSPERNYEAR;
401 /*
402 ** What yday (-3 ... 3) does
403 ** the ISO year begin on?
404 */
405 bot = ((yday + 11 - wday) %
406 DAYSPERWEEK) - 3;
407 /*
408 ** What yday does the NEXT
409 ** ISO year begin on?
410 */
411 top = bot -
412 (len % DAYSPERWEEK);
413 if (top < -3)
414 top += DAYSPERWEEK;
415 top += len;
416 if (yday >= top) {
417 ++base;
418 w = 1;
419 break;
420 }
421 if (yday >= bot) {
422 w = 1 + ((yday - bot) /
423 DAYSPERWEEK);
424 break;
425 }
426 --base;
427 yday += isleap_sum(year, base) ?
428 DAYSPERLYEAR :
429 DAYSPERNYEAR;
430 }
431 #ifdef XPG4_1994_04_09
432 if ((w == 52 &&
433 t->tm_mon == TM_JANUARY) ||
434 (w == 1 &&
435 t->tm_mon == TM_DECEMBER))
436 w = 53;
437 #endif /* defined XPG4_1994_04_09 */
438 if (*format == 'V')
439 pt = _conv(w, fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex],
440 pt, ptlim, loc);
441 else if (*format == 'g') {
442 *warnp = IN_ALL;
443 pt = _yconv(year, base, 0, 1,
444 pt, ptlim, loc);
445 } else pt = _yconv(year, base, 1, 1,
446 pt, ptlim, loc);
447 }
448 continue;
449 case 'v':
450 /*
451 ** From Arnold Robbins' strftime version 3.0:
452 ** "date as dd-bbb-YYYY"
453 ** (ado, 1993-05-24)
454 */
455 pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp, tptr, loc);
456 continue;
457 case 'W':
458 pt = _conv((t->tm_yday + DAYSPERWEEK -
459 (t->tm_wday ?
460 (t->tm_wday - 1) :
461 (DAYSPERWEEK - 1))) / DAYSPERWEEK,
462 fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], pt, ptlim, loc);
463 continue;
464 case 'w':
465 pt = _conv(t->tm_wday, "%d", pt, ptlim, loc);
466 continue;
467 case 'X':
468 pt = _fmt(tptr->X_fmt, t, pt, ptlim, warnp, tptr, loc);
469 continue;
470 case 'x':
471 {
472 int warn2 = IN_SOME;
473
474 pt = _fmt(tptr->x_fmt, t, pt, ptlim, &warn2, tptr, loc);
475 if (warn2 == IN_ALL)
476 warn2 = IN_THIS;
477 if (warn2 > *warnp)
478 *warnp = warn2;
479 }
480 continue;
481 case 'y':
482 *warnp = IN_ALL;
483 pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1,
484 pt, ptlim, loc);
485 continue;
486 case 'Y':
487 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1,
488 pt, ptlim, loc);
489 continue;
490 case 'Z':
491 #ifdef TM_ZONE
492 if (t->TM_ZONE != NULL)
493 pt = _add(t->TM_ZONE, pt, ptlim);
494 else
495 #endif /* defined TM_ZONE */
496 if (t->tm_isdst >= 0)
497 pt = _add(tzname[t->tm_isdst != 0],
498 pt, ptlim);
499 /*
500 ** C99 says that %Z must be replaced by the
501 ** empty string if the time zone is not
502 ** determinable.
503 */
504 continue;
505 case 'z':
506 {
507 int diff;
508 char const * sign;
509
510 if (t->tm_isdst < 0)
511 continue;
512 #if defined(TM_GMTOFF) && !__DARWIN_UNIX03
513 diff = t->TM_GMTOFF;
514 #else /* !defined TM_GMTOFF || __DARWIN_UNIX03 */
515 /*
516 ** C99 says that the UTC offset must
517 ** be computed by looking only at
518 ** tm_isdst. This requirement is
519 ** incorrect, since it means the code
520 ** must rely on magic (in this case
521 ** altzone and timezone), and the
522 ** magic might not have the correct
523 ** offset. Doing things correctly is
524 ** tricky and requires disobeying C99;
525 ** see GNU C strftime for details.
526 ** For now, punt and conform to the
527 ** standard, even though it's incorrect.
528 **
529 ** C99 says that %z must be replaced by the
530 ** empty string if the time zone is not
531 ** determinable, so output nothing if the
532 ** appropriate variables are not available.
533 */
534 if (t->tm_isdst == 0)
535 #ifdef USG_COMPAT
536 diff = -_st_get_timezone();
537 #else /* !defined USG_COMPAT */
538 continue;
539 #endif /* !defined USG_COMPAT */
540 else
541 #ifdef ALTZONE
542 diff = -altzone;
543 #else /* !defined ALTZONE */
544 continue;
545 #endif /* !defined ALTZONE */
546 #endif /* !defined TM_GMTOFF || __DARWIN_UNIX03 */
547 if (diff < 0) {
548 sign = "-";
549 diff = -diff;
550 } else sign = "+";
551 pt = _add(sign, pt, ptlim);
552 diff /= SECSPERMIN;
553 diff = (diff / MINSPERHOUR) * 100 +
554 (diff % MINSPERHOUR);
555 pt = _conv(diff,
556 fmt_padding[PAD_FMT_YEAR][PadIndex], pt, ptlim, loc);
557 }
558 continue;
559 case '+':
560 pt = _fmt(tptr->date_fmt, t, pt, ptlim,
561 warnp, tptr, loc);
562 continue;
563 case '-':
564 if (PadIndex != PAD_DEFAULT)
565 break;
566 PadIndex = PAD_LESS;
567 goto label;
568 case '_':
569 if (PadIndex != PAD_DEFAULT)
570 break;
571 PadIndex = PAD_SPACE;
572 goto label;
573 case '0':
574 if (PadIndex != PAD_DEFAULT)
575 break;
576 PadIndex = PAD_ZERO;
577 goto label;
578 case '%':
579 /*
580 ** X311J/88-090 (4.12.3.5): if conversion char is
581 ** undefined, behavior is undefined. Print out the
582 ** character itself as printf(3) also does.
583 */
584 default:
585 break;
586 }
587 }
588 if (pt == ptlim)
589 break;
590 *pt++ = *format;
591 }
592 return pt;
593 }
594
595 static char *
596 _conv(n, format, pt, ptlim, loc)
597 const int n;
598 const char * const format;
599 char * const pt;
600 const char * const ptlim;
601 locale_t loc;
602 {
603 char buf[INT_STRLEN_MAXIMUM(int) + 1];
604
605 (void) sprintf_l(buf, loc, format, n);
606 return _add(buf, pt, ptlim);
607 }
608
609 static char *
610 _add(str, pt, ptlim)
611 const char * str;
612 char * pt;
613 const char * const ptlim;
614 {
615 while (pt < ptlim && (*pt = *str++) != '\0')
616 ++pt;
617 return pt;
618 }
619
620 /*
621 ** POSIX and the C Standard are unclear or inconsistent about
622 ** what %C and %y do if the year is negative or exceeds 9999.
623 ** Use the convention that %C concatenated with %y yields the
624 ** same output as %Y, and that %Y contains at least 4 bytes,
625 ** with more only if necessary.
626 */
627
628 static char *
629 _yconv(a, b, convert_top, convert_yy, pt, ptlim, loc)
630 const int a;
631 const int b;
632 const int convert_top;
633 const int convert_yy;
634 char * pt;
635 const char * const ptlim;
636 locale_t loc;
637 {
638 register int lead;
639 register int trail;
640
641 #define DIVISOR 100
642 trail = a % DIVISOR + b % DIVISOR;
643 lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
644 trail %= DIVISOR;
645 if (trail < 0 && lead > 0) {
646 trail += DIVISOR;
647 --lead;
648 } else if (lead < 0 && trail > 0) {
649 trail -= DIVISOR;
650 ++lead;
651 }
652 if (convert_top) {
653 if (lead == 0 && trail < 0)
654 pt = _add("-0", pt, ptlim);
655 else pt = _conv(lead, "%02d", pt, ptlim, loc);
656 }
657 if (convert_yy)
658 pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim, loc);
659 return pt;
660 }
661 #endif /* !BUILDING_VARIANT */
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