402 lines
9.3 KiB
C
402 lines
9.3 KiB
C
/* $OpenBSD: strptime.c,v 1.12 2008/06/26 05:42:05 ray Exp $ */
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/* $NetBSD: strptime.c,v 1.12 1998/01/20 21:39:40 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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*
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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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/* OPENBSD ORIGINAL: lib/libc/time/strptime.c */
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#include "includes.h"
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#ifndef HAVE_STRPTIME
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#define TM_YEAR_BASE 1900 /* from tzfile.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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/* #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 (0); }
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static int _conv_num(const unsigned char **, int *, int, int);
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static char *_strptime(const char *, const char *, struct tm *, 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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return(_strptime(buf, fmt, tm, 1));
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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 initialize)
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{
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unsigned char c;
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const unsigned char *bp;
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size_t len;
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int alt_format, i;
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static int century, relyear;
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if (initialize) {
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century = TM_YEAR_BASE;
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relyear = -1;
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}
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bp = (unsigned char *)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 (NULL);
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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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#if 0
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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, 0)))
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return (NULL);
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break;
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#endif
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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, 0)))
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return (NULL);
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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, 0)))
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return (NULL);
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break;
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case 'r': /* The time as "%I:%M:%S %p". */
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_LEGAL_ALT(0);
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if (!(bp = _strptime(bp, "%I:%M:%S %p", tm, 0)))
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return (NULL);
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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, 0)))
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return (NULL);
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break;
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#if 0
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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, 0)))
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return (NULL);
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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, 0)))
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return (NULL);
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break;
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#endif
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/*
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* "Elementary" conversion rules.
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*/
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#if 0
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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 (NULL);
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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 (NULL);
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tm->tm_mon = i;
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bp += len;
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break;
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#endif
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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 (NULL);
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century = i * 100;
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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 (NULL);
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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 (NULL);
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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 (NULL);
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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, &tm->tm_yday, 1, 366)))
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return (NULL);
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tm->tm_yday--;
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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 (NULL);
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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, &tm->tm_mon, 1, 12)))
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return (NULL);
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tm->tm_mon--;
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break;
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#if 0
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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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len = strlen(_ctloc(am_pm[0]));
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if (strncasecmp(_ctloc(am_pm[0]), bp, len) == 0) {
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if (tm->tm_hour > 12) /* i.e., 13:00 AM ?! */
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return (NULL);
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else if (tm->tm_hour == 12)
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tm->tm_hour = 0;
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bp += len;
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break;
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}
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/* PM? */
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len = strlen(_ctloc(am_pm[1]));
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if (strncasecmp(_ctloc(am_pm[1]), bp, len) == 0) {
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if (tm->tm_hour > 12) /* i.e., 13:00 PM ?! */
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return (NULL);
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else if (tm->tm_hour < 12)
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tm->tm_hour += 12;
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bp += len;
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break;
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}
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/* Nothing matched. */
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return (NULL);
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#endif
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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 (NULL);
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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 (NULL);
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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 (NULL);
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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 (NULL);
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relyear = -1;
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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 the century (2 digits). */
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_LEGAL_ALT(_ALT_E | _ALT_O);
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if (!(_conv_num(&bp, &relyear, 0, 99)))
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return (NULL);
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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 (NULL);
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}
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}
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/*
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* We need to evaluate the two digit year spec (%y)
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* last as we can get a century spec (%C) at any time.
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*/
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if (relyear != -1) {
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if (century == TM_YEAR_BASE) {
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if (relyear <= 68)
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tm->tm_year = relyear + 2000 - TM_YEAR_BASE;
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else
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tm->tm_year = relyear + 1900 - TM_YEAR_BASE;
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} else {
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tm->tm_year = relyear + century - TM_YEAR_BASE;
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}
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}
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return ((char *)bp);
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}
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static int
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_conv_num(const unsigned char **buf, int *dest, int llim, int ulim)
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{
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int result = 0;
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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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/* we use rulim to break out of the loop when we run out of digits */
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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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#endif /* HAVE_STRPTIME */
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