398592ffe1
Discuss in the BUGS section of the manpage, problems involved with the use of %C, %e, %l, %p, %U and %W. PR: 13901 Reported by: scott@chronis.pobox.com
544 lines
12 KiB
C
544 lines
12 KiB
C
/*
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* Powerdog Industries kindly requests feedback from anyone modifying
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* this function:
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*
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* Date: Thu, 05 Jun 1997 23:17:17 -0400
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* From: Kevin Ruddy <kevin.ruddy@powerdog.com>
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* To: James FitzGibbon <james@nexis.net>
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* Subject: Re: Use of your strptime(3) code (fwd)
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*
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* The reason for the "no mod" clause was so that modifications would
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* come back and we could integrate them and reissue so that a wider
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* audience could use it (thereby spreading the wealth). This has
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* made it possible to get strptime to work on many operating systems.
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* I'm not sure why that's "plain unacceptable" to the FreeBSD team.
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*
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* Anyway, you can change it to "with or without modification" as
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* you see fit. Enjoy.
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*
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* Kevin Ruddy
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* Powerdog Industries, Inc.
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*/
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/*
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* Copyright (c) 1994 Powerdog Industries. All rights reserved.
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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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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgement:
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* This product includes software developed by Powerdog Industries.
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* 4. The name of Powerdog Industries may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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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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#ifdef LIBC_RCS
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static const char rcsid[] =
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"$FreeBSD$";
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#endif
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#ifndef lint
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#ifndef NOID
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static char copyright[] =
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"@(#) Copyright (c) 1994 Powerdog Industries. All rights reserved.";
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static char sccsid[] = "@(#)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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#include <time.h>
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#include <ctype.h>
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#include <string.h>
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#ifdef _THREAD_SAFE
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#include <pthread.h>
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#include "pthread_private.h"
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#endif
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#include "timelocal.h"
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static char * _strptime(const char *, const char *, struct tm *);
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#ifdef _THREAD_SAFE
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static struct pthread_mutex _gotgmt_mutexd = PTHREAD_MUTEX_STATIC_INITIALIZER;
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static pthread_mutex_t gotgmt_mutex = &_gotgmt_mutexd;
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#endif
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static int got_GMT;
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#define asizeof(a) (sizeof (a) / sizeof ((a)[0]))
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static char *
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_strptime(const char *buf, const char *fmt, struct tm *tm)
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{
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char c;
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const char *ptr;
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int i,
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len;
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int Ealternative, Oalternative;
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ptr = fmt;
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while (*ptr != 0) {
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if (*buf == 0)
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break;
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c = *ptr++;
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if (c != '%') {
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if (isspace((unsigned char)c))
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while (*buf != 0 && isspace((unsigned char)*buf))
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buf++;
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else if (c != *buf++)
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return 0;
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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 0:
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case '%':
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if (*buf++ != '%')
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return 0;
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break;
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case '+':
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buf = _strptime(buf, Locale->date_fmt, tm);
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if (buf == 0)
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return 0;
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break;
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case 'C':
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if (!isdigit((unsigned char)*buf))
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return 0;
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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 && isdigit((unsigned char)*buf); 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 < 19)
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return 0;
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tm->tm_year = i * 100 - 1900;
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break;
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case 'c':
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buf = _strptime(buf, Locale->c_fmt, tm);
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if (buf == 0)
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return 0;
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break;
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case 'D':
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buf = _strptime(buf, "%m/%d/%y", tm);
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if (buf == 0)
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return 0;
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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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case 'f':
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if (!Ealternative)
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break;
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buf = _strptime(buf, (c == 'f') ? Locale->Ef_fmt : Locale->EF_fmt, tm);
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if (buf == 0)
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return 0;
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break;
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case 'R':
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buf = _strptime(buf, "%H:%M", tm);
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if (buf == 0)
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return 0;
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break;
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case 'r':
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buf = _strptime(buf, "%I:%M:%S %p", tm);
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if (buf == 0)
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return 0;
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break;
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case 'T':
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buf = _strptime(buf, "%H:%M:%S", tm);
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if (buf == 0)
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return 0;
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break;
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case 'X':
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buf = _strptime(buf, Locale->X_fmt, tm);
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if (buf == 0)
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return 0;
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break;
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case 'x':
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buf = _strptime(buf, Locale->x_fmt, tm);
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if (buf == 0)
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return 0;
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break;
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case 'j':
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if (!isdigit((unsigned char)*buf))
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return 0;
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len = 3;
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for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); 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 0;
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tm->tm_yday = i - 1;
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break;
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case 'M':
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case 'S':
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if (*buf == 0 || isspace((unsigned char)*buf))
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break;
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if (!isdigit((unsigned char)*buf))
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return 0;
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len = 2;
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for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); 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 0;
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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 0;
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tm->tm_sec = i;
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}
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if (*buf != 0 && isspace((unsigned char)*buf))
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while (*ptr != 0 && !isspace((unsigned char)*ptr))
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ptr++;
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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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* Of these, %l is the only specifier explicitly
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* documented as not being zero-padded. However,
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* there is no harm in allowing zero-padding.
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*
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* XXX The %l specifier may gobble one too many
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* digits if used incorrectly.
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*/
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if (!isdigit((unsigned char)*buf))
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return 0;
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len = 2;
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for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); 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 0;
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} else if (i > 12)
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return 0;
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tm->tm_hour = i;
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if (*buf != 0 && isspace((unsigned char)*buf))
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while (*ptr != 0 && !isspace((unsigned char)*ptr))
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ptr++;
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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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len = strlen(Locale->am);
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if (strncasecmp(buf, Locale->am, len) == 0) {
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if (tm->tm_hour > 12)
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return 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(Locale->pm);
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if (strncasecmp(buf, Locale->pm, len) == 0) {
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if (tm->tm_hour > 12)
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return 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 0;
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case 'A':
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case 'a':
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for (i = 0; i < asizeof(Locale->weekday); i++) {
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if (c == 'A') {
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len = strlen(Locale->weekday[i]);
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if (strncasecmp(buf,
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Locale->weekday[i],
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len) == 0)
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break;
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} else {
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len = strlen(Locale->wday[i]);
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if (strncasecmp(buf,
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Locale->wday[i],
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len) == 0)
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break;
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}
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}
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if (i == asizeof(Locale->weekday))
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return 0;
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tm->tm_wday = i;
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buf += len;
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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((unsigned char)*buf))
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return 0;
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len = 2;
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for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); 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 0;
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if (*buf != 0 && isspace((unsigned char)*buf))
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while (*ptr != 0 && !isspace((unsigned char)*ptr))
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ptr++;
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break;
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case 'w':
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if (!isdigit((unsigned char)*buf))
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return 0;
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i = *buf - '0';
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if (i > 6)
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return 0;
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tm->tm_wday = i;
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if (*buf != 0 && isspace((unsigned char)*buf))
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while (*ptr != 0 && !isspace((unsigned char)*ptr))
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ptr++;
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break;
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case 'd':
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case 'e':
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/*
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* The %e specifier is explicitly documented as not
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* being zero-padded but 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((unsigned char)*buf))
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return 0;
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len = 2;
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for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); 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 > 31)
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return 0;
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tm->tm_mday = i;
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if (*buf != 0 && isspace((unsigned char)*buf))
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while (*ptr != 0 && !isspace((unsigned char)*ptr))
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ptr++;
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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(Locale->month); i++) {
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if (Oalternative) {
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if (c == 'B') {
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len = strlen(Locale->alt_month[i]);
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if (strncasecmp(buf,
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Locale->alt_month[i],
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len) == 0)
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break;
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}
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} else {
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if (c == 'B') {
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len = strlen(Locale->month[i]);
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if (strncasecmp(buf,
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Locale->month[i],
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len) == 0)
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break;
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} else {
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len = strlen(Locale->mon[i]);
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if (strncasecmp(buf,
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Locale->mon[i],
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len) == 0)
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break;
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}
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}
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}
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if (i == asizeof(Locale->month))
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return 0;
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tm->tm_mon = i;
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buf += len;
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break;
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case 'm':
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if (!isdigit((unsigned char)*buf))
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return 0;
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len = 2;
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for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); 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 0;
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tm->tm_mon = i - 1;
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if (*buf != 0 && isspace((unsigned char)*buf))
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while (*ptr != 0 && !isspace((unsigned char)*ptr))
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ptr++;
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break;
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case 'Y':
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case 'y':
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if (*buf == 0 || isspace((unsigned char)*buf))
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break;
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if (!isdigit((unsigned char)*buf))
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return 0;
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len = (c == 'Y') ? 4 : 2;
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for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); 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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i -= 1900;
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if (c == 'y' && i < 69)
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i += 100;
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if (i < 0)
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return 0;
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tm->tm_year = i;
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if (*buf != 0 && isspace((unsigned char)*buf))
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while (*ptr != 0 && !isspace((unsigned char)*ptr))
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ptr++;
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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 && isupper((unsigned char)*cp); ++cp) {/*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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got_GMT = 1;
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} else if (0 == strcmp(zonestr, tzname[0])) {
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tm->tm_isdst = 0;
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} else if (0 == strcmp(zonestr, tzname[1])) {
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tm->tm_isdst = 1;
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} else {
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return 0;
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}
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buf += cp - buf;
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}
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}
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break;
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}
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}
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return (char *)buf;
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}
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char *
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strptime(const char *buf, const char *fmt, struct tm *tm)
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{
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char *ret;
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#ifdef _THREAD_SAFE
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pthread_mutex_lock(&gotgmt_mutex);
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#endif
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got_GMT = 0;
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ret = _strptime(buf, fmt, tm);
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if (ret && got_GMT) {
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time_t t = timegm(tm);
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localtime_r(&t, tm);
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got_GMT = 0;
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}
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#ifdef _THREAD_SAFE
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pthread_mutex_unlock(&gotgmt_mutex);
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#endif
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return ret;
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}
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