395 lines
9.1 KiB
C
395 lines
9.1 KiB
C
/* $NetBSD: strptime.c,v 1.19 2000/01/22 22:19:22 mycroft Exp $ */
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/*-
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* Copyright (c) 1997, 1998 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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*
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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 1.19 2000/01/22 22:19:22 mycroft 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) __CONCAT(_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 (0); }
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static int conv_num __P((const char **, int *, int, int));
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char *
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strptime(buf, fmt, tm)
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const char *buf, *fmt;
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struct tm *tm;
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{
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char c;
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const char *bp;
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size_t len = 0;
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int alt_format, i, split_year = 0;
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bp = buf;
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while ((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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/* 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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fmt++;
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continue;
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}
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if ((c = *fmt++) != '%')
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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 (0);
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break;
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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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LEGAL_ALT(ALT_E);
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if (!(bp = strptime(bp, _ctloc(d_t_fmt), tm)))
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return (0);
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break;
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case 'D': /* The date as "%m/%d/%y". */
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LEGAL_ALT(0);
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if (!(bp = strptime(bp, "%m/%d/%y", tm)))
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return (0);
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break;
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case 'R': /* The time as "%H:%M". */
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LEGAL_ALT(0);
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if (!(bp = strptime(bp, "%H:%M", tm)))
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return (0);
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break;
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case 'r': /* The time in 12-hour clock representation. */
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LEGAL_ALT(0);
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if (!(bp = strptime(bp, _ctloc(t_fmt_ampm), tm)))
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return (0);
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break;
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case 'T': /* The time as "%H:%M:%S". */
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LEGAL_ALT(0);
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if (!(bp = strptime(bp, "%H:%M:%S", tm)))
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return (0);
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break;
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case 'X': /* The time, using the locale's format. */
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LEGAL_ALT(ALT_E);
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if (!(bp = strptime(bp, _ctloc(t_fmt), tm)))
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return (0);
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break;
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case 'x': /* The date, using the locale's format. */
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LEGAL_ALT(ALT_E);
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if (!(bp = strptime(bp, _ctloc(d_fmt), tm)))
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return (0);
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break;
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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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LEGAL_ALT(0);
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for (i = 0; i < 7; i++) {
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/* Full name. */
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len = strlen(_ctloc(day[i]));
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if (strncasecmp(_ctloc(day[i]), bp, len) == 0)
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break;
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/* Abbreviated name. */
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len = strlen(_ctloc(abday[i]));
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if (strncasecmp(_ctloc(abday[i]), bp, len) == 0)
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break;
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}
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/* Nothing matched. */
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if (i == 7)
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return (0);
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tm->tm_wday = i;
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bp += len;
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break;
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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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LEGAL_ALT(0);
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for (i = 0; i < 12; i++) {
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/* Full name. */
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len = strlen(_ctloc(mon[i]));
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if (strncasecmp(_ctloc(mon[i]), bp, len) == 0)
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break;
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/* Abbreviated name. */
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len = strlen(_ctloc(abmon[i]));
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if (strncasecmp(_ctloc(abmon[i]), bp, len) == 0)
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break;
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}
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/* Nothing matched. */
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if (i == 12)
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return (0);
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tm->tm_mon = i;
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bp += len;
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break;
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case 'C': /* The century number. */
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LEGAL_ALT(ALT_E);
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if (!(conv_num(&bp, &i, 0, 99)))
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return (0);
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if (split_year) {
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tm->tm_year = (tm->tm_year % 100) + (i * 100);
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} else {
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tm->tm_year = i * 100;
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split_year = 1;
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}
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break;
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case 'd': /* The day of month. */
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case 'e':
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LEGAL_ALT(ALT_O);
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if (!(conv_num(&bp, &tm->tm_mday, 1, 31)))
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return (0);
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break;
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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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LEGAL_ALT(ALT_O);
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if (!(conv_num(&bp, &tm->tm_hour, 0, 23)))
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return (0);
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break;
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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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LEGAL_ALT(ALT_O);
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if (!(conv_num(&bp, &tm->tm_hour, 1, 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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break;
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case 'j': /* The day of year. */
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LEGAL_ALT(0);
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if (!(conv_num(&bp, &i, 1, 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': /* The minute. */
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LEGAL_ALT(ALT_O);
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if (!(conv_num(&bp, &tm->tm_min, 0, 59)))
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return (0);
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break;
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case 'm': /* The month. */
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LEGAL_ALT(ALT_O);
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if (!(conv_num(&bp, &i, 1, 12)))
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return (0);
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tm->tm_mon = i - 1;
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break;
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case 'p': /* The locale's equivalent of AM/PM. */
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LEGAL_ALT(0);
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/* AM? */
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if (strcasecmp(_ctloc(am_pm[0]), bp) == 0) {
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if (tm->tm_hour > 11)
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return (0);
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bp += strlen(_ctloc(am_pm[0]));
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break;
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}
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/* PM? */
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else if (strcasecmp(_ctloc(am_pm[1]), bp) == 0) {
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if (tm->tm_hour > 11)
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return (0);
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tm->tm_hour += 12;
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bp += strlen(_ctloc(am_pm[1]));
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break;
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}
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/* Nothing matched. */
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return (0);
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case 'S': /* The seconds. */
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LEGAL_ALT(ALT_O);
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if (!(conv_num(&bp, &tm->tm_sec, 0, 61)))
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return (0);
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break;
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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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LEGAL_ALT(ALT_O);
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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 (!(conv_num(&bp, &i, 0, 53)))
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return (0);
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break;
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case 'w': /* The day of week, beginning on sunday. */
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LEGAL_ALT(ALT_O);
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if (!(conv_num(&bp, &tm->tm_wday, 0, 6)))
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return (0);
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break;
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case 'Y': /* The year. */
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LEGAL_ALT(ALT_E);
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if (!(conv_num(&bp, &i, 0, 9999)))
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return (0);
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tm->tm_year = i - TM_YEAR_BASE;
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break;
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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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if (!(conv_num(&bp, &i, 0, 99)))
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return (0);
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if (split_year) {
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tm->tm_year = ((tm->tm_year / 100) * 100) + i;
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break;
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}
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split_year = 1;
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if (i <= 68)
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tm->tm_year = i + 2000 - TM_YEAR_BASE;
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else
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tm->tm_year = i + 1900 - TM_YEAR_BASE;
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break;
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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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LEGAL_ALT(0);
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while (isspace(*bp))
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bp++;
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break;
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default: /* Unknown/unsupported conversion. */
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return (0);
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}
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}
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/* LINTED functional specification */
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return ((char *)bp);
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}
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static int
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conv_num(buf, dest, llim, ulim)
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const char **buf;
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int *dest;
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int llim, ulim;
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{
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int result = 0;
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/* The limit also determines the number of valid digits. */
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int rulim = ulim;
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if (**buf < '0' || **buf > '9')
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return (0);
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do {
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result *= 10;
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result += *(*buf)++ - '0';
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rulim /= 10;
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} while ((result * 10 <= ulim) && rulim && **buf >= '0' && **buf <= '9');
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if (result < llim || result > ulim)
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return (0);
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*dest = result;
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return (1);
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}
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