385 lines
9.5 KiB
C
385 lines
9.5 KiB
C
/* strptime - Convert a string representation of time to a time value.
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Copyright (C) 1996 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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#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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#include "../locale/localeinfo.h"
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#define match_char(ch1, ch2) if (ch1 != ch2) return NULL
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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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/* 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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#define get_alt_number(from, to) \
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do { \
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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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return NULL; \
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} while (0)
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#define recursive(new_fmt) \
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do { \
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if (*new_fmt == '\0') \
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return NULL; \
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rp = strptime (rp, new_fmt, tm); \
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if (rp == NULL) \
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return NULL; \
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} while (0)
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char *
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strptime (const char *buf, const char *format, struct tm *tm)
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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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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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if (match_string (_NL_CURRENT (LC_TIME, ABDAY_1 + cnt), rp))
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break;
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if (match_string (_NL_CURRENT (LC_TIME, DAY_1 + cnt), rp))
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break;
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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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if (match_string (_NL_CURRENT (LC_TIME, ABMON_1 + cnt), rp))
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break;
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if (match_string (_NL_CURRENT (LC_TIME, MON_1 + cnt), rp))
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break;
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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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recursive (_NL_CURRENT (LC_TIME, D_T_FMT));
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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 'D':
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/* Match standard day format. */
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recursive ("%m/%d/%y");
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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 - 1;
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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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if (match_string (_NL_CURRENT (LC_TIME, AM_STR), rp))
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break;
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if (match_string (_NL_CURRENT (LC_TIME, PM_STR), rp))
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{
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is_pm = 1;
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break;
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}
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return NULL;
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case 'r':
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recursive (_NL_CURRENT (LC_TIME, T_FMT_AMPM));
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break;
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case 'R':
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recursive ("%H:%M");
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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 'T':
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recursive ("%H:%M:%S");
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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. */
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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 'x':
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recursive (_NL_CURRENT (LC_TIME, D_FMT));
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break;
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case 'X':
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recursive (_NL_CURRENT (LC_TIME, T_FMT));
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break;
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case 'y':
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/* Match year within century. */
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get_number (0, 99);
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tm->tm_year = val;
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break;
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case 'Y':
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/* Match year including century number. */
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get_number (0, INT_MAX);
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tm->tm_year = val - (val >= 2000 ? 2000 : 1900);
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break;
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case 'Z':
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/* XXX How to handle this? */
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break;
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case 'E':
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switch (*fmt++)
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{
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case 'c':
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/* Match locale's alternate date and time format. */
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recursive (_NL_CURRENT (LC_TIME, ERA_D_T_FMT));
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break;
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case 'C':
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case 'y':
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case 'Y':
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/* Match name of base year in locale's alternate
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representation. */
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/* XXX This is currently not implemented. It should
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use the value _NL_CURRENT (LC_TIME, ERA) but POSIX
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leaves this implementation defined and we haven't
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figured out how to do it yet. */
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break;
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case 'x':
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recursive (_NL_CURRENT (LC_TIME, ERA_D_FMT));
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break;
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case 'X':
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recursive (_NL_CURRENT (LC_TIME, ERA_T_FMT));
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break;
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default:
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return NULL;
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}
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break;
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case 'O':
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switch (*fmt++)
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{
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case 'd':
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case 'e':
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/* Match day of month using alternate numeric symbols. */
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get_alt_number (1, 31);
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tm->tm_mday = val;
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break;
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case 'H':
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/* Match hour in 24-hour clock using alternate numeric
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symbols. */
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get_alt_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 using alternate numeric
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symbols. */
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get_alt_number (1, 12);
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tm->tm_hour = val - 1;
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have_I = 1;
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break;
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case 'm':
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/* Match month using alternate numeric symbols. */
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get_alt_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 minutes using alternate numeric symbols. */
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get_alt_number (0, 59);
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tm->tm_min = val;
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break;
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case 'S':
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/* Match seconds using alternate numeric symbols. */
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get_alt_number (0, 61);
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tm->tm_sec = val;
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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_alt_number (0, 53);
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/* XXX This cannot determine any field in TM. */
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break;
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case 'w':
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/* Match number of weekday using alternate numeric symbols. */
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get_alt_number (0, 6);
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tm->tm_wday = val;
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break;
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case 'y':
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/* Match year within century using alternate numeric symbols. */
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get_alt_number (0, 99);
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break;
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default:
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return NULL;
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}
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break;
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default:
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return NULL;
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}
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}
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if (have_I && is_pm)
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tm->tm_hour += 12;
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return (char *) rp;
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}
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