1 /* Convert a string representation of time to a time value.
2 Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 3 of the
9 License, or (at your option) any later version.
11 The GNU C Library 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 Lesser General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 see <http://www.gnu.org/licenses/>. */
20 /* XXX This version of the implementation is not really complete.
21 Some of the fields cannot add information alone. But if seeing
22 some of them in the same format (such as year, week and weekday)
23 this is enough information for determining the date. */
26 #include "system/locale.h"
27 #include "system/time.h"
30 # if defined (__GNUC__) || (defined (__STDC__) && __STDC__)
31 # define __P(args) args
37 #if ! HAVE_LOCALTIME_R && ! defined localtime_r
39 # define localtime_r __localtime_r
41 /* Approximate localtime_r as best we can in its absence. */
42 # define localtime_r my_localtime_r
43 static struct tm
*localtime_r
__P ((const time_t *, struct tm
*));
49 struct tm
*l
= localtime (t
);
56 #endif /* ! HAVE_LOCALTIME_R && ! defined (localtime_r) */
59 #define match_char(ch1, ch2) if (ch1 != ch2) return NULL
60 #if defined __GNUC__ && __GNUC__ >= 2
61 # define match_string(cs1, s2) \
62 ({ size_t len = strlen (cs1); \
63 int result = strncasecmp ((cs1), (s2), len) == 0; \
64 if (result) (s2) += len; \
67 /* Oh come on. Get a reasonable compiler. */
68 # define match_string(cs1, s2) \
69 (strncasecmp ((cs1), (s2), strlen (cs1)) ? 0 : ((s2) += strlen (cs1), 1))
71 /* We intentionally do not use isdigit() for testing because this will
72 lead to problems with the wide character version. */
73 #define get_number(from, to, n) \
79 if (*rp < '0' || *rp > '9') \
84 } while (--__n > 0 && val * 10 <= to && *rp >= '0' && *rp <= '9'); \
85 if (val < from || val > to) \
89 # define get_alt_number(from, to, n) \
91 __label__ do_normal; \
92 if (*decided != raw) \
94 const char *alts = _NL_CURRENT (LC_TIME, ALT_DIGITS); \
102 while (*alts != '\0') \
104 size_t len = strlen (alts); \
105 if (strncasecmp (alts, rp, len) == 0) \
112 if (*decided == not && ! any) \
114 /* If we haven't read anything it's an error. */ \
117 /* Correct the premature multiplication. */ \
123 } while (--__n > 0 && val * 10 <= to); \
124 if (val < from || val > to) \
130 get_number (from, to, n); \
135 # define get_alt_number(from, to, n) \
136 /* We don't have the alternate representation. */ \
137 get_number(from, to, n)
139 #define recursive(new_fmt) \
140 (*(new_fmt) != '\0' \
141 && (rp = strptime_internal (rp, (new_fmt), tm, decided, era_cnt)) != NULL)
145 /* This is defined in locale/C-time.c in the GNU libc. */
146 extern const struct locale_data _nl_C_LC_TIME
;
147 extern const unsigned short int __mon_yday
[2][13];
149 # define weekday_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (DAY_1)].string)
150 # define ab_weekday_name \
151 (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)].string)
152 # define month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (MON_1)].string)
153 # define ab_month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)].string)
154 # define HERE_D_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_T_FMT)].string)
155 # define HERE_D_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_FMT)].string)
156 # define HERE_AM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (AM_STR)].string)
157 # define HERE_PM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (PM_STR)].string)
158 # define HERE_T_FMT_AMPM \
159 (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT_AMPM)].string)
160 # define HERE_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT)].string)
162 # define strncasecmp(s1, s2, n) __strncasecmp (s1, s2, n)
164 static char const weekday_name
[][10] =
166 "Sunday", "Monday", "Tuesday", "Wednesday",
167 "Thursday", "Friday", "Saturday"
169 static char const ab_weekday_name
[][4] =
171 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
173 static char const month_name
[][10] =
175 "January", "February", "March", "April", "May", "June",
176 "July", "August", "September", "October", "November", "December"
178 static char const ab_month_name
[][4] =
180 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
181 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
183 # define HERE_D_T_FMT "%a %b %e %H:%M:%S %Y"
184 # define HERE_D_FMT "%m/%d/%y"
185 # define HERE_AM_STR "AM"
186 # define HERE_PM_STR "PM"
187 # define HERE_T_FMT_AMPM "%I:%M:%S %p"
188 # define HERE_T_FMT "%H:%M:%S"
190 static const unsigned short int __mon_yday
[2][13] =
193 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
195 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
199 /* Status of lookup: do we use the locale data or the raw data? */
200 enum locale_status
{ not, loc
, raw
};
204 /* Nonzero if YEAR is a leap year (every 4 years,
205 except every 100th isn't, and every 400th is). */
206 # define __isleap(year) \
207 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
210 /* Compute the day of the week. */
212 day_of_the_week (struct tm
*tm
)
214 /* We know that January 1st 1970 was a Thursday (= 4). Compute the
215 the difference between this data in the one on TM and so determine
217 int corr_year
= 1900 + tm
->tm_year
- (tm
->tm_mon
< 2);
219 + (365 * (tm
->tm_year
- 70))
221 - ((corr_year
/ 4) / 25) + ((corr_year
/ 4) % 25 < 0)
222 + (((corr_year
/ 4) / 25) / 4)
223 + __mon_yday
[0][tm
->tm_mon
]
225 tm
->tm_wday
= ((wday
% 7) + 7) % 7;
228 /* Compute the day of the year. */
230 day_of_the_year (struct tm
*tm
)
232 tm
->tm_yday
= (__mon_yday
[__isleap (1900 + tm
->tm_year
)][tm
->tm_mon
]
233 + (tm
->tm_mday
- 1));
240 strptime_internal
__P ((const char *rp
, const char *fmt
, struct tm
*tm
,
241 enum locale_status
*decided
, int era_cnt
));
247 strptime_internal (rp
, fmt
, tm
, decided
, era_cnt
)
251 enum locale_status
*decided
;
257 int century
, want_century
;
259 int have_wday
, want_xday
;
261 int have_mon
, have_mday
;
263 const char *rp_backup
;
265 struct era_entry
*era
;
275 have_wday
= want_xday
= have_yday
= have_mon
= have_mday
= 0;
279 /* A white space in the format string matches 0 more or white
280 space in the input string. */
283 while (isspace (*rp
))
289 /* Any character but `%' must be matched by the same character
290 in the iput string. */
293 match_char (*fmt
++, *rp
++);
299 /* We need this for handling the `E' modifier. */
304 /* Make back up of current processing pointer. */
311 /* Match the `%' character itself. */
312 match_char ('%', *rp
++);
316 /* Match day of week. */
317 for (cnt
= 0; cnt
< 7; ++cnt
)
322 if (match_string (_NL_CURRENT (LC_TIME
, DAY_1
+ cnt
), rp
))
325 && strcmp (_NL_CURRENT (LC_TIME
, DAY_1
+ cnt
),
330 if (match_string (_NL_CURRENT (LC_TIME
, ABDAY_1
+ cnt
), rp
))
333 && strcmp (_NL_CURRENT (LC_TIME
, ABDAY_1
+ cnt
),
334 ab_weekday_name
[cnt
]))
341 && (match_string (weekday_name
[cnt
], rp
)
342 || match_string (ab_weekday_name
[cnt
], rp
)))
349 /* Does not match a weekday name. */
357 /* Match month name. */
358 for (cnt
= 0; cnt
< 12; ++cnt
)
363 if (match_string (_NL_CURRENT (LC_TIME
, MON_1
+ cnt
), rp
))
366 && strcmp (_NL_CURRENT (LC_TIME
, MON_1
+ cnt
),
371 if (match_string (_NL_CURRENT (LC_TIME
, ABMON_1
+ cnt
), rp
))
374 && strcmp (_NL_CURRENT (LC_TIME
, ABMON_1
+ cnt
),
381 if (match_string (month_name
[cnt
], rp
)
382 || match_string (ab_month_name
[cnt
], rp
))
389 /* Does not match a month name. */
395 /* Match locale's date and time format. */
399 if (!recursive (_NL_CURRENT (LC_TIME
, D_T_FMT
)))
408 if (*decided
== not &&
409 strcmp (_NL_CURRENT (LC_TIME
, D_T_FMT
), HERE_D_T_FMT
))
417 if (!recursive (HERE_D_T_FMT
))
422 /* Match century number. */
426 get_number (0, 99, 2);
432 /* Match day of month. */
433 get_number (1, 31, 2);
439 if (!recursive ("%Y-%m-%d"))
447 if (!recursive (_NL_CURRENT (LC_TIME
, D_FMT
)))
457 && strcmp (_NL_CURRENT (LC_TIME
, D_FMT
), HERE_D_FMT
))
468 /* Match standard day format. */
469 if (!recursive (HERE_D_FMT
))
475 /* Match hour in 24-hour clock. */
476 get_number (0, 23, 2);
481 /* Match hour in 12-hour clock. */
482 get_number (1, 12, 2);
483 tm
->tm_hour
= val
% 12;
487 /* Match day number of year. */
488 get_number (1, 366, 3);
489 tm
->tm_yday
= val
- 1;
493 /* Match number of month. */
494 get_number (1, 12, 2);
495 tm
->tm_mon
= val
- 1;
501 get_number (0, 59, 2);
506 /* Match any white space. */
507 while (isspace (*rp
))
511 /* Match locale's equivalent of AM/PM. */
515 if (match_string (_NL_CURRENT (LC_TIME
, AM_STR
), rp
))
517 if (strcmp (_NL_CURRENT (LC_TIME
, AM_STR
), HERE_AM_STR
))
521 if (match_string (_NL_CURRENT (LC_TIME
, PM_STR
), rp
))
523 if (strcmp (_NL_CURRENT (LC_TIME
, PM_STR
), HERE_PM_STR
))
531 if (!match_string (HERE_AM_STR
, rp
)) {
532 if (match_string (HERE_PM_STR
, rp
)) {
543 if (!recursive (_NL_CURRENT (LC_TIME
, T_FMT_AMPM
)))
552 if (*decided
== not &&
553 strcmp (_NL_CURRENT (LC_TIME
, T_FMT_AMPM
),
561 if (!recursive (HERE_T_FMT_AMPM
))
565 if (!recursive ("%H:%M"))
570 /* The number of seconds may be very high so we cannot use
571 the `get_number' macro. Instead read the number
572 character for character and construct the result while
575 if (*rp
< '0' || *rp
> '9')
576 /* We need at least one digit. */
584 while (*rp
>= '0' && *rp
<= '9');
586 if (localtime_r (&secs
, tm
) == NULL
)
587 /* Error in function. */
592 get_number (0, 61, 2);
599 if (!recursive (_NL_CURRENT (LC_TIME
, T_FMT
)))
608 if (strcmp (_NL_CURRENT (LC_TIME
, T_FMT
), HERE_T_FMT
))
618 if (!recursive (HERE_T_FMT
))
622 get_number (1, 7, 1);
623 tm
->tm_wday
= val
% 7;
627 get_number (0, 99, 2);
628 /* XXX This cannot determine any field in TM. */
631 if (*rp
< '0' || *rp
> '9')
633 /* XXX Ignore the number since we would need some more
634 information to compute a real date. */
637 while (*rp
>= '0' && *rp
<= '9');
642 get_number (0, 53, 2);
643 /* XXX This cannot determine any field in TM without some
647 /* Match number of weekday. */
648 get_number (0, 6, 1);
654 match_year_in_century
:
656 /* Match year within century. */
657 get_number (0, 99, 2);
658 /* The "Year 2000: The Millennium Rollover" paper suggests that
659 values in the range 69-99 refer to the twentieth century. */
660 tm
->tm_year
= val
>= 69 ? val
: val
+ 100;
661 /* Indicate that we want to use the century, if specified. */
666 /* Match year including century number. */
667 get_number (0, 9999, 4);
668 tm
->tm_year
= val
- 1900;
673 /* XXX How to handle this? */
680 /* Match locale's alternate date and time format. */
683 const char *fmt
= _NL_CURRENT (LC_TIME
, ERA_D_T_FMT
);
686 fmt
= _NL_CURRENT (LC_TIME
, D_T_FMT
);
688 if (!recursive (fmt
))
697 if (strcmp (fmt
, HERE_D_T_FMT
))
704 /* The C locale has no era information, so use the
705 normal representation. */
706 if (!recursive (HERE_D_T_FMT
))
715 era
= _nl_select_era_entry (era_cnt
);
716 if (match_string (era
->era_name
, rp
))
726 num_eras
= _NL_CURRENT_WORD (LC_TIME
,
727 _NL_TIME_ERA_NUM_ENTRIES
);
728 for (era_cnt
= 0; era_cnt
< (int) num_eras
;
729 ++era_cnt
, rp
= rp_backup
)
731 era
= _nl_select_era_entry (era_cnt
);
732 if (match_string (era
->era_name
, rp
))
738 if (era_cnt
== (int) num_eras
)
750 /* The C locale has no era information, so use the
751 normal representation. */
755 goto match_year_in_century
;
757 get_number(0, 9999, 4);
765 num_eras
= _NL_CURRENT_WORD (LC_TIME
,
766 _NL_TIME_ERA_NUM_ENTRIES
);
767 for (era_cnt
= 0; era_cnt
< (int) num_eras
;
768 ++era_cnt
, rp
= rp_backup
)
770 era
= _nl_select_era_entry (era_cnt
);
771 if (recursive (era
->era_format
))
774 if (era_cnt
== (int) num_eras
)
791 get_number (0, 9999, 4);
792 tm
->tm_year
= val
- 1900;
799 const char *fmt
= _NL_CURRENT (LC_TIME
, ERA_D_FMT
);
802 fmt
= _NL_CURRENT (LC_TIME
, D_FMT
);
804 if (!recursive (fmt
))
813 if (strcmp (fmt
, HERE_D_FMT
))
819 if (!recursive (HERE_D_FMT
))
825 const char *fmt
= _NL_CURRENT (LC_TIME
, ERA_T_FMT
);
828 fmt
= _NL_CURRENT (LC_TIME
, T_FMT
);
830 if (!recursive (fmt
))
839 if (strcmp (fmt
, HERE_T_FMT
))
845 if (!recursive (HERE_T_FMT
))
853 /* We have no information about the era format. Just use
854 the normal format. */
855 if (*fmt
!= 'c' && *fmt
!= 'C' && *fmt
!= 'y' && *fmt
!= 'Y'
856 && *fmt
!= 'x' && *fmt
!= 'X')
857 /* This is an illegal format. */
867 /* Match day of month using alternate numeric symbols. */
868 get_alt_number (1, 31, 2);
874 /* Match hour in 24-hour clock using alternate numeric
876 get_alt_number (0, 23, 2);
881 /* Match hour in 12-hour clock using alternate numeric
883 get_alt_number (1, 12, 2);
884 tm
->tm_hour
= val
- 1;
888 /* Match month using alternate numeric symbols. */
889 get_alt_number (1, 12, 2);
890 tm
->tm_mon
= val
- 1;
895 /* Match minutes using alternate numeric symbols. */
896 get_alt_number (0, 59, 2);
900 /* Match seconds using alternate numeric symbols. */
901 get_alt_number (0, 61, 2);
907 get_alt_number (0, 53, 2);
908 /* XXX This cannot determine any field in TM without
909 further information. */
912 /* Match number of weekday using alternate numeric symbols. */
913 get_alt_number (0, 6, 1);
918 /* Match year within century using alternate numeric symbols. */
919 get_alt_number (0, 99, 2);
920 tm
->tm_year
= val
>= 69 ? val
: val
+ 100;
938 tm
->tm_year
= tm
->tm_year
% 100 + (century
- 19) * 100;
940 /* Only the century, but not the year. Strange, but so be it. */
941 tm
->tm_year
= (century
- 19) * 100;
947 era
= _nl_select_era_entry(era_cnt
);
949 tm
->tm_year
= (era
->start_date
[0]
950 + ((tm
->tm_year
- era
->offset
)
951 * era
->absolute_direction
));
953 /* Era start year assumed. */
954 tm
->tm_year
= era
->start_date
[0];
961 if (want_xday
&& !have_wday
)
963 if ( !(have_mon
&& have_mday
) && have_yday
)
965 /* We don't have tm_mon and/or tm_mday, compute them. */
967 while (__mon_yday
[__isleap(1900 + tm
->tm_year
)][t_mon
] <= tm
->tm_yday
)
970 tm
->tm_mon
= t_mon
- 1;
974 - __mon_yday
[__isleap(1900 + tm
->tm_year
)][t_mon
- 1] + 1);
976 day_of_the_week (tm
);
978 if (want_xday
&& !have_yday
)
979 day_of_the_year (tm
);
981 return discard_const_p(char, rp
);
985 char *rep_strptime(const char *buf
, const char *format
, struct tm
*tm
)
987 enum locale_status decided
;
994 return strptime_internal (buf
, format
, tm
, &decided
, -1);