2 * Copyright (c) 1989 The Regents of the University of California.
5 * Copyright (c) 2011 The FreeBSD Foundation
7 * Portions of this software were developed by David Chisnall
8 * under sponsorship from the FreeBSD Foundation.
10 * Redistribution and use in source and binary forms are permitted
11 * provided that the above copyright notice and this paragraph are
12 * duplicated in all such forms and that any documentation,
13 * advertising materials, and other materials related to such
14 * distribution and use acknowledge that the software was developed
15 * by the University of California, Berkeley. The name of the
16 * University may not be used to endorse or promote products derived
17 * from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
25 static const char elsieid[] = "@(#)strftime.3 8.3";
27 * Based on the UCB version with the ID appearing below.
28 * This is ANSIish only when "multibyte character == plain character".
30 #endif /* !defined NOID */
31 #endif /* !defined lint */
33 #include "namespace.h"
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89";
38 #endif /* LIBC_SCCS and not lint */
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
45 #include "un-namespace.h"
46 #include "timelocal.h"
48 static char * _add(const char *, char *, const char *);
49 static char * _conv(int, const char *, char *, const char *, locale_t);
50 static char * _fmt(const char *, const struct tm *, char *, const char *,
52 static char * _yconv(int, int, int, int, char *, const char *, locale_t);
54 extern char * tzname[];
56 #ifndef YEAR_2000_NAME
57 #define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS"
58 #endif /* !defined YEAR_2000_NAME */
70 static const char fmt_padding[][4][5] = {
71 /* DEFAULT, LESS, SPACE, ZERO */
72 #define PAD_FMT_MONTHDAY 0
74 #define PAD_FMT_CENTURY 0
75 #define PAD_FMT_SHORTYEAR 0
76 #define PAD_FMT_MONTH 0
77 #define PAD_FMT_WEEKOFYEAR 0
78 #define PAD_FMT_DAYOFMONTH 0
79 { "%02d", "%d", "%2d", "%02d" },
80 #define PAD_FMT_SDAYOFMONTH 1
81 #define PAD_FMT_SHMS 1
82 { "%2d", "%d", "%2d", "%02d" },
83 #define PAD_FMT_DAYOFYEAR 2
84 { "%03d", "%d", "%3d", "%03d" },
85 #define PAD_FMT_YEAR 3
86 { "%04d", "%d", "%4d", "%04d" }
90 strftime_l(char * __restrict s, size_t maxsize, const char * __restrict format,
91 const struct tm * __restrict t, locale_t loc)
99 p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn, loc);
100 #ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
101 if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) {
102 (void) fprintf_l(stderr, loc, "\n");
104 (void) fputs("NULL strftime format ", stderr);
105 else (void) fprintf_l(stderr, loc, "strftime format \"%s\" ",
107 (void) fputs("yields only two digits of years in ", stderr);
109 (void) fputs("some locales", stderr);
110 else if (warn == IN_THIS)
111 (void) fputs("the current locale", stderr);
112 else (void) fputs("all locales", stderr);
113 (void) fputs("\n", stderr);
115 #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */
116 if (p == s + maxsize)
123 strftime(char * __restrict s, size_t maxsize, const char * __restrict format,
124 const struct tm * __restrict t)
126 return strftime_l(s, maxsize, format, t, __get_locale());
130 _fmt(const char *format, const struct tm * const t, char *pt,
131 const char * const ptlim, int *warnp, locale_t loc)
133 int Ealternative, Oalternative, PadIndex;
134 struct lc_time_T *tptr = __get_current_time_locale(loc);
136 for ( ; *format; ++format) {
137 if (*format == '%') {
140 PadIndex = PAD_DEFAULT;
147 pt = _add((t->tm_wday < 0 ||
148 t->tm_wday >= DAYSPERWEEK) ?
149 "?" : tptr->weekday[t->tm_wday],
153 pt = _add((t->tm_wday < 0 ||
154 t->tm_wday >= DAYSPERWEEK) ?
155 "?" : tptr->wday[t->tm_wday],
159 pt = _add((t->tm_mon < 0 ||
160 t->tm_mon >= MONSPERYEAR) ?
161 "?" : (Oalternative ? tptr->alt_month :
162 tptr->month)[t->tm_mon],
167 pt = _add((t->tm_mon < 0 ||
168 t->tm_mon >= MONSPERYEAR) ?
169 "?" : tptr->mon[t->tm_mon],
175 * _fmt("%a %b %e %X %Y", t);
176 * ...whereas now POSIX 1003.2 calls for
177 * something completely different.
180 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0,
187 pt = _fmt(tptr->c_fmt, t, pt, ptlim, &warn2, loc);
195 pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp, loc);
198 pt = _conv(t->tm_mday,
199 fmt_padding[PAD_FMT_DAYOFMONTH][PadIndex],
203 if (Ealternative || Oalternative)
209 * C99 locale modifiers.
211 * %Ec %EC %Ex %EX %Ey %EY
212 * %Od %oe %OH %OI %Om %OM
213 * %OS %Ou %OU %OV %Ow %OW %Oy
214 * are supposed to provide alternate
220 if (Ealternative || Oalternative)
225 pt = _conv(t->tm_mday,
226 fmt_padding[PAD_FMT_SDAYOFMONTH][PadIndex],
230 pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp, loc);
233 pt = _conv(t->tm_hour, fmt_padding[PAD_FMT_HMS][PadIndex],
237 pt = _conv((t->tm_hour % 12) ?
238 (t->tm_hour % 12) : 12,
239 fmt_padding[PAD_FMT_HMS][PadIndex],
243 pt = _conv(t->tm_yday + 1,
244 fmt_padding[PAD_FMT_DAYOFYEAR][PadIndex],
250 * _conv(t->tm_hour % 12 ?
251 * t->tm_hour % 12 : 12, 2, ' ');
252 * ...and has been changed to the below to
253 * match SunOS 4.1.1 and Arnold Robbins'
254 * strftime version 3.0. That is, "%k" and
255 * "%l" have been swapped.
258 pt = _conv(t->tm_hour, fmt_padding[PAD_FMT_SHMS][PadIndex],
264 ** After all this time, still unclaimed!
266 pt = _add("kitchen sink", pt, ptlim);
268 #endif /* defined KITCHEN_SINK */
272 * _conv(t->tm_hour, 2, ' ');
273 * ...and has been changed to the below to
274 * match SunOS 4.1.1 and Arnold Robbin's
275 * strftime version 3.0. That is, "%k" and
276 * "%l" have been swapped.
279 pt = _conv((t->tm_hour % 12) ?
280 (t->tm_hour % 12) : 12,
281 fmt_padding[PAD_FMT_SHMS][PadIndex],
285 pt = _conv(t->tm_min, fmt_padding[PAD_FMT_HMS][PadIndex],
289 pt = _conv(t->tm_mon + 1,
290 fmt_padding[PAD_FMT_MONTH][PadIndex],
294 pt = _add("\n", pt, ptlim);
297 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
302 pt = _fmt("%H:%M", t, pt, ptlim, warnp, loc);
305 pt = _fmt(tptr->ampm_fmt, t, pt, ptlim,
309 pt = _conv(t->tm_sec, fmt_padding[PAD_FMT_HMS][PadIndex],
315 char buf[INT_STRLEN_MAXIMUM(
321 if (TYPE_SIGNED(time_t))
322 (void) sprintf_l(buf, loc, "%ld",
324 else (void) sprintf_l(buf, loc, "%lu",
325 (unsigned long) mkt);
326 pt = _add(buf, pt, ptlim);
330 pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp, loc);
333 pt = _add("\t", pt, ptlim);
336 pt = _conv((t->tm_yday + DAYSPERWEEK -
337 t->tm_wday) / DAYSPERWEEK,
338 fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex],
343 * From Arnold Robbins' strftime version 3.0:
344 * "ISO 8601: Weekday as a decimal number
348 pt = _conv((t->tm_wday == 0) ?
349 DAYSPERWEEK : t->tm_wday,
350 "%d", pt, ptlim, loc);
352 case 'V': /* ISO 8601 week number */
353 case 'G': /* ISO 8601 year (four digits) */
354 case 'g': /* ISO 8601 year (two digits) */
356 * From Arnold Robbins' strftime version 3.0: "the week number of the
357 * year (the first Monday as the first day of week 1) as a decimal number
361 * From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
362 * "Week 01 of a year is per definition the first week which has the
363 * Thursday in this year, which is equivalent to the week which contains
364 * the fourth day of January. In other words, the first week of a new year
365 * is the week which has the majority of its days in the new year. Week 01
366 * might also contain days from the previous year and the week before week
367 * 01 of a year is the last week (52 or 53) of the previous year even if
368 * it contains days from the new year. A week starts with Monday (day 1)
369 * and ends with Sunday (day 7). For example, the first week of the year
370 * 1997 lasts from 1996-12-30 to 1997-01-05..."
389 len = isleap_sum(year, base) ?
393 * What yday (-3 ... 3) does
394 * the ISO year begin on?
396 bot = ((yday + 11 - wday) %
399 * What yday does the NEXT
413 w = 1 + ((yday - bot) /
418 yday += isleap_sum(year, base) ?
422 #ifdef XPG4_1994_04_09
424 t->tm_mon == TM_JANUARY) ||
426 t->tm_mon == TM_DECEMBER))
428 #endif /* defined XPG4_1994_04_09 */
430 pt = _conv(w, fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex],
432 else if (*format == 'g') {
434 pt = _yconv(year, base, 0, 1,
436 } else pt = _yconv(year, base, 1, 1,
442 * From Arnold Robbins' strftime version 3.0:
443 * "date as dd-bbb-YYYY"
446 pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp, loc);
449 pt = _conv((t->tm_yday + DAYSPERWEEK -
452 (DAYSPERWEEK - 1))) / DAYSPERWEEK,
453 fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex],
457 pt = _conv(t->tm_wday, "%d", pt, ptlim, loc);
460 pt = _fmt(tptr->X_fmt, t, pt, ptlim, warnp, loc);
466 pt = _fmt(tptr->x_fmt, t, pt, ptlim, &warn2, loc);
475 pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1,
479 pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1,
484 if (t->TM_ZONE != NULL)
485 pt = _add(t->TM_ZONE, pt, ptlim);
487 #endif /* defined TM_ZONE */
488 if (t->tm_isdst >= 0)
489 pt = _add(tzname[t->tm_isdst != 0],
492 * C99 says that %Z must be replaced by the
493 * empty string if the time zone is not
506 #else /* !defined TM_GMTOFF */
508 * C99 says that the UTC offset must
509 * be computed by looking only at
510 * tm_isdst. This requirement is
511 * incorrect, since it means the code
512 * must rely on magic (in this case
513 * altzone and timezone), and the
514 * magic might not have the correct
515 * offset. Doing things correctly is
516 * tricky and requires disobeying C99;
517 * see GNU C strftime for details.
518 * For now, punt and conform to the
519 * standard, even though it's incorrect.
521 * C99 says that %z must be replaced by the
522 * empty string if the time zone is not
523 * determinable, so output nothing if the
524 * appropriate variables are not available.
526 if (t->tm_isdst == 0)
529 #else /* !defined USG_COMPAT */
531 #endif /* !defined USG_COMPAT */
535 #else /* !defined ALTZONE */
537 #endif /* !defined ALTZONE */
538 #endif /* !defined TM_GMTOFF */
544 pt = _add(sign, pt, ptlim);
546 diff = (diff / MINSPERHOUR) * 100 +
547 (diff % MINSPERHOUR);
549 fmt_padding[PAD_FMT_YEAR][PadIndex],
554 pt = _fmt(tptr->date_fmt, t, pt, ptlim,
558 if (PadIndex != PAD_DEFAULT)
563 if (PadIndex != PAD_DEFAULT)
565 PadIndex = PAD_SPACE;
568 if (PadIndex != PAD_DEFAULT)
574 * X311J/88-090 (4.12.3.5): if conversion char is
575 * undefined, behavior is undefined. Print out the
576 * character itself as printf(3) also does.
590 _conv(const int n, const char * const format, char * const pt,
591 const char * const ptlim, locale_t loc)
593 char buf[INT_STRLEN_MAXIMUM(int) + 1];
595 (void) sprintf_l(buf, loc, format, n);
596 return _add(buf, pt, ptlim);
600 _add(const char *str, char *pt, const char * const ptlim)
602 while (pt < ptlim && (*pt = *str++) != '\0')
608 * POSIX and the C Standard are unclear or inconsistent about
609 * what %C and %y do if the year is negative or exceeds 9999.
610 * Use the convention that %C concatenated with %y yields the
611 * same output as %Y, and that %Y contains at least 4 bytes,
612 * with more only if necessary.
616 _yconv(const int a, const int b, const int convert_top, const int convert_yy,
617 char *pt, const char * const ptlim, locale_t loc)
623 trail = a % DIVISOR + b % DIVISOR;
624 lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
626 if (trail < 0 && lead > 0) {
629 } else if (lead < 0 && trail > 0) {
634 if (lead == 0 && trail < 0)
635 pt = _add("-0", pt, ptlim);
636 else pt = _conv(lead, "%02d", pt, ptlim, loc);
639 pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt,