744 lines
18 KiB
C
744 lines
18 KiB
C
/* Convert a string representation of time to a time value.
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Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* XXX This version of the implementation is not really complete.
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Some of the fields cannot add information alone. But if seeing
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some of them in the same format (such as year, week and weekday)
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this is enough information for determining the date. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <ctype.h>
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#include <langinfo.h>
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#include <limits.h>
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#include <string.h>
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#include <time.h>
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#ifdef _LIBC
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# include "../locale/localeinfo.h"
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#endif
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#ifndef __P
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# if defined (__GNUC__) || (defined (__STDC__) && __STDC__)
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# define __P(args) args
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# else
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# define __P(args) ()
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# endif /* GCC. */
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#endif /* Not __P. */
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#if ! HAVE_LOCALTIME_R && ! defined (localtime_r)
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#ifdef _LIBC
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#define localtime_r __localtime_r
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#else
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/* Approximate localtime_r as best we can in its absence. */
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#define localtime_r my_localtime_r
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static struct tm *localtime_r __P ((const time_t *, struct tm *));
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static struct tm *
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localtime_r (t, tp)
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const time_t *t;
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struct tm *tp;
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{
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struct tm *l = localtime (t);
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if (! l)
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return 0;
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*tp = *l;
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return tp;
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}
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#endif /* ! _LIBC */
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#endif /* ! HAVE_LOCALTIME_R && ! defined (localtime_r) */
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#define match_char(ch1, ch2) if (ch1 != ch2) return NULL
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#if defined __GNUC__ && __GNUC__ >= 2
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# define match_string(cs1, s2) \
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({ size_t len = strlen (cs1); \
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int result = strncasecmp ((cs1), (s2), len) == 0; \
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if (result) (s2) += len; \
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result; })
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#else
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/* Oh come on. Get a reasonable compiler. */
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# define match_string(cs1, s2) \
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(strncasecmp ((cs1), (s2), strlen (cs1)) ? 0 : ((s2) += strlen (cs1), 1))
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#endif
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/* We intentionally do not use isdigit() for testing because this will
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lead to problems with the wide character version. */
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#define get_number(from, to) \
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do { \
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val = 0; \
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if (*rp < '0' || *rp > '9') \
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return NULL; \
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do { \
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val *= 10; \
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val += *rp++ - '0'; \
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} while (val * 10 <= to && *rp >= '0' && *rp <= '9'); \
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if (val < from || val > to) \
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return NULL; \
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} while (0)
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#ifdef _NL_CURRENT
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# define get_alt_number(from, to) \
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do { \
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if (*decided != raw) \
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{ \
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const char *alts = _NL_CURRENT (LC_TIME, ALT_DIGITS); \
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val = 0; \
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while (*alts != '\0') \
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{ \
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size_t len = strlen (alts); \
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if (strncasecmp (alts, rp, len) == 0) \
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break; \
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alts = strchr (alts, '\0') + 1; \
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++val; \
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} \
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if (*alts == '\0') \
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{ \
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if (*decided == loc && val != 0) \
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return NULL; \
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} \
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else \
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{ \
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*decided = loc; \
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break; \
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} \
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} \
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get_number (from, to); \
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} while (0)
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#else
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# define get_alt_number(from, to) \
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/* We don't have the alternate representation. */ \
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get_number(from, to)
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#endif
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#define recursive(new_fmt) \
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(*(new_fmt) != '\0' \
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&& (rp = strptime_internal (rp, (new_fmt), tm, decided)) != NULL)
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#ifdef _LIBC
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/* This is defined in locale/C-time.c in the GNU libc. */
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extern const struct locale_data _nl_C_LC_TIME;
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# define weekday_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (DAY_1)].string)
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# define ab_weekday_name \
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(&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)].string)
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# define month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (MON_1)].string)
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# define ab_month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)].string)
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# define HERE_D_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_T_FMT)].string)
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# define HERE_D_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_T_FMT)].string)
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# define HERE_AM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (AM_STR)].string)
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# define HERE_PM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (PM_STR)].string)
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# define HERE_T_FMT_AMPM \
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(_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT_AMPM)].string)
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# define HERE_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT)].string)
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#else
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static char const weekday_name[][10] =
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{
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"Sunday", "Monday", "Tuesday", "Wednesday",
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"Thursday", "Friday", "Saturday"
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};
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static char const ab_weekday_name[][4] =
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{
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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static char const month_name[][10] =
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{
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"January", "February", "March", "April", "May", "June",
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"July", "August", "September", "October", "November", "December"
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};
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static char const ab_month_name[][4] =
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{
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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# define HERE_D_T_FMT "%a %b %e %H:%M:%S %Y"
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# define HERE_D_FMT "%m/%d/%y"
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# define HERE_AM_STR "AM"
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# define HERE_PM_STR "PM"
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# define HERE_T_FMT_AMPM "%I:%M:%S %p"
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# define HERE_T_FMT "%H:%M:%S"
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#endif
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/* Status of lookup: do we use the locale data or the raw data? */
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enum locale_status { not, loc, raw };
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static char *
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#ifdef _LIBC
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internal_function
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#endif
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strptime_internal __P ((const char *buf, const char *format, struct tm *tm,
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enum locale_status *decided));
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static char *
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#ifdef _LIBC
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internal_function
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#endif
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strptime_internal (buf, format, tm, decided)
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const char *buf;
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const char *format;
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struct tm *tm;
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enum locale_status *decided;
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{
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const char *rp;
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const char *fmt;
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int cnt;
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size_t val;
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int have_I, is_pm;
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rp = buf;
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fmt = format;
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have_I = is_pm = 0;
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while (*fmt != '\0')
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{
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/* A white space in the format string matches 0 more or white
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space in the input string. */
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if (isspace (*fmt))
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{
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while (isspace (*rp))
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++rp;
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++fmt;
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continue;
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}
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/* Any character but `%' must be matched by the same character
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in the iput string. */
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if (*fmt != '%')
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{
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match_char (*fmt++, *rp++);
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continue;
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}
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++fmt;
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#ifndef _NL_CURRENT
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/* We need this for handling the `E' modifier. */
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start_over:
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#endif
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switch (*fmt++)
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{
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case '%':
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/* Match the `%' character itself. */
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match_char ('%', *rp++);
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break;
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case 'a':
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case 'A':
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/* Match day of week. */
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for (cnt = 0; cnt < 7; ++cnt)
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{
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#ifdef _NL_CURRENT
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if (*decided !=raw)
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{
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if (match_string (_NL_CURRENT (LC_TIME, DAY_1 + cnt), rp))
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{
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if (*decided == not
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&& strcmp (_NL_CURRENT (LC_TIME, DAY_1 + cnt),
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weekday_name[cnt]))
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*decided = loc;
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break;
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}
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if (match_string (_NL_CURRENT (LC_TIME, ABDAY_1 + cnt), rp))
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{
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if (*decided == not
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&& strcmp (_NL_CURRENT (LC_TIME, ABDAY_1 + cnt),
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ab_weekday_name[cnt]))
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*decided = loc;
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break;
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}
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}
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#endif
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if (*decided != loc
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&& (match_string (weekday_name[cnt], rp)
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|| match_string (ab_weekday_name[cnt], rp)))
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{
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*decided = raw;
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break;
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}
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}
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if (cnt == 7)
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/* Does not match a weekday name. */
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return NULL;
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tm->tm_wday = cnt;
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break;
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case 'b':
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case 'B':
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case 'h':
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/* Match month name. */
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for (cnt = 0; cnt < 12; ++cnt)
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{
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#ifdef _NL_CURRENT
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if (*decided !=raw)
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{
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if (match_string (_NL_CURRENT (LC_TIME, MON_1 + cnt), rp))
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{
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if (*decided == not
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&& strcmp (_NL_CURRENT (LC_TIME, MON_1 + cnt),
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month_name[cnt]))
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*decided = loc;
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break;
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}
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if (match_string (_NL_CURRENT (LC_TIME, ABMON_1 + cnt), rp))
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{
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if (*decided == not
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&& strcmp (_NL_CURRENT (LC_TIME, ABMON_1 + cnt),
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ab_month_name[cnt]))
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*decided = loc;
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break;
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}
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}
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#endif
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if (match_string (month_name[cnt], rp)
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|| match_string (ab_month_name[cnt], rp))
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{
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*decided = raw;
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break;
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}
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}
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if (cnt == 12)
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/* Does not match a month name. */
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return NULL;
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tm->tm_mon = cnt;
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break;
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case 'c':
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/* Match locale's date and time format. */
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#ifdef _NL_CURRENT
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if (*decided != raw)
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{
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if (!recursive (_NL_CURRENT (LC_TIME, D_T_FMT)))
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{
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if (*decided == loc)
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return NULL;
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}
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else
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{
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if (*decided == not &&
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strcmp (_NL_CURRENT (LC_TIME, D_T_FMT), HERE_D_T_FMT))
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*decided = loc;
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break;
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}
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*decided = raw;
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}
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#endif
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if (!recursive (HERE_D_T_FMT))
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return NULL;
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break;
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case 'C':
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/* Match century number. */
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get_number (0, 99);
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/* We don't need the number. */
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break;
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case 'd':
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case 'e':
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/* Match day of month. */
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get_number (1, 31);
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tm->tm_mday = val;
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break;
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case 'x':
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#ifdef _NL_CURRENT
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if (*decided != raw)
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{
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if (!recursive (_NL_CURRENT (LC_TIME, D_FMT)))
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{
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if (*decided == loc)
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return NULL;
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}
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else
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{
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if (decided == not
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&& strcmp (_NL_CURRENT (LC_TIME, D_FMT), HERE_D_FMT))
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*decided = loc;
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break;
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}
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*decided = raw;
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}
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#endif
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/* Fall through. */
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case 'D':
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/* Match standard day format. */
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if (!recursive (HERE_D_FMT))
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return NULL;
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break;
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case 'H':
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/* Match hour in 24-hour clock. */
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get_number (0, 23);
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tm->tm_hour = val;
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have_I = 0;
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break;
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case 'I':
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/* Match hour in 12-hour clock. */
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get_number (1, 12);
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tm->tm_hour = val % 12;
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have_I = 1;
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break;
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case 'j':
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/* Match day number of year. */
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get_number (1, 366);
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tm->tm_yday = val - 1;
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break;
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case 'm':
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/* Match number of month. */
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get_number (1, 12);
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tm->tm_mon = val - 1;
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break;
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case 'M':
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/* Match minute. */
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get_number (0, 59);
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tm->tm_min = val;
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break;
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case 'n':
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case 't':
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/* Match any white space. */
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while (isspace (*rp))
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++rp;
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break;
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case 'p':
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/* Match locale's equivalent of AM/PM. */
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#ifdef _NL_CURRENT
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if (*decided != raw)
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{
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if (match_string (_NL_CURRENT (LC_TIME, AM_STR), rp))
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{
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if (strcmp (_NL_CURRENT (LC_TIME, AM_STR), HERE_AM_STR))
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*decided = loc;
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break;
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}
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if (match_string (_NL_CURRENT (LC_TIME, PM_STR), rp))
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{
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if (strcmp (_NL_CURRENT (LC_TIME, PM_STR), HERE_PM_STR))
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*decided = loc;
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is_pm = 1;
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break;
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}
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*decided = raw;
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}
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#endif
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if (!match_string (HERE_AM_STR, rp))
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if (match_string (HERE_PM_STR, rp))
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is_pm = 1;
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else
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return NULL;
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break;
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case 'r':
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#ifdef _NL_CURRENT
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if (*decided != raw)
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{
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if (!recursive (_NL_CURRENT (LC_TIME, T_FMT_AMPM)))
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{
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if (*decided == loc)
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return NULL;
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}
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else
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{
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if (*decided == not &&
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strcmp (_NL_CURRENT (LC_TIME, T_FMT_AMPM),
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HERE_T_FMT_AMPM))
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*decided = loc;
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break;
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}
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*decided = raw;
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}
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#endif
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if (!recursive (HERE_T_FMT_AMPM))
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return NULL;
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break;
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case 'R':
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if (!recursive ("%H:%M"))
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return NULL;
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break;
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case 's':
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{
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/* The number of seconds may be very high so we cannot use
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the `get_number' macro. Instead read the number
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character for character and construct the result while
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doing this. */
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time_t secs;
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if (*rp < '0' || *rp > '9')
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/* We need at least one digit. */
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return NULL;
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do
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{
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secs *= 10;
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secs += *rp++ - '0';
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}
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while (*rp >= '0' && *rp <= '9');
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if (localtime_r (&secs, tm) == NULL)
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/* Error in function. */
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return NULL;
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}
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break;
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case 'S':
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get_number (0, 61);
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tm->tm_sec = val;
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break;
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case 'X':
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#ifdef _NL_CURRENT
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if (*decided != raw)
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{
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if (!recursive (_NL_CURRENT (LC_TIME, T_FMT)))
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{
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if (*decided == loc)
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return NULL;
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}
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else
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{
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if (strcmp (_NL_CURRENT (LC_TIME, T_FMT), HERE_T_FMT))
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*decided = loc;
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break;
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}
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*decided = raw;
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}
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#endif
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/* Fall through. */
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case 'T':
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if (!recursive (HERE_T_FMT))
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return NULL;
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break;
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case 'u':
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get_number (1, 7);
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tm->tm_wday = val % 7;
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break;
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case 'g':
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get_number (0, 99);
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/* XXX This cannot determine any field in TM. */
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break;
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case 'G':
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if (*rp < '0' || *rp > '9')
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return NULL;
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/* XXX Ignore the number since we would need some more
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information to compute a real date. */
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do
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++rp;
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while (*rp >= '0' && *rp <= '9');
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break;
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case 'U':
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case 'V':
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case 'W':
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get_number (0, 53);
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/* XXX This cannot determine any field in TM without some
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information. */
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break;
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case 'w':
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/* Match number of weekday. */
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get_number (0, 6);
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tm->tm_wday = val;
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break;
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case 'y':
|
|
/* Match year within century. */
|
|
get_number (0, 99);
|
|
/* The "Year 2000 :The Millennium Rollover" paper suggests that
|
|
values in the range 69-99 refer to the twentieth century. */
|
|
tm->tm_year = val >= 69 ? val : val + 100;
|
|
break;
|
|
case 'Y':
|
|
/* Match year including century number. */
|
|
get_number (0, 9999);
|
|
tm->tm_year = val - 1900;
|
|
break;
|
|
case 'Z':
|
|
/* XXX How to handle this? */
|
|
break;
|
|
case 'E':
|
|
#ifdef _NL_CURRENT
|
|
switch (*fmt++)
|
|
{
|
|
case 'c':
|
|
/* Match locale's alternate date and time format. */
|
|
if (*decided != raw)
|
|
{
|
|
const char *fmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT);
|
|
|
|
if (*fmt == '\0')
|
|
fmt = _NL_CURRENT (LC_TIME, D_T_FMT);
|
|
|
|
if (!recursive (fmt))
|
|
{
|
|
if (*decided == loc)
|
|
return NULL;
|
|
}
|
|
else
|
|
{
|
|
if (strcmp (fmt, HERE_D_T_FMT))
|
|
*decided = loc;
|
|
break;
|
|
}
|
|
*decided = raw;
|
|
}
|
|
/* The C locale has no era information, so use the
|
|
normal representation. */
|
|
if (!recursive (HERE_D_T_FMT))
|
|
return NULL;
|
|
break;
|
|
case 'C':
|
|
case 'y':
|
|
case 'Y':
|
|
/* Match name of base year in locale's alternate
|
|
representation. */
|
|
/* XXX This is currently not implemented. It should
|
|
use the value _NL_CURRENT (LC_TIME, ERA). */
|
|
break;
|
|
case 'x':
|
|
if (*decided != raw)
|
|
{
|
|
const char *fmt = _NL_CURRENT (LC_TIME, ERA_D_FMT);
|
|
|
|
if (*fmt == '\0')
|
|
fmt = _NL_CURRENT (LC_TIME, D_FMT);
|
|
|
|
if (!recursive (fmt))
|
|
{
|
|
if (*decided == loc)
|
|
return NULL;
|
|
}
|
|
else
|
|
{
|
|
if (strcmp (fmt, HERE_D_FMT))
|
|
*decided = loc;
|
|
break;
|
|
}
|
|
*decided = raw;
|
|
}
|
|
if (!recursive (HERE_D_FMT))
|
|
return NULL;
|
|
break;
|
|
case 'X':
|
|
if (*decided != raw)
|
|
{
|
|
const char *fmt = _NL_CURRENT (LC_TIME, ERA_T_FMT);
|
|
|
|
if (*fmt == '\0')
|
|
fmt = _NL_CURRENT (LC_TIME, T_FMT);
|
|
|
|
if (!recursive (fmt))
|
|
{
|
|
if (*decided == loc)
|
|
return NULL;
|
|
}
|
|
else
|
|
{
|
|
if (strcmp (fmt, HERE_T_FMT))
|
|
*decided = loc;
|
|
break;
|
|
}
|
|
*decided = raw;
|
|
}
|
|
if (!recursive (HERE_T_FMT))
|
|
return NULL;
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
break;
|
|
#else
|
|
/* We have no information about the era format. Just use
|
|
the normal format. */
|
|
if (*fmt != 'c' && *fmt != 'C' && *fmt != 'y' && *fmt != 'Y'
|
|
&& *fmt != 'x' && *fmt != 'X')
|
|
/* This is an illegal format. */
|
|
return NULL;
|
|
|
|
goto start_over;
|
|
#endif
|
|
case 'O':
|
|
switch (*fmt++)
|
|
{
|
|
case 'd':
|
|
case 'e':
|
|
/* Match day of month using alternate numeric symbols. */
|
|
get_alt_number (1, 31);
|
|
tm->tm_mday = val;
|
|
break;
|
|
case 'H':
|
|
/* Match hour in 24-hour clock using alternate numeric
|
|
symbols. */
|
|
get_alt_number (0, 23);
|
|
tm->tm_hour = val;
|
|
have_I = 0;
|
|
break;
|
|
case 'I':
|
|
/* Match hour in 12-hour clock using alternate numeric
|
|
symbols. */
|
|
get_alt_number (1, 12);
|
|
tm->tm_hour = val - 1;
|
|
have_I = 1;
|
|
break;
|
|
case 'm':
|
|
/* Match month using alternate numeric symbols. */
|
|
get_alt_number (1, 12);
|
|
tm->tm_mon = val - 1;
|
|
break;
|
|
case 'M':
|
|
/* Match minutes using alternate numeric symbols. */
|
|
get_alt_number (0, 59);
|
|
tm->tm_min = val;
|
|
break;
|
|
case 'S':
|
|
/* Match seconds using alternate numeric symbols. */
|
|
get_alt_number (0, 61);
|
|
tm->tm_sec = val;
|
|
break;
|
|
case 'U':
|
|
case 'V':
|
|
case 'W':
|
|
get_alt_number (0, 53);
|
|
/* XXX This cannot determine any field in TM without
|
|
further information. */
|
|
break;
|
|
case 'w':
|
|
/* Match number of weekday using alternate numeric symbols. */
|
|
get_alt_number (0, 6);
|
|
tm->tm_wday = val;
|
|
break;
|
|
case 'y':
|
|
/* Match year within century using alternate numeric symbols. */
|
|
get_alt_number (0, 99);
|
|
tm->tm_year = val >= 69 ? val : val + 100;
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (have_I && is_pm)
|
|
tm->tm_hour += 12;
|
|
|
|
return (char *) rp;
|
|
}
|
|
|
|
|
|
char *
|
|
strptime (buf, format, tm)
|
|
const char *buf;
|
|
const char *format;
|
|
struct tm *tm;
|
|
{
|
|
enum locale_status decided;
|
|
#ifdef _NL_CURRENT
|
|
decided = not;
|
|
#else
|
|
decided = raw;
|
|
#endif
|
|
return strptime_internal (buf, format, tm, &decided);
|
|
}
|