Ruby  2.0.0p648(2015-12-16revision53162)
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  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) {
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 */
int yday
Definition: timev.h:14
#define NEEDS(n)
size_t strlen(const char *)
int i
Definition: win32ole.c:784
#define NUM2INT(x)
Definition: ruby.h:622
static int max(int a, int b)
Definition: strftime.c:141
const char * zone
Definition: timev.h:16
static int isleap(long year)
Definition: strftime.c:844
VALUE year
Definition: timev.h:5
static int iso8601wknum_v(const struct vtm *vtm)
Definition: strftime.c:986
static size_t 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)
Definition: strftime.c:165
#define add(x, y)
Definition: strftime.c:150
VALUE rb_funcall(VALUE, ID, int,...)
Calls a method.
Definition: vm_eval.c:773
#define mod(x, y)
Definition: strftime.c:155
#define adddecl(stuff)
Definition: strftime.c:94
#define FIXNUM_P(f)
Definition: ruby.h:355
int min
Definition: timev.h:9
VALUE rb_str_conv_enc_opts(VALUE str, rb_encoding *from, rb_encoding *to, int ecflags, VALUE ecopts)
time_t tv_sec
Definition: missing.h:46
int args
Definition: win32ole.c:785
#define PRI_TIMET_PREFIX
Definition: ruby.h:155
size_t rb_strftime_timespec(char *s, size_t maxsize, const char *format, rb_encoding *enc, const struct vtm *vtm, struct timespec *ts, int gmt)
Definition: strftime.c:836
#define STRFTIME(fmt)
Definition: timev.h:4
#define ECONV_INVALID_REPLACE
Definition: encoding.h:310
#define FLAG_FOUND()
#define snprintf
Definition: subst.h:6
long tv_nsec
Definition: missing.h:47
#define TOUPPER(c)
Definition: ruby.h:1640
#define div(x, y)
Definition: strftime.c:154
#define range(low, item, hi)
int argc
Definition: ruby.c:130
#define realloc
Definition: ripper.c:99
#define ISUPPER(c)
Definition: ruby.h:1633
int err
Definition: win32.c:87
#define ISLOWER(c)
Definition: ruby.h:1634
VALUE utc_offset
Definition: timev.h:12
static int weeknumber()
int errno
size_t rb_strftime(char *s, size_t maxsize, const char *format, rb_encoding *enc, const struct vtm *vtm, VALUE timev, int gmt)
Definition: strftime.c:830
VALUE rb_str_format(int, const VALUE *, VALUE)
Definition: sprintf.c:443
#define malloc
Definition: ripper.c:98
rb_encoding * rb_usascii_encoding(void)
Definition: encoding.c:1181
#define Qnil
Definition: ruby.h:435
#define TBUFSIZE
unsigned long VALUE
Definition: ruby.h:104
rb_encoding * rb_locale_encoding(void)
Definition: encoding.c:1212
static VALUE result
Definition: nkf.c:40
char * strchr(char *, char)
#define FIX2INT(x)
Definition: ruby.h:624
#define FILL_PADDING(i)
char * getenv()
RUBY_EXTERN size_t strlcpy(char *, const char *, size_t)
Definition: strlcpy.c:44
VALUE rb_str_new_cstr(const char *)
Definition: string.c:447
int mon
Definition: timev.h:6
#define StringValueCStr(v)
Definition: ruby.h:548
static void vtm2tm_noyear(const struct vtm *vtm, struct tm *result)
Definition: strftime.c:851
#define RSTRING_PTR(str)
Definition: ruby.h:866
#define ECONV_UNDEF_REPLACE
Definition: encoding.h:313
static int weeknumber_v(const struct vtm *vtm, int firstweekday)
Definition: strftime.c:1018
#define sub(x, y)
Definition: strftime.c:151
#define INT2FIX(i)
Definition: ruby.h:241
#define mul(x, y)
Definition: strftime.c:152
static int iso8601wknum(const struct tm *timeptr)
Definition: strftime.c:879
int isdst
Definition: timev.h:15
#define FMT(def_pad, def_prec, fmt, val)
#define TOLOWER(c)
Definition: ruby.h:1641
int main(int argc, char **argv)
Definition: nkf.c:6918
int hour
Definition: timev.h:8
int mday
Definition: timev.h:7
int sec
Definition: timev.h:10
rb_encoding * rb_ascii8bit_encoding(void)
Definition: encoding.c:1151
#define FMTV(def_pad, def_prec, fmt, val)
#define BIT_OF(n)
int wday
Definition: timev.h:13
#define rb_intern(str)
#define NULL
Definition: _sdbm.c:102
#define FIX2LONG(x)
Definition: ruby.h:353
VALUE rb_str_new2(const char *)
#define I(x, y, z)
#define NUM2LONG(x)
Definition: ruby.h:592
char ** argv
Definition: ruby.c:131