1 /* Convert a string representation of time to a time value.
2 Copyright (C) 1996, 1997, 1998 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 Library General Public License as
8 published by the Free Software Foundation; either version 2 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 Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* XXX This version of the implementation is not really complete.
22 Some of the fields cannot add information alone. But if seeing
23 some of them in the same format (such as year, week and weekday)
24 this is enough information for determining the date. */
37 # include "../locale/localeinfo.h"
42 # if defined (__GNUC__) || (defined (__STDC__) && __STDC__)
43 # define __P(args) args
49 #if ! HAVE_LOCALTIME_R && ! defined (localtime_r)
51 #define localtime_r __localtime_r
53 /* Approximate localtime_r as best we can in its absence. */
54 #define localtime_r my_localtime_r
55 static struct tm *localtime_r __P ((const time_t *, struct tm *));
61 struct tm *l = localtime (t);
68 #endif /* ! HAVE_LOCALTIME_R && ! defined (localtime_r) */
71 #define match_char(ch1, ch2) if (ch1 != ch2) return NULL
72 #if defined __GNUC__ && __GNUC__ >= 2
73 # define match_string(cs1, s2) \
74 ({ size_t len = strlen (cs1); \
75 int result = strncasecmp ((cs1), (s2), len) == 0; \
76 if (result) (s2) += len; \
79 /* Oh come on. Get a reasonable compiler. */
80 # define match_string(cs1, s2) \
81 (strncasecmp ((cs1), (s2), strlen (cs1)) ? 0 : ((s2) += strlen (cs1), 1))
83 /* We intentionally do not use isdigit() for testing because this will
84 lead to problems with the wide character version. */
85 #define get_number(from, to) \
88 if (*rp < '0' || *rp > '9') \
93 } while (val * 10 <= to && *rp >= '0' && *rp <= '9'); \
94 if (val < from || val > to) \
98 # define get_alt_number(from, to) \
100 if (*decided != raw) \
102 const char *alts = _NL_CURRENT (LC_TIME, ALT_DIGITS); \
104 while (*alts != '\0') \
106 size_t len = strlen (alts); \
107 if (strncasecmp (alts, rp, len) == 0) \
109 alts = strchr (alts, '\0') + 1; \
114 if (*decided == loc && val != 0) \
123 get_number (from, to); \
126 # define get_alt_number(from, to) \
127 /* We don't have the alternate representation. */ \
130 #define recursive(new_fmt) \
131 (*(new_fmt) != '\0' \
132 && (rp = strptime_internal (rp, (new_fmt), tm, decided)) != NULL)
136 /* This is defined in locale/C-time.c in the GNU libc. */
137 extern const struct locale_data _nl_C_LC_TIME;
139 # define weekday_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (DAY_1)].string)
140 # define ab_weekday_name \
141 (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)].string)
142 # define month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (MON_1)].string)
143 # define ab_month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)].string)
144 # define HERE_D_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_T_FMT)].string)
145 # define HERE_D_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_FMT)].string)
146 # define HERE_AM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (AM_STR)].string)
147 # define HERE_PM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (PM_STR)].string)
148 # define HERE_T_FMT_AMPM \
149 (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT_AMPM)].string)
150 # define HERE_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT)].string)
152 # define strncasecmp(s1, s2, n) __strncasecmp (s1, s2, n)
154 static char const weekday_name[][10] =
156 "Sunday", "Monday", "Tuesday", "Wednesday",
157 "Thursday", "Friday", "Saturday"
159 static char const ab_weekday_name[][4] =
161 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
163 static char const month_name[][10] =
165 "January", "February", "March", "April", "May", "June",
166 "July", "August", "September", "October", "November", "December"
168 static char const ab_month_name[][4] =
170 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
171 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
173 # define HERE_D_T_FMT "%a %b %e %H:%M:%S %Y"
174 # define HERE_D_FMT "%m/%d/%y"
175 # define HERE_AM_STR "AM"
176 # define HERE_PM_STR "PM"
177 # define HERE_T_FMT_AMPM "%I:%M:%S %p"
178 # define HERE_T_FMT "%H:%M:%S"
181 /* Status of lookup: do we use the locale data or the raw data? */
182 enum locale_status { not, loc, raw };
188 strptime_internal __P ((const char *buf, const char *format, struct tm *tm,
189 enum locale_status *decided));
195 strptime_internal (buf, format, tm, decided)
199 enum locale_status *decided;
206 int century, want_century;
216 /* A white space in the format string matches 0 more or white
217 space in the input string. */
220 while (isspace (*rp))
226 /* Any character but `%' must be matched by the same character
227 in the iput string. */
230 match_char (*fmt++, *rp++);
236 /* We need this for handling the `E' modifier. */
242 /* Match the `%' character itself. */
243 match_char ('%', *rp++);
247 /* Match day of week. */
248 for (cnt = 0; cnt < 7; ++cnt)
253 if (match_string (_NL_CURRENT (LC_TIME, DAY_1 + cnt), rp))
256 && strcmp (_NL_CURRENT (LC_TIME, DAY_1 + cnt),
261 if (match_string (_NL_CURRENT (LC_TIME, ABDAY_1 + cnt), rp))
264 && strcmp (_NL_CURRENT (LC_TIME, ABDAY_1 + cnt),
265 ab_weekday_name[cnt]))
272 && (match_string (weekday_name[cnt], rp)
273 || match_string (ab_weekday_name[cnt], rp)))
280 /* Does not match a weekday name. */
287 /* Match month name. */
288 for (cnt = 0; cnt < 12; ++cnt)
293 if (match_string (_NL_CURRENT (LC_TIME, MON_1 + cnt), rp))
296 && strcmp (_NL_CURRENT (LC_TIME, MON_1 + cnt),
301 if (match_string (_NL_CURRENT (LC_TIME, ABMON_1 + cnt), rp))
304 && strcmp (_NL_CURRENT (LC_TIME, ABMON_1 + cnt),
311 if (match_string (month_name[cnt], rp)
312 || match_string (ab_month_name[cnt], rp))
319 /* Does not match a month name. */
324 /* Match locale's date and time format. */
328 if (!recursive (_NL_CURRENT (LC_TIME, D_T_FMT)))
335 if (*decided == not &&
336 strcmp (_NL_CURRENT (LC_TIME, D_T_FMT), HERE_D_T_FMT))
343 if (!recursive (HERE_D_T_FMT))
347 /* Match century number. */
353 /* Match day of month. */
361 if (!recursive (_NL_CURRENT (LC_TIME, D_FMT)))
369 && strcmp (_NL_CURRENT (LC_TIME, D_FMT), HERE_D_FMT))
378 /* Match standard day format. */
379 if (!recursive (HERE_D_FMT))
383 /* Match hour in 24-hour clock. */
389 /* Match hour in 12-hour clock. */
391 tm->tm_hour = val % 12;
395 /* Match day number of year. */
397 tm->tm_yday = val - 1;
400 /* Match number of month. */
402 tm->tm_mon = val - 1;
411 /* Match any white space. */
412 while (isspace (*rp))
416 /* Match locale's equivalent of AM/PM. */
420 if (match_string (_NL_CURRENT (LC_TIME, AM_STR), rp))
422 if (strcmp (_NL_CURRENT (LC_TIME, AM_STR), HERE_AM_STR))
426 if (match_string (_NL_CURRENT (LC_TIME, PM_STR), rp))
428 if (strcmp (_NL_CURRENT (LC_TIME, PM_STR), HERE_PM_STR))
436 if (!match_string (HERE_AM_STR, rp))
437 if (match_string (HERE_PM_STR, rp))
446 if (!recursive (_NL_CURRENT (LC_TIME, T_FMT_AMPM)))
453 if (*decided == not &&
454 strcmp (_NL_CURRENT (LC_TIME, T_FMT_AMPM),
462 if (!recursive (HERE_T_FMT_AMPM))
466 if (!recursive ("%H:%M"))
471 /* The number of seconds may be very high so we cannot use
472 the `get_number' macro. Instead read the number
473 character for character and construct the result while
476 if (*rp < '0' || *rp > '9')
477 /* We need at least one digit. */
485 while (*rp >= '0' && *rp <= '9');
487 if (localtime_r (&secs, tm) == NULL)
488 /* Error in function. */
500 if (!recursive (_NL_CURRENT (LC_TIME, T_FMT)))
507 if (strcmp (_NL_CURRENT (LC_TIME, T_FMT), HERE_T_FMT))
516 if (!recursive (HERE_T_FMT))
521 tm->tm_wday = val % 7;
525 /* XXX This cannot determine any field in TM. */
528 if (*rp < '0' || *rp > '9')
530 /* XXX Ignore the number since we would need some more
531 information to compute a real date. */
534 while (*rp >= '0' && *rp <= '9');
540 /* XXX This cannot determine any field in TM without some
544 /* Match number of weekday. */
549 /* Match year within century. */
551 /* The "Year 2000 :The Millennium Rollover" paper suggests that
552 values in the range 69-99 refer to the twentieth century. */
553 tm->tm_year = val >= 69 ? val : val + 100;
554 /* Indicate that we want to use the century, if specified
558 /* Match year including century number. */
559 get_number (0, 9999);
560 tm->tm_year = val - 1900;
564 /* XXX How to handle this? */
571 /* Match locale's alternate date and time format. */
574 const char *fmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT);
577 fmt = _NL_CURRENT (LC_TIME, D_T_FMT);
579 if (!recursive (fmt))
586 if (strcmp (fmt, HERE_D_T_FMT))
592 /* The C locale has no era information, so use the
593 normal representation. */
594 if (!recursive (HERE_D_T_FMT))
600 /* Match name of base year in locale's alternate
602 /* XXX This is currently not implemented. It should
603 use the value _NL_CURRENT (LC_TIME, ERA). */
608 const char *fmt = _NL_CURRENT (LC_TIME, ERA_D_FMT);
611 fmt = _NL_CURRENT (LC_TIME, D_FMT);
613 if (!recursive (fmt))
620 if (strcmp (fmt, HERE_D_FMT))
626 if (!recursive (HERE_D_FMT))
632 const char *fmt = _NL_CURRENT (LC_TIME, ERA_T_FMT);
635 fmt = _NL_CURRENT (LC_TIME, T_FMT);
637 if (!recursive (fmt))
644 if (strcmp (fmt, HERE_T_FMT))
650 if (!recursive (HERE_T_FMT))
658 /* We have no information about the era format. Just use
659 the normal format. */
660 if (*fmt != 'c' && *fmt != 'C' && *fmt != 'y' && *fmt != 'Y'
661 && *fmt != 'x' && *fmt != 'X')
662 /* This is an illegal format. */
672 /* Match day of month using alternate numeric symbols. */
673 get_alt_number (1, 31);
677 /* Match hour in 24-hour clock using alternate numeric
679 get_alt_number (0, 23);
684 /* Match hour in 12-hour clock using alternate numeric
686 get_alt_number (1, 12);
687 tm->tm_hour = val - 1;
691 /* Match month using alternate numeric symbols. */
692 get_alt_number (1, 12);
693 tm->tm_mon = val - 1;
696 /* Match minutes using alternate numeric symbols. */
697 get_alt_number (0, 59);
701 /* Match seconds using alternate numeric symbols. */
702 get_alt_number (0, 61);
708 get_alt_number (0, 53);
709 /* XXX This cannot determine any field in TM without
710 further information. */
713 /* Match number of weekday using alternate numeric symbols. */
714 get_alt_number (0, 6);
718 /* Match year within century using alternate numeric symbols. */
719 get_alt_number (0, 99);
720 tm->tm_year = val >= 69 ? val : val + 100;
734 if (want_century && century != -1)
735 tm->tm_year = tm->tm_year % 100 + (century - 19) * 100;
742 strptime (buf, format, tm)
747 enum locale_status decided;
753 return strptime_internal (buf, format, tm, &decided);