original netbsd strptime
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Ben Gras
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81399e75ad
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c7050eea55
382
lib/libc/stdtime/strptime.c
Normal file
382
lib/libc/stdtime/strptime.c
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@ -0,0 +1,382 @@
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/* $NetBSD: strptime.c,v 1.28 2008/04/28 20:23:01 martin Exp $ */
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/*-
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* Copyright (c) 1997, 1998, 2005, 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code was contributed to The NetBSD Foundation by Klaus Klein.
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* Heavily optimised by David Laight
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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 in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE 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 BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: strptime.c,v 1.28 2008/04/28 20:23:01 martin Exp $");
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#endif
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#include "namespace.h"
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#include <sys/localedef.h>
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#include <ctype.h>
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#include <locale.h>
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#include <string.h>
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#include <time.h>
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#include <tzfile.h>
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#ifdef __weak_alias
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__weak_alias(strptime,_strptime)
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#endif
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#define _ctloc(x) (_CurrentTimeLocale->x)
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/*
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* We do not implement alternate representations. However, we always
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* check whether a given modifier is allowed for a certain conversion.
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*/
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#define ALT_E 0x01
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#define ALT_O 0x02
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#define LEGAL_ALT(x) { if (alt_format & ~(x)) return NULL; }
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static const char gmt[4] = { "GMT" };
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static const u_char *conv_num(const unsigned char *, int *, uint, uint);
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static const u_char *find_string(const u_char *, int *, const char * const *,
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const char * const *, int);
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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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unsigned char c;
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const unsigned char *bp;
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int alt_format, i, split_year = 0;
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const char *new_fmt;
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bp = (const u_char *)buf;
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while (bp != NULL && (c = *fmt++) != '\0') {
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/* Clear `alternate' modifier prior to new conversion. */
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alt_format = 0;
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i = 0;
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/* Eat up white-space. */
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if (isspace(c)) {
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while (isspace(*bp))
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bp++;
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continue;
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}
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if (c != '%')
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goto literal;
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again: switch (c = *fmt++) {
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case '%': /* "%%" is converted to "%". */
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literal:
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if (c != *bp++)
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return NULL;
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LEGAL_ALT(0);
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continue;
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/*
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* "Alternative" modifiers. Just set the appropriate flag
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* and start over again.
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*/
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case 'E': /* "%E?" alternative conversion modifier. */
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LEGAL_ALT(0);
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alt_format |= ALT_E;
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goto again;
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case 'O': /* "%O?" alternative conversion modifier. */
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LEGAL_ALT(0);
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alt_format |= ALT_O;
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goto again;
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/*
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* "Complex" conversion rules, implemented through recursion.
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*/
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case 'c': /* Date and time, using the locale's format. */
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new_fmt = _ctloc(d_t_fmt);
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goto recurse;
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case 'D': /* The date as "%m/%d/%y". */
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new_fmt = "%m/%d/%y";
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LEGAL_ALT(0);
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goto recurse;
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case 'F': /* The date as "%Y-%m-%d". */
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new_fmt = "%Y-%m-%d";
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LEGAL_ALT(0);
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goto recurse;
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case 'R': /* The time as "%H:%M". */
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new_fmt = "%H:%M";
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LEGAL_ALT(0);
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goto recurse;
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case 'r': /* The time in 12-hour clock representation. */
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new_fmt =_ctloc(t_fmt_ampm);
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LEGAL_ALT(0);
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goto recurse;
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case 'T': /* The time as "%H:%M:%S". */
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new_fmt = "%H:%M:%S";
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LEGAL_ALT(0);
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goto recurse;
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case 'X': /* The time, using the locale's format. */
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new_fmt =_ctloc(t_fmt);
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goto recurse;
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case 'x': /* The date, using the locale's format. */
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new_fmt =_ctloc(d_fmt);
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recurse:
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bp = (const u_char *)strptime((const char *)bp,
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new_fmt, tm);
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LEGAL_ALT(ALT_E);
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continue;
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/*
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* "Elementary" conversion rules.
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*/
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case 'A': /* The day of week, using the locale's form. */
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case 'a':
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bp = find_string(bp, &tm->tm_wday, _ctloc(day),
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_ctloc(abday), 7);
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LEGAL_ALT(0);
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continue;
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case 'B': /* The month, using the locale's form. */
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case 'b':
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case 'h':
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bp = find_string(bp, &tm->tm_mon, _ctloc(mon),
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_ctloc(abmon), 12);
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LEGAL_ALT(0);
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continue;
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case 'C': /* The century number. */
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i = 20;
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bp = conv_num(bp, &i, 0, 99);
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i = i * 100 - TM_YEAR_BASE;
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if (split_year)
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i += tm->tm_year % 100;
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split_year = 1;
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tm->tm_year = i;
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LEGAL_ALT(ALT_E);
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continue;
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case 'd': /* The day of month. */
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case 'e':
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bp = conv_num(bp, &tm->tm_mday, 1, 31);
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LEGAL_ALT(ALT_O);
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continue;
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case 'k': /* The hour (24-hour clock representation). */
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LEGAL_ALT(0);
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/* FALLTHROUGH */
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case 'H':
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bp = conv_num(bp, &tm->tm_hour, 0, 23);
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LEGAL_ALT(ALT_O);
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continue;
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case 'l': /* The hour (12-hour clock representation). */
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LEGAL_ALT(0);
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/* FALLTHROUGH */
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case 'I':
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bp = conv_num(bp, &tm->tm_hour, 1, 12);
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if (tm->tm_hour == 12)
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tm->tm_hour = 0;
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LEGAL_ALT(ALT_O);
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continue;
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case 'j': /* The day of year. */
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i = 1;
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bp = conv_num(bp, &i, 1, 366);
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tm->tm_yday = i - 1;
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LEGAL_ALT(0);
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continue;
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case 'M': /* The minute. */
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bp = conv_num(bp, &tm->tm_min, 0, 59);
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LEGAL_ALT(ALT_O);
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continue;
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case 'm': /* The month. */
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i = 1;
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bp = conv_num(bp, &i, 1, 12);
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tm->tm_mon = i - 1;
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LEGAL_ALT(ALT_O);
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continue;
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case 'p': /* The locale's equivalent of AM/PM. */
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bp = find_string(bp, &i, _ctloc(am_pm), NULL, 2);
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if (tm->tm_hour > 11)
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return NULL;
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tm->tm_hour += i * 12;
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LEGAL_ALT(0);
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continue;
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case 'S': /* The seconds. */
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bp = conv_num(bp, &tm->tm_sec, 0, 61);
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LEGAL_ALT(ALT_O);
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continue;
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case 'U': /* The week of year, beginning on sunday. */
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case 'W': /* The week of year, beginning on monday. */
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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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bp = conv_num(bp, &i, 0, 53);
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LEGAL_ALT(ALT_O);
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continue;
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case 'w': /* The day of week, beginning on sunday. */
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bp = conv_num(bp, &tm->tm_wday, 0, 6);
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LEGAL_ALT(ALT_O);
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continue;
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case 'Y': /* The year. */
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i = TM_YEAR_BASE; /* just for data sanity... */
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bp = conv_num(bp, &i, 0, 9999);
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tm->tm_year = i - TM_YEAR_BASE;
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LEGAL_ALT(ALT_E);
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continue;
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case 'y': /* The year within 100 years of the epoch. */
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/* LEGAL_ALT(ALT_E | ALT_O); */
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bp = conv_num(bp, &i, 0, 99);
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if (split_year)
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/* preserve century */
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i += (tm->tm_year / 100) * 100;
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else {
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split_year = 1;
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if (i <= 68)
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i = i + 2000 - TM_YEAR_BASE;
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else
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i = i + 1900 - TM_YEAR_BASE;
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}
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tm->tm_year = i;
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continue;
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case 'Z':
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tzset();
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if (strncmp((const char *)bp, gmt, 3) == 0) {
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tm->tm_isdst = 0;
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#ifdef TM_GMTOFF
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tm->TM_GMTOFF = 0;
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#endif
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#ifdef TM_ZONE
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tm->TM_ZONE = gmt;
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#endif
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bp += 3;
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} else {
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const unsigned char *ep;
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ep = find_string(bp, &i,
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(const char * const *)tzname,
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NULL, 2);
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if (ep != NULL) {
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tm->tm_isdst = i;
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#ifdef TM_GMTOFF
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tm->TM_GMTOFF = -(timezone);
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#endif
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#ifdef TM_ZONE
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tm->TM_ZONE = tzname[i];
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#endif
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}
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bp = ep;
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}
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continue;
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/*
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* Miscellaneous conversions.
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*/
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case 'n': /* Any kind of white-space. */
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case 't':
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while (isspace(*bp))
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bp++;
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LEGAL_ALT(0);
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continue;
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default: /* Unknown/unsupported conversion. */
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return NULL;
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}
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}
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return __UNCONST(bp);
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}
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static const u_char *
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conv_num(const unsigned char *buf, int *dest, uint llim, uint ulim)
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{
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uint result = 0;
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unsigned char ch;
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/* The limit also determines the number of valid digits. */
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uint rulim = ulim;
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ch = *buf;
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if (ch < '0' || ch > '9')
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return NULL;
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do {
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result *= 10;
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result += ch - '0';
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rulim /= 10;
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ch = *++buf;
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} while ((result * 10 <= ulim) && rulim && ch >= '0' && ch <= '9');
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if (result < llim || result > ulim)
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return NULL;
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*dest = result;
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return buf;
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}
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static const u_char *
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find_string(const u_char *bp, int *tgt, const char * const *n1,
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const char * const *n2, int c)
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{
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int i;
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unsigned int len;
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/* check full name - then abbreviated ones */
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for (; n1 != NULL; n1 = n2, n2 = NULL) {
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for (i = 0; i < c; i++, n1++) {
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len = strlen(*n1);
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if (strncasecmp(*n1, (const char *)bp, len) == 0) {
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*tgt = i;
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return bp + len;
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}
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}
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}
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/* Nothing matched */
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return NULL;
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}
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