1 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
24 # define HAVE_LIMITS_H 1
26 # define HAVE_MBRLEN 1
27 # define HAVE_STRUCT_ERA_ENTRY 1
28 # define HAVE_TM_GMTOFF 1
29 # define HAVE_TM_ZONE 1
30 # define HAVE_TZNAME 1
32 # define MULTIBYTE_IS_FORMAT_SAFE 1
33 # define STDC_HEADERS 1
34 # include "../locale/localeinfo.h"
38 #include <sys/types.h> /* Some systems define `time_t' here. */
40 #ifdef TIME_WITH_SYS_TIME
41 # include <sys/time.h>
44 # ifdef HAVE_SYS_TIME_H
45 # include <sys/time.h>
51 extern char *tzname[];
54 /* Do multibyte processing if multibytes are supported, unless
55 multibyte sequences are safe in formats. Multibyte sequences are
56 safe if they cannot contain byte sequences that look like format
57 conversion specifications. The GNU C Library uses UTF8 multibyte
58 encoding, which is safe for formats, but strftime.c can be used
59 with other C libraries that use unsafe encodings. */
60 #define DO_MULTIBYTE (HAVE_MBLEN && ! MULTIBYTE_IS_FORMAT_SAFE)
66 /* Simulate mbrlen with mblen as best we can. */
67 # define mbstate_t int
68 # define mbrlen(s, n, ps) mblen (s, n)
69 # define mbsinit(ps) (*(ps) == 0)
71 static const mbstate_t mbstate_zero;
84 # 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] = " ";
179 static const char zeroes[16] = "0000000000000000";
181 # define memset_space(P, Len) \
187 int _this = _len > 16 ? 16 : _len; \
188 memcpy ((P), spaces, _this); \
195 # define memset_zero(P, Len) \
201 int _this = _len > 16 ? 16 : _len; \
202 memcpy ((P), zeroes, _this); \
209 # define memset_space(P, Len) (memset ((P), ' ', (Len)), (P) += (Len))
210 # define memset_zero(P, Len) (memset ((P), '0', (Len)), (P) += (Len))
217 int _delta = width - _n; \
218 int _incr = _n + (_delta > 0 ? _delta : 0); \
219 if (i + _incr >= maxsize) \
226 memset_zero (p, _delta); \
228 memset_space (p, _delta); \
239 memcpy_lowcase (p, (s), _n); \
240 else if (to_uppcase) \
241 memcpy_uppcase (p, (s), _n); \
243 memcpy ((PTR) p, (PTR) (s), _n))
248 # define TOUPPER(Ch) toupper (Ch)
249 # define TOLOWER(Ch) tolower (Ch)
251 # define TOUPPER(Ch) (islower (Ch) ? toupper (Ch) : (Ch))
252 # define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
254 /* We don't use `isdigit' here since the locale dependent
255 interpretation is not what we want here. We only need to accept
256 the arabic digits in the ASCII range. One day there is perhaps a
257 more reliable way to accept other sets of digits. */
258 #define ISDIGIT(Ch) ((unsigned int) (Ch) - '0' <= 9)
260 static char *memcpy_lowcase __P ((char *dest, const char *src, size_t len));
263 memcpy_lowcase (dest, src, len)
269 dest[len] = TOLOWER (src[len]);
273 static char *memcpy_uppcase __P ((char *dest, const char *src, size_t len));
276 memcpy_uppcase (dest, src, len)
282 dest[len] = TOUPPER (src[len]);
288 /* Yield the difference between *A and *B,
289 measured in seconds, ignoring leap seconds. */
290 static int tm_diff __P ((const struct tm *, const struct tm *));
296 /* Compute intervening leap days correctly even if year is negative.
297 Take care to avoid int overflow in leap day calculations,
298 but it's OK to assume that A and B are close to each other. */
299 int a4 = (a->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (a->tm_year & 3);
300 int b4 = (b->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (b->tm_year & 3);
301 int a100 = a4 / 25 - (a4 % 25 < 0);
302 int b100 = b4 / 25 - (b4 % 25 < 0);
303 int a400 = a100 >> 2;
304 int b400 = b100 >> 2;
305 int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
306 int years = a->tm_year - b->tm_year;
307 int days = (365 * years + intervening_leap_days
308 + (a->tm_yday - b->tm_yday));
309 return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
310 + (a->tm_min - b->tm_min))
311 + (a->tm_sec - b->tm_sec));
313 #endif /* ! HAVE_TM_GMTOFF */
317 /* The number of days from the first day of the first ISO week of this
318 year to the year day YDAY with week day WDAY. ISO weeks start on
319 Monday; the first ISO week has the year's first Thursday. YDAY may
320 be as small as YDAY_MINIMUM. */
321 #define ISO_WEEK_START_WDAY 1 /* Monday */
322 #define ISO_WEEK1_WDAY 4 /* Thursday */
323 #define YDAY_MINIMUM (-366)
324 static int iso_week_days __P ((int, int));
329 iso_week_days (yday, wday)
333 /* Add enough to the first operand of % to make it nonnegative. */
334 int big_enough_multiple_of_7 = (-YDAY_MINIMUM / 7 + 2) * 7;
336 - (yday - wday + ISO_WEEK1_WDAY + big_enough_multiple_of_7) % 7
337 + ISO_WEEK1_WDAY - ISO_WEEK_START_WDAY);
342 static char const weekday_name[][10] =
344 "Sunday", "Monday", "Tuesday", "Wednesday",
345 "Thursday", "Friday", "Saturday"
347 static char const month_name[][10] =
349 "January", "February", "March", "April", "May", "June",
350 "July", "August", "September", "October", "November", "December"
355 #if !defined _LIBC && HAVE_TZNAME && HAVE_TZSET
356 /* Solaris 2.5 tzset sometimes modifies the storage returned by localtime.
357 Work around this bug by copying *tp before it might be munged. */
358 size_t _strftime_copytm __P ((char *, size_t, const char *,
361 strftime (s, maxsize, format, tp)
369 return _strftime_copytm (s, maxsize, format, &tmcopy);
374 # define strftime(S, Maxsize, Format, Tp) \
375 _strftime_copytm (S, Maxsize, Format, Tp)
379 /* Write information from TP into S according to the format
380 string FORMAT, writing no more that MAXSIZE characters
381 (including the terminating '\0') and returning number of
382 characters written. If S is NULL, nothing will be written
383 anywhere, so to determine how many characters would be
384 written, use NULL for S and (size_t) UINT_MAX for MAXSIZE. */
386 strftime (s, maxsize, format, tp)
392 int hour12 = tp->tm_hour;
394 const char *const a_wkday = _NL_CURRENT (LC_TIME, ABDAY_1 + tp->tm_wday);
395 const char *const f_wkday = _NL_CURRENT (LC_TIME, DAY_1 + tp->tm_wday);
396 const char *const a_month = _NL_CURRENT (LC_TIME, ABMON_1 + tp->tm_mon);
397 const char *const f_month = _NL_CURRENT (LC_TIME, MON_1 + tp->tm_mon);
398 const char *const ampm = _NL_CURRENT (LC_TIME,
399 hour12 > 11 ? PM_STR : AM_STR);
400 size_t aw_len = strlen (a_wkday);
401 size_t am_len = strlen (a_month);
402 size_t ap_len = strlen (ampm);
404 const char *const f_wkday = weekday_name[tp->tm_wday];
405 const char *const f_month = month_name[tp->tm_mon];
406 const char *const a_wkday = f_wkday;
407 const char *const a_month = f_month;
408 const char *const ampm = "AMPM" + 2 * (hour12 > 11);
413 size_t wkday_len = strlen (f_wkday);
414 size_t month_len = strlen (f_month);
422 #if !defined _LIBC && HAVE_TM_ZONE
423 /* XXX We have some problems here. First, the string pointed to by
424 tm_zone is dynamically allocated while loading the zone data. But
425 when another zone is loaded since the information in TP were
426 computed this would be a stale pointer.
427 The second problem is the POSIX test suite which assumes setting
428 the environment variable TZ to a new value before calling strftime()
429 will influence the result (the %Z format) even if the information in
430 TP is computed with a totally different time zone. --drepper@gnu */
431 zone = (const char *) tp->tm_zone;
434 /* POSIX.1 8.1.1 requires that whenever strftime() is called, the
435 time zone names contained in the external variable `tzname' shall
436 be set as if the tzset() function had been called. */
441 if (!(zone && *zone) && tp->tm_isdst >= 0)
442 zone = tzname[tp->tm_isdst];
445 zone = ""; /* POSIX.2 requires the empty string here. */
447 zonelen = strlen (zone);
452 if (hour12 == 0) hour12 = 12;
454 for (f = format; *f != '\0'; ++f)
456 int pad; /* Padding for number ('-', '_', or 0). */
457 int modifier; /* Field modifier ('E', 'O', or 0). */
458 int digits; /* Max digits for numeric format. */
459 int number_value; /* Numeric value to be printed. */
460 int negative_number; /* 1 if the number is negative. */
463 char buf[1 + (sizeof (int) < sizeof (time_t)
464 ? INT_STRLEN_BOUND (time_t)
465 : INT_STRLEN_BOUND (int))];
478 case '\a': case '\b': case '\t': case '\n':
479 case '\v': case '\f': case '\r':
480 case ' ': case '!': case '"': case '#': case '&': case'\'':
481 case '(': case ')': case '*': case '+': case ',': case '-':
482 case '.': case '/': case '0': case '1': case '2': case '3':
483 case '4': case '5': case '6': case '7': case '8': case '9':
484 case ':': case ';': case '<': case '=': case '>': case '?':
485 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
486 case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
487 case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
488 case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
489 case 'Y': case 'Z': case '[': case'\\': case ']': case '^':
490 case '_': case 'a': case 'b': case 'c': case 'd': case 'e':
491 case 'f': case 'g': case 'h': case 'i': case 'j': case 'k':
492 case 'l': case 'm': case 'n': case 'o': case 'p': case 'q':
493 case 'r': case 's': case 't': case 'u': case 'v': case 'w':
494 case 'x': case 'y': case 'z': case '{': case '|': case '}':
496 /* The C Standard requires these 98 characters (plus '%') to
497 be in the basic execution character set. None of these
498 characters can start a multibyte sequence, so they need
499 not be analyzed further. */
504 /* Copy this multibyte sequence until we reach its end, find
505 an error, or come back to the initial shift state. */
507 mbstate_t mbstate = mbstate_zero;
512 size_t bytes = mbrlen (f + len, (size_t) -1, &mbstate);
517 if (bytes == (size_t) -2 || bytes == (size_t) -1)
525 while (! mbsinit (&mbstate));
532 #else /* ! DO_MULTIBYTE */
534 /* Either multibyte encodings are not supported, or they are
535 safe for formats, so any non-'%' byte can be copied through. */
542 #endif /* ! DO_MULTIBYTE */
544 /* Check for flags that can modify a format. */
550 /* This influences the number formats. */
557 /* This changes textual output. */
571 /* As a GNU extension we allow to specify the field width. */
581 while (ISDIGIT (*f));
584 /* Check for modifiers. */
597 /* Now do the specified format. */
600 #define DO_NUMBER(d, v) \
601 digits = width == -1 ? d : width; \
602 number_value = v; goto do_number
603 #define DO_NUMBER_SPACEPAD(d, v) \
604 digits = width == -1 ? d : width; \
605 number_value = v; goto do_number_spacepad
621 cpy (aw_len, a_wkday);
632 cpy (wkday_len, f_wkday);
636 case 'h': /* POSIX.2 extension. */
639 cpy (am_len, a_month);
650 cpy (month_len, f_month);
657 if (! (modifier == 'E'
658 && *(subfmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT)) != '\0'))
659 subfmt = _NL_CURRENT (LC_TIME, D_T_FMT);
661 subfmt = "%a %b %e %H:%M:%S %Y";
667 size_t len = strftime (NULL, maxsize - i, subfmt, tp);
668 if (len == 0 && *subfmt)
670 add (len, strftime (p, maxsize - i, subfmt, tp));
673 while (old_start < p)
675 *old_start = TOUPPER (*old_start);
681 case 'C': /* POSIX.2 extension. */
684 #if HAVE_STRUCT_ERA_ENTRY
687 struct era_entry *era = _nl_get_era_entry (tp);
690 size_t len = strlen (era->name_fmt);
691 cpy (len, era->name_fmt);
697 int year = tp->tm_year + TM_YEAR_BASE;
698 DO_NUMBER (1, year / 100 - (year % 100 < 0));
705 if (! (modifier == 'E'
706 && *(subfmt = _NL_CURRENT (LC_TIME, ERA_D_FMT)) != '\0'))
707 subfmt = _NL_CURRENT (LC_TIME, D_FMT);
711 case 'D': /* POSIX.2 extension. */
721 DO_NUMBER (2, tp->tm_mday);
723 case 'e': /* POSIX.2 extension. */
727 DO_NUMBER_SPACEPAD (2, tp->tm_mday);
729 /* All numeric formats set DIGITS and NUMBER_VALUE and then
730 jump to one of these two labels. */
733 /* Force `_' flag unless overwritten by `0' flag. */
738 /* Format the number according to the MODIFIER flag. */
741 if (modifier == 'O' && 0 <= number_value)
743 /* Get the locale specific alternate representation of
744 the number NUMBER_VALUE. If none exist NULL is returned. */
745 const char *cp = _nl_get_alt_digit (number_value);
749 size_t digitlen = strlen (cp);
759 unsigned int u = number_value;
761 bufp = buf + sizeof (buf);
762 negative_number = number_value < 0;
768 *--bufp = u % 10 + '0';
769 while ((u /= 10) != 0);
772 do_number_sign_and_padding:
778 int padding = digits - (buf + sizeof (buf) - bufp);
782 while (0 < padding--)
787 bufp += negative_number;
788 while (0 < padding--)
795 cpy (buf + sizeof (buf) - bufp, bufp);
803 DO_NUMBER (2, tp->tm_hour);
809 DO_NUMBER (2, hour12);
811 case 'k': /* GNU extension. */
815 DO_NUMBER_SPACEPAD (2, tp->tm_hour);
817 case 'l': /* GNU extension. */
821 DO_NUMBER_SPACEPAD (2, hour12);
827 DO_NUMBER (3, 1 + tp->tm_yday);
833 DO_NUMBER (2, tp->tm_min);
839 DO_NUMBER (2, tp->tm_mon + 1);
841 case 'n': /* POSIX.2 extension. */
858 case 'R': /* GNU extension. */
862 case 'r': /* POSIX.2 extension. */
864 if (*(subfmt = _NL_CURRENT (LC_TIME, T_FMT_AMPM)) == '\0')
866 subfmt = "%I:%M:%S %p";
873 DO_NUMBER (2, tp->tm_sec);
875 case 's': /* GNU extension. */
883 /* Generate string value for T using time_t arithmetic;
884 this works even if sizeof (long) < sizeof (time_t). */
886 bufp = buf + sizeof (buf);
887 negative_number = t < 0;
898 /* Adjust if division truncates to minus infinity. */
899 if (0 < -1 % 10 && d < 0)
911 goto do_number_sign_and_padding;
918 if (! (modifier == 'E'
919 && *(subfmt = _NL_CURRENT (LC_TIME, ERA_T_FMT)) != '\0'))
920 subfmt = _NL_CURRENT (LC_TIME, T_FMT);
924 case 'T': /* POSIX.2 extension. */
928 case 't': /* POSIX.2 extension. */
932 case 'u': /* POSIX.2 extension. */
933 DO_NUMBER (1, (tp->tm_wday - 1 + 7) % 7 + 1);
939 DO_NUMBER (2, (tp->tm_yday - tp->tm_wday + 7) / 7);
942 case 'g': /* GNU extension. */
943 case 'G': /* GNU extension. */
947 int year = tp->tm_year + TM_YEAR_BASE;
948 int days = iso_week_days (tp->tm_yday, tp->tm_wday);
952 /* This ISO week belongs to the previous year. */
954 days = iso_week_days (tp->tm_yday + (365 + __isleap (year)),
959 int d = iso_week_days (tp->tm_yday - (365 + __isleap (year)),
963 /* This ISO week belongs to the next year. */
972 DO_NUMBER (2, (year % 100 + 100) % 100);
978 DO_NUMBER (2, days / 7 + 1);
986 DO_NUMBER (2, (tp->tm_yday - (tp->tm_wday - 1 + 7) % 7 + 7) / 7);
992 DO_NUMBER (1, tp->tm_wday);
995 #if HAVE_STRUCT_ERA_ENTRY
998 struct era_entry *era = _nl_get_era_entry (tp);
1001 subfmt = strchr (era->name_fmt, '\0') + 1;
1006 if (modifier == 'O')
1009 DO_NUMBER (1, tp->tm_year + TM_YEAR_BASE);
1012 #if HAVE_STRUCT_ERA_ENTRY
1013 if (modifier == 'E')
1015 struct era_entry *era = _nl_get_era_entry (tp);
1018 int delta = tp->tm_year - era->start_date[0];
1019 DO_NUMBER (1, (era->offset
1020 + (era->direction == '-' ? -delta : delta)));
1024 DO_NUMBER (2, (tp->tm_year % 100 + 100) % 100);
1032 cpy (zonelen, zone);
1035 case 'z': /* GNU extension. */
1036 if (tp->tm_isdst < 0)
1042 diff = tp->tm_gmtoff;
1051 if (lt == (time_t) -1)
1053 /* mktime returns -1 for errors, but -1 is also a
1054 valid time_t value. Check whether an error really
1057 localtime_r (<, &tm);
1059 if ((ltm.tm_sec ^ tm.tm_sec)
1060 | (ltm.tm_min ^ tm.tm_min)
1061 | (ltm.tm_hour ^ tm.tm_hour)
1062 | (ltm.tm_mday ^ tm.tm_mday)
1063 | (ltm.tm_mon ^ tm.tm_mon)
1064 | (ltm.tm_year ^ tm.tm_year))
1068 if (! gmtime_r (<, >m))
1071 diff = tm_diff (<m, >m);
1083 DO_NUMBER (4, (diff / 60) * 100 + diff % 60);
1086 case '\0': /* GNU extension: % at end of format. */
1090 /* Unknown format; output the format, including the '%',
1091 since this is most likely the right thing to do if a
1092 multibyte string has been misparsed. */
1096 for (flen = 1; f[1 - flen] != '%'; flen++)
1098 cpy (flen, &f[1 - flen]);