Ruby 2.0.0p247(2013-06-27revision41674)

- Main Page
- Modules
- Data Structures
- Files

- File List
- Globals

strftime.c
Go to the documentation of this file.
1 /* -*- c-file-style: "linux" -*- */
2
3 /*
4 * strftime.c
5 *
6 * Public-domain implementation of ANSI C library routine.
7 *
8 * It's written in old-style C for maximal portability.
9 * However, since I'm used to prototypes, I've included them too.
10 *
11 * If you want stuff in the System V ascftime routine, add the SYSV_EXT define.
12 * For extensions from SunOS, add SUNOS_EXT.
13 * For stuff needed to implement the P1003.2 date command, add POSIX2_DATE.
14 * For VMS dates, add VMS_EXT.
15 * For a an RFC822 time format, add MAILHEADER_EXT.
16 * For ISO week years, add ISO_DATE_EXT.
17 * For complete POSIX semantics, add POSIX_SEMANTICS.
18 *
19 * The code for %c, %x, and %X now follows the 1003.2 specification for
20 * the POSIX locale.
21 * This version ignores LOCALE information.
22 * It also doesn't worry about multi-byte characters.
23 * So there.
24 *
25 * This file is also shipped with GAWK (GNU Awk), gawk specific bits of
26 * code are included if GAWK is defined.
27 *
28 * Arnold Robbins
29 * January, February, March, 1991
30 * Updated March, April 1992
31 * Updated April, 1993
32 * Updated February, 1994
33 * Updated May, 1994
34 * Updated January, 1995
35 * Updated September, 1995
36 * Updated January, 1996
37 *
38 * Fixes from ado@elsie.nci.nih.gov
39 * February 1991, May 1992
40 * Fixes from Tor Lillqvist tml@tik.vtt.fi
41 * May, 1993
42 * Further fixes from ado@elsie.nci.nih.gov
43 * February 1994
44 * %z code from chip@chinacat.unicom.com
45 * Applied September 1995
46 * %V code fixed (again) and %G, %g added,
47 * January 1996
48 */
49
50 #include "ruby/ruby.h"
51 #include "ruby/encoding.h"
52 #include "timev.h"
53
54 #ifndef GAWK
55 #include <stdio.h>
56 #include <ctype.h>
57 #include <string.h>
58 #include <time.h>
59 #include <sys/types.h>
60 #include <errno.h>
61 #endif
62 #if defined(TM_IN_SYS_TIME) || !defined(GAWK)
63 #include <sys/types.h>
64 #if HAVE_SYS_TIME_H
65 #include <sys/time.h>
66 #endif
67 #endif
68 #include <math.h>
69
70 /* defaults: season to taste */
71 #define SYSV_EXT 1 /* stuff in System V ascftime routine */
72 #define SUNOS_EXT 1 /* stuff in SunOS strftime routine */
73 #define POSIX2_DATE 1 /* stuff in Posix 1003.2 date command */
74 #define VMS_EXT 1 /* include %v for VMS date format */
75 #define MAILHEADER_EXT 1 /* add %z for HHMM format */
76 #define ISO_DATE_EXT 1 /* %G and %g for year of ISO week */
77
78 #if defined(ISO_DATE_EXT)
79 #if ! defined(POSIX2_DATE)
80 #define POSIX2_DATE 1
81 #endif
82 #endif
83
84 #if defined(POSIX2_DATE)
85 #if ! defined(SYSV_EXT)
86 #define SYSV_EXT 1
87 #endif
88 #if ! defined(SUNOS_EXT)
89 #define SUNOS_EXT 1
90 #endif
91 #endif
92
93 #if defined(POSIX2_DATE)
94 #define adddecl(stuff) stuff
95 #else
96 #define adddecl(stuff)
97 #endif
98
99 #undef strchr /* avoid AIX weirdness */
100
101 #if !defined __STDC__ && !defined _WIN32
102 #define const
103 static int weeknumber();
104 adddecl(static int iso8601wknum();)
105 static int weeknumber_v();
106 adddecl(static int iso8601wknum_v();)
107 #else
108 static int weeknumber(const struct tm *timeptr, int firstweekday);
109 adddecl(static int iso8601wknum(const struct tm *timeptr);)
110 static int weeknumber_v(const struct vtm *vtm, int firstweekday);
111 adddecl(static int iso8601wknum_v(const struct vtm *vtm);)
112 #endif
113
114 #ifdef STDC_HEADERS
115 #include <stdlib.h>
116 #include <string.h>
117 #else
118 extern void *malloc();
119 extern void *realloc();
120 extern char *getenv();
121 extern char *strchr();
122 #endif
123
124 #define range(low, item, hi) max((low), min((item), (hi)))
125
126 #undef min /* just in case */
127
128 /* min --- return minimum of two numbers */
129
130 static inline int
131 min(int a, int b)
132 {
133 return (a < b ? a : b);
134 }
135
136 #undef max /* also, just in case */
137
138 /* max --- return maximum of two numbers */
139
140 static inline int
141 max(int a, int b)
142 {
143 return (a > b ? a : b);
144 }
145
146 #ifdef NO_STRING_LITERAL_CONCATENATION
147 #error No string literal concatenation
148 #endif
149
150 #define add(x,y) (rb_funcall((x), '+', 1, (y)))
151 #define sub(x,y) (rb_funcall((x), '-', 1, (y)))
152 #define mul(x,y) (rb_funcall((x), '*', 1, (y)))
153 #define quo(x,y) (rb_funcall((x), rb_intern("quo"), 1, (y)))
154 #define div(x,y) (rb_funcall((x), rb_intern("div"), 1, (y)))
155 #define mod(x,y) (rb_funcall((x), '%', 1, (y)))
156
157 /* strftime --- produce formatted time */
158
159 /*
160 * enc is the encoding of the format. It is used as the encoding of resulted
161 * string, but the name of the month and weekday are always US-ASCII. So it
162 * is only used for the timezone name on Windows.
163 */
164 static size_t
165 rb_strftime_with_timespec(char *s, size_t maxsize, const char *format, rb_encoding *enc, const struct vtm *vtm, VALUE timev, struct timespec *ts, int gmt)
166 {
167 const char *const endp = s + maxsize;
168 const char *const start = s;
169 const char *sp, *tp;
170 #define TBUFSIZE 100
171 auto char tbuf[TBUFSIZE];
172 long off;
173 ptrdiff_t i;
174 int w;
175 long y;
176 int precision, flags, colons;
177 char padding;
178 enum {LEFT, CHCASE, LOWER, UPPER};
179 #define BIT_OF(n) (1U<<(n))
180 #ifdef MAILHEADER_EXT
181 int sign;
182 #endif
183
184 /* various tables, useful in North America */
185 static const char days_l[][10] = {
186 "Sunday", "Monday", "Tuesday", "Wednesday",
187 "Thursday", "Friday", "Saturday",
188 };
189 static const char months_l[][10] = {
190 "January", "February", "March", "April",
191 "May", "June", "July", "August", "September",
192 "October", "November", "December",
193 };
194 static const char ampm[][3] = { "AM", "PM", };
195
196 if (s == NULL || format == NULL || vtm == NULL || maxsize == 0)
197 return 0;
198
199 /* quick check if we even need to bother */
200 if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize) {
201 err:
202 errno = ERANGE;
203 return 0;
204 }
205
206 if (enc && (enc == rb_usascii_encoding() ||
207 enc == rb_ascii8bit_encoding() || enc == rb_locale_encoding())) {
208 enc = NULL;
209 }
210
211 for (; *format && s < endp - 1; format++) {
212 #define FLAG_FOUND() do { \
213 if (precision > 0) \
214 goto unknown; \
215 } while (0)
216 #define NEEDS(n) do if (s >= endp || (n) >= endp - s - 1) goto err; while (0)
217 #define FILL_PADDING(i) do { \
218 if (!(flags & BIT_OF(LEFT)) && precision > (i)) { \
219 NEEDS(precision); \
220 memset(s, padding ? padding : ' ', precision - (i)); \
221 s += precision - (i); \
222 } \
223 else { \
224 NEEDS(i); \
225 } \
226 } while (0);
227 #define FMT(def_pad, def_prec, fmt, val) \
228 do { \
229 int l; \
230 if (precision <= 0) precision = (def_prec); \
231 if (flags & BIT_OF(LEFT)) precision = 1; \
232 l = snprintf(s, endp - s, \
233 ((padding == '0' || (!padding && (def_pad) == '0')) ? "%0*"fmt : "%*"fmt), \
234 precision, (val)); \
235 if (l < 0) goto err; \
236 s += l; \
237 } while (0)
238 #define STRFTIME(fmt) \
239 do { \
240 i = rb_strftime_with_timespec(s, endp - s, (fmt), enc, vtm, timev, ts, gmt); \
241 if (!i) return 0; \
242 if (precision > i) {\
243 NEEDS(precision); \
244 memmove(s + precision - i, s, i);\
245 memset(s, padding ? padding : ' ', precision - i); \
246 s += precision; \
247 }\
248 else s += i; \
249 } while (0)
250 #define FMTV(def_pad, def_prec, fmt, val) \
251 do { \
252 VALUE tmp = (val); \
253 if (FIXNUM_P(tmp)) { \
254 FMT((def_pad), (def_prec), "l"fmt, FIX2LONG(tmp)); \
255 } \
256 else { \
257 VALUE args[2], result; \
258 size_t l; \
259 if (precision <= 0) precision = (def_prec); \
260 if (flags & BIT_OF(LEFT)) precision = 1; \
261 args[0] = INT2FIX(precision); \
262 args[1] = (val); \
263 if (padding == '0' || (!padding && (def_pad) == '0')) \
264 result = rb_str_format(2, args, rb_str_new2("%0*"fmt)); \
265 else \
266 result = rb_str_format(2, args, rb_str_new2("%*"fmt)); \
267 l = strlcpy(s, StringValueCStr(result), endp-s); \
268 if ((size_t)(endp-s) <= l) \
269 goto err; \
270 s += l; \
271 } \
272 } while (0)
273
274 if (*format != '%') {
275 *s++ = *format;
276 continue;
277 }
278 tp = tbuf;
279 sp = format;
280 precision = -1;
281 flags = 0;
282 padding = 0;
283 colons = 0;
284 again:
285 switch (*++format) {
286 case '\0':
287 format--;
288 goto unknown;
289
290 case '%':
291 FILL_PADDING(1);
292 *s++ = '%';
293 continue;
294
295 case 'a': /* abbreviated weekday name */
296 if (flags & BIT_OF(CHCASE)) {
297 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
298 flags |= BIT_OF(UPPER);
299 }
300 if (vtm->wday < 0 || vtm->wday > 6)
301 i = 1, tp = "?";
302 else
303 i = 3, tp = days_l[vtm->wday];
304 break;
305
306 case 'A': /* full weekday name */
307 if (flags & BIT_OF(CHCASE)) {
308 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
309 flags |= BIT_OF(UPPER);
310 }
311 if (vtm->wday < 0 || vtm->wday > 6)
312 i = 1, tp = "?";
313 else
314 i = strlen(tp = days_l[vtm->wday]);
315 break;
316
317 #ifdef SYSV_EXT
318 case 'h': /* abbreviated month name */
319 #endif
320 case 'b': /* abbreviated month name */
321 if (flags & BIT_OF(CHCASE)) {
322 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
323 flags |= BIT_OF(UPPER);
324 }
325 if (vtm->mon < 1 || vtm->mon > 12)
326 i = 1, tp = "?";
327 else
328 i = 3, tp = months_l[vtm->mon-1];
329 break;
330
331 case 'B': /* full month name */
332 if (flags & BIT_OF(CHCASE)) {
333 flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
334 flags |= BIT_OF(UPPER);
335 }
336 if (vtm->mon < 1 || vtm->mon > 12)
337 i = 1, tp = "?";
338 else
339 i = strlen(tp = months_l[vtm->mon-1]);
340 break;
341
342 case 'c': /* appropriate date and time representation */
343 STRFTIME("%a %b %e %H:%M:%S %Y");
344 continue;
345
346 case 'd': /* day of the month, 01 - 31 */
347 i = range(1, vtm->mday, 31);
348 FMT('0', 2, "d", (int)i);
349 continue;
350
351 case 'H': /* hour, 24-hour clock, 00 - 23 */
352 i = range(0, vtm->hour, 23);
353 FMT('0', 2, "d", (int)i);
354 continue;
355
356 case 'I': /* hour, 12-hour clock, 01 - 12 */
357 i = range(0, vtm->hour, 23);
358 if (i == 0)
359 i = 12;
360 else if (i > 12)
361 i -= 12;
362 FMT('0', 2, "d", (int)i);
363 continue;
364
365 case 'j': /* day of the year, 001 - 366 */
366 FMT('0', 3, "d", vtm->yday);
367 continue;
368
369 case 'm': /* month, 01 - 12 */
370 i = range(1, vtm->mon, 12);
371 FMT('0', 2, "d", (int)i);
372 continue;
373
374 case 'M': /* minute, 00 - 59 */
375 i = range(0, vtm->min, 59);
376 FMT('0', 2, "d", (int)i);
377 continue;
378
379 case 'p': /* AM or PM based on 12-hour clock */
380 case 'P': /* am or pm based on 12-hour clock */
381 if ((*format == 'p' && (flags & BIT_OF(CHCASE))) ||
382 (*format == 'P' && !(flags & (BIT_OF(CHCASE)|BIT_OF(UPPER))))) {
383 flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
384 flags |= BIT_OF(LOWER);
385 }
386 i = range(0, vtm->hour, 23);
387 if (i < 12)
388 tp = ampm[0];
389 else
390 tp = ampm[1];
391 i = 2;
392 break;
393
394 case 's':
395 if (ts) {
396 time_t sec = ts->tv_sec;
397 if (~(time_t)0 <= 0)
398 FMT('0', 1, PRI_TIMET_PREFIX"d", sec);
399 else
400 FMT('0', 1, PRI_TIMET_PREFIX"u", sec);
401 }
402 else {
403 VALUE sec = div(timev, INT2FIX(1));
404 FMTV('0', 1, "d", sec);
405 }
406 continue;
407
408 case 'S': /* second, 00 - 60 */
409 i = range(0, vtm->sec, 60);
410 FMT('0', 2, "d", (int)i);
411 continue;
412
413 case 'U': /* week of year, Sunday is first day of week */
414 FMT('0', 2, "d", weeknumber_v(vtm, 0));
415 continue;
416
417 case 'w': /* weekday, Sunday == 0, 0 - 6 */
418 i = range(0, vtm->wday, 6);
419 FMT('0', 1, "d", (int)i);
420 continue;
421
422 case 'W': /* week of year, Monday is first day of week */
423 FMT('0', 2, "d", weeknumber_v(vtm, 1));
424 continue;
425
426 case 'x': /* appropriate date representation */
427 STRFTIME("%m/%d/%y");
428 continue;
429
430 case 'X': /* appropriate time representation */
431 STRFTIME("%H:%M:%S");
432 continue;
433
434 case 'y': /* year without a century, 00 - 99 */
435 i = NUM2INT(mod(vtm->year, INT2FIX(100)));
436 FMT('0', 2, "d", (int)i);
437 continue;
438
439 case 'Y': /* year with century */
440 if (FIXNUM_P(vtm->year)) {
441 long y = FIX2LONG(vtm->year);
442 FMT('0', 0 <= y ? 4 : 5, "ld", y);
443 }
444 else {
445 FMTV('0', 4, "d", vtm->year);
446 }
447 continue;
448
449 #ifdef MAILHEADER_EXT
450 case 'z': /* time zone offset east of GMT e.g. -0600 */
451 if (gmt) {
452 off = 0;
453 }
454 else {
455 off = NUM2LONG(rb_funcall(vtm->utc_offset, rb_intern("round"), 0));
456 }
457 if (off < 0) {
458 off = -off;
459 sign = -1;
460 } else {
461 sign = +1;
462 }
463 switch (colons) {
464 case 0: /* %z -> +hhmm */
465 precision = precision <= 5 ? 2 : precision-3;
466 NEEDS(precision + 3);
467 break;
468
469 case 1: /* %:z -> +hh:mm */
470 precision = precision <= 6 ? 2 : precision-4;
471 NEEDS(precision + 4);
472 break;
473
474 case 2: /* %::z -> +hh:mm:ss */
475 precision = precision <= 9 ? 2 : precision-7;
476 NEEDS(precision + 7);
477 break;
478
479 case 3: /* %:::z -> +hh[:mm[:ss]] */
480 if (off % 3600 == 0) {
481 precision = precision <= 3 ? 2 : precision-1;
482 NEEDS(precision + 3);
483 }
484 else if (off % 60 == 0) {
485 precision = precision <= 6 ? 2 : precision-4;
486 NEEDS(precision + 4);
487 }
488 else {
489 precision = precision <= 9 ? 2 : precision-7;
490 NEEDS(precision + 9);
491 }
492 break;
493
494 default:
495 format--;
496 goto unknown;
497 }
498 i = snprintf(s, endp - s, (padding == ' ' ? "%+*ld" : "%+.*ld"),
499 precision + 1, sign * (off / 3600));
500 if (i < 0) goto err;
501 if (sign < 0 && off < 3600) {
502 *(padding == ' ' ? s + i - 2 : s) = '-';
503 }
504 s += i;
505 off = off % 3600;
506 if (colons == 3 && off == 0)
507 continue;
508 if (1 <= colons)
509 *s++ = ':';
510 i = snprintf(s, endp - s, "%02d", (int)(off / 60));
511 if (i < 0) goto err;
512 s += i;
513 off = off % 60;
514 if (colons == 3 && off == 0)
515 continue;
516 if (2 <= colons) {
517 *s++ = ':';
518 i = snprintf(s, endp - s, "%02d", (int)off);
519 if (i < 0) goto err;
520 s += i;
521 }
522 continue;
523 #endif /* MAILHEADER_EXT */
524
525 case 'Z': /* time zone name or abbreviation */
526 if (flags & BIT_OF(CHCASE)) {
527 flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
528 flags |= BIT_OF(LOWER);
529 }
530 if (gmt) {
531 i = 3;
532 tp = "UTC";
533 break;
534 }
535 if (vtm->zone == NULL) {
536 i = 0;
537 }
538 else {
539 tp = vtm->zone;
540 if (enc) {
541 for (i = 0; i < TBUFSIZE && tp[i]; i++) {
542 if ((unsigned char)tp[i] > 0x7F) {
543 VALUE str = rb_str_conv_enc_opts(rb_str_new_cstr(tp), rb_locale_encoding(), enc, ECONV_UNDEF_REPLACE|ECONV_INVALID_REPLACE, Qnil);
544 i = strlcpy(tbuf, RSTRING_PTR(str), TBUFSIZE);
545 tp = tbuf;
546 break;
547 }
548 }
549 }
550 else
551 i = strlen(tp);
552 }
553 break;
554
555 #ifdef SYSV_EXT
556 case 'n': /* same as \n */
557 FILL_PADDING(1);
558 *s++ = '\n';
559 continue;
560
561 case 't': /* same as \t */
562 FILL_PADDING(1);
563 *s++ = '\t';
564 continue;
565
566 case 'D': /* date as %m/%d/%y */
567 STRFTIME("%m/%d/%y");
568 continue;
569
570 case 'e': /* day of month, blank padded */
571 FMT(' ', 2, "d", range(1, vtm->mday, 31));
572 continue;
573
574 case 'r': /* time as %I:%M:%S %p */
575 STRFTIME("%I:%M:%S %p");
576 continue;
577
578 case 'R': /* time as %H:%M */
579 STRFTIME("%H:%M");
580 continue;
581
582 case 'T': /* time as %H:%M:%S */
583 STRFTIME("%H:%M:%S");
584 continue;
585 #endif
586
587 #ifdef SUNOS_EXT
588 case 'k': /* hour, 24-hour clock, blank pad */
589 i = range(0, vtm->hour, 23);
590 FMT(' ', 2, "d", (int)i);
591 continue;
592
593 case 'l': /* hour, 12-hour clock, 1 - 12, blank pad */
594 i = range(0, vtm->hour, 23);
595 if (i == 0)
596 i = 12;
597 else if (i > 12)
598 i -= 12;
599 FMT(' ', 2, "d", (int)i);
600 continue;
601 #endif
602
603
604 #ifdef VMS_EXT
605 case 'v': /* date as dd-bbb-YYYY */
606 STRFTIME("%e-%^b-%4Y");
607 continue;
608 #endif
609
610
611 #ifdef POSIX2_DATE
612 case 'C':
613 FMTV('0', 2, "d", div(vtm->year, INT2FIX(100)));
614 continue;
615
616 case 'E':
617 /* POSIX locale extensions, ignored for now */
618 if (!format[1] || !strchr("cCxXyY", format[1]))
619 goto unknown;
620 goto again;
621 case 'O':
622 /* POSIX locale extensions, ignored for now */
623 if (!format[1] || !strchr("deHkIlmMSuUVwWy", format[1]))
624 goto unknown;
625 goto again;
626
627 case 'V': /* week of year according ISO 8601 */
628 FMT('0', 2, "d", iso8601wknum_v(vtm));
629 continue;
630
631 case 'u':
632 /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */
633 FMT('0', 1, "d", vtm->wday == 0 ? 7 : vtm->wday);
634 continue;
635 #endif /* POSIX2_DATE */
636
637 #ifdef ISO_DATE_EXT
638 case 'G':
639 case 'g':
640 /*
641 * Year of ISO week.
642 *
643 * If it's December but the ISO week number is one,
644 * that week is in next year.
645 * If it's January but the ISO week number is 52 or
646 * 53, that week is in last year.
647 * Otherwise, it's this year.
648 */
649 {
650 VALUE yv = vtm->year;
651 w = iso8601wknum_v(vtm);
652 if (vtm->mon == 12 && w == 1)
653 yv = add(yv, INT2FIX(1));
654 else if (vtm->mon == 1 && w >= 52)
655 yv = sub(yv, INT2FIX(1));
656
657 if (*format == 'G') {
658 if (FIXNUM_P(yv)) {
659 const long y = FIX2LONG(yv);
660 FMT('0', 0 <= y ? 4 : 5, "ld", y);
661 }
662 else {
663 FMTV('0', 4, "d", yv);
664 }
665 }
666 else {
667 yv = mod(yv, INT2FIX(100));
668 y = FIX2LONG(yv);
669 FMT('0', 2, "ld", y);
670 }
671 continue;
672 }
673
674 #endif /* ISO_DATE_EXT */
675
676
677 case 'L':
678 w = 3;
679 goto subsec;
680
681 case 'N':
682 /*
683 * fractional second digits. default is 9 digits
684 * (nanosecond).
685 *
686 * %3N millisecond (3 digits)
687 * %6N microsecond (6 digits)
688 * %9N nanosecond (9 digits)
689 */
690 w = 9;
691 subsec:
692 if (precision <= 0) {
693 precision = w;
694 }
695 NEEDS(precision);
696
697 if (ts) {
698 long subsec = ts->tv_nsec;
699 if (9 < precision) {
700 snprintf(s, endp - s, "%09ld", subsec);
701 memset(s+9, '0', precision-9);
702 s += precision;
703 }
704 else {
705 int i;
706 for (i = 0; i < 9-precision; i++)
707 subsec /= 10;
708 snprintf(s, endp - s, "%0*ld", precision, subsec);
709 s += precision;
710 }
711 }
712 else {
713 VALUE subsec = mod(timev, INT2FIX(1));
714 int ww;
715 long n;
716
717 ww = precision;
718 while (9 <= ww) {
719 subsec = mul(subsec, INT2FIX(1000000000));
720 ww -= 9;
721 }
722 n = 1;
723 for (; 0 < ww; ww--)
724 n *= 10;
725 if (n != 1)
726 subsec = mul(subsec, INT2FIX(n));
727 subsec = div(subsec, INT2FIX(1));
728
729 if (FIXNUM_P(subsec)) {
730 (void)snprintf(s, endp - s, "%0*ld", precision, FIX2LONG(subsec));
731 s += precision;
732 }
733 else {
734 VALUE args[2], result;
735 args[0] = INT2FIX(precision);
736 args[1] = subsec;
737 result = rb_str_format(2, args, rb_str_new2("%0*d"));
738 (void)strlcpy(s, StringValueCStr(result), endp-s);
739 s += precision;
740 }
741 }
742 continue;
743
744 case 'F': /* Equivalent to %Y-%m-%d */
745 STRFTIME("%Y-%m-%d");
746 continue;
747
748 case '-':
749 FLAG_FOUND();
750 flags |= BIT_OF(LEFT);
751 padding = precision = 0;
752 goto again;
753
754 case '^':
755 FLAG_FOUND();
756 flags |= BIT_OF(UPPER);
757 goto again;
758
759 case '#':
760 FLAG_FOUND();
761 flags |= BIT_OF(CHCASE);
762 goto again;
763
764 case '_':
765 FLAG_FOUND();
766 padding = ' ';
767 goto again;
768
769 case ':':
770 {
771 size_t l = strspn(format, ":");
772 if (l > 3 || format[l] != 'z') goto unknown;
773 colons = (int)l;
774 format += l - 1;
775 }
776 goto again;
777
778 case '0':
779 padding = '0';
780 case '1': case '2': case '3': case '4':
781 case '5': case '6': case '7': case '8': case '9':
782 {
783 char *e;
784 precision = (int)strtoul(format, &e, 10);
785 format = e - 1;
786 goto again;
787 }
788
789 default:
790 unknown:
791 i = format - sp + 1;
792 tp = sp;
793 precision = -1;
794 flags = 0;
795 padding = 0;
796 colons = 0;
797 break;
798 }
799 if (i) {
800 FILL_PADDING(i);
801 memcpy(s, tp, i);
802 switch (flags & (BIT_OF(UPPER)|BIT_OF(LOWER))) {
803 case BIT_OF(UPPER):
804 do {
805 if (ISLOWER(*s)) *s = TOUPPER(*s);
806 } while (s++, --i);
807 break;
808 case BIT_OF(LOWER):
809 do {
810 if (ISUPPER(*s)) *s = TOLOWER(*s);
811 } while (s++, --i);
812 break;
813 default:
814 s += i;
815 break;
816 }
817 }
818 }
819 if (s >= endp) {
820 goto err;
821 }
822 if (*format == '\0') {
823 *s = '\0';
824 return (s - start);
825 } else
826 return 0;
827 }
828
829 size_t
830 rb_strftime(char *s, size_t maxsize, const char *format, rb_encoding *enc, const struct vtm *vtm, VALUE timev, int gmt)
831 {
832 return rb_strftime_with_timespec(s, maxsize, format, enc, vtm, timev, NULL, gmt);
833 }
834
835 size_t
836 rb_strftime_timespec(char *s, size_t maxsize, const char *format, rb_encoding *enc, const struct vtm *vtm, struct timespec *ts, int gmt)
837 {
838 return rb_strftime_with_timespec(s, maxsize, format, enc, vtm, Qnil, ts, gmt);
839 }
840
841 /* isleap --- is a year a leap year? */
842
843 static int
844 isleap(long year)
845 {
846 return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
847 }
848
849
850 static void
851 vtm2tm_noyear(const struct vtm *vtm, struct tm *result)
852 {
853 struct tm tm;
854
855 /* for isleap() in iso8601wknum. +100 is -1900 (mod 400). */
856 tm.tm_year = FIX2INT(mod(vtm->year, INT2FIX(400))) + 100;
857
858 tm.tm_mon = vtm->mon-1;
859 tm.tm_mday = vtm->mday;
860 tm.tm_hour = vtm->hour;
861 tm.tm_min = vtm->min;
862 tm.tm_sec = vtm->sec;
863 tm.tm_wday = vtm->wday;
864 tm.tm_yday = vtm->yday-1;
865 tm.tm_isdst = vtm->isdst;
866 #if defined(HAVE_STRUCT_TM_TM_GMTOFF)
867 tm.tm_gmtoff = NUM2LONG(vtm->utc_offset);
868 #endif
869 #if defined(HAVE_TM_ZONE)
870 tm.tm_zone = (char *)vtm->zone;
871 #endif
872 *result = tm;
873 }
874
875 #ifdef POSIX2_DATE
876 /* iso8601wknum --- compute week number according to ISO 8601 */
877
878 static int
879 iso8601wknum(const struct tm *timeptr)
880 {
881 /*
882 * From 1003.2:
883 * If the week (Monday to Sunday) containing January 1
884 * has four or more days in the new year, then it is week 1;
885 * otherwise it is the highest numbered week of the previous
886 * year (52 or 53), and the next week is week 1.
887 *
888 * ADR: This means if Jan 1 was Monday through Thursday,
889 * it was week 1, otherwise week 52 or 53.
890 *
891 * XPG4 erroneously included POSIX.2 rationale text in the
892 * main body of the standard. Thus it requires week 53.
893 */
894
895 int weeknum, jan1day;
896
897 /* get week number, Monday as first day of the week */
898 weeknum = weeknumber(timeptr, 1);
899
900 /*
901 * With thanks and tip of the hatlo to tml@tik.vtt.fi
902 *
903 * What day of the week does January 1 fall on?
904 * We know that
905 * (timeptr->tm_yday - jan1.tm_yday) MOD 7 ==
906 * (timeptr->tm_wday - jan1.tm_wday) MOD 7
907 * and that
908 * jan1.tm_yday == 0
909 * and that
910 * timeptr->tm_wday MOD 7 == timeptr->tm_wday
911 * from which it follows that. . .
912 */
913 jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7);
914 if (jan1day < 0)
915 jan1day += 7;
916
917 /*
918 * If Jan 1 was a Monday through Thursday, it was in
919 * week 1. Otherwise it was last year's highest week, which is
920 * this year's week 0.
921 *
922 * What does that mean?
923 * If Jan 1 was Monday, the week number is exactly right, it can
924 * never be 0.
925 * If it was Tuesday through Thursday, the weeknumber is one
926 * less than it should be, so we add one.
927 * Otherwise, Friday, Saturday or Sunday, the week number is
928 * OK, but if it is 0, it needs to be 52 or 53.
929 */
930 switch (jan1day) {
931 case 1: /* Monday */
932 break;
933 case 2: /* Tuesday */
934 case 3: /* Wednesday */
935 case 4: /* Thursday */
936 weeknum++;
937 break;
938 case 5: /* Friday */
939 case 6: /* Saturday */
940 case 0: /* Sunday */
941 if (weeknum == 0) {
942 #ifdef USE_BROKEN_XPG4
943 /* XPG4 (as of March 1994) says 53 unconditionally */
944 weeknum = 53;
945 #else
946 /* get week number of last week of last year */
947 struct tm dec31ly; /* 12/31 last year */
948 dec31ly = *timeptr;
949 dec31ly.tm_year--;
950 dec31ly.tm_mon = 11;
951 dec31ly.tm_mday = 31;
952 dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1;
953 dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900L);
954 weeknum = iso8601wknum(& dec31ly);
955 #endif
956 }
957 break;
958 }
959
960 if (timeptr->tm_mon == 11) {
961 /*
962 * The last week of the year
963 * can be in week 1 of next year.
964 * Sigh.
965 *
966 * This can only happen if
967 * M T W
968 * 29 30 31
969 * 30 31
970 * 31
971 */
972 int wday, mday;
973
974 wday = timeptr->tm_wday;
975 mday = timeptr->tm_mday;
976 if ( (wday == 1 && (mday >= 29 && mday <= 31))
977 || (wday == 2 && (mday == 30 || mday == 31))
978 || (wday == 3 && mday == 31))
979 weeknum = 1;
980 }
981
982 return weeknum;
983 }
984
985 static int
986 iso8601wknum_v(const struct vtm *vtm)
987 {
988 struct tm tm;
989 vtm2tm_noyear(vtm, &tm);
990 return iso8601wknum(&tm);
991 }
992
993 #endif
994
995 /* weeknumber --- figure how many weeks into the year */
996
997 /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */
998
999 static int
1000 weeknumber(const struct tm *timeptr, int firstweekday)
1001 {
1002 int wday = timeptr->tm_wday;
1003 int ret;
1004
1005 if (firstweekday == 1) {
1006 if (wday == 0) /* sunday */
1007 wday = 6;
1008 else
1009 wday--;
1010 }
1011 ret = ((timeptr->tm_yday + 7 - wday) / 7);
1012 if (ret < 0)
1013 ret = 0;
1014 return ret;
1015 }
1016
1017 static int
1018 weeknumber_v(const struct vtm *vtm, int firstweekday)
1019 {
1020 struct tm tm;
1021 vtm2tm_noyear(vtm, &tm);
1022 return weeknumber(&tm, firstweekday);
1023 }
1024
1025 #if 0
1026 /* ADR --- I'm loathe to mess with ado's code ... */
1027
1028 Date: Wed, 24 Apr 91 20:54:08 MDT
1029 From: Michal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK>
1030 To: arnold@audiofax.com
1031
1032 Hi Arnold,
1033 in a process of fixing of strftime() in libraries on Atari ST I grabbed
1034 some pieces of code from your own strftime. When doing that it came
1035 to mind that your weeknumber() function compiles a little bit nicer
1036 in the following form:
1037 /*
1038 * firstweekday is 0 if starting in Sunday, non-zero if in Monday
1039 */
1040 {
1041 return (timeptr->tm_yday - timeptr->tm_wday +
1042 (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7;
1043 }
1044 How nicer it depends on a compiler, of course, but always a tiny bit.
1045
1046 Cheers,
1047 Michal
1048 ntomczak@vm.ucs.ualberta.ca
1049 #endif
1050
1051 #ifdef TEST_STRFTIME
1052
1053 /*
1054 * NAME:
1055 * tst
1056 *
1057 * SYNOPSIS:
1058 * tst
1059 *
1060 * DESCRIPTION:
1061 * "tst" is a test driver for the function "strftime".
1062 *
1063 * OPTIONS:
1064 * None.
1065 *
1066 * AUTHOR:
1067 * Karl Vogel
1068 * Control Data Systems, Inc.
1069 * vogelke@c-17igp.wpafb.af.mil
1070 *
1071 * BUGS:
1072 * None noticed yet.
1073 *
1074 * COMPILE:
1075 * cc -o tst -DTEST_STRFTIME strftime.c
1076 */
1077
1078 /* ADR: I reformatted this to my liking, and deleted some unneeded code. */
1079
1080 #ifndef NULL
1081 #include <stdio.h>
1082 #endif
1083 #include <sys/time.h>
1084 #include <string.h>
1085
1086 #define MAXTIME 132
1087
1088 /*
1089 * Array of time formats.
1090 */
1091
1092 static char *array[] =
1093 {
1094 "(%%A) full weekday name, var length (Sunday..Saturday) %A",
1095 "(%%B) full month name, var length (January..December) %B",
1096 "(%%C) Century %C",
1097 "(%%D) date (%%m/%%d/%%y) %D",
1098 "(%%E) Locale extensions (ignored) %E",
1099 "(%%H) hour (24-hour clock, 00..23) %H",
1100 "(%%I) hour (12-hour clock, 01..12) %I",
1101 "(%%M) minute (00..59) %M",
1102 "(%%O) Locale extensions (ignored) %O",
1103 "(%%R) time, 24-hour (%%H:%%M) %R",
1104 "(%%S) second (00..60) %S",
1105 "(%%T) time, 24-hour (%%H:%%M:%%S) %T",
1106 "(%%U) week of year, Sunday as first day of week (00..53) %U",
1107 "(%%V) week of year according to ISO 8601 %V",
1108 "(%%W) week of year, Monday as first day of week (00..53) %W",
1109 "(%%X) appropriate locale time representation (%H:%M:%S) %X",
1110 "(%%Y) year with century (1970...) %Y",
1111 "(%%Z) timezone (EDT), or blank if timezone not determinable %Z",
1112 "(%%a) locale's abbreviated weekday name (Sun..Sat) %a",
1113 "(%%b) locale's abbreviated month name (Jan..Dec) %b",
1114 "(%%c) full date (Sat Nov 4 12:02:33 1989)%n%t%t%t %c",
1115 "(%%d) day of the month (01..31) %d",
1116 "(%%e) day of the month, blank-padded ( 1..31) %e",
1117 "(%%h) should be same as (%%b) %h",
1118 "(%%j) day of the year (001..366) %j",
1119 "(%%k) hour, 24-hour clock, blank pad ( 0..23) %k",
1120 "(%%l) hour, 12-hour clock, blank pad ( 1..12) %l",
1121 "(%%m) month (01..12) %m",
1122 "(%%p) locale's AM or PM based on 12-hour clock %p",
1123 "(%%r) time, 12-hour (same as %%I:%%M:%%S %%p) %r",
1124 "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7] %u",
1125 "(%%v) VMS date (dd-bbb-YYYY) %v",
1126 "(%%w) day of week (0..6, Sunday == 0) %w",
1127 "(%%x) appropriate locale date representation %x",
1128 "(%%y) last two digits of year (00..99) %y",
1129 "(%%z) timezone offset east of GMT as HHMM (e.g. -0500) %z",
1130 (char *) NULL
1131 };
1132
1133 /* main routine. */
1134
1135 int
1136 main(int argc, char **argv)
1137 {
1138 long time();
1139
1140 char *next;
1141 char string[MAXTIME];
1142
1143 int k;
1144 int length;
1145
1146 struct tm *tm;
1147
1148 long clock;
1149
1150 /* Call the function. */
1151
1152 clock = time((long *) 0);
1153 tm = localtime(&clock);
1154
1155 for (k = 0; next = array[k]; k++) {
1156 length = strftime(string, MAXTIME, next, tm);
1157 printf("%s\n", string);
1158 }
1159
1160 exit(0);
1161 }
1162 #endif /* TEST_STRFTIME */
1163