Ruby  2.7.2p137(2020-10-01revision5445e0435260b449decf2ac16f9d09bae3cafe72)
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 #include "internal.h"
54 
55 #ifndef GAWK
56 #include <stdio.h>
57 #include <ctype.h>
58 #include <string.h>
59 #include <time.h>
60 #include <sys/types.h>
61 #include <errno.h>
62 #endif
63 #if defined(TM_IN_SYS_TIME) || !defined(GAWK)
64 #include <sys/types.h>
65 #if HAVE_SYS_TIME_H
66 #include <sys/time.h>
67 #endif
68 #endif
69 #include <math.h>
70 
71 /* defaults: season to taste */
72 #define SYSV_EXT 1 /* stuff in System V ascftime routine */
73 #define SUNOS_EXT 1 /* stuff in SunOS strftime routine */
74 #define POSIX2_DATE 1 /* stuff in Posix 1003.2 date command */
75 #define VMS_EXT 1 /* include %v for VMS date format */
76 #define MAILHEADER_EXT 1 /* add %z for HHMM format */
77 #define ISO_DATE_EXT 1 /* %G and %g for year of ISO week */
78 
79 #if defined(ISO_DATE_EXT)
80 #if ! defined(POSIX2_DATE)
81 #define POSIX2_DATE 1
82 #endif
83 #endif
84 
85 #if defined(POSIX2_DATE)
86 #if ! defined(SYSV_EXT)
87 #define SYSV_EXT 1
88 #endif
89 #if ! defined(SUNOS_EXT)
90 #define SUNOS_EXT 1
91 #endif
92 #endif
93 
94 #if defined(POSIX2_DATE)
95 #define adddecl(stuff) stuff
96 #else
97 #define adddecl(stuff)
98 #endif
99 
100 #undef strchr /* avoid AIX weirdness */
101 
102 #if !defined __STDC__ && !defined _WIN32
103 #define const
104 static int weeknumber();
105 adddecl(static int iso8601wknum();)
106 static int weeknumber_v();
107 adddecl(static int iso8601wknum_v();)
108 #else
109 static int weeknumber(const struct tm *timeptr, int firstweekday);
110 adddecl(static int iso8601wknum(const struct tm *timeptr);)
111 static int weeknumber_v(const struct vtm *vtm, int firstweekday);
112 adddecl(static int iso8601wknum_v(const struct vtm *vtm);)
113 #endif
114 
115 #ifdef STDC_HEADERS
116 #include <stdlib.h>
117 #include <string.h>
118 #else
119 extern void *malloc();
120 extern void *realloc();
121 extern char *getenv();
122 extern char *strchr();
123 #endif
124 
125 #define range(low, item, hi) max((low), min((item), (hi)))
126 
127 #undef min /* just in case */
128 
129 /* min --- return minimum of two numbers */
130 
131 static inline int
132 min(int a, int b)
133 {
134  return (a < b ? a : b);
135 }
136 
137 #undef max /* also, just in case */
138 
139 /* max --- return maximum of two numbers */
140 
141 static inline int
142 max(int a, int b)
143 {
144  return (a > b ? a : b);
145 }
146 
147 #ifdef NO_STRING_LITERAL_CONCATENATION
148 #error No string literal concatenation
149 #endif
150 
151 #define add(x,y) (rb_funcall((x), '+', 1, (y)))
152 #define sub(x,y) (rb_funcall((x), '-', 1, (y)))
153 #define mul(x,y) (rb_funcall((x), '*', 1, (y)))
154 #define quo(x,y) (rb_funcall((x), rb_intern("quo"), 1, (y)))
155 #define div(x,y) (rb_funcall((x), rb_intern("div"), 1, (y)))
156 #define mod(x,y) (rb_funcall((x), '%', 1, (y)))
157 
158 /* strftime --- produce formatted time */
159 
160 enum {LEFT, CHCASE, LOWER, UPPER};
161 #define BIT_OF(n) (1U<<(n))
162 
163 static char *
164 resize_buffer(VALUE ftime, char *s, const char **start, const char **endp,
165  ptrdiff_t n, size_t maxsize)
166 {
167  size_t len = s - *start;
168  size_t nlen = len + n * 2;
169 
170  if (nlen < len || nlen > maxsize) {
171  return 0;
172  }
173  rb_str_set_len(ftime, len);
174  rb_str_modify_expand(ftime, nlen-len);
175  s = RSTRING_PTR(ftime);
176  *endp = s + nlen;
177  *start = s;
178  return s += len;
179 }
180 
181 static void
182 buffer_size_check(const char *s,
183  const char *format_end, size_t format_len,
184  rb_encoding *enc)
185 {
186  if (!s) {
187  const char *format = format_end-format_len;
188  VALUE fmt = rb_enc_str_new(format, format_len, enc);
190  }
191 }
192 
193 static char *
194 case_conv(char *s, ptrdiff_t i, int flags)
195 {
196  switch (flags & (BIT_OF(UPPER)|BIT_OF(LOWER))) {
197  case BIT_OF(UPPER):
198  do {
199  if (ISLOWER(*s)) *s = TOUPPER(*s);
200  } while (s++, --i);
201  break;
202  case BIT_OF(LOWER):
203  do {
204  if (ISUPPER(*s)) *s = TOLOWER(*s);
205  } while (s++, --i);
206  break;
207  default:
208  s += i;
209  break;
210  }
211  return s;
212 }
213 
214 static VALUE
215 format_value(VALUE val, int base)
216 {
217  if (!RB_TYPE_P(val, T_BIGNUM))
218  val = rb_Integer(val);
219  return rb_big2str(val, base);
220 }
221 
222 /*
223  * enc is the encoding of the format. It is used as the encoding of resulted
224  * string, but the name of the month and weekday are always US-ASCII. So it
225  * is only used for the timezone name on Windows.
226  */
227 static VALUE
228 rb_strftime_with_timespec(VALUE ftime, const char *format, size_t format_len,
229  rb_encoding *enc, VALUE time, const struct vtm *vtm,
230  VALUE timev, struct timespec *ts, int gmt, size_t maxsize)
231 {
232  size_t len = RSTRING_LEN(ftime);
233  char *s = RSTRING_PTR(ftime);
234  const char *start = s;
235  const char *endp = start + rb_str_capacity(ftime);
236  const char *const format_end = format + format_len;
237  const char *sp, *tp;
238 #define TBUFSIZE 100
239  auto char tbuf[TBUFSIZE];
240  long off;
241  ptrdiff_t i;
242  int w;
243  long y;
244  int precision, flags, colons;
245  char padding;
246 #ifdef MAILHEADER_EXT
247  int sign;
248 #endif
249  VALUE zone = Qnil;
250 
251  /* various tables, useful in North America */
252  static const char days_l[][10] = {
253  "Sunday", "Monday", "Tuesday", "Wednesday",
254  "Thursday", "Friday", "Saturday",
255  };
256  static const char months_l[][10] = {
257  "January", "February", "March", "April",
258  "May", "June", "July", "August", "September",
259  "October", "November", "December",
260  };
261  static const char ampm[][3] = { "AM", "PM", };
262 
263  if (format == NULL || format_len == 0 || vtm == NULL) {
264  err:
265  return 0;
266  }
267 
268  if (enc &&
269  (enc == rb_usascii_encoding() ||
270  enc == rb_ascii8bit_encoding() ||
271  enc == rb_locale_encoding())) {
272  enc = NULL;
273  }
274 
275  s += len;
276  for (; format < format_end; format++) {
277 #define FLAG_FOUND() do { \
278  if (precision > 0) \
279  goto unknown; \
280  } while (0)
281 #define NEEDS(n) do { \
282  if (s >= endp || (n) >= endp - s - 1) { \
283  s = resize_buffer(ftime, s, &start, &endp, (n), maxsize); \
284  buffer_size_check(s, format_end, format_len, enc); \
285  } \
286  } while (0)
287 #define FILL_PADDING(i) do { \
288  if (!(flags & BIT_OF(LEFT)) && precision > (i)) { \
289  NEEDS(precision); \
290  memset(s, padding ? padding : ' ', precision - (i)); \
291  s += precision - (i); \
292  } \
293  else { \
294  NEEDS(i); \
295  } \
296 } while (0);
297 #define FMT_PADDING(fmt, def_pad) \
298  (&"%*"fmt"\0""%0*"fmt[\
299  (padding == '0' || (!padding && (def_pad) == '0')) ? \
300  rb_strlen_lit("%*"fmt)+1 : 0])
301 #define FMT_PRECISION(def_prec) \
302  ((flags & BIT_OF(LEFT)) ? (1) : \
303  (precision <= 0) ? (def_prec) : (precision))
304 #define FMT(def_pad, def_prec, fmt, val) \
305  do { \
306  precision = FMT_PRECISION(def_prec); \
307  len = s - start; \
308  NEEDS(precision); \
309  rb_str_set_len(ftime, len); \
310  rb_str_catf(ftime, FMT_PADDING(fmt, def_pad), \
311  precision, (val)); \
312  RSTRING_GETMEM(ftime, s, len); \
313  endp = (start = s) + rb_str_capacity(ftime); \
314  s += len; \
315  } while (0)
316 #define STRFTIME(fmt) \
317  do { \
318  len = s - start; \
319  rb_str_set_len(ftime, len); \
320  if (!rb_strftime_with_timespec(ftime, (fmt), rb_strlen_lit(fmt), \
321  enc, time, vtm, timev, ts, gmt, maxsize)) \
322  return 0; \
323  s = RSTRING_PTR(ftime); \
324  i = RSTRING_LEN(ftime) - len; \
325  endp = (start = s) + rb_str_capacity(ftime); \
326  s += len; \
327  if (i > 0) case_conv(s, i, flags); \
328  if (precision > i) {\
329  s += i; \
330  NEEDS(precision); \
331  s -= i; \
332  memmove(s + precision - i, s, i);\
333  memset(s, padding ? padding : ' ', precision - i); \
334  s += precision; \
335  } \
336  else s += i; \
337  } while (0)
338 #define FMTV(def_pad, def_prec, fmt, val) \
339  do { \
340  VALUE tmp = (val); \
341  if (FIXNUM_P(tmp)) { \
342  FMT((def_pad), (def_prec), "l"fmt, FIX2LONG(tmp)); \
343  } \
344  else { \
345  const int base = ((fmt[0] == 'x') ? 16 : \
346  (fmt[0] == 'o') ? 8 : \
347  10); \
348  precision = FMT_PRECISION(def_prec); \
349  if (!padding) padding = (def_pad); \
350  tmp = format_value(tmp, base); \
351  i = RSTRING_LEN(tmp); \
352  FILL_PADDING(i); \
353  rb_str_set_len(ftime, s-start); \
354  rb_str_append(ftime, tmp); \
355  RSTRING_GETMEM(ftime, s, len); \
356  endp = (start = s) + rb_str_capacity(ftime); \
357  s += len; \
358  } \
359  } while (0)
360 
361  tp = memchr(format, '%', format_end - format);
362  if (!tp) tp = format_end;
363  NEEDS(tp - format);
364  memcpy(s, format, tp - format);
365  s += tp - format;
366  format = tp;
367  if (format == format_end) break;
368 
369  tp = tbuf;
370  sp = format;
371  precision = -1;
372  flags = 0;
373  padding = 0;
374  colons = 0;
375  again:
376  if (++format >= format_end) goto unknown;
377  switch (*format) {
378  case '%':
379  FILL_PADDING(1);
380  *s++ = '%';
381  continue;
382 
383  case 'a': /* abbreviated weekday name */
384  if (flags & BIT_OF(CHCASE)) {
385  flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
386  flags |= BIT_OF(UPPER);
387  }
388  if (vtm->wday < 0 || vtm->wday > 6)
389  i = 1, tp = "?";
390  else
391  i = 3, tp = days_l[vtm->wday];
392  break;
393 
394  case 'A': /* full weekday name */
395  if (flags & BIT_OF(CHCASE)) {
396  flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
397  flags |= BIT_OF(UPPER);
398  }
399  if (vtm->wday < 0 || vtm->wday > 6)
400  i = 1, tp = "?";
401  else
402  i = strlen(tp = days_l[vtm->wday]);
403  break;
404 
405 #ifdef SYSV_EXT
406  case 'h': /* abbreviated month name */
407 #endif
408  case 'b': /* abbreviated month name */
409  if (flags & BIT_OF(CHCASE)) {
410  flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
411  flags |= BIT_OF(UPPER);
412  }
413  if (vtm->mon < 1 || vtm->mon > 12)
414  i = 1, tp = "?";
415  else
416  i = 3, tp = months_l[vtm->mon-1];
417  break;
418 
419  case 'B': /* full month name */
420  if (flags & BIT_OF(CHCASE)) {
421  flags &= ~(BIT_OF(LOWER)|BIT_OF(CHCASE));
422  flags |= BIT_OF(UPPER);
423  }
424  if (vtm->mon < 1 || vtm->mon > 12)
425  i = 1, tp = "?";
426  else
427  i = strlen(tp = months_l[vtm->mon-1]);
428  break;
429 
430  case 'c': /* appropriate date and time representation */
431  STRFTIME("%a %b %e %H:%M:%S %Y");
432  continue;
433 
434  case 'd': /* day of the month, 01 - 31 */
435  i = range(1, vtm->mday, 31);
436  FMT('0', 2, "d", (int)i);
437  continue;
438 
439  case 'H': /* hour, 24-hour clock, 00 - 23 */
440  i = range(0, vtm->hour, 23);
441  FMT('0', 2, "d", (int)i);
442  continue;
443 
444  case 'I': /* hour, 12-hour clock, 01 - 12 */
445  i = range(0, vtm->hour, 23);
446  if (i == 0)
447  i = 12;
448  else if (i > 12)
449  i -= 12;
450  FMT('0', 2, "d", (int)i);
451  continue;
452 
453  case 'j': /* day of the year, 001 - 366 */
454  i = range(1, vtm->yday, 366);
455  FMT('0', 3, "d", (int)i);
456  continue;
457 
458  case 'm': /* month, 01 - 12 */
459  i = range(1, vtm->mon, 12);
460  FMT('0', 2, "d", (int)i);
461  continue;
462 
463  case 'M': /* minute, 00 - 59 */
464  i = range(0, vtm->min, 59);
465  FMT('0', 2, "d", (int)i);
466  continue;
467 
468  case 'p': /* AM or PM based on 12-hour clock */
469  case 'P': /* am or pm based on 12-hour clock */
470  if ((*format == 'p' && (flags & BIT_OF(CHCASE))) ||
471  (*format == 'P' && !(flags & (BIT_OF(CHCASE)|BIT_OF(UPPER))))) {
472  flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
473  flags |= BIT_OF(LOWER);
474  }
475  i = range(0, vtm->hour, 23);
476  if (i < 12)
477  tp = ampm[0];
478  else
479  tp = ampm[1];
480  i = 2;
481  break;
482 
483  case 's':
484  if (ts) {
485  time_t sec = ts->tv_sec;
486  if (~(time_t)0 <= 0)
487  FMT('0', 1, PRI_TIMET_PREFIX"d", sec);
488  else
489  FMT('0', 1, PRI_TIMET_PREFIX"u", sec);
490  }
491  else {
492  VALUE sec = div(timev, INT2FIX(1));
493  FMTV('0', 1, "d", sec);
494  }
495  continue;
496 
497  case 'S': /* second, 00 - 60 */
498  i = range(0, vtm->sec, 60);
499  FMT('0', 2, "d", (int)i);
500  continue;
501 
502  case 'U': /* week of year, Sunday is first day of week */
503  FMT('0', 2, "d", weeknumber_v(vtm, 0));
504  continue;
505 
506  case 'w': /* weekday, Sunday == 0, 0 - 6 */
507  i = range(0, vtm->wday, 6);
508  FMT('0', 1, "d", (int)i);
509  continue;
510 
511  case 'W': /* week of year, Monday is first day of week */
512  FMT('0', 2, "d", weeknumber_v(vtm, 1));
513  continue;
514 
515  case 'x': /* appropriate date representation */
516  STRFTIME("%m/%d/%y");
517  continue;
518 
519  case 'X': /* appropriate time representation */
520  STRFTIME("%H:%M:%S");
521  continue;
522 
523  case 'y': /* year without a century, 00 - 99 */
524  i = NUM2INT(mod(vtm->year, INT2FIX(100)));
525  FMT('0', 2, "d", (int)i);
526  continue;
527 
528  case 'Y': /* year with century */
529  if (FIXNUM_P(vtm->year)) {
530  long y = FIX2LONG(vtm->year);
531  FMT('0', 0 <= y ? 4 : 5, "ld", y);
532  }
533  else {
534  FMTV('0', 4, "d", vtm->year);
535  }
536  continue;
537 
538 #ifdef MAILHEADER_EXT
539  case 'z': /* time zone offset east of GMT e.g. -0600 */
540  if (gmt) {
541  off = 0;
542  }
543  else {
544  off = NUM2LONG(rb_funcall(vtm->utc_offset, rb_intern("round"), 0));
545  }
546  if (off < 0) {
547  off = -off;
548  sign = -1;
549  }
550  else {
551  sign = +1;
552  }
553  switch (colons) {
554  case 0: /* %z -> +hhmm */
555  precision = precision <= 5 ? 2 : precision-3;
556  NEEDS(precision + 3);
557  break;
558 
559  case 1: /* %:z -> +hh:mm */
560  precision = precision <= 6 ? 2 : precision-4;
561  NEEDS(precision + 4);
562  break;
563 
564  case 2: /* %::z -> +hh:mm:ss */
565  precision = precision <= 9 ? 2 : precision-7;
566  NEEDS(precision + 7);
567  break;
568 
569  case 3: /* %:::z -> +hh[:mm[:ss]] */
570  if (off % 3600 == 0) {
571  precision = precision <= 3 ? 2 : precision-1;
572  NEEDS(precision + 3);
573  }
574  else if (off % 60 == 0) {
575  precision = precision <= 6 ? 2 : precision-4;
576  NEEDS(precision + 4);
577  }
578  else {
579  precision = precision <= 9 ? 2 : precision-7;
580  NEEDS(precision + 9);
581  }
582  break;
583 
584  default:
585  format--;
586  goto unknown;
587  }
588  i = snprintf(s, endp - s, (padding == ' ' ? "%+*ld" : "%+.*ld"),
589  precision + (padding == ' '), sign * (off / 3600));
590  if (i < 0) goto err;
591  if (sign < 0 && off < 3600) {
592  *(padding == ' ' ? s + i - 2 : s) = '-';
593  }
594  s += i;
595  off = off % 3600;
596  if (colons == 3 && off == 0)
597  continue;
598  if (1 <= colons)
599  *s++ = ':';
600  i = snprintf(s, endp - s, "%02d", (int)(off / 60));
601  if (i < 0) goto err;
602  s += i;
603  off = off % 60;
604  if (colons == 3 && off == 0)
605  continue;
606  if (2 <= colons) {
607  *s++ = ':';
608  i = snprintf(s, endp - s, "%02d", (int)off);
609  if (i < 0) goto err;
610  s += i;
611  }
612  continue;
613 #endif /* MAILHEADER_EXT */
614 
615  case 'Z': /* time zone name or abbreviation */
616  if (flags & BIT_OF(CHCASE)) {
617  flags &= ~(BIT_OF(UPPER)|BIT_OF(CHCASE));
618  flags |= BIT_OF(LOWER);
619  }
620  if (gmt) {
621  i = 3;
622  tp = "UTC";
623  break;
624  }
625  if (NIL_P(vtm->zone)) {
626  i = 0;
627  }
628  else {
629  if (NIL_P(zone)) {
630  zone = rb_time_zone_abbreviation(vtm->zone, time);
631  }
632  tp = RSTRING_PTR(zone);
633  if (enc) {
634  for (i = 0; i < TBUFSIZE && tp[i]; i++) {
635  if ((unsigned char)tp[i] > 0x7F) {
637  i = strlcpy(tbuf, RSTRING_PTR(str), TBUFSIZE);
638  tp = tbuf;
639  break;
640  }
641  }
642  }
643  else
644  i = strlen(tp);
645  }
646  break;
647 
648 #ifdef SYSV_EXT
649  case 'n': /* same as \n */
650  FILL_PADDING(1);
651  *s++ = '\n';
652  continue;
653 
654  case 't': /* same as \t */
655  FILL_PADDING(1);
656  *s++ = '\t';
657  continue;
658 
659  case 'D': /* date as %m/%d/%y */
660  STRFTIME("%m/%d/%y");
661  continue;
662 
663  case 'e': /* day of month, blank padded */
664  FMT(' ', 2, "d", range(1, vtm->mday, 31));
665  continue;
666 
667  case 'r': /* time as %I:%M:%S %p */
668  STRFTIME("%I:%M:%S %p");
669  continue;
670 
671  case 'R': /* time as %H:%M */
672  STRFTIME("%H:%M");
673  continue;
674 
675  case 'T': /* time as %H:%M:%S */
676  STRFTIME("%H:%M:%S");
677  continue;
678 #endif
679 
680 #ifdef SUNOS_EXT
681  case 'k': /* hour, 24-hour clock, blank pad */
682  i = range(0, vtm->hour, 23);
683  FMT(' ', 2, "d", (int)i);
684  continue;
685 
686  case 'l': /* hour, 12-hour clock, 1 - 12, blank pad */
687  i = range(0, vtm->hour, 23);
688  if (i == 0)
689  i = 12;
690  else if (i > 12)
691  i -= 12;
692  FMT(' ', 2, "d", (int)i);
693  continue;
694 #endif
695 
696 
697 #ifdef VMS_EXT
698  case 'v': /* date as dd-bbb-YYYY */
699  STRFTIME("%e-%^b-%4Y");
700  continue;
701 #endif
702 
703 
704 #ifdef POSIX2_DATE
705  case 'C':
706  FMTV('0', 2, "d", div(vtm->year, INT2FIX(100)));
707  continue;
708 
709  case 'E':
710  /* POSIX locale extensions, ignored for now */
711  if (!format[1] || !strchr("cCxXyY", format[1]))
712  goto unknown;
713  goto again;
714  case 'O':
715  /* POSIX locale extensions, ignored for now */
716  if (!format[1] || !strchr("deHkIlmMSuUVwWy", format[1]))
717  goto unknown;
718  goto again;
719 
720  case 'V': /* week of year according ISO 8601 */
721  FMT('0', 2, "d", iso8601wknum_v(vtm));
722  continue;
723 
724  case 'u':
725  /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */
726  FMT('0', 1, "d", vtm->wday == 0 ? 7 : vtm->wday);
727  continue;
728 #endif /* POSIX2_DATE */
729 
730 #ifdef ISO_DATE_EXT
731  case 'G':
732  case 'g':
733  /*
734  * Year of ISO week.
735  *
736  * If it's December but the ISO week number is one,
737  * that week is in next year.
738  * If it's January but the ISO week number is 52 or
739  * 53, that week is in last year.
740  * Otherwise, it's this year.
741  */
742  {
743  VALUE yv = vtm->year;
744  w = iso8601wknum_v(vtm);
745  if (vtm->mon == 12 && w == 1)
746  yv = add(yv, INT2FIX(1));
747  else if (vtm->mon == 1 && w >= 52)
748  yv = sub(yv, INT2FIX(1));
749 
750  if (*format == 'G') {
751  if (FIXNUM_P(yv)) {
752  const long y = FIX2LONG(yv);
753  FMT('0', 0 <= y ? 4 : 5, "ld", y);
754  }
755  else {
756  FMTV('0', 4, "d", yv);
757  }
758  }
759  else {
760  yv = mod(yv, INT2FIX(100));
761  y = FIX2LONG(yv);
762  FMT('0', 2, "ld", y);
763  }
764  continue;
765  }
766 
767 #endif /* ISO_DATE_EXT */
768 
769 
770  case 'L':
771  w = 3;
772  goto subsec;
773 
774  case 'N':
775  /*
776  * fractional second digits. default is 9 digits
777  * (nanosecond).
778  *
779  * %3N millisecond (3 digits)
780  * %6N microsecond (6 digits)
781  * %9N nanosecond (9 digits)
782  */
783  w = 9;
784  subsec:
785  if (precision <= 0) {
786  precision = w;
787  }
788  NEEDS(precision);
789 
790  if (ts) {
791  long subsec = ts->tv_nsec;
792  if (9 < precision) {
793  snprintf(s, endp - s, "%09ld", subsec);
794  memset(s+9, '0', precision-9);
795  s += precision;
796  }
797  else {
798  int i;
799  for (i = 0; i < 9-precision; i++)
800  subsec /= 10;
801  snprintf(s, endp - s, "%0*ld", precision, subsec);
802  s += precision;
803  }
804  }
805  else {
806  VALUE subsec = mod(timev, INT2FIX(1));
807  int ww;
808  long n;
809 
810  ww = precision;
811  while (9 <= ww) {
812  subsec = mul(subsec, INT2FIX(1000000000));
813  ww -= 9;
814  }
815  n = 1;
816  for (; 0 < ww; ww--)
817  n *= 10;
818  if (n != 1)
819  subsec = mul(subsec, INT2FIX(n));
820  subsec = div(subsec, INT2FIX(1));
821 
822  if (FIXNUM_P(subsec)) {
823  (void)snprintf(s, endp - s, "%0*ld", precision, FIX2LONG(subsec));
824  s += precision;
825  }
826  else {
827  VALUE args[2], result;
828  args[0] = INT2FIX(precision);
829  args[1] = subsec;
830  result = rb_str_format(2, args,
831  rb_fstring_lit("%0*d"));
832  (void)strlcpy(s, StringValueCStr(result), endp-s);
833  s += precision;
834  }
835  }
836  continue;
837 
838  case 'F': /* Equivalent to %Y-%m-%d */
839  STRFTIME("%Y-%m-%d");
840  continue;
841 
842  case '-':
843  FLAG_FOUND();
844  flags |= BIT_OF(LEFT);
845  padding = precision = 0;
846  goto again;
847 
848  case '^':
849  FLAG_FOUND();
850  flags |= BIT_OF(UPPER);
851  goto again;
852 
853  case '#':
854  FLAG_FOUND();
855  flags |= BIT_OF(CHCASE);
856  goto again;
857 
858  case '_':
859  FLAG_FOUND();
860  padding = ' ';
861  goto again;
862 
863  case ':':
864  for (colons = 1; colons <= 3; ++colons) {
865  if (format+colons >= format_end) goto unknown;
866  if (format[colons] == 'z') break;
867  if (format[colons] != ':') goto unknown;
868  }
869  format += colons - 1;
870  goto again;
871 
872  case '0':
873  padding = '0';
874  case '1': case '2': case '3': case '4':
875  case '5': case '6': case '7': case '8': case '9':
876  {
877  size_t n;
878  int ov;
879  unsigned long u = ruby_scan_digits(format, format_end-format, 10, &n, &ov);
880  if (ov || u > INT_MAX) goto unknown;
881  precision = (int)u;
882  format += n - 1;
883  goto again;
884  }
885 
886  default:
887  unknown:
888  i = format - sp + 1;
889  tp = sp;
890  precision = -1;
891  flags = 0;
892  padding = 0;
893  colons = 0;
894  break;
895  }
896  if (i) {
897  FILL_PADDING(i);
898  memcpy(s, tp, i);
899  s = case_conv(s, i, flags);
900  }
901  }
902  if (format != format_end) {
903  return 0;
904  }
905  len = s - start;
906  rb_str_set_len(ftime, len);
907  rb_str_resize(ftime, len);
908  return ftime;
909 }
910 
911 static size_t
912 strftime_size_limit(size_t format_len)
913 {
914  size_t limit = format_len * (1*1024*1024);
915  if (limit < format_len) limit = format_len;
916  else if (limit < 1024) limit = 1024;
917  return limit;
918 }
919 
920 VALUE
921 rb_strftime(const char *format, size_t format_len, rb_encoding *enc,
922  VALUE time, const struct vtm *vtm, VALUE timev, int gmt)
923 {
924  VALUE result = rb_enc_str_new(0, 0, enc);
925  return rb_strftime_with_timespec(result, format, format_len, enc,
926  time, vtm, timev, NULL, gmt,
927  strftime_size_limit(format_len));
928 }
929 
930 VALUE
931 rb_strftime_timespec(const char *format, size_t format_len, rb_encoding *enc,
932  VALUE time, const struct vtm *vtm, struct timespec *ts, int gmt)
933 {
934  VALUE result = rb_enc_str_new(0, 0, enc);
935  return rb_strftime_with_timespec(result, format, format_len, enc,
936  time, vtm, Qnil, ts, gmt,
937  strftime_size_limit(format_len));
938 }
939 
940 #if 0
941 VALUE
942 rb_strftime_limit(const char *format, size_t format_len, rb_encoding *enc,
943  VALUE time, const struct vtm *vtm, struct timespec *ts,
944  int gmt, size_t maxsize)
945 {
946  VALUE result = rb_enc_str_new(0, 0, enc);
947  return rb_strftime_with_timespec(result, format, format_len, enc,
948  time, vtm, Qnil, ts, gmt, maxsize);
949 }
950 #endif
951 
952 /* isleap --- is a year a leap year? */
953 
954 static int
955 isleap(long year)
956 {
957  return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
958 }
959 
960 
961 static void
962 vtm2tm_noyear(const struct vtm *vtm, struct tm *result)
963 {
964  struct tm tm;
965 
966  /* for isleap() in iso8601wknum. +100 is -1900 (mod 400). */
967  tm.tm_year = FIX2INT(mod(vtm->year, INT2FIX(400))) + 100;
968 
969  tm.tm_mon = vtm->mon-1;
970  tm.tm_mday = vtm->mday;
971  tm.tm_hour = vtm->hour;
972  tm.tm_min = vtm->min;
973  tm.tm_sec = vtm->sec;
974  tm.tm_wday = vtm->wday;
975  tm.tm_yday = vtm->yday-1;
976  tm.tm_isdst = vtm->isdst;
977 #if defined(HAVE_STRUCT_TM_TM_GMTOFF)
978  tm.tm_gmtoff = NUM2LONG(vtm->utc_offset);
979 #endif
980 #if defined(HAVE_TM_ZONE)
981  tm.tm_zone = (char *)vtm->zone;
982 #endif
983  *result = tm;
984 }
985 
986 #ifdef POSIX2_DATE
987 /* iso8601wknum --- compute week number according to ISO 8601 */
988 
989 static int
990 iso8601wknum(const struct tm *timeptr)
991 {
992  /*
993  * From 1003.2:
994  * If the week (Monday to Sunday) containing January 1
995  * has four or more days in the new year, then it is week 1;
996  * otherwise it is the highest numbered week of the previous
997  * year (52 or 53), and the next week is week 1.
998  *
999  * ADR: This means if Jan 1 was Monday through Thursday,
1000  * it was week 1, otherwise week 52 or 53.
1001  *
1002  * XPG4 erroneously included POSIX.2 rationale text in the
1003  * main body of the standard. Thus it requires week 53.
1004  */
1005 
1006  int weeknum, jan1day;
1007 
1008  /* get week number, Monday as first day of the week */
1009  weeknum = weeknumber(timeptr, 1);
1010 
1011  /*
1012  * With thanks and tip of the hatlo to tml@tik.vtt.fi
1013  *
1014  * What day of the week does January 1 fall on?
1015  * We know that
1016  * (timeptr->tm_yday - jan1.tm_yday) MOD 7 ==
1017  * (timeptr->tm_wday - jan1.tm_wday) MOD 7
1018  * and that
1019  * jan1.tm_yday == 0
1020  * and that
1021  * timeptr->tm_wday MOD 7 == timeptr->tm_wday
1022  * from which it follows that. . .
1023  */
1024  jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7);
1025  if (jan1day < 0)
1026  jan1day += 7;
1027 
1028  /*
1029  * If Jan 1 was a Monday through Thursday, it was in
1030  * week 1. Otherwise it was last year's highest week, which is
1031  * this year's week 0.
1032  *
1033  * What does that mean?
1034  * If Jan 1 was Monday, the week number is exactly right, it can
1035  * never be 0.
1036  * If it was Tuesday through Thursday, the weeknumber is one
1037  * less than it should be, so we add one.
1038  * Otherwise, Friday, Saturday or Sunday, the week number is
1039  * OK, but if it is 0, it needs to be 52 or 53.
1040  */
1041  switch (jan1day) {
1042  case 1: /* Monday */
1043  break;
1044  case 2: /* Tuesday */
1045  case 3: /* Wednesday */
1046  case 4: /* Thursday */
1047  weeknum++;
1048  break;
1049  case 5: /* Friday */
1050  case 6: /* Saturday */
1051  case 0: /* Sunday */
1052  if (weeknum == 0) {
1053 #ifdef USE_BROKEN_XPG4
1054  /* XPG4 (as of March 1994) says 53 unconditionally */
1055  weeknum = 53;
1056 #else
1057  /* get week number of last week of last year */
1058  struct tm dec31ly; /* 12/31 last year */
1059  dec31ly = *timeptr;
1060  dec31ly.tm_year--;
1061  dec31ly.tm_mon = 11;
1062  dec31ly.tm_mday = 31;
1063  dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1;
1064  dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900L);
1065  weeknum = iso8601wknum(& dec31ly);
1066 #endif
1067  }
1068  break;
1069  }
1070 
1071  if (timeptr->tm_mon == 11) {
1072  /*
1073  * The last week of the year
1074  * can be in week 1 of next year.
1075  * Sigh.
1076  *
1077  * This can only happen if
1078  * M T W
1079  * 29 30 31
1080  * 30 31
1081  * 31
1082  */
1083  int wday, mday;
1084 
1085  wday = timeptr->tm_wday;
1086  mday = timeptr->tm_mday;
1087  if ( (wday == 1 && (mday >= 29 && mday <= 31))
1088  || (wday == 2 && (mday == 30 || mday == 31))
1089  || (wday == 3 && mday == 31))
1090  weeknum = 1;
1091  }
1092 
1093  return weeknum;
1094 }
1095 
1096 static int
1097 iso8601wknum_v(const struct vtm *vtm)
1098 {
1099  struct tm tm;
1100  vtm2tm_noyear(vtm, &tm);
1101  return iso8601wknum(&tm);
1102 }
1103 
1104 #endif
1105 
1106 /* weeknumber --- figure how many weeks into the year */
1107 
1108 /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */
1109 
1110 static int
1111 weeknumber(const struct tm *timeptr, int firstweekday)
1112 {
1113  int wday = timeptr->tm_wday;
1114  int ret;
1115 
1116  if (firstweekday == 1) {
1117  if (wday == 0) /* sunday */
1118  wday = 6;
1119  else
1120  wday--;
1121  }
1122  ret = ((timeptr->tm_yday + 7 - wday) / 7);
1123  if (ret < 0)
1124  ret = 0;
1125  return ret;
1126 }
1127 
1128 static int
1129 weeknumber_v(const struct vtm *vtm, int firstweekday)
1130 {
1131  struct tm tm;
1132  vtm2tm_noyear(vtm, &tm);
1133  return weeknumber(&tm, firstweekday);
1134 }
1135 
1136 #if 0
1137 /* ADR --- I'm loathe to mess with ado's code ... */
1138 
1139 Date: Wed, 24 Apr 91 20:54:08 MDT
1140 From: Michal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK>
1141 To: arnold@audiofax.com
1142 
1143 Hi Arnold,
1144 in a process of fixing of strftime() in libraries on Atari ST I grabbed
1145 some pieces of code from your own strftime. When doing that it came
1146 to mind that your weeknumber() function compiles a little bit nicer
1147 in the following form:
1148 /*
1149  * firstweekday is 0 if starting in Sunday, non-zero if in Monday
1150  */
1151 {
1152  return (timeptr->tm_yday - timeptr->tm_wday +
1153  (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7;
1154 }
1155 How nicer it depends on a compiler, of course, but always a tiny bit.
1156 
1157  Cheers,
1158  Michal
1159  ntomczak@vm.ucs.ualberta.ca
1160 #endif
1161 
1162 #ifdef TEST_STRFTIME
1163 
1164 /*
1165  * NAME:
1166  * tst
1167  *
1168  * SYNOPSIS:
1169  * tst
1170  *
1171  * DESCRIPTION:
1172  * "tst" is a test driver for the function "strftime".
1173  *
1174  * OPTIONS:
1175  * None.
1176  *
1177  * AUTHOR:
1178  * Karl Vogel
1179  * Control Data Systems, Inc.
1180  * vogelke@c-17igp.wpafb.af.mil
1181  *
1182  * BUGS:
1183  * None noticed yet.
1184  *
1185  * COMPILE:
1186  * cc -o tst -DTEST_STRFTIME strftime.c
1187  */
1188 
1189 /* ADR: I reformatted this to my liking, and deleted some unneeded code. */
1190 
1191 #ifndef NULL
1192 #include <stdio.h>
1193 #endif
1194 #include <sys/time.h>
1195 #include <string.h>
1196 
1197 #define MAXTIME 132
1198 
1199 /*
1200  * Array of time formats.
1201  */
1202 
1203 static char *array[] =
1204 {
1205  "(%%A) full weekday name, var length (Sunday..Saturday) %A",
1206  "(%%B) full month name, var length (January..December) %B",
1207  "(%%C) Century %C",
1208  "(%%D) date (%%m/%%d/%%y) %D",
1209  "(%%E) Locale extensions (ignored) %E",
1210  "(%%H) hour (24-hour clock, 00..23) %H",
1211  "(%%I) hour (12-hour clock, 01..12) %I",
1212  "(%%M) minute (00..59) %M",
1213  "(%%O) Locale extensions (ignored) %O",
1214  "(%%R) time, 24-hour (%%H:%%M) %R",
1215  "(%%S) second (00..60) %S",
1216  "(%%T) time, 24-hour (%%H:%%M:%%S) %T",
1217  "(%%U) week of year, Sunday as first day of week (00..53) %U",
1218  "(%%V) week of year according to ISO 8601 %V",
1219  "(%%W) week of year, Monday as first day of week (00..53) %W",
1220  "(%%X) appropriate locale time representation (%H:%M:%S) %X",
1221  "(%%Y) year with century (1970...) %Y",
1222  "(%%Z) timezone (EDT), or blank if timezone not determinable %Z",
1223  "(%%a) locale's abbreviated weekday name (Sun..Sat) %a",
1224  "(%%b) locale's abbreviated month name (Jan..Dec) %b",
1225  "(%%c) full date (Sat Nov 4 12:02:33 1989)%n%t%t%t %c",
1226  "(%%d) day of the month (01..31) %d",
1227  "(%%e) day of the month, blank-padded ( 1..31) %e",
1228  "(%%h) should be same as (%%b) %h",
1229  "(%%j) day of the year (001..366) %j",
1230  "(%%k) hour, 24-hour clock, blank pad ( 0..23) %k",
1231  "(%%l) hour, 12-hour clock, blank pad ( 1..12) %l",
1232  "(%%m) month (01..12) %m",
1233  "(%%p) locale's AM or PM based on 12-hour clock %p",
1234  "(%%r) time, 12-hour (same as %%I:%%M:%%S %%p) %r",
1235  "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7] %u",
1236  "(%%v) VMS date (dd-bbb-YYYY) %v",
1237  "(%%w) day of week (0..6, Sunday == 0) %w",
1238  "(%%x) appropriate locale date representation %x",
1239  "(%%y) last two digits of year (00..99) %y",
1240  "(%%z) timezone offset east of GMT as HHMM (e.g. -0500) %z",
1241  (char *) NULL
1242 };
1243 
1244 /* main routine. */
1245 
1246 int
1247 main(int argc, char **argv)
1248 {
1249  long time();
1250 
1251  char *next;
1252  char string[MAXTIME];
1253 
1254  int k;
1255  int length;
1256 
1257  struct tm *tm;
1258 
1259  long clock;
1260 
1261  /* Call the function. */
1262 
1263  clock = time((long *) 0);
1264  tm = localtime(&clock);
1265 
1266  for (k = 0; next = array[k]; k++) {
1267  length = strftime(string, MAXTIME, next, tm);
1268  printf("%s\n", string);
1269  }
1270 
1271  exit(0);
1272 }
1273 #endif /* TEST_STRFTIME */
memset
void * memset(void *, int, size_t)
FLAG_FOUND
#define FLAG_FOUND()
BIT_OF
#define BIT_OF(n)
Definition: strftime.c:161
FIX2INT
#define FIX2INT(x)
Definition: ruby.h:717
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#define mod(x, y)
Definition: strftime.c:156
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int tm_min
Definition: rb_mjit_min_header-2.7.2.h:1972
int
__inline__ int
Definition: rb_mjit_min_header-2.7.2.h:2877
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#define INT2FIX(i)
Definition: ruby.h:263
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char * strchr(char *, char)
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#define FILL_PADDING(i)
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#define RSTRING_PTR(str)
Definition: ruby.h:1009
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uint32_t i
Definition: rb_mjit_min_header-2.7.2.h:5499
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#define NUM2LONG(x)
Definition: ruby.h:679
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size_t strftime(char *__restrict _s, size_t _maxsize, const char *__restrict _fmt, const struct tm *__restrict _t)
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rb_encoding * rb_locale_encoding(void)
Definition: encoding.c:1372
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int tm_wday
Definition: rb_mjit_min_header-2.7.2.h:1977
VALUE
unsigned long VALUE
Definition: ruby.h:102
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#define rb_intern(str)
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#define RB_TYPE_P(obj, type)
Definition: ruby.h:560
ECONV_UNDEF_REPLACE
#define ECONV_UNDEF_REPLACE
Definition: encoding.h:396
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#define STRFTIME(fmt)
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Definition: zonetab.h:35
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#define getenv(name)
Definition: win32.c:73
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int tm_sec
Definition: rb_mjit_min_header-2.7.2.h:1971
div
#define div(x, y)
Definition: strftime.c:155
rb_Integer
VALUE rb_Integer(VALUE)
Equivalent to Kernel#Integer in Ruby.
Definition: object.c:3106
NULL
#define NULL
Definition: _sdbm.c:101
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int tm_mon
Definition: rb_mjit_min_header-2.7.2.h:1975
ruby_scan_digits
RUBY_EXTERN unsigned long ruby_scan_digits(const char *str, ssize_t len, int base, size_t *retlen, int *overflow)
Definition: util.c:97
FMT
#define FMT(def_pad, def_prec, fmt, val)
tm::tm_mday
int tm_mday
Definition: rb_mjit_min_header-2.7.2.h:1974
fmt
const VALUE int int int int int int VALUE char * fmt
Definition: rb_mjit_min_header-2.7.2.h:6497
FIX2LONG
#define FIX2LONG(x)
Definition: ruby.h:394
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size_t strlen(const char *)
tm::tm_hour
int tm_hour
Definition: rb_mjit_min_header-2.7.2.h:1973
L
#define L(x)
Definition: asm.h:125
timespec::tv_nsec
long tv_nsec
Definition: missing.h:62
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size_t rb_str_capacity(VALUE str)
Definition: string.c:712
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