8c9be543ce
strftime(3), and allow them to process space-padded input. PR: 230720 Submitted by: rlittle@inetco.com (original version) Approved by: kib (mentor, implicit) Differential Revision: https://reviews.freebsd.org/D17761
725 lines
16 KiB
C
725 lines
16 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2014 Gary Mills
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* Copyright 2011, Nexenta Systems, Inc. All rights reserved.
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* Copyright (c) 1994 Powerdog Industries. All rights reserved.
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*
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* Copyright (c) 2011 The FreeBSD Foundation
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* All rights reserved.
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* Portions of this software were developed by David Chisnall
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY POWERDOG INDUSTRIES ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE POWERDOG INDUSTRIES BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* The views and conclusions contained in the software and documentation
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* are those of the authors and should not be interpreted as representing
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* official policies, either expressed or implied, of Powerdog Industries.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#ifndef NOID
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static char copyright[] __unused =
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"@(#) Copyright (c) 1994 Powerdog Industries. All rights reserved.";
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static char sccsid[] __unused = "@(#)strptime.c 0.1 (Powerdog) 94/03/27";
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#endif /* !defined NOID */
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#endif /* not lint */
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <time.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#include "timelocal.h"
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#include "tzfile.h"
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static char * _strptime(const char *, const char *, struct tm *, int *, locale_t);
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#define asizeof(a) (sizeof(a) / sizeof((a)[0]))
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#define FLAG_NONE (1 << 0)
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#define FLAG_YEAR (1 << 1)
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#define FLAG_MONTH (1 << 2)
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#define FLAG_YDAY (1 << 3)
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#define FLAG_MDAY (1 << 4)
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#define FLAG_WDAY (1 << 5)
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/*
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* Calculate the week day of the first day of a year. Valid for
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* the Gregorian calendar, which began Sept 14, 1752 in the UK
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* and its colonies. Ref:
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* http://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week
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*/
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static int
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first_wday_of(int year)
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{
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return (((2 * (3 - (year / 100) % 4)) + (year % 100) +
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((year % 100) / 4) + (isleap(year) ? 6 : 0) + 1) % 7);
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}
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static char *
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_strptime(const char *buf, const char *fmt, struct tm *tm, int *GMTp,
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locale_t locale)
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{
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char c;
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const char *ptr;
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int day_offset = -1, wday_offset;
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int week_offset;
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int i, len;
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int flags;
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int Ealternative, Oalternative;
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int century, year;
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const struct lc_time_T *tptr = __get_current_time_locale(locale);
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static int start_of_month[2][13] = {
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{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
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{0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
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};
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flags = FLAG_NONE;
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century = -1;
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year = -1;
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ptr = fmt;
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while (*ptr != 0) {
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c = *ptr++;
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if (c != '%') {
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if (isspace_l((unsigned char)c, locale))
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while (*buf != 0 &&
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isspace_l((unsigned char)*buf, locale))
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buf++;
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else if (c != *buf++)
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return (NULL);
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continue;
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}
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Ealternative = 0;
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Oalternative = 0;
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label:
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c = *ptr++;
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switch (c) {
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case '%':
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if (*buf++ != '%')
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return (NULL);
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break;
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case '+':
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buf = _strptime(buf, tptr->date_fmt, tm, GMTp, locale);
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if (buf == NULL)
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return (NULL);
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flags |= FLAG_WDAY | FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
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break;
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case 'C':
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if (!isdigit_l((unsigned char)*buf, locale))
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return (NULL);
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/* XXX This will break for 3-digit centuries. */
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len = 2;
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for (i = 0; len && *buf != 0 &&
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isdigit_l((unsigned char)*buf, locale); buf++) {
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i *= 10;
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i += *buf - '0';
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len--;
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}
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century = i;
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flags |= FLAG_YEAR;
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break;
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case 'c':
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buf = _strptime(buf, tptr->c_fmt, tm, GMTp, locale);
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if (buf == NULL)
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return (NULL);
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flags |= FLAG_WDAY | FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
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break;
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case 'D':
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buf = _strptime(buf, "%m/%d/%y", tm, GMTp, locale);
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if (buf == NULL)
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return (NULL);
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flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
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break;
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case 'E':
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if (Ealternative || Oalternative)
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break;
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Ealternative++;
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goto label;
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case 'O':
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if (Ealternative || Oalternative)
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break;
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Oalternative++;
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goto label;
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case 'F':
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buf = _strptime(buf, "%Y-%m-%d", tm, GMTp, locale);
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if (buf == NULL)
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return (NULL);
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flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
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break;
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case 'R':
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buf = _strptime(buf, "%H:%M", tm, GMTp, locale);
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if (buf == NULL)
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return (NULL);
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break;
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case 'r':
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buf = _strptime(buf, tptr->ampm_fmt, tm, GMTp, locale);
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if (buf == NULL)
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return (NULL);
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break;
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case 'T':
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buf = _strptime(buf, "%H:%M:%S", tm, GMTp, locale);
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if (buf == NULL)
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return (NULL);
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break;
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case 'X':
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buf = _strptime(buf, tptr->X_fmt, tm, GMTp, locale);
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if (buf == NULL)
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return (NULL);
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break;
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case 'x':
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buf = _strptime(buf, tptr->x_fmt, tm, GMTp, locale);
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if (buf == NULL)
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return (NULL);
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flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
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break;
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case 'j':
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if (!isdigit_l((unsigned char)*buf, locale))
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return (NULL);
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len = 3;
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for (i = 0; len && *buf != 0 &&
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isdigit_l((unsigned char)*buf, locale); buf++){
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i *= 10;
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i += *buf - '0';
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len--;
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}
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if (i < 1 || i > 366)
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return (NULL);
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tm->tm_yday = i - 1;
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flags |= FLAG_YDAY;
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break;
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case 'M':
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case 'S':
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if (*buf == 0 ||
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isspace_l((unsigned char)*buf, locale))
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break;
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if (!isdigit_l((unsigned char)*buf, locale))
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return (NULL);
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len = 2;
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for (i = 0; len && *buf != 0 &&
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isdigit_l((unsigned char)*buf, locale); buf++){
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i *= 10;
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i += *buf - '0';
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len--;
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}
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if (c == 'M') {
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if (i > 59)
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return (NULL);
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tm->tm_min = i;
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} else {
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if (i > 60)
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return (NULL);
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tm->tm_sec = i;
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}
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break;
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case 'H':
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case 'I':
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case 'k':
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case 'l':
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/*
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* %k and %l specifiers are documented as being
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* blank-padded. However, there is no harm in
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* allowing zero-padding.
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*
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* XXX %k and %l specifiers may gobble one too many
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* digits if used incorrectly.
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*/
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len = 2;
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if ((c == 'k' || c == 'l') &&
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isblank_l((unsigned char)*buf, locale)) {
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buf++;
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len = 1;
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}
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if (!isdigit_l((unsigned char)*buf, locale))
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return (NULL);
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for (i = 0; len && *buf != 0 &&
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isdigit_l((unsigned char)*buf, locale); buf++) {
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i *= 10;
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i += *buf - '0';
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len--;
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}
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if (c == 'H' || c == 'k') {
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if (i > 23)
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return (NULL);
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} else if (i == 0 || i > 12)
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return (NULL);
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tm->tm_hour = i;
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break;
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case 'p':
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/*
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* XXX This is bogus if parsed before hour-related
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* specifiers.
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*/
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if (tm->tm_hour > 12)
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return (NULL);
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len = strlen(tptr->am);
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if (strncasecmp_l(buf, tptr->am, len, locale) == 0) {
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if (tm->tm_hour == 12)
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tm->tm_hour = 0;
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buf += len;
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break;
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}
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len = strlen(tptr->pm);
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if (strncasecmp_l(buf, tptr->pm, len, locale) == 0) {
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if (tm->tm_hour != 12)
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tm->tm_hour += 12;
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buf += len;
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break;
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}
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return (NULL);
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case 'A':
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case 'a':
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for (i = 0; i < asizeof(tptr->weekday); i++) {
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len = strlen(tptr->weekday[i]);
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if (strncasecmp_l(buf, tptr->weekday[i],
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len, locale) == 0)
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break;
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len = strlen(tptr->wday[i]);
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if (strncasecmp_l(buf, tptr->wday[i],
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len, locale) == 0)
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break;
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}
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if (i == asizeof(tptr->weekday))
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return (NULL);
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buf += len;
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tm->tm_wday = i;
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flags |= FLAG_WDAY;
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break;
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case 'U':
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case 'W':
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/*
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* XXX This is bogus, as we can not assume any valid
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* information present in the tm structure at this
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* point to calculate a real value, so just check the
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* range for now.
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*/
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if (!isdigit_l((unsigned char)*buf, locale))
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return (NULL);
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len = 2;
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for (i = 0; len && *buf != 0 &&
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isdigit_l((unsigned char)*buf, locale); buf++) {
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i *= 10;
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i += *buf - '0';
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len--;
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}
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if (i > 53)
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return (NULL);
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if (c == 'U')
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day_offset = TM_SUNDAY;
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else
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day_offset = TM_MONDAY;
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week_offset = i;
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break;
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case 'u':
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case 'w':
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if (!isdigit_l((unsigned char)*buf, locale))
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return (NULL);
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i = *buf++ - '0';
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if (i < 0 || i > 7 || (c == 'u' && i < 1) ||
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(c == 'w' && i > 6))
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return (NULL);
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tm->tm_wday = i % 7;
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flags |= FLAG_WDAY;
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break;
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case 'e':
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/*
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* With %e format, our strftime(3) adds a blank space
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* before single digits.
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*/
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if (*buf != 0 &&
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isspace_l((unsigned char)*buf, locale))
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buf++;
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/* FALLTHROUGH */
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case 'd':
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/*
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* The %e specifier was once explicitly documented as
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* not being zero-padded but was later changed to
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* equivalent to %d. There is no harm in allowing
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* such padding.
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*
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* XXX The %e specifier may gobble one too many
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* digits if used incorrectly.
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*/
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if (!isdigit_l((unsigned char)*buf, locale))
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return (NULL);
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len = 2;
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for (i = 0; len && *buf != 0 &&
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isdigit_l((unsigned char)*buf, locale); buf++) {
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i *= 10;
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i += *buf - '0';
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len--;
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}
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if (i == 0 || i > 31)
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return (NULL);
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tm->tm_mday = i;
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flags |= FLAG_MDAY;
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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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for (i = 0; i < asizeof(tptr->month); i++) {
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if (Oalternative) {
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if (c == 'B') {
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len = strlen(tptr->alt_month[i]);
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if (strncasecmp_l(buf,
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tptr->alt_month[i],
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len, locale) == 0)
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break;
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}
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} else {
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len = strlen(tptr->month[i]);
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if (strncasecmp_l(buf, tptr->month[i],
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len, locale) == 0)
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break;
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}
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}
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/*
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* Try the abbreviated month name if the full name
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* wasn't found and Oalternative was not requested.
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*/
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if (i == asizeof(tptr->month) && !Oalternative) {
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for (i = 0; i < asizeof(tptr->month); i++) {
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len = strlen(tptr->mon[i]);
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if (strncasecmp_l(buf, tptr->mon[i],
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len, locale) == 0)
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break;
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}
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}
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if (i == asizeof(tptr->month))
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return (NULL);
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tm->tm_mon = i;
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buf += len;
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flags |= FLAG_MONTH;
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break;
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case 'm':
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if (!isdigit_l((unsigned char)*buf, locale))
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return (NULL);
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len = 2;
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for (i = 0; len && *buf != 0 &&
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isdigit_l((unsigned char)*buf, locale); buf++) {
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i *= 10;
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i += *buf - '0';
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len--;
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}
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if (i < 1 || i > 12)
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return (NULL);
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tm->tm_mon = i - 1;
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flags |= FLAG_MONTH;
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break;
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case 's':
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{
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char *cp;
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int sverrno;
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long n;
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time_t t;
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sverrno = errno;
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errno = 0;
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n = strtol_l(buf, &cp, 10, locale);
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if (errno == ERANGE || (long)(t = n) != n) {
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errno = sverrno;
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return (NULL);
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}
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errno = sverrno;
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buf = cp;
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if (gmtime_r(&t, tm) == NULL)
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return (NULL);
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*GMTp = 1;
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flags |= FLAG_YDAY | FLAG_WDAY | FLAG_MONTH |
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FLAG_MDAY | FLAG_YEAR;
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}
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break;
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case 'Y':
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case 'y':
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if (*buf == 0 ||
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isspace_l((unsigned char)*buf, locale))
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break;
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if (!isdigit_l((unsigned char)*buf, locale))
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return (NULL);
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len = (c == 'Y') ? 4 : 2;
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for (i = 0; len && *buf != 0 &&
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isdigit_l((unsigned char)*buf, locale); buf++) {
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i *= 10;
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i += *buf - '0';
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len--;
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}
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if (c == 'Y')
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century = i / 100;
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year = i % 100;
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flags |= FLAG_YEAR;
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break;
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case 'Z':
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{
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const char *cp;
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char *zonestr;
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for (cp = buf; *cp &&
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isupper_l((unsigned char)*cp, locale); ++cp) {
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/*empty*/}
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if (cp - buf) {
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zonestr = alloca(cp - buf + 1);
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strncpy(zonestr, buf, cp - buf);
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zonestr[cp - buf] = '\0';
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tzset();
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if (0 == strcmp(zonestr, "GMT") ||
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0 == strcmp(zonestr, "UTC")) {
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*GMTp = 1;
|
|
} else if (0 == strcmp(zonestr, tzname[0])) {
|
|
tm->tm_isdst = 0;
|
|
} else if (0 == strcmp(zonestr, tzname[1])) {
|
|
tm->tm_isdst = 1;
|
|
} else {
|
|
return (NULL);
|
|
}
|
|
buf += cp - buf;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 'z':
|
|
{
|
|
int sign = 1;
|
|
|
|
if (*buf != '+') {
|
|
if (*buf == '-')
|
|
sign = -1;
|
|
else
|
|
return (NULL);
|
|
}
|
|
|
|
buf++;
|
|
i = 0;
|
|
for (len = 4; len > 0; len--) {
|
|
if (isdigit_l((unsigned char)*buf, locale)) {
|
|
i *= 10;
|
|
i += *buf - '0';
|
|
buf++;
|
|
} else if (len == 2) {
|
|
i *= 100;
|
|
break;
|
|
} else
|
|
return (NULL);
|
|
}
|
|
|
|
if (i > 1400 || (sign == -1 && i > 1200) ||
|
|
(i % 100) >= 60)
|
|
return (NULL);
|
|
tm->tm_hour -= sign * (i / 100);
|
|
tm->tm_min -= sign * (i % 100);
|
|
*GMTp = 1;
|
|
}
|
|
break;
|
|
|
|
case 'n':
|
|
case 't':
|
|
while (isspace_l((unsigned char)*buf, locale))
|
|
buf++;
|
|
break;
|
|
|
|
default:
|
|
return (NULL);
|
|
}
|
|
}
|
|
|
|
if (century != -1 || year != -1) {
|
|
if (year == -1)
|
|
year = 0;
|
|
if (century == -1) {
|
|
if (year < 69)
|
|
year += 100;
|
|
} else
|
|
year += century * 100 - TM_YEAR_BASE;
|
|
tm->tm_year = year;
|
|
}
|
|
|
|
if (!(flags & FLAG_YDAY) && (flags & FLAG_YEAR)) {
|
|
if ((flags & (FLAG_MONTH | FLAG_MDAY)) ==
|
|
(FLAG_MONTH | FLAG_MDAY)) {
|
|
tm->tm_yday = start_of_month[isleap(tm->tm_year +
|
|
TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);
|
|
flags |= FLAG_YDAY;
|
|
} else if (day_offset != -1) {
|
|
int tmpwday, tmpyday, fwo;
|
|
|
|
fwo = first_wday_of(tm->tm_year + TM_YEAR_BASE);
|
|
/* No incomplete week (week 0). */
|
|
if (week_offset == 0 && fwo == day_offset)
|
|
return (NULL);
|
|
|
|
/* Set the date to the first Sunday (or Monday)
|
|
* of the specified week of the year.
|
|
*/
|
|
tmpwday = (flags & FLAG_WDAY) ? tm->tm_wday :
|
|
day_offset;
|
|
tmpyday = (7 - fwo + day_offset) % 7 +
|
|
(week_offset - 1) * 7 +
|
|
(tmpwday - day_offset + 7) % 7;
|
|
/* Impossible yday for incomplete week (week 0). */
|
|
if (tmpyday < 0) {
|
|
if (flags & FLAG_WDAY)
|
|
return (NULL);
|
|
tmpyday = 0;
|
|
}
|
|
tm->tm_yday = tmpyday;
|
|
flags |= FLAG_YDAY;
|
|
}
|
|
}
|
|
|
|
if ((flags & (FLAG_YEAR | FLAG_YDAY)) == (FLAG_YEAR | FLAG_YDAY)) {
|
|
if (!(flags & FLAG_MONTH)) {
|
|
i = 0;
|
|
while (tm->tm_yday >=
|
|
start_of_month[isleap(tm->tm_year +
|
|
TM_YEAR_BASE)][i])
|
|
i++;
|
|
if (i > 12) {
|
|
i = 1;
|
|
tm->tm_yday -=
|
|
start_of_month[isleap(tm->tm_year +
|
|
TM_YEAR_BASE)][12];
|
|
tm->tm_year++;
|
|
}
|
|
tm->tm_mon = i - 1;
|
|
flags |= FLAG_MONTH;
|
|
}
|
|
if (!(flags & FLAG_MDAY)) {
|
|
tm->tm_mday = tm->tm_yday -
|
|
start_of_month[isleap(tm->tm_year + TM_YEAR_BASE)]
|
|
[tm->tm_mon] + 1;
|
|
flags |= FLAG_MDAY;
|
|
}
|
|
if (!(flags & FLAG_WDAY)) {
|
|
i = 0;
|
|
wday_offset = first_wday_of(tm->tm_year);
|
|
while (i++ <= tm->tm_yday) {
|
|
if (wday_offset++ >= 6)
|
|
wday_offset = 0;
|
|
}
|
|
tm->tm_wday = wday_offset;
|
|
flags |= FLAG_WDAY;
|
|
}
|
|
}
|
|
|
|
return ((char *)buf);
|
|
}
|
|
|
|
char *
|
|
strptime_l(const char * __restrict buf, const char * __restrict fmt,
|
|
struct tm * __restrict tm, locale_t loc)
|
|
{
|
|
char *ret;
|
|
int gmt;
|
|
FIX_LOCALE(loc);
|
|
|
|
gmt = 0;
|
|
ret = _strptime(buf, fmt, tm, &gmt, loc);
|
|
if (ret && gmt) {
|
|
time_t t = timegm(tm);
|
|
|
|
localtime_r(&t, tm);
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
char *
|
|
strptime(const char * __restrict buf, const char * __restrict fmt,
|
|
struct tm * __restrict tm)
|
|
{
|
|
return strptime_l(buf, fmt, tm, __get_locale());
|
|
}
|