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[apple/libc.git] / stdtime / strftime-fbsd.c
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.c 7.64";
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 1.40 2004/06/14 10:31:52 stefanf 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 #endif /* !BUILDING_VARIANT */
50 #define _fmt _st_fmt
51 __private_extern__ char *_fmt(const char *, const struct tm *, char *, const char *, int *, struct lc_time_T *, locale_t);
52
53 size_t strftime(char * __restrict, size_t, const char * __restrict,
54 const struct tm * __restrict);
55
56 extern char * tzname[];
57 __private_extern__ long __darwin_altzone; /* DST timezone offset */
58 #define altzone __darwin_altzone
59 __private_extern__ long _st_get_timezone(void);
60
61 #ifndef YEAR_2000_NAME
62 #define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS"
63 #endif /* !defined YEAR_2000_NAME */
64
65
66 #define IN_NONE 0
67 #define IN_SOME 1
68 #define IN_THIS 2
69 #define IN_ALL 3
70
71 size_t
72 strftime_l(char * __restrict s, size_t maxsize, const char * __restrict format,
73 const struct tm * __restrict t, locale_t loc)
74 {
75 char * p;
76 int warn;
77 #if __DARWIN_UNIX03
78 struct tm t2;
79 #endif /* __DARWIN_UNIX03 */
80
81 NORMALIZE_LOCALE(loc);
82 tzset();
83 warn = IN_NONE;
84 #if __DARWIN_UNIX03
85 if (t->tm_isdst >= 0) {
86 t2 = *t;
87 t2.tm_gmtoff = t->tm_isdst ? -__darwin_altzone : -_st_get_timezone();
88 t = &t2;
89 }
90 #endif /* __DARWIN_UNIX03 */
91 p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn, __get_current_time_locale(loc), loc);
92 #ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
93 if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) {
94 (void) fputs("\n", stderr);
95 if (format == NULL)
96 (void) fputs("NULL strftime format ", stderr);
97 else (void) fprintf_l(stderr, loc, "strftime format \"%s\" ",
98 format);
99 (void) fputs("yields only two digits of years in ", stderr);
100 if (warn == IN_SOME)
101 (void) fputs("some locales", stderr);
102 else if (warn == IN_THIS)
103 (void) fputs("the current locale", stderr);
104 else (void) fputs("all locales", stderr);
105 (void) fputs("\n", stderr);
106 }
107 #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */
108 if (p == s + maxsize)
109 return 0;
110 *p = '\0';
111 return p - s;
112 }
113
114 size_t
115 strftime(char * __restrict s, size_t maxsize, const char * __restrict format,
116 const struct tm * __restrict t)
117 {
118 return strftime_l(s, maxsize, format, t, __current_locale());
119 }
120
121 #ifndef BUILDING_VARIANT
122 __private_extern__ char *
123 _fmt(format, t, pt, ptlim, warnp, tptr, loc)
124 const char * format;
125 const struct tm * const t;
126 char * pt;
127 const char * const ptlim;
128 int * warnp;
129 struct lc_time_T * tptr;
130 locale_t loc;
131 {
132 int Ealternative, Oalternative;
133
134 for ( ; *format; ++format) {
135 if (*format == '%') {
136 Ealternative = 0;
137 Oalternative = 0;
138 label:
139 switch (*++format) {
140 case '\0':
141 --format;
142 break;
143 case 'A':
144 pt = _add((t->tm_wday < 0 ||
145 t->tm_wday >= DAYSPERWEEK) ?
146 "?" : tptr->weekday[t->tm_wday],
147 pt, ptlim);
148 continue;
149 case 'a':
150 pt = _add((t->tm_wday < 0 ||
151 t->tm_wday >= DAYSPERWEEK) ?
152 "?" : tptr->wday[t->tm_wday],
153 pt, ptlim);
154 continue;
155 case 'B':
156 pt = _add((t->tm_mon < 0 ||
157 t->tm_mon >= MONSPERYEAR) ?
158 "?" : (Oalternative ? tptr->alt_month :
159 tptr->month)[t->tm_mon],
160 pt, ptlim);
161 continue;
162 case 'b':
163 case 'h':
164 pt = _add((t->tm_mon < 0 ||
165 t->tm_mon >= MONSPERYEAR) ?
166 "?" : tptr->mon[t->tm_mon],
167 pt, ptlim);
168 continue;
169 case 'C':
170 /*
171 ** %C used to do a...
172 ** _fmt("%a %b %e %X %Y", t);
173 ** ...whereas now POSIX 1003.2 calls for
174 ** something completely different.
175 ** (ado, 1993-05-24)
176 */
177 pt = _conv((t->tm_year + TM_YEAR_BASE) / 100,
178 "%02d", pt, ptlim, loc);
179 continue;
180 case 'c':
181 {
182 int warn2 = IN_SOME;
183
184 pt = _fmt(tptr->c_fmt, t, pt, ptlim, warnp, tptr, loc);
185 if (warn2 == IN_ALL)
186 warn2 = IN_THIS;
187 if (warn2 > *warnp)
188 *warnp = warn2;
189 }
190 continue;
191 case 'D':
192 pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp, tptr, loc);
193 continue;
194 case 'd':
195 pt = _conv(t->tm_mday, "%02d", pt, ptlim, loc);
196 continue;
197 case 'E':
198 if (Ealternative || Oalternative)
199 break;
200 Ealternative++;
201 goto label;
202 case 'O':
203 /*
204 ** C99 locale modifiers.
205 ** The sequences
206 ** %Ec %EC %Ex %EX %Ey %EY
207 ** %Od %oe %OH %OI %Om %OM
208 ** %OS %Ou %OU %OV %Ow %OW %Oy
209 ** are supposed to provide alternate
210 ** representations.
211 **
212 ** FreeBSD extension
213 ** %OB
214 */
215 if (Ealternative || Oalternative)
216 break;
217 Oalternative++;
218 goto label;
219 case 'e':
220 pt = _conv(t->tm_mday, "%2d", pt, ptlim, loc);
221 continue;
222 case 'F':
223 pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp, tptr, loc);
224 continue;
225 case 'H':
226 pt = _conv(t->tm_hour, "%02d", pt, ptlim, loc);
227 continue;
228 case 'I':
229 pt = _conv((t->tm_hour % 12) ?
230 (t->tm_hour % 12) : 12,
231 "%02d", pt, ptlim, loc);
232 continue;
233 case 'j':
234 pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim, loc);
235 continue;
236 case 'k':
237 /*
238 ** This used to be...
239 ** _conv(t->tm_hour % 12 ?
240 ** t->tm_hour % 12 : 12, 2, ' ');
241 ** ...and has been changed to the below to
242 ** match SunOS 4.1.1 and Arnold Robbins'
243 ** strftime version 3.0. That is, "%k" and
244 ** "%l" have been swapped.
245 ** (ado, 1993-05-24)
246 */
247 pt = _conv(t->tm_hour, "%2d", pt, ptlim, loc);
248 continue;
249 #ifdef KITCHEN_SINK
250 case 'K':
251 /*
252 ** After all this time, still unclaimed!
253 */
254 pt = _add("kitchen sink", pt, ptlim);
255 continue;
256 #endif /* defined KITCHEN_SINK */
257 case 'l':
258 /*
259 ** This used to be...
260 ** _conv(t->tm_hour, 2, ' ');
261 ** ...and has been changed to the below to
262 ** match SunOS 4.1.1 and Arnold Robbin's
263 ** strftime version 3.0. That is, "%k" and
264 ** "%l" have been swapped.
265 ** (ado, 1993-05-24)
266 */
267 pt = _conv((t->tm_hour % 12) ?
268 (t->tm_hour % 12) : 12,
269 "%2d", pt, ptlim, loc);
270 continue;
271 case 'M':
272 pt = _conv(t->tm_min, "%02d", pt, ptlim, loc);
273 continue;
274 case 'm':
275 pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim, loc);
276 continue;
277 case 'n':
278 pt = _add("\n", pt, ptlim);
279 continue;
280 case 'p':
281 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
282 tptr->pm :
283 tptr->am,
284 pt, ptlim);
285 continue;
286 case 'R':
287 pt = _fmt("%H:%M", t, pt, ptlim, warnp, tptr, loc);
288 continue;
289 case 'r':
290 pt = _fmt(tptr->ampm_fmt, t, pt, ptlim,
291 warnp, tptr, loc);
292 continue;
293 case 'S':
294 pt = _conv(t->tm_sec, "%02d", pt, ptlim, loc);
295 continue;
296 case 's':
297 {
298 struct tm tm;
299 char buf[INT_STRLEN_MAXIMUM(
300 time_t) + 1];
301 time_t mkt;
302
303 tm = *t;
304 mkt = mktime(&tm);
305 if (TYPE_SIGNED(time_t))
306 (void) sprintf_l(buf, loc, "%ld",
307 (long) mkt);
308 else (void) sprintf_l(buf, loc, "%lu",
309 (unsigned long) mkt);
310 pt = _add(buf, pt, ptlim);
311 }
312 continue;
313 case 'T':
314 pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp, tptr, loc);
315 continue;
316 case 't':
317 pt = _add("\t", pt, ptlim);
318 continue;
319 case 'U':
320 pt = _conv((t->tm_yday + DAYSPERWEEK -
321 t->tm_wday) / DAYSPERWEEK,
322 "%02d", pt, ptlim, loc);
323 continue;
324 case 'u':
325 /*
326 ** From Arnold Robbins' strftime version 3.0:
327 ** "ISO 8601: Weekday as a decimal number
328 ** [1 (Monday) - 7]"
329 ** (ado, 1993-05-24)
330 */
331 pt = _conv((t->tm_wday == 0) ?
332 DAYSPERWEEK : t->tm_wday,
333 "%d", pt, ptlim, loc);
334 continue;
335 case 'V': /* ISO 8601 week number */
336 case 'G': /* ISO 8601 year (four digits) */
337 case 'g': /* ISO 8601 year (two digits) */
338 /*
339 ** From Arnold Robbins' strftime version 3.0: "the week number of the
340 ** year (the first Monday as the first day of week 1) as a decimal number
341 ** (01-53)."
342 ** (ado, 1993-05-24)
343 **
344 ** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
345 ** "Week 01 of a year is per definition the first week which has the
346 ** Thursday in this year, which is equivalent to the week which contains
347 ** the fourth day of January. In other words, the first week of a new year
348 ** is the week which has the majority of its days in the new year. Week 01
349 ** might also contain days from the previous year and the week before week
350 ** 01 of a year is the last week (52 or 53) of the previous year even if
351 ** it contains days from the new year. A week starts with Monday (day 1)
352 ** and ends with Sunday (day 7). For example, the first week of the year
353 ** 1997 lasts from 1996-12-30 to 1997-01-05..."
354 ** (ado, 1996-01-02)
355 */
356 {
357 int year;
358 int yday;
359 int wday;
360 int w;
361
362 year = t->tm_year + TM_YEAR_BASE;
363 yday = t->tm_yday;
364 wday = t->tm_wday;
365 for ( ; ; ) {
366 int len;
367 int bot;
368 int top;
369
370 len = isleap(year) ?
371 DAYSPERLYEAR :
372 DAYSPERNYEAR;
373 /*
374 ** What yday (-3 ... 3) does
375 ** the ISO year begin on?
376 */
377 bot = ((yday + 11 - wday) %
378 DAYSPERWEEK) - 3;
379 /*
380 ** What yday does the NEXT
381 ** ISO year begin on?
382 */
383 top = bot -
384 (len % DAYSPERWEEK);
385 if (top < -3)
386 top += DAYSPERWEEK;
387 top += len;
388 if (yday >= top) {
389 ++year;
390 w = 1;
391 break;
392 }
393 if (yday >= bot) {
394 w = 1 + ((yday - bot) /
395 DAYSPERWEEK);
396 break;
397 }
398 --year;
399 yday += isleap(year) ?
400 DAYSPERLYEAR :
401 DAYSPERNYEAR;
402 }
403 #ifdef XPG4_1994_04_09
404 if ((w == 52
405 && t->tm_mon == TM_JANUARY)
406 || (w == 1
407 && t->tm_mon == TM_DECEMBER))
408 w = 53;
409 #endif /* defined XPG4_1994_04_09 */
410 if (*format == 'V')
411 pt = _conv(w, "%02d",
412 pt, ptlim, loc);
413 else if (*format == 'g') {
414 *warnp = IN_ALL;
415 pt = _conv(year % 100, "%02d",
416 pt, ptlim, loc);
417 } else pt = _conv(year, "%04d",
418 pt, ptlim, loc);
419 }
420 continue;
421 case 'v':
422 /*
423 ** From Arnold Robbins' strftime version 3.0:
424 ** "date as dd-bbb-YYYY"
425 ** (ado, 1993-05-24)
426 */
427 pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp, tptr, loc);
428 continue;
429 case 'W':
430 pt = _conv((t->tm_yday + DAYSPERWEEK -
431 (t->tm_wday ?
432 (t->tm_wday - 1) :
433 (DAYSPERWEEK - 1))) / DAYSPERWEEK,
434 "%02d", pt, ptlim, loc);
435 continue;
436 case 'w':
437 pt = _conv(t->tm_wday, "%d", pt, ptlim, loc);
438 continue;
439 case 'X':
440 pt = _fmt(tptr->X_fmt, t, pt, ptlim, warnp, tptr, loc);
441 continue;
442 case 'x':
443 {
444 int warn2 = IN_SOME;
445
446 pt = _fmt(tptr->x_fmt, t, pt, ptlim, &warn2, tptr, loc);
447 if (warn2 == IN_ALL)
448 warn2 = IN_THIS;
449 if (warn2 > *warnp)
450 *warnp = warn2;
451 }
452 continue;
453 case 'y':
454 *warnp = IN_ALL;
455 pt = _conv((t->tm_year + TM_YEAR_BASE) % 100,
456 "%02d", pt, ptlim, loc);
457 continue;
458 case 'Y':
459 pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d",
460 pt, ptlim, loc);
461 continue;
462 case 'Z':
463 #ifdef TM_ZONE
464 if (t->TM_ZONE != NULL)
465 pt = _add(t->TM_ZONE, pt, ptlim);
466 else
467 #endif /* defined TM_ZONE */
468 if (t->tm_isdst >= 0)
469 pt = _add(tzname[t->tm_isdst != 0],
470 pt, ptlim);
471 /*
472 ** C99 says that %Z must be replaced by the
473 ** empty string if the time zone is not
474 ** determinable.
475 */
476 continue;
477 case 'z':
478 {
479 int diff;
480 char const * sign;
481
482 if (t->tm_isdst < 0)
483 continue;
484 #ifdef TM_GMTOFF
485 diff = t->TM_GMTOFF;
486 #else /* !defined TM_GMTOFF */
487 /*
488 ** C99 says that the UTC offset must
489 ** be computed by looking only at
490 ** tm_isdst. This requirement is
491 ** incorrect, since it means the code
492 ** must rely on magic (in this case
493 ** altzone and timezone), and the
494 ** magic might not have the correct
495 ** offset. Doing things correctly is
496 ** tricky and requires disobeying C99;
497 ** see GNU C strftime for details.
498 ** For now, punt and conform to the
499 ** standard, even though it's incorrect.
500 **
501 ** C99 says that %z must be replaced by the
502 ** empty string if the time zone is not
503 ** determinable, so output nothing if the
504 ** appropriate variables are not available.
505 */
506 if (t->tm_isdst == 0)
507 #ifdef USG_COMPAT
508 diff = -_st_get_timezone();
509 #else /* !defined USG_COMPAT */
510 continue;
511 #endif /* !defined USG_COMPAT */
512 else
513 #ifdef ALTZONE
514 diff = -altzone;
515 #else /* !defined ALTZONE */
516 continue;
517 #endif /* !defined ALTZONE */
518 #endif /* !defined TM_GMTOFF */
519 if (diff < 0) {
520 sign = "-";
521 diff = -diff;
522 } else sign = "+";
523 pt = _add(sign, pt, ptlim);
524 diff /= 60;
525 pt = _conv((diff/60)*100 + diff%60,
526 "%04d", pt, ptlim, loc);
527 }
528 continue;
529 case '+':
530 pt = _fmt(tptr->date_fmt, t, pt, ptlim,
531 warnp, tptr, loc);
532 continue;
533 case '%':
534 /*
535 ** X311J/88-090 (4.12.3.5): if conversion char is
536 ** undefined, behavior is undefined. Print out the
537 ** character itself as printf(3) also does.
538 */
539 default:
540 break;
541 }
542 }
543 if (pt == ptlim)
544 break;
545 *pt++ = *format;
546 }
547 return pt;
548 }
549
550 static char *
551 _conv(n, format, pt, ptlim, loc)
552 const int n;
553 const char * const format;
554 char * const pt;
555 const char * const ptlim;
556 locale_t loc;
557 {
558 char buf[INT_STRLEN_MAXIMUM(int) + 1];
559
560 (void) sprintf_l(buf, loc, format, n);
561 return _add(buf, pt, ptlim);
562 }
563
564 static char *
565 _add(str, pt, ptlim)
566 const char * str;
567 char * pt;
568 const char * const ptlim;
569 {
570 while (pt < ptlim && (*pt = *str++) != '\0')
571 ++pt;
572 return pt;
573 }
574 #endif /* !BUILDING_VARIANT */
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