Ruby  2.1.10p492(2016-04-01revision54464)
strftime.c
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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  i = range(1, vtm->yday, 366);
367  FMT('0', 3, "d", (int)i);
368  continue;
369 
370  case 'm': /* month, 01 - 12 */
371  i = range(1, vtm->mon, 12);
372  FMT('0', 2, "d", (int)i);
373  continue;
374 
375  case 'M': /* minute, 00 - 59 */
376  i = range(0, vtm->min, 59);
377  FMT('0', 2, "d", (int)i);
378  continue;
379 
380  case 'p': /* AM or PM based on 12-hour clock */
381  case 'P': /* am or pm based on 12-hour clock */
382  if ((*format == 'p' && (flags & BIT_OF(CHCASE))) ||
383  (*format == 'P' && !(flags & (BIT_OF(CHCASE)|BIT_OF(UPPER))))) {
384  flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
385  flags |= BIT_OF(LOWER);
386  }
387  i = range(0, vtm->hour, 23);
388  if (i < 12)
389  tp = ampm[0];
390  else
391  tp = ampm[1];
392  i = 2;
393  break;
394 
395  case 's':
396  if (ts) {
397  time_t sec = ts->tv_sec;
398  if (~(time_t)0 <= 0)
399  FMT('0', 1, PRI_TIMET_PREFIX"d", sec);
400  else
401  FMT('0', 1, PRI_TIMET_PREFIX"u", sec);
402  }
403  else {
404  VALUE sec = div(timev, INT2FIX(1));
405  FMTV('0', 1, "d", sec);
406  }
407  continue;
408 
409  case 'S': /* second, 00 - 60 */
410  i = range(0, vtm->sec, 60);
411  FMT('0', 2, "d", (int)i);
412  continue;
413 
414  case 'U': /* week of year, Sunday is first day of week */
415  FMT('0', 2, "d", weeknumber_v(vtm, 0));
416  continue;
417 
418  case 'w': /* weekday, Sunday == 0, 0 - 6 */
419  i = range(0, vtm->wday, 6);
420  FMT('0', 1, "d", (int)i);
421  continue;
422 
423  case 'W': /* week of year, Monday is first day of week */
424  FMT('0', 2, "d", weeknumber_v(vtm, 1));
425  continue;
426 
427  case 'x': /* appropriate date representation */
428  STRFTIME("%m/%d/%y");
429  continue;
430 
431  case 'X': /* appropriate time representation */
432  STRFTIME("%H:%M:%S");
433  continue;
434 
435  case 'y': /* year without a century, 00 - 99 */
436  i = NUM2INT(mod(vtm->year, INT2FIX(100)));
437  FMT('0', 2, "d", (int)i);
438  continue;
439 
440  case 'Y': /* year with century */
441  if (FIXNUM_P(vtm->year)) {
442  long y = FIX2LONG(vtm->year);
443  FMT('0', 0 <= y ? 4 : 5, "ld", y);
444  }
445  else {
446  FMTV('0', 4, "d", vtm->year);
447  }
448  continue;
449 
450 #ifdef MAILHEADER_EXT
451  case 'z': /* time zone offset east of GMT e.g. -0600 */
452  if (gmt) {
453  off = 0;
454  }
455  else {
456  off = NUM2LONG(rb_funcall(vtm->utc_offset, rb_intern("round"), 0));
457  }
458  if (off < 0) {
459  off = -off;
460  sign = -1;
461  } else {
462  sign = +1;
463  }
464  switch (colons) {
465  case 0: /* %z -> +hhmm */
466  precision = precision <= 5 ? 2 : precision-3;
467  NEEDS(precision + 3);
468  break;
469 
470  case 1: /* %:z -> +hh:mm */
471  precision = precision <= 6 ? 2 : precision-4;
472  NEEDS(precision + 4);
473  break;
474 
475  case 2: /* %::z -> +hh:mm:ss */
476  precision = precision <= 9 ? 2 : precision-7;
477  NEEDS(precision + 7);
478  break;
479 
480  case 3: /* %:::z -> +hh[:mm[:ss]] */
481  if (off % 3600 == 0) {
482  precision = precision <= 3 ? 2 : precision-1;
483  NEEDS(precision + 3);
484  }
485  else if (off % 60 == 0) {
486  precision = precision <= 6 ? 2 : precision-4;
487  NEEDS(precision + 4);
488  }
489  else {
490  precision = precision <= 9 ? 2 : precision-7;
491  NEEDS(precision + 9);
492  }
493  break;
494 
495  default:
496  format--;
497  goto unknown;
498  }
499  i = snprintf(s, endp - s, (padding == ' ' ? "%+*ld" : "%+.*ld"),
500  precision + 1, sign * (off / 3600));
501  if (i < 0) goto err;
502  if (sign < 0 && off < 3600) {
503  *(padding == ' ' ? s + i - 2 : s) = '-';
504  }
505  s += i;
506  off = off % 3600;
507  if (colons == 3 && off == 0)
508  continue;
509  if (1 <= colons)
510  *s++ = ':';
511  i = snprintf(s, endp - s, "%02d", (int)(off / 60));
512  if (i < 0) goto err;
513  s += i;
514  off = off % 60;
515  if (colons == 3 && off == 0)
516  continue;
517  if (2 <= colons) {
518  *s++ = ':';
519  i = snprintf(s, endp - s, "%02d", (int)off);
520  if (i < 0) goto err;
521  s += i;
522  }
523  continue;
524 #endif /* MAILHEADER_EXT */
525 
526  case 'Z': /* time zone name or abbreviation */
527  if (flags & BIT_OF(CHCASE)) {
528  flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
529  flags |= BIT_OF(LOWER);
530  }
531  if (gmt) {
532  i = 3;
533  tp = "UTC";
534  break;
535  }
536  if (vtm->zone == NULL) {
537  i = 0;
538  }
539  else {
540  tp = vtm->zone;
541  if (enc) {
542  for (i = 0; i < TBUFSIZE && tp[i]; i++) {
543  if ((unsigned char)tp[i] > 0x7F) {
545  i = strlcpy(tbuf, RSTRING_PTR(str), TBUFSIZE);
546  tp = tbuf;
547  break;
548  }
549  }
550  }
551  else
552  i = strlen(tp);
553  }
554  break;
555 
556 #ifdef SYSV_EXT
557  case 'n': /* same as \n */
558  FILL_PADDING(1);
559  *s++ = '\n';
560  continue;
561 
562  case 't': /* same as \t */
563  FILL_PADDING(1);
564  *s++ = '\t';
565  continue;
566 
567  case 'D': /* date as %m/%d/%y */
568  STRFTIME("%m/%d/%y");
569  continue;
570 
571  case 'e': /* day of month, blank padded */
572  FMT(' ', 2, "d", range(1, vtm->mday, 31));
573  continue;
574 
575  case 'r': /* time as %I:%M:%S %p */
576  STRFTIME("%I:%M:%S %p");
577  continue;
578 
579  case 'R': /* time as %H:%M */
580  STRFTIME("%H:%M");
581  continue;
582 
583  case 'T': /* time as %H:%M:%S */
584  STRFTIME("%H:%M:%S");
585  continue;
586 #endif
587 
588 #ifdef SUNOS_EXT
589  case 'k': /* hour, 24-hour clock, blank pad */
590  i = range(0, vtm->hour, 23);
591  FMT(' ', 2, "d", (int)i);
592  continue;
593 
594  case 'l': /* hour, 12-hour clock, 1 - 12, blank pad */
595  i = range(0, vtm->hour, 23);
596  if (i == 0)
597  i = 12;
598  else if (i > 12)
599  i -= 12;
600  FMT(' ', 2, "d", (int)i);
601  continue;
602 #endif
603 
604 
605 #ifdef VMS_EXT
606  case 'v': /* date as dd-bbb-YYYY */
607  STRFTIME("%e-%^b-%4Y");
608  continue;
609 #endif
610 
611 
612 #ifdef POSIX2_DATE
613  case 'C':
614  FMTV('0', 2, "d", div(vtm->year, INT2FIX(100)));
615  continue;
616 
617  case 'E':
618  /* POSIX locale extensions, ignored for now */
619  if (!format[1] || !strchr("cCxXyY", format[1]))
620  goto unknown;
621  goto again;
622  case 'O':
623  /* POSIX locale extensions, ignored for now */
624  if (!format[1] || !strchr("deHkIlmMSuUVwWy", format[1]))
625  goto unknown;
626  goto again;
627 
628  case 'V': /* week of year according ISO 8601 */
629  FMT('0', 2, "d", iso8601wknum_v(vtm));
630  continue;
631 
632  case 'u':
633  /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */
634  FMT('0', 1, "d", vtm->wday == 0 ? 7 : vtm->wday);
635  continue;
636 #endif /* POSIX2_DATE */
637 
638 #ifdef ISO_DATE_EXT
639  case 'G':
640  case 'g':
641  /*
642  * Year of ISO week.
643  *
644  * If it's December but the ISO week number is one,
645  * that week is in next year.
646  * If it's January but the ISO week number is 52 or
647  * 53, that week is in last year.
648  * Otherwise, it's this year.
649  */
650  {
651  VALUE yv = vtm->year;
652  w = iso8601wknum_v(vtm);
653  if (vtm->mon == 12 && w == 1)
654  yv = add(yv, INT2FIX(1));
655  else if (vtm->mon == 1 && w >= 52)
656  yv = sub(yv, INT2FIX(1));
657 
658  if (*format == 'G') {
659  if (FIXNUM_P(yv)) {
660  const long y = FIX2LONG(yv);
661  FMT('0', 0 <= y ? 4 : 5, "ld", y);
662  }
663  else {
664  FMTV('0', 4, "d", yv);
665  }
666  }
667  else {
668  yv = mod(yv, INT2FIX(100));
669  y = FIX2LONG(yv);
670  FMT('0', 2, "ld", y);
671  }
672  continue;
673  }
674 
675 #endif /* ISO_DATE_EXT */
676 
677 
678  case 'L':
679  w = 3;
680  goto subsec;
681 
682  case 'N':
683  /*
684  * fractional second digits. default is 9 digits
685  * (nanosecond).
686  *
687  * %3N millisecond (3 digits)
688  * %6N microsecond (6 digits)
689  * %9N nanosecond (9 digits)
690  */
691  w = 9;
692  subsec:
693  if (precision <= 0) {
694  precision = w;
695  }
696  NEEDS(precision);
697 
698  if (ts) {
699  long subsec = ts->tv_nsec;
700  if (9 < precision) {
701  snprintf(s, endp - s, "%09ld", subsec);
702  memset(s+9, '0', precision-9);
703  s += precision;
704  }
705  else {
706  int i;
707  for (i = 0; i < 9-precision; i++)
708  subsec /= 10;
709  snprintf(s, endp - s, "%0*ld", precision, subsec);
710  s += precision;
711  }
712  }
713  else {
714  VALUE subsec = mod(timev, INT2FIX(1));
715  int ww;
716  long n;
717 
718  ww = precision;
719  while (9 <= ww) {
720  subsec = mul(subsec, INT2FIX(1000000000));
721  ww -= 9;
722  }
723  n = 1;
724  for (; 0 < ww; ww--)
725  n *= 10;
726  if (n != 1)
727  subsec = mul(subsec, INT2FIX(n));
728  subsec = div(subsec, INT2FIX(1));
729 
730  if (FIXNUM_P(subsec)) {
731  (void)snprintf(s, endp - s, "%0*ld", precision, FIX2LONG(subsec));
732  s += precision;
733  }
734  else {
735  VALUE args[2], result;
736  args[0] = INT2FIX(precision);
737  args[1] = subsec;
738  result = rb_str_format(2, args, rb_str_new2("%0*d"));
739  (void)strlcpy(s, StringValueCStr(result), endp-s);
740  s += precision;
741  }
742  }
743  continue;
744 
745  case 'F': /* Equivalent to %Y-%m-%d */
746  STRFTIME("%Y-%m-%d");
747  continue;
748 
749  case '-':
750  FLAG_FOUND();
751  flags |= BIT_OF(LEFT);
752  padding = precision = 0;
753  goto again;
754 
755  case '^':
756  FLAG_FOUND();
757  flags |= BIT_OF(UPPER);
758  goto again;
759 
760  case '#':
761  FLAG_FOUND();
762  flags |= BIT_OF(CHCASE);
763  goto again;
764 
765  case '_':
766  FLAG_FOUND();
767  padding = ' ';
768  goto again;
769 
770  case ':':
771  {
772  size_t l = strspn(format, ":");
773  if (l > 3 || format[l] != 'z') goto unknown;
774  colons = (int)l;
775  format += l - 1;
776  }
777  goto again;
778 
779  case '0':
780  padding = '0';
781  case '1': case '2': case '3': case '4':
782  case '5': case '6': case '7': case '8': case '9':
783  {
784  char *e;
785  precision = (int)strtoul(format, &e, 10);
786  format = e - 1;
787  goto again;
788  }
789 
790  default:
791  unknown:
792  i = format - sp + 1;
793  tp = sp;
794  precision = -1;
795  flags = 0;
796  padding = 0;
797  colons = 0;
798  break;
799  }
800  if (i) {
801  FILL_PADDING(i);
802  memcpy(s, tp, i);
803  switch (flags & (BIT_OF(UPPER)|BIT_OF(LOWER))) {
804  case BIT_OF(UPPER):
805  do {
806  if (ISLOWER(*s)) *s = TOUPPER(*s);
807  } while (s++, --i);
808  break;
809  case BIT_OF(LOWER):
810  do {
811  if (ISUPPER(*s)) *s = TOLOWER(*s);
812  } while (s++, --i);
813  break;
814  default:
815  s += i;
816  break;
817  }
818  }
819  }
820  if (s >= endp) {
821  goto err;
822  }
823  if (*format == '\0') {
824  *s = '\0';
825  return (s - start);
826  } else
827  return 0;
828 }
829 
830 size_t
831 rb_strftime(char *s, size_t maxsize, const char *format, rb_encoding *enc, const struct vtm *vtm, VALUE timev, int gmt)
832 {
833  return rb_strftime_with_timespec(s, maxsize, format, enc, vtm, timev, NULL, gmt);
834 }
835 
836 size_t
837 rb_strftime_timespec(char *s, size_t maxsize, const char *format, rb_encoding *enc, const struct vtm *vtm, struct timespec *ts, int gmt)
838 {
839  return rb_strftime_with_timespec(s, maxsize, format, enc, vtm, Qnil, ts, gmt);
840 }
841 
842 /* isleap --- is a year a leap year? */
843 
844 static int
845 isleap(long year)
846 {
847  return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
848 }
849 
850 
851 static void
852 vtm2tm_noyear(const struct vtm *vtm, struct tm *result)
853 {
854  struct tm tm;
855 
856  /* for isleap() in iso8601wknum. +100 is -1900 (mod 400). */
857  tm.tm_year = FIX2INT(mod(vtm->year, INT2FIX(400))) + 100;
858 
859  tm.tm_mon = vtm->mon-1;
860  tm.tm_mday = vtm->mday;
861  tm.tm_hour = vtm->hour;
862  tm.tm_min = vtm->min;
863  tm.tm_sec = vtm->sec;
864  tm.tm_wday = vtm->wday;
865  tm.tm_yday = vtm->yday-1;
866  tm.tm_isdst = vtm->isdst;
867 #if defined(HAVE_STRUCT_TM_TM_GMTOFF)
868  tm.tm_gmtoff = NUM2LONG(vtm->utc_offset);
869 #endif
870 #if defined(HAVE_TM_ZONE)
871  tm.tm_zone = (char *)vtm->zone;
872 #endif
873  *result = tm;
874 }
875 
876 #ifdef POSIX2_DATE
877 /* iso8601wknum --- compute week number according to ISO 8601 */
878 
879 static int
880 iso8601wknum(const struct tm *timeptr)
881 {
882  /*
883  * From 1003.2:
884  * If the week (Monday to Sunday) containing January 1
885  * has four or more days in the new year, then it is week 1;
886  * otherwise it is the highest numbered week of the previous
887  * year (52 or 53), and the next week is week 1.
888  *
889  * ADR: This means if Jan 1 was Monday through Thursday,
890  * it was week 1, otherwise week 52 or 53.
891  *
892  * XPG4 erroneously included POSIX.2 rationale text in the
893  * main body of the standard. Thus it requires week 53.
894  */
895 
896  int weeknum, jan1day;
897 
898  /* get week number, Monday as first day of the week */
899  weeknum = weeknumber(timeptr, 1);
900 
901  /*
902  * With thanks and tip of the hatlo to tml@tik.vtt.fi
903  *
904  * What day of the week does January 1 fall on?
905  * We know that
906  * (timeptr->tm_yday - jan1.tm_yday) MOD 7 ==
907  * (timeptr->tm_wday - jan1.tm_wday) MOD 7
908  * and that
909  * jan1.tm_yday == 0
910  * and that
911  * timeptr->tm_wday MOD 7 == timeptr->tm_wday
912  * from which it follows that. . .
913  */
914  jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7);
915  if (jan1day < 0)
916  jan1day += 7;
917 
918  /*
919  * If Jan 1 was a Monday through Thursday, it was in
920  * week 1. Otherwise it was last year's highest week, which is
921  * this year's week 0.
922  *
923  * What does that mean?
924  * If Jan 1 was Monday, the week number is exactly right, it can
925  * never be 0.
926  * If it was Tuesday through Thursday, the weeknumber is one
927  * less than it should be, so we add one.
928  * Otherwise, Friday, Saturday or Sunday, the week number is
929  * OK, but if it is 0, it needs to be 52 or 53.
930  */
931  switch (jan1day) {
932  case 1: /* Monday */
933  break;
934  case 2: /* Tuesday */
935  case 3: /* Wednesday */
936  case 4: /* Thursday */
937  weeknum++;
938  break;
939  case 5: /* Friday */
940  case 6: /* Saturday */
941  case 0: /* Sunday */
942  if (weeknum == 0) {
943 #ifdef USE_BROKEN_XPG4
944  /* XPG4 (as of March 1994) says 53 unconditionally */
945  weeknum = 53;
946 #else
947  /* get week number of last week of last year */
948  struct tm dec31ly; /* 12/31 last year */
949  dec31ly = *timeptr;
950  dec31ly.tm_year--;
951  dec31ly.tm_mon = 11;
952  dec31ly.tm_mday = 31;
953  dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1;
954  dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900L);
955  weeknum = iso8601wknum(& dec31ly);
956 #endif
957  }
958  break;
959  }
960 
961  if (timeptr->tm_mon == 11) {
962  /*
963  * The last week of the year
964  * can be in week 1 of next year.
965  * Sigh.
966  *
967  * This can only happen if
968  * M T W
969  * 29 30 31
970  * 30 31
971  * 31
972  */
973  int wday, mday;
974 
975  wday = timeptr->tm_wday;
976  mday = timeptr->tm_mday;
977  if ( (wday == 1 && (mday >= 29 && mday <= 31))
978  || (wday == 2 && (mday == 30 || mday == 31))
979  || (wday == 3 && mday == 31))
980  weeknum = 1;
981  }
982 
983  return weeknum;
984 }
985 
986 static int
987 iso8601wknum_v(const struct vtm *vtm)
988 {
989  struct tm tm;
990  vtm2tm_noyear(vtm, &tm);
991  return iso8601wknum(&tm);
992 }
993 
994 #endif
995 
996 /* weeknumber --- figure how many weeks into the year */
997 
998 /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */
999 
1000 static int
1001 weeknumber(const struct tm *timeptr, int firstweekday)
1002 {
1003  int wday = timeptr->tm_wday;
1004  int ret;
1005 
1006  if (firstweekday == 1) {
1007  if (wday == 0) /* sunday */
1008  wday = 6;
1009  else
1010  wday--;
1011  }
1012  ret = ((timeptr->tm_yday + 7 - wday) / 7);
1013  if (ret < 0)
1014  ret = 0;
1015  return ret;
1016 }
1017 
1018 static int
1019 weeknumber_v(const struct vtm *vtm, int firstweekday)
1020 {
1021  struct tm tm;
1022  vtm2tm_noyear(vtm, &tm);
1023  return weeknumber(&tm, firstweekday);
1024 }
1025 
1026 #if 0
1027 /* ADR --- I'm loathe to mess with ado's code ... */
1028 
1029 Date: Wed, 24 Apr 91 20:54:08 MDT
1030 From: Michal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK>
1031 To: arnold@audiofax.com
1032 
1033 Hi Arnold,
1034 in a process of fixing of strftime() in libraries on Atari ST I grabbed
1035 some pieces of code from your own strftime. When doing that it came
1036 to mind that your weeknumber() function compiles a little bit nicer
1037 in the following form:
1038 /*
1039  * firstweekday is 0 if starting in Sunday, non-zero if in Monday
1040  */
1041 {
1042  return (timeptr->tm_yday - timeptr->tm_wday +
1043  (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7;
1044 }
1045 How nicer it depends on a compiler, of course, but always a tiny bit.
1046 
1047  Cheers,
1048  Michal
1049  ntomczak@vm.ucs.ualberta.ca
1050 #endif
1051 
1052 #ifdef TEST_STRFTIME
1053 
1054 /*
1055  * NAME:
1056  * tst
1057  *
1058  * SYNOPSIS:
1059  * tst
1060  *
1061  * DESCRIPTION:
1062  * "tst" is a test driver for the function "strftime".
1063  *
1064  * OPTIONS:
1065  * None.
1066  *
1067  * AUTHOR:
1068  * Karl Vogel
1069  * Control Data Systems, Inc.
1070  * vogelke@c-17igp.wpafb.af.mil
1071  *
1072  * BUGS:
1073  * None noticed yet.
1074  *
1075  * COMPILE:
1076  * cc -o tst -DTEST_STRFTIME strftime.c
1077  */
1078 
1079 /* ADR: I reformatted this to my liking, and deleted some unneeded code. */
1080 
1081 #ifndef NULL
1082 #include <stdio.h>
1083 #endif
1084 #include <sys/time.h>
1085 #include <string.h>
1086 
1087 #define MAXTIME 132
1088 
1089 /*
1090  * Array of time formats.
1091  */
1092 
1093 static char *array[] =
1094 {
1095  "(%%A) full weekday name, var length (Sunday..Saturday) %A",
1096  "(%%B) full month name, var length (January..December) %B",
1097  "(%%C) Century %C",
1098  "(%%D) date (%%m/%%d/%%y) %D",
1099  "(%%E) Locale extensions (ignored) %E",
1100  "(%%H) hour (24-hour clock, 00..23) %H",
1101  "(%%I) hour (12-hour clock, 01..12) %I",
1102  "(%%M) minute (00..59) %M",
1103  "(%%O) Locale extensions (ignored) %O",
1104  "(%%R) time, 24-hour (%%H:%%M) %R",
1105  "(%%S) second (00..60) %S",
1106  "(%%T) time, 24-hour (%%H:%%M:%%S) %T",
1107  "(%%U) week of year, Sunday as first day of week (00..53) %U",
1108  "(%%V) week of year according to ISO 8601 %V",
1109  "(%%W) week of year, Monday as first day of week (00..53) %W",
1110  "(%%X) appropriate locale time representation (%H:%M:%S) %X",
1111  "(%%Y) year with century (1970...) %Y",
1112  "(%%Z) timezone (EDT), or blank if timezone not determinable %Z",
1113  "(%%a) locale's abbreviated weekday name (Sun..Sat) %a",
1114  "(%%b) locale's abbreviated month name (Jan..Dec) %b",
1115  "(%%c) full date (Sat Nov 4 12:02:33 1989)%n%t%t%t %c",
1116  "(%%d) day of the month (01..31) %d",
1117  "(%%e) day of the month, blank-padded ( 1..31) %e",
1118  "(%%h) should be same as (%%b) %h",
1119  "(%%j) day of the year (001..366) %j",
1120  "(%%k) hour, 24-hour clock, blank pad ( 0..23) %k",
1121  "(%%l) hour, 12-hour clock, blank pad ( 1..12) %l",
1122  "(%%m) month (01..12) %m",
1123  "(%%p) locale's AM or PM based on 12-hour clock %p",
1124  "(%%r) time, 12-hour (same as %%I:%%M:%%S %%p) %r",
1125  "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7] %u",
1126  "(%%v) VMS date (dd-bbb-YYYY) %v",
1127  "(%%w) day of week (0..6, Sunday == 0) %w",
1128  "(%%x) appropriate locale date representation %x",
1129  "(%%y) last two digits of year (00..99) %y",
1130  "(%%z) timezone offset east of GMT as HHMM (e.g. -0500) %z",
1131  (char *) NULL
1132 };
1133 
1134 /* main routine. */
1135 
1136 int
1137 main(int argc, char **argv)
1138 {
1139  long time();
1140 
1141  char *next;
1142  char string[MAXTIME];
1143 
1144  int k;
1145  int length;
1146 
1147  struct tm *tm;
1148 
1149  long clock;
1150 
1151  /* Call the function. */
1152 
1153  clock = time((long *) 0);
1154  tm = localtime(&clock);
1155 
1156  for (k = 0; next = array[k]; k++) {
1157  length = strftime(string, MAXTIME, next, tm);
1158  printf("%s\n", string);
1159  }
1160 
1161  exit(0);
1162 }
1163 #endif /* TEST_STRFTIME */
int yday
Definition: timev.h:14
#define NEEDS(n)
VP_EXPORT int
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code
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VALUE year
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Definition: strftime.c:987
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i
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Definition: ripper.y:169
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Definition: enum.c:67
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static VALUE char * str
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Definition: ripper.y:170
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#define INT2FIX(i)
#define FIX2LONG(x)
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Definition: ruby.h:1779
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Definition: win32.c:114
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Definition: timev.h:12
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Definition: strftime.c:837
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VALUE rb_str_format(int, const VALUE *, VALUE)
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volatile VALUE result
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#define I(x, y, z)
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