1 /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
3 NOTE: The canonical source of this file is maintained with the GNU C
4 Library. 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
14 GNU 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 Foundation,
18 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
25 # define HAVE_LIMITS_H 1
27 # define HAVE_MBRLEN 1
28 # define HAVE_STRUCT_ERA_ENTRY 1
29 # define HAVE_TM_GMTOFF 1
30 # define HAVE_TM_ZONE 1
31 # define HAVE_TZNAME 1
33 # define MULTIBYTE_IS_FORMAT_SAFE 1
34 # define STDC_HEADERS 1
35 # include <ansidecl.h>
36 # include "../locale/localeinfo.h"
40 #include <sys/types.h> /* Some systems define `time_t' here. */
42 #ifdef TIME_WITH_SYS_TIME
43 # include <sys/time.h>
46 # ifdef HAVE_SYS_TIME_H
47 # include <sys/time.h>
53 extern char *tzname[];
56 /* Do multibyte processing if multibytes are supported, unless
57 multibyte sequences are safe in formats. Multibyte sequences are
58 safe if they cannot contain byte sequences that look like format
59 conversion specifications. The GNU C Library uses UTF8 multibyte
60 encoding, which is safe for formats, but strftime.c can be used
61 with other C libraries that use unsafe encodings. */
62 #define DO_MULTIBYTE (HAVE_MBLEN && ! MULTIBYTE_IS_FORMAT_SAFE)
68 /* Simulate mbrlen with mblen as best we can. */
69 # define mbstate_t int
70 # define mbrlen(s, n, ps) mblen (s, n)
71 # define mbsinit(ps) (*(ps) == 0)
73 static const mbstate_t mbstate_zero;
85 # define memcpy(d, s, n) bcopy ((s), (d), (n))
89 # if defined (__GNUC__) || (defined (__STDC__) && __STDC__)
90 # define __P(args) args
112 #define TYPE_SIGNED(t) ((t) -1 < 0)
114 /* Bound on length of the string representing an integer value of type t.
115 Subtract one for the sign bit if t is signed;
116 302 / 1000 is log10 (2) rounded up;
117 add one for integer division truncation;
118 add one more for a minus sign if t is signed. */
119 #define INT_STRLEN_BOUND(t) \
120 ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 100 + 1 + TYPE_SIGNED (t))
122 #define TM_YEAR_BASE 1900
125 /* Nonzero if YEAR is a leap year (every 4 years,
126 except every 100th isn't, and every 400th is). */
127 # define __isleap(year) \
128 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
133 # define gmtime_r __gmtime_r
134 # define localtime_r __localtime_r
135 extern int __tz_compute __P ((time_t timer, const struct tm *tm));
136 # define tzname __tzname
137 # define tzset __tzset
139 # if ! HAVE_LOCALTIME_R
140 # if ! HAVE_TM_GMTOFF
141 /* Approximate gmtime_r as best we can in its absence. */
142 # define gmtime_r my_gmtime_r
143 static struct tm *gmtime_r __P ((const time_t *, struct tm *));
149 struct tm *l = gmtime (t);
155 # endif /* ! HAVE_TM_GMTOFF */
157 /* Approximate localtime_r as best we can in its absence. */
158 # define localtime_r my_localtime_r
159 static struct tm *localtime_r __P ((const time_t *, struct tm *));
165 struct tm *l = localtime (t);
171 # endif /* ! HAVE_LOCALTIME_R */
172 #endif /* ! defined (_LIBC) */
175 #if !defined (memset) && !defined (HAVE_MEMSET) && !defined (_LIBC)
176 /* Some systems lack the `memset' function and we don't want to
177 introduce additional dependencies. */
178 static const char spaces[16] = " ";
180 # define memset_space(P, Len) \
186 int _this = _len > 16 ? 16 : _len; \
187 memcpy ((P), spaces, _this); \
194 # define memset_space(P, Len) memset ((P), ' ', (Len))
201 int _delta = width - _n; \
202 int _incr = _n + (_delta > 0 ? _delta : 0); \
203 if (i + _incr >= maxsize) \
208 memset_space (p, _delta); \
218 memcpy_lowcase (p, (s), _n); \
219 else if (to_uppcase) \
220 memcpy_uppcase (p, (s), _n); \
222 memcpy ((PTR) p, (PTR) (s), _n))
227 # define TOUPPER(Ch) toupper (Ch)
228 # define TOLOWER(Ch) tolower (Ch)
230 # define TOUPPER(Ch) (islower (Ch) ? toupper (Ch) : (Ch))
231 # define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
233 /* We don't use `isdigit' here since the locale dependent
234 interpretation is not what we want here. We only need to accept
235 the arabic digits in the ASCII range. One day there is perhaps a
236 more reliable way to accept other sets of digits. */
237 #define ISDIGIT(Ch) ((unsigned int) (Ch) - '0' <= 9)
239 static char *memcpy_lowcase __P ((char *dest, const char *src, size_t len));
242 memcpy_lowcase (dest, src, len)
248 dest[len] = TOLOWER (src[len]);
252 static char *memcpy_uppcase __P ((char *dest, const char *src, size_t len));
255 memcpy_uppcase (dest, src, len)
261 dest[len] = TOUPPER (src[len]);
266 /* Yield the difference between *A and *B,
267 measured in seconds, ignoring leap seconds. */
268 static int tm_diff __P ((const struct tm *, const struct tm *));
274 /* Compute intervening leap days correctly even if year is negative.
275 Take care to avoid int overflow in leap day calculations,
276 but it's OK to assume that A and B are close to each other. */
277 int a4 = (a->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (a->tm_year & 3);
278 int b4 = (b->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (b->tm_year & 3);
279 int a100 = a4 / 25 - (a4 % 25 < 0);
280 int b100 = b4 / 25 - (b4 % 25 < 0);
281 int a400 = a100 >> 2;
282 int b400 = b100 >> 2;
283 int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
284 int years = a->tm_year - b->tm_year;
285 int days = (365 * years + intervening_leap_days
286 + (a->tm_yday - b->tm_yday));
287 return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
288 + (a->tm_min - b->tm_min))
289 + (a->tm_sec - b->tm_sec));
291 #endif /* ! HAVE_TM_GMTOFF */
295 /* The number of days from the first day of the first ISO week of this
296 year to the year day YDAY with week day WDAY. ISO weeks start on
297 Monday; the first ISO week has the year's first Thursday. YDAY may
298 be as small as YDAY_MINIMUM. */
299 #define ISO_WEEK_START_WDAY 1 /* Monday */
300 #define ISO_WEEK1_WDAY 4 /* Thursday */
301 #define YDAY_MINIMUM (-366)
302 static int iso_week_days __P ((int, int));
307 iso_week_days (yday, wday)
311 /* Add enough to the first operand of % to make it nonnegative. */
312 int big_enough_multiple_of_7 = (-YDAY_MINIMUM / 7 + 2) * 7;
314 - (yday - wday + ISO_WEEK1_WDAY + big_enough_multiple_of_7) % 7
315 + ISO_WEEK1_WDAY - ISO_WEEK_START_WDAY);
320 static char const weekday_name[][10] =
322 "Sunday", "Monday", "Tuesday", "Wednesday",
323 "Thursday", "Friday", "Saturday"
325 static char const month_name[][10] =
327 "January", "February", "March", "April", "May", "June",
328 "July", "August", "September", "October", "November", "December"
332 /* Write information from TP into S according to the format
333 string FORMAT, writing no more that MAXSIZE characters
334 (including the terminating '\0') and returning number of
335 characters written. If S is NULL, nothing will be written
336 anywhere, so to determine how many characters would be
337 written, use NULL for S and (size_t) UINT_MAX for MAXSIZE. */
339 strftime (s, maxsize, format, tp)
345 int hour12 = tp->tm_hour;
347 const char *const a_wkday = _NL_CURRENT (LC_TIME, ABDAY_1 + tp->tm_wday);
348 const char *const f_wkday = _NL_CURRENT (LC_TIME, DAY_1 + tp->tm_wday);
349 const char *const a_month = _NL_CURRENT (LC_TIME, ABMON_1 + tp->tm_mon);
350 const char *const f_month = _NL_CURRENT (LC_TIME, MON_1 + tp->tm_mon);
351 const char *const ampm = _NL_CURRENT (LC_TIME,
352 hour12 > 11 ? PM_STR : AM_STR);
353 size_t aw_len = strlen (a_wkday);
354 size_t am_len = strlen (a_month);
355 size_t ap_len = strlen (ampm);
357 const char *const f_wkday = weekday_name[tp->tm_wday];
358 const char *const f_month = month_name[tp->tm_mon];
359 const char *const a_wkday = f_wkday;
360 const char *const a_month = f_month;
361 const char *const ampm = "AMPM" + 2 * (hour12 > 11);
366 size_t wkday_len = strlen (f_wkday);
367 size_t month_len = strlen (f_month);
375 #if !defined _LIBC && HAVE_TM_ZONE
376 /* XXX We have some problems here. First, the string pointed to by
377 tm_zone is dynamically allocated while loading the zone data. But
378 when another zone is loaded since the information in TP were
379 computed this would be a stale pointer.
380 The second problem is the POSIX test suite which assumes setting
381 the environment variable TZ to a new value before calling strftime()
382 will influence the result (the %Z format) even if the information in
383 TP is computed with a totally different time zone. --drepper@gnu */
384 zone = (const char *) tp->tm_zone;
387 /* POSIX.1 8.1.1 requires that whenever strftime() is called, the
388 time zone names contained in the external variable `tzname' shall
389 be set as if the tzset() function had been called. */
394 if (!(zone && *zone) && tp->tm_isdst >= 0)
395 zone = tzname[tp->tm_isdst];
398 zone = ""; /* POSIX.2 requires the empty string here. */
400 zonelen = strlen (zone);
405 if (hour12 == 0) hour12 = 12;
407 for (f = format; *f != '\0'; ++f)
409 int pad; /* Padding for number ('-', '_', or 0). */
410 int modifier; /* Field modifier ('E', 'O', or 0). */
411 int digits; /* Max digits for numeric format. */
412 int number_value; /* Numeric value to be printed. */
413 int negative_number; /* 1 if the number is negative. */
416 char buf[1 + (sizeof (int) < sizeof (time_t)
417 ? INT_STRLEN_BOUND (time_t)
418 : INT_STRLEN_BOUND (int))];
430 case '\a': case '\b': case '\t': case '\n':
431 case '\v': case '\f': case '\r':
432 case ' ': case '!': case '"': case '#': case '&': case'\'':
433 case '(': case ')': case '*': case '+': case ',': case '-':
434 case '.': case '/': case '0': case '1': case '2': case '3':
435 case '4': case '5': case '6': case '7': case '8': case '9':
436 case ':': case ';': case '<': case '=': case '>': case '?':
437 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
438 case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
439 case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
440 case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
441 case 'Y': case 'Z': case '[': case'\\': case ']': case '^':
442 case '_': case 'a': case 'b': case 'c': case 'd': case 'e':
443 case 'f': case 'g': case 'h': case 'i': case 'j': case 'k':
444 case 'l': case 'm': case 'n': case 'o': case 'p': case 'q':
445 case 'r': case 's': case 't': case 'u': case 'v': case 'w':
446 case 'x': case 'y': case 'z': case '{': case '|': case '}':
448 /* The C Standard requires these 98 characters (plus '%') to
449 be in the basic execution character set. None of these
450 characters can start a multibyte sequence, so they need
451 not be analyzed further. */
456 /* Copy this multibyte sequence until we reach its end, find
457 an error, or come back to the initial shift state. */
459 mbstate_t mbstate = mbstate_zero;
464 size_t bytes = mbrlen (f + len, (size_t) -1, &mbstate);
469 if (bytes == (size_t) -2 || bytes == (size_t) -1)
477 while (! mbsinit (&mbstate));
484 #else /* ! DO_MULTIBYTE */
486 /* Either multibyte encodings are not supported, or they are
487 safe for formats, so any non-'%' byte can be copied through. */
494 #endif /* ! DO_MULTIBYTE */
496 /* Check for flags that can modify a format. */
502 /* This influences the number formats. */
509 /* This changes textual output. */
520 /* As a GNU extension we allow to specify the field width. */
530 while (ISDIGIT (*f));
533 /* Check for modifiers. */
546 /* Now do the specified format. */
549 #define DO_NUMBER(d, v) \
550 digits = d; number_value = v; goto do_number
551 #define DO_NUMBER_SPACEPAD(d, v) \
552 digits = d; number_value = v; goto do_number_spacepad
563 cpy (aw_len, a_wkday);
569 cpy (wkday_len, f_wkday);
573 case 'h': /* POSIX.2 extension. */
576 cpy (am_len, a_month);
582 cpy (month_len, f_month);
589 if (! (modifier == 'E'
590 && *(subfmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT)) != '\0'))
591 subfmt = _NL_CURRENT (LC_TIME, D_T_FMT);
593 subfmt = "%a %b %e %H:%M:%S %Y";
599 size_t len = strftime (NULL, maxsize - i, subfmt, tp);
600 if (len == 0 && *subfmt)
602 add (len, strftime (p, maxsize - i, subfmt, tp));
605 while (old_start < p)
607 *old_start = TOUPPER (*old_start);
613 case 'C': /* POSIX.2 extension. */
616 #if HAVE_STRUCT_ERA_ENTRY
619 struct era_entry *era = _nl_get_era_entry (tp);
622 size_t len = strlen (era->name_fmt);
623 cpy (len, era->name_fmt);
629 int year = tp->tm_year + TM_YEAR_BASE;
630 DO_NUMBER (1, year / 100 - (year % 100 < 0));
637 if (! (modifier == 'E'
638 && *(subfmt = _NL_CURRENT (LC_TIME, ERA_D_FMT)) != '\0'))
639 subfmt = _NL_CURRENT (LC_TIME, D_FMT);
643 case 'D': /* POSIX.2 extension. */
653 DO_NUMBER (2, tp->tm_mday);
655 case 'e': /* POSIX.2 extension. */
659 DO_NUMBER_SPACEPAD (2, tp->tm_mday);
661 /* All numeric formats set DIGITS and NUMBER_VALUE and then
662 jump to one of these two labels. */
665 /* Force `_' flag unless overwritten by `0' flag. */
670 /* Format the number according to the MODIFIER flag. */
673 if (modifier == 'O' && 0 <= number_value)
675 /* Get the locale specific alternate representation of
676 the number NUMBER_VALUE. If none exist NULL is returned. */
677 const char *cp = _nl_get_alt_digit (number_value);
681 size_t digitlen = strlen (cp);
691 unsigned int u = number_value;
693 bufp = buf + sizeof (buf);
694 negative_number = number_value < 0;
700 *--bufp = u % 10 + '0';
701 while ((u /= 10) != 0);
704 do_number_sign_and_padding:
710 int padding = digits - (buf + sizeof (buf) - bufp);
714 while (0 < padding--)
719 bufp += negative_number;
720 while (0 < padding--)
727 cpy (buf + sizeof (buf) - bufp, bufp);
735 DO_NUMBER (2, tp->tm_hour);
741 DO_NUMBER (2, hour12);
743 case 'k': /* GNU extension. */
747 DO_NUMBER_SPACEPAD (2, tp->tm_hour);
749 case 'l': /* GNU extension. */
753 DO_NUMBER_SPACEPAD (2, hour12);
759 DO_NUMBER (3, 1 + tp->tm_yday);
765 DO_NUMBER (2, tp->tm_min);
771 DO_NUMBER (2, tp->tm_mon + 1);
773 case 'n': /* POSIX.2 extension. */
785 case 'R': /* GNU extension. */
789 case 'r': /* POSIX.2 extension. */
791 if (*(subfmt = _NL_CURRENT (LC_TIME, T_FMT_AMPM)) == '\0')
793 subfmt = "%I:%M:%S %p";
800 DO_NUMBER (2, tp->tm_sec);
802 case 's': /* GNU extension. */
810 /* Generate string value for T using time_t arithmetic;
811 this works even if sizeof (long) < sizeof (time_t). */
813 bufp = buf + sizeof (buf);
814 negative_number = t < 0;
825 /* Adjust if division truncates to minus infinity. */
826 if (0 < -1 % 10 && d < 0)
838 goto do_number_sign_and_padding;
845 if (! (modifier == 'E'
846 && *(subfmt = _NL_CURRENT (LC_TIME, ERA_T_FMT)) != '\0'))
847 subfmt = _NL_CURRENT (LC_TIME, T_FMT);
851 case 'T': /* POSIX.2 extension. */
855 case 't': /* POSIX.2 extension. */
859 case 'u': /* POSIX.2 extension. */
860 DO_NUMBER (1, (tp->tm_wday - 1 + 7) % 7 + 1);
866 DO_NUMBER (2, (tp->tm_yday - tp->tm_wday + 7) / 7);
869 case 'g': /* GNU extension. */
870 case 'G': /* GNU extension. */
874 int year = tp->tm_year + TM_YEAR_BASE;
875 int days = iso_week_days (tp->tm_yday, tp->tm_wday);
879 /* This ISO week belongs to the previous year. */
881 days = iso_week_days (tp->tm_yday + (365 + __isleap (year)),
886 int d = iso_week_days (tp->tm_yday - (365 + __isleap (year)),
890 /* This ISO week belongs to the next year. */
899 DO_NUMBER (2, (year % 100 + 100) % 100);
905 DO_NUMBER (2, days / 7 + 1);
913 DO_NUMBER (2, (tp->tm_yday - (tp->tm_wday - 1 + 7) % 7 + 7) / 7);
919 DO_NUMBER (1, tp->tm_wday);
922 #if HAVE_STRUCT_ERA_ENTRY
925 struct era_entry *era = _nl_get_era_entry (tp);
928 subfmt = strchr (era->name_fmt, '\0') + 1;
936 DO_NUMBER (1, tp->tm_year + TM_YEAR_BASE);
939 #if HAVE_STRUCT_ERA_ENTRY
942 struct era_entry *era = _nl_get_era_entry (tp);
945 int delta = tp->tm_year - era->start_date[0];
946 DO_NUMBER (1, (era->offset
947 + (era->direction == '-' ? -delta : delta)));
951 DO_NUMBER (2, (tp->tm_year % 100 + 100) % 100);
957 case 'z': /* GNU extension. */
958 if (tp->tm_isdst < 0)
964 diff = tp->tm_gmtoff;
973 if (lt == (time_t) -1)
975 /* mktime returns -1 for errors, but -1 is also a
976 valid time_t value. Check whether an error really
979 localtime_r (<, &tm);
981 if ((ltm.tm_sec ^ tm.tm_sec)
982 | (ltm.tm_min ^ tm.tm_min)
983 | (ltm.tm_hour ^ tm.tm_hour)
984 | (ltm.tm_mday ^ tm.tm_mday)
985 | (ltm.tm_mon ^ tm.tm_mon)
986 | (ltm.tm_year ^ tm.tm_year))
990 if (! gmtime_r (<, >m))
993 diff = tm_diff (<m, >m);
1005 DO_NUMBER (4, (diff / 60) * 100 + diff % 60);
1008 case '\0': /* GNU extension: % at end of format. */
1012 /* Unknown format; output the format, including the '%',
1013 since this is most likely the right thing to do if a
1014 multibyte string has been misparsed. */
1018 for (flen = 1; f[1 - flen] != '%'; flen++)
1020 cpy (flen, &f[1 - flen]);