1 /* Copyright (C) 1991-1999, 2000 Free Software Foundation, Inc.
3 NOTE: The canonical source of this file is maintained with the GNU C Library.
4 Bugs can be reported to bug-glibc@prep.ai.mit.edu.
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
26 # define HAVE_LIMITS_H 1
28 # define HAVE_MBRLEN 1
29 # define HAVE_STRUCT_ERA_ENTRY 1
30 # define HAVE_TM_GMTOFF 1
31 # define HAVE_TM_ZONE 1
32 # define HAVE_TZNAME 1
34 # define MULTIBYTE_IS_FORMAT_SAFE 1
35 # define STDC_HEADERS 1
36 # include "../locale/localeinfo.h"
39 #if defined emacs && !defined HAVE_BCOPY
40 # define HAVE_MEMCPY 1
44 #include <sys/types.h> /* Some systems define `time_t' here. */
46 #ifdef TIME_WITH_SYS_TIME
47 # include <sys/time.h>
50 # ifdef HAVE_SYS_TIME_H
51 # include <sys/time.h>
57 extern char *tzname[];
60 /* Do multibyte processing if multibytes are supported, unless
61 multibyte sequences are safe in formats. Multibyte sequences are
62 safe if they cannot contain byte sequences that look like format
63 conversion specifications. The GNU C Library uses UTF8 multibyte
64 encoding, which is safe for formats, but strftime.c can be used
65 with other C libraries that use unsafe encodings. */
66 #define DO_MULTIBYTE (HAVE_MBLEN && ! MULTIBYTE_IS_FORMAT_SAFE)
72 /* Simulate mbrlen with mblen as best we can. */
73 # define mbstate_t int
74 # define mbrlen(s, n, ps) mblen (s, n)
75 # define mbsinit(ps) (*(ps) == 0)
77 static const mbstate_t mbstate_zero;
90 # define memcpy(d, s, n) bcopy ((s), (d), (n))
96 # define CHAR_T wchar_t
97 # define UCHAR_T unsigned int
98 # define L_(Str) L##Str
99 # define NLW(Sym) _NL_W##Sym
101 # define MEMCPY(d, s, n) __wmemcpy (d, s, n)
102 # define STRLEN(s) __wcslen (s)
106 # define UCHAR_T unsigned char
108 # define NLW(Sym) Sym
110 # if !defined STDC_HEADERS && !defined HAVE_MEMCPY
111 # define MEMCPY(d, s, n) bcopy ((s), (d), (n))
113 # define MEMCPY(d, s, n) memcpy ((d), (s), (n))
115 # define STRLEN(s) strlen (s)
118 # define MEMPCPY(d, s, n) __mempcpy (d, s, n)
120 # ifndef HAVE_MEMPCPY
121 # define MEMPCPY(d, s, n) ((void *) ((char *) memcpy (d, s, n) + (n)))
127 # if defined __GNUC__ || (defined __STDC__ && __STDC__)
128 # define __P(args) args
130 # define __P(args) ()
132 #endif /* Not __P. */
150 #define TYPE_SIGNED(t) ((t) -1 < 0)
152 /* Bound on length of the string representing an integer value of type t.
153 Subtract one for the sign bit if t is signed;
154 302 / 1000 is log10 (2) rounded up;
155 add one for integer division truncation;
156 add one more for a minus sign if t is signed. */
157 #define INT_STRLEN_BOUND(t) \
158 ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 + 1 + TYPE_SIGNED (t))
160 #define TM_YEAR_BASE 1900
163 /* Nonzero if YEAR is a leap year (every 4 years,
164 except every 100th isn't, and every 400th is). */
165 # define __isleap(year) \
166 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
171 # define my_strftime_gmtime_r __gmtime_r
172 # define my_strftime_localtime_r __localtime_r
173 # define tzname __tzname
174 # define tzset __tzset
177 /* If we're a strftime substitute in a GNU program, then prefer gmtime
178 to gmtime_r, since many gmtime_r implementations are buggy.
179 Similarly for localtime_r. */
181 # if ! HAVE_TM_GMTOFF
182 static struct tm *my_strftime_gmtime_r __P ((const time_t *, struct tm *));
184 my_strftime_gmtime_r (t, tp)
188 struct tm *l = gmtime (t);
194 # endif /* ! HAVE_TM_GMTOFF */
196 static struct tm *my_strftime_localtime_r __P ((const time_t *, struct tm *));
198 my_strftime_localtime_r (t, tp)
202 struct tm *l = localtime (t);
208 #endif /* ! defined _LIBC */
211 #if !defined memset && !defined HAVE_MEMSET && !defined _LIBC
212 /* Some systems lack the `memset' function and we don't want to
213 introduce additional dependencies. */
214 /* The SGI compiler reportedly barfs on the trailing null
215 if we use a string constant as the initializer. 28 June 1997, rms. */
216 static const CHAR_T spaces[16] = /* " " */
218 L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),
219 L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' ')
221 static const CHAR_T zeroes[16] = /* "0000000000000000" */
223 L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),
224 L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0')
227 # define memset_space(P, Len) \
233 int _this = _len > 16 ? 16 : _len; \
234 (P) = MEMPCPY ((P), spaces, _this * sizeof (CHAR_T)); \
240 # define memset_zero(P, Len) \
246 int _this = _len > 16 ? 16 : _len; \
247 (P) = MEMPCPY ((P), zeroes, _this * sizeof (CHAR_T)); \
254 # define memset_space(P, Len) (wmemset ((P), L' ', (Len)), (P) += (Len))
255 # define memset_zero(P, Len) (wmemset ((P), L'0', (Len)), (P) += (Len))
257 # define memset_space(P, Len) (memset ((P), ' ', (Len)), (P) += (Len))
258 # define memset_zero(P, Len) (memset ((P), '0', (Len)), (P) += (Len))
266 int _delta = width - _n; \
267 int _incr = _n + (_delta > 0 ? _delta : 0); \
268 if (i + _incr >= maxsize) \
274 if (pad == L_('0')) \
275 memset_zero (p, _delta); \
277 memset_space (p, _delta); \
288 memcpy_lowcase (p, (s), _n); \
289 else if (to_uppcase) \
290 memcpy_uppcase (p, (s), _n); \
292 MEMCPY ((PTR) p, (PTR) (s), _n))
295 # define widen(os, ws, l) \
298 const char *__s = os; \
299 memset (&__st, '\0', sizeof (__st)); \
300 l = __mbsrtowcs (NULL, &__s, 0, &__st); \
301 ws = alloca ((l + 1) * sizeof (wchar_t)); \
302 (void) __mbsrtowcs (ws, &__s, l, &__st); \
308 # define TOUPPER(Ch) towupper (Ch)
309 # define TOLOWER(Ch) towlower (Ch)
312 # define TOUPPER(Ch) toupper (Ch)
313 # define TOLOWER(Ch) tolower (Ch)
315 # define TOUPPER(Ch) (islower (Ch) ? toupper (Ch) : (Ch))
316 # define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
319 /* We don't use `isdigit' here since the locale dependent
320 interpretation is not what we want here. We only need to accept
321 the arabic digits in the ASCII range. One day there is perhaps a
322 more reliable way to accept other sets of digits. */
323 #define ISDIGIT(Ch) ((unsigned int) (Ch) - L_('0') <= 9)
325 static CHAR_T *memcpy_lowcase __P ((CHAR_T *dest, const CHAR_T *src,
329 memcpy_lowcase (dest, src, len)
335 dest[len] = TOLOWER ((UCHAR_T) src[len]);
339 static CHAR_T *memcpy_uppcase __P ((CHAR_T *dest, const CHAR_T *src,
343 memcpy_uppcase (dest, src, len)
349 dest[len] = TOUPPER ((UCHAR_T) src[len]);
355 /* Yield the difference between *A and *B,
356 measured in seconds, ignoring leap seconds. */
357 # define tm_diff ftime_tm_diff
358 static int tm_diff __P ((const struct tm *, const struct tm *));
364 /* Compute intervening leap days correctly even if year is negative.
365 Take care to avoid int overflow in leap day calculations,
366 but it's OK to assume that A and B are close to each other. */
367 int a4 = (a->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (a->tm_year & 3);
368 int b4 = (b->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (b->tm_year & 3);
369 int a100 = a4 / 25 - (a4 % 25 < 0);
370 int b100 = b4 / 25 - (b4 % 25 < 0);
371 int a400 = a100 >> 2;
372 int b400 = b100 >> 2;
373 int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
374 int years = a->tm_year - b->tm_year;
375 int days = (365 * years + intervening_leap_days
376 + (a->tm_yday - b->tm_yday));
377 return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
378 + (a->tm_min - b->tm_min))
379 + (a->tm_sec - b->tm_sec));
381 #endif /* ! HAVE_TM_GMTOFF */
385 /* The number of days from the first day of the first ISO week of this
386 year to the year day YDAY with week day WDAY. ISO weeks start on
387 Monday; the first ISO week has the year's first Thursday. YDAY may
388 be as small as YDAY_MINIMUM. */
389 #define ISO_WEEK_START_WDAY 1 /* Monday */
390 #define ISO_WEEK1_WDAY 4 /* Thursday */
391 #define YDAY_MINIMUM (-366)
392 static int iso_week_days __P ((int, int));
397 iso_week_days (yday, wday)
401 /* Add enough to the first operand of % to make it nonnegative. */
402 int big_enough_multiple_of_7 = (-YDAY_MINIMUM / 7 + 2) * 7;
404 - (yday - wday + ISO_WEEK1_WDAY + big_enough_multiple_of_7) % 7
405 + ISO_WEEK1_WDAY - ISO_WEEK_START_WDAY);
409 #if !(defined _NL_CURRENT || HAVE_STRFTIME)
410 static CHAR_T const weekday_name[][10] =
412 L_("Sunday"), L_("Monday"), L_("Tuesday"), L_("Wednesday"),
413 L_("Thursday"), L_("Friday"), L_("Saturday")
415 static CHAR_T const month_name[][10] =
417 L_("January"), L_("February"), L_("March"), L_("April"), L_("May"),
418 L_("June"), L_("July"), L_("August"), L_("September"), L_("October"),
419 L_("November"), L_("December")
425 # define my_strftime emacs_strftimeu
426 # define ut_argument , ut
427 # define ut_argument_spec int ut;
428 # define ut_argument_spec_iso , int ut
431 # define my_strftime wcsftime
433 # define my_strftime strftime
436 # define ut_argument_spec
437 # define ut_argument_spec_iso
438 /* We don't have this information in general. */
442 #if !defined _LIBC && HAVE_TZNAME && HAVE_TZSET
443 /* Solaris 2.5 tzset sometimes modifies the storage returned by localtime.
444 Work around this bug by copying *tp before it might be munged. */
445 size_t _strftime_copytm __P ((char *, size_t, const char *,
446 const struct tm * ut_argument_spec_iso));
448 my_strftime (s, maxsize, format, tp ut_argument)
451 const CHAR_T *format;
457 return _strftime_copytm (s, maxsize, format, &tmcopy ut_argument);
460 # define my_strftime _strftime_copytm
464 /* Write information from TP into S according to the format
465 string FORMAT, writing no more that MAXSIZE characters
466 (including the terminating '\0') and returning number of
467 characters written. If S is NULL, nothing will be written
468 anywhere, so to determine how many characters would be
469 written, use NULL for S and (size_t) UINT_MAX for MAXSIZE. */
471 my_strftime (s, maxsize, format, tp ut_argument)
474 const CHAR_T *format;
478 int hour12 = tp->tm_hour;
480 /* We cannot make the following values variables since we must delay
481 the evaluation of these values until really needed since some
482 expressions might not be valid in every situation. The `struct tm'
483 might be generated by a strptime() call that initialized
484 only a few elements. Dereference the pointers only if the format
485 requires this. Then it is ok to fail if the pointers are invalid. */
487 ((const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(ABDAY_1) + tp->tm_wday))
489 ((const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(DAY_1) + tp->tm_wday))
491 ((const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(ABMON_1) + tp->tm_mon))
493 ((const CHAR_T *) _NL_CURRENT (LC_TIME, NLW(MON_1) + tp->tm_mon))
495 ((const CHAR_T *) _NL_CURRENT (LC_TIME, tp->tm_hour > 11 \
496 ? NLW(PM_STR) : NLW(AM_STR)))
498 # define aw_len STRLEN (a_wkday)
499 # define am_len STRLEN (a_month)
500 # define ap_len STRLEN (ampm)
503 # define f_wkday (weekday_name[tp->tm_wday])
504 # define f_month (month_name[tp->tm_mon])
505 # define a_wkday f_wkday
506 # define a_month f_month
507 # define ampm (L_("AMPM") + 2 * (tp->tm_hour > 11))
518 #if DO_MULTIBYTE && !defined COMPILE_WIDE
519 const char *format_end = NULL;
524 /* The POSIX test suite assumes that setting
525 the environment variable TZ to a new value before calling strftime()
526 will influence the result (the %Z format) even if the information in
527 TP is computed with a totally different time zone.
528 This is bogus: though POSIX allows bad behavior like this,
529 POSIX does not require it. Do the right thing instead. */
530 zone = (const char *) tp->tm_zone;
535 if (! (zone && *zone))
540 /* POSIX.1 8.1.1 requires that whenever strftime() is called, the
541 time zone names contained in the external variable `tzname' shall
542 be set as if the tzset() function had been called. */
555 for (f = format; *f != '\0'; ++f)
557 int pad = 0; /* Padding for number ('-', '_', or 0). */
558 int modifier; /* Field modifier ('E', 'O', or 0). */
559 int digits; /* Max digits for numeric format. */
560 int number_value; /* Numeric value to be printed. */
561 int negative_number; /* 1 if the number is negative. */
562 const CHAR_T *subfmt;
564 CHAR_T buf[1 + (sizeof (int) < sizeof (time_t)
565 ? INT_STRLEN_BOUND (time_t)
566 : INT_STRLEN_BOUND (int))];
573 #if DO_MULTIBYTE && !defined COMPILE_WIDE
579 case L_('\b'): case L_('\t'): case L_('\n'):
580 case L_('\v'): case L_('\f'): case L_('\r'):
581 case L_(' '): case L_('!'): case L_('"'): case L_('#'): case L_('&'):
582 case L_('\''): case L_('('): case L_(')'): case L_('*'): case L_('+'):
583 case L_(','): case L_('-'): case L_('.'): case L_('/'): case L_('0'):
584 case L_('1'): case L_('2'): case L_('3'): case L_('4'): case L_('5'):
585 case L_('6'): case L_('7'): case L_('8'): case L_('9'): case L_(':'):
586 case L_(';'): case L_('<'): case L_('='): case L_('>'): case L_('?'):
587 case L_('A'): case L_('B'): case L_('C'): case L_('D'): case L_('E'):
588 case L_('F'): case L_('G'): case L_('H'): case L_('I'): case L_('J'):
589 case L_('K'): case L_('L'): case L_('M'): case L_('N'): case L_('O'):
590 case L_('P'): case L_('Q'): case L_('R'): case L_('S'): case L_('T'):
591 case L_('U'): case L_('V'): case L_('W'): case L_('X'): case L_('Y'):
592 case L_('Z'): case L_('['): case L_('\\'): case L_(']'): case L_('^'):
593 case L_('_'): case L_('a'): case L_('b'): case L_('c'): case L_('d'):
594 case L_('e'): case L_('f'): case L_('g'): case L_('h'): case L_('i'):
595 case L_('j'): case L_('k'): case L_('l'): case L_('m'): case L_('n'):
596 case L_('o'): case L_('p'): case L_('q'): case L_('r'): case L_('s'):
597 case L_('t'): case L_('u'): case L_('v'): case L_('w'): case L_('x'):
598 case L_('y'): case L_('z'): case L_('{'): case L_('|'): case L_('}'):
600 /* The C Standard requires these 98 characters (plus '%') to
601 be in the basic execution character set. None of these
602 characters can start a multibyte sequence, so they need
603 not be analyzed further. */
608 /* Copy this multibyte sequence until we reach its end, find
609 an error, or come back to the initial shift state. */
611 mbstate_t mbstate = mbstate_zero;
616 format_end = f + strlen (f) + 1;
617 fsize = format_end - f;
621 size_t bytes = mbrlen (f + len, fsize - len, &mbstate);
626 if (bytes == (size_t) -2)
628 len += strlen (f + len);
632 if (bytes == (size_t) -1)
640 while (! mbsinit (&mbstate));
648 #else /* ! DO_MULTIBYTE */
650 /* Either multibyte encodings are not supported, they are
651 safe for formats, so any non-'%' byte can be copied through,
652 or this is the wide character version. */
659 #endif /* ! DO_MULTIBYTE */
661 /* Check for flags that can modify a format. */
666 /* This influences the number formats. */
673 /* This changes textual output. */
687 /* As a GNU extension we allow to specify the field width. */
694 width += *f - L_('0');
697 while (ISDIGIT (*f));
700 /* Check for modifiers. */
713 /* Now do the specified format. */
717 #define DO_NUMBER(d, v) \
718 digits = width == -1 ? d : width; \
719 number_value = v; goto do_number
720 #define DO_NUMBER_SPACEPAD(d, v) \
721 digits = width == -1 ? d : width; \
722 number_value = v; goto do_number_spacepad
738 #if defined _NL_CURRENT || !HAVE_STRFTIME
739 cpy (aw_len, a_wkday);
742 goto underlying_strftime;
753 #if defined _NL_CURRENT || !HAVE_STRFTIME
754 cpy (STRLEN (f_wkday), f_wkday);
757 goto underlying_strftime;
761 case L_('h'): /* POSIX.2 extension. */
769 #if defined _NL_CURRENT || !HAVE_STRFTIME
770 cpy (am_len, a_month);
773 goto underlying_strftime;
784 #if defined _NL_CURRENT || !HAVE_STRFTIME
785 cpy (STRLEN (f_month), f_month);
788 goto underlying_strftime;
792 if (modifier == L_('O'))
795 if (! (modifier == 'E'
796 && (*(subfmt = (CHAR_T *) _NL_CURRENT (LC_TIME,
799 subfmt = (CHAR_T *) _NL_CURRENT (LC_TIME, NLW(D_T_FMT));
802 goto underlying_strftime;
804 subfmt = L_("%a %b %e %H:%M:%S %Y");
810 CHAR_T *old_start = p;
811 size_t len = my_strftime (NULL, (size_t) -1, subfmt,
813 add (len, my_strftime (p, maxsize - i, subfmt,
817 while (old_start < p)
819 *old_start = TOUPPER ((UCHAR_T) *old_start);
825 #if HAVE_STRFTIME && ! (defined _NL_CURRENT && HAVE_STRUCT_ERA_ENTRY)
828 /* The relevant information is available only via the
829 underlying strftime implementation, so use that. */
832 char ubuf[1024]; /* enough for any single format in practice */
834 /* Make sure we're calling the actual underlying strftime.
835 In some cases, config.h contains something like
836 "#define strftime rpl_strftime". */
847 len = strftime (ubuf, sizeof ubuf, ufmt, tp);
848 if (len == 0 && ubuf[0] != '\0')
855 case L_('C'): /* POSIX.2 extension. */
856 if (modifier == L_('O'))
858 if (modifier == L_('E'))
860 #if HAVE_STRUCT_ERA_ENTRY
861 struct era_entry *era = _nl_get_era_entry (tp);
865 size_t len = __wcslen (era->era_wname);
866 cpy (len, era->era_wname);
868 size_t len = strlen (era->era_name);
869 cpy (len, era->era_name);
875 goto underlying_strftime;
881 int year = tp->tm_year + TM_YEAR_BASE;
882 DO_NUMBER (1, year / 100 - (year % 100 < 0));
886 if (modifier == L_('O'))
889 if (! (modifier == L_('E')
890 && (*(subfmt = (CHAR_T *)_NL_CURRENT (LC_TIME,
893 subfmt = (CHAR_T *) _NL_CURRENT (LC_TIME, NLW(D_FMT));
897 goto underlying_strftime;
902 case L_('D'): /* POSIX.2 extension. */
905 subfmt = L_("%m/%d/%y");
909 if (modifier == L_('E'))
912 DO_NUMBER (2, tp->tm_mday);
914 case L_('e'): /* POSIX.2 extension. */
915 if (modifier == L_('E'))
918 DO_NUMBER_SPACEPAD (2, tp->tm_mday);
920 /* All numeric formats set DIGITS and NUMBER_VALUE and then
921 jump to one of these two labels. */
924 /* Force `_' flag unless overwritten by `0' flag. */
929 /* Format the number according to the MODIFIER flag. */
931 if (modifier == L_('O') && 0 <= number_value)
934 /* Get the locale specific alternate representation of
935 the number NUMBER_VALUE. If none exist NULL is returned. */
937 const wchar_t *cp = _nl_get_walt_digit (number_value);
939 const char *cp = _nl_get_alt_digit (number_value);
944 size_t digitlen = STRLEN (cp);
953 goto underlying_strftime;
958 unsigned int u = number_value;
960 bufp = buf + sizeof (buf) / sizeof (buf[0]);
961 negative_number = number_value < 0;
967 *--bufp = u % 10 + L_('0');
968 while ((u /= 10) != 0);
971 do_number_sign_and_padding:
977 int padding = digits - (buf + (sizeof (buf) / sizeof (buf[0]))
982 while (0 < padding--)
987 bufp += negative_number;
988 while (0 < padding--)
995 cpy (buf + sizeof (buf) / sizeof (buf[0]) - bufp, bufp);
1001 subfmt = L_("%Y-%m-%d");
1005 if (modifier == L_('E'))
1008 DO_NUMBER (2, tp->tm_hour);
1011 if (modifier == L_('E'))
1014 DO_NUMBER (2, hour12);
1016 case L_('k'): /* GNU extension. */
1017 if (modifier == L_('E'))
1020 DO_NUMBER_SPACEPAD (2, tp->tm_hour);
1022 case L_('l'): /* GNU extension. */
1023 if (modifier == L_('E'))
1026 DO_NUMBER_SPACEPAD (2, hour12);
1029 if (modifier == L_('E'))
1032 DO_NUMBER (3, 1 + tp->tm_yday);
1035 if (modifier == L_('E'))
1038 DO_NUMBER (2, tp->tm_min);
1041 if (modifier == L_('E'))
1044 DO_NUMBER (2, tp->tm_mon + 1);
1046 case L_('n'): /* POSIX.2 extension. */
1047 add (1, *p = L_('\n'));
1052 #if !defined _NL_CURRENT && HAVE_STRFTIME
1053 format_char = L_('p');
1063 #if defined _NL_CURRENT || !HAVE_STRFTIME
1067 goto underlying_strftime;
1070 case L_('R'): /* GNU extension. */
1071 subfmt = L_("%H:%M");
1074 case L_('r'): /* POSIX.2 extension. */
1076 if (*(subfmt = (CHAR_T *) _NL_CURRENT (LC_TIME,
1077 NLW(T_FMT_AMPM))) == L_('\0'))
1079 subfmt = L_("%I:%M:%S %p");
1083 if (modifier == L_('E'))
1086 DO_NUMBER (2, tp->tm_sec);
1088 case L_('s'): /* GNU extension. */
1096 /* Generate string value for T using time_t arithmetic;
1097 this works even if sizeof (long) < sizeof (time_t). */
1099 bufp = buf + sizeof (buf) / sizeof (buf[0]);
1100 negative_number = t < 0;
1107 if (negative_number)
1111 /* Adjust if division truncates to minus infinity. */
1112 if (0 < -1 % 10 && d < 0)
1119 *--bufp = d + L_('0');
1124 goto do_number_sign_and_padding;
1128 if (modifier == L_('O'))
1131 if (! (modifier == L_('E')
1132 && (*(subfmt = (CHAR_T *) _NL_CURRENT (LC_TIME,
1135 subfmt = (CHAR_T *) _NL_CURRENT (LC_TIME, NLW(T_FMT));
1139 goto underlying_strftime;
1144 case L_('T'): /* POSIX.2 extension. */
1145 subfmt = L_("%H:%M:%S");
1148 case L_('t'): /* POSIX.2 extension. */
1149 add (1, *p = L_('\t'));
1152 case L_('u'): /* POSIX.2 extension. */
1153 DO_NUMBER (1, (tp->tm_wday - 1 + 7) % 7 + 1);
1156 if (modifier == L_('E'))
1159 DO_NUMBER (2, (tp->tm_yday - tp->tm_wday + 7) / 7);
1162 case L_('g'): /* GNU extension. */
1163 case L_('G'): /* GNU extension. */
1164 if (modifier == L_('E'))
1167 int year = tp->tm_year + TM_YEAR_BASE;
1168 int days = iso_week_days (tp->tm_yday, tp->tm_wday);
1172 /* This ISO week belongs to the previous year. */
1174 days = iso_week_days (tp->tm_yday + (365 + __isleap (year)),
1179 int d = iso_week_days (tp->tm_yday - (365 + __isleap (year)),
1183 /* This ISO week belongs to the next year. */
1192 DO_NUMBER (2, (year % 100 + 100) % 100);
1195 DO_NUMBER (1, year);
1198 DO_NUMBER (2, days / 7 + 1);
1203 if (modifier == L_('E'))
1206 DO_NUMBER (2, (tp->tm_yday - (tp->tm_wday - 1 + 7) % 7 + 7) / 7);
1209 if (modifier == L_('E'))
1212 DO_NUMBER (1, tp->tm_wday);
1215 if (modifier == 'E')
1217 #if HAVE_STRUCT_ERA_ENTRY
1218 struct era_entry *era = _nl_get_era_entry (tp);
1221 # ifdef COMPILE_WIDE
1222 subfmt = era->era_wformat;
1224 subfmt = era->era_format;
1230 goto underlying_strftime;
1234 if (modifier == L_('O'))
1237 DO_NUMBER (1, tp->tm_year + TM_YEAR_BASE);
1240 if (modifier == L_('E'))
1242 #if HAVE_STRUCT_ERA_ENTRY
1243 struct era_entry *era = _nl_get_era_entry (tp);
1246 int delta = tp->tm_year - era->start_date[0];
1247 DO_NUMBER (1, (era->offset
1248 + delta * era->absolute_direction));
1252 goto underlying_strftime;
1256 DO_NUMBER (2, (tp->tm_year % 100 + 100) % 100);
1266 /* The tzset() call might have changed the value. */
1267 if (!(zone && *zone) && tp->tm_isdst >= 0)
1268 zone = tzname[tp->tm_isdst];
1271 zone = ""; /* POSIX.2 requires the empty string here. */
1275 /* The zone string is always given in multibyte form. We have
1276 to transform it first. */
1279 widen (zone, wczone, len);
1283 cpy (strlen (zone), zone);
1287 case L_('z'): /* GNU extension. */
1288 if (tp->tm_isdst < 0)
1294 diff = tp->tm_gmtoff;
1307 if (lt == (time_t) -1)
1309 /* mktime returns -1 for errors, but -1 is also a
1310 valid time_t value. Check whether an error really
1314 if (! my_strftime_localtime_r (<, &tm)
1315 || ((ltm.tm_sec ^ tm.tm_sec)
1316 | (ltm.tm_min ^ tm.tm_min)
1317 | (ltm.tm_hour ^ tm.tm_hour)
1318 | (ltm.tm_mday ^ tm.tm_mday)
1319 | (ltm.tm_mon ^ tm.tm_mon)
1320 | (ltm.tm_year ^ tm.tm_year)))
1324 if (! my_strftime_gmtime_r (<, >m))
1327 diff = tm_diff (<m, >m);
1333 add (1, *p = L_('-'));
1337 add (1, *p = L_('+'));
1340 DO_NUMBER (4, (diff / 60) * 100 + diff % 60);
1343 case L_('\0'): /* GNU extension: % at end of format. */
1347 /* Unknown format; output the format, including the '%',
1348 since this is most likely the right thing to do if a
1349 multibyte string has been misparsed. */
1353 for (flen = 1; f[1 - flen] != L_('%'); flen++)
1355 cpy (flen, &f[1 - flen]);
1361 if (p && maxsize != 0)
1368 /* For Emacs we have a separate interface which corresponds to the normal
1369 strftime function and does not have the extra information whether the
1370 TP arguments comes from a `gmtime' call or not. */
1372 emacs_strftime (s, maxsize, format, tp)
1376 const struct tm *tp;
1378 return my_strftime (s, maxsize, format, tp, 0);