Adding upstream version 1:9.18.19.upstream/1%9.18.19

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 469 insertions, 0 deletions

diff --git a/lib/isc/tm.c b/lib/isc/tm.c
new file mode 100644
index 0000000..19a7bee
--- /dev/null
+++ b/lib/isc/tm.c
@@ -0,0 +1,469 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0 AND BSD-2-Clause
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*-
+ * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code was contributed to The NetBSD Foundation by Klaus Klein.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include <isc/tm.h>
+#include <isc/util.h>
+
+/*
+ * Portable conversion routines for struct tm, replacing
+ * timegm() and strptime(), which are not available on all
+ * platforms and don't always behave the same way when they
+ * are.
+ */
+
+/*
+ * We do not implement alternate representations. However, we always
+ * check whether a given modifier is allowed for a certain conversion.
+ */
+#define ALT_E 0x01
+#define ALT_O 0x02
+#define LEGAL_ALT(x)                          \
+	{                                     \
+		if ((alt_format & ~(x)) != 0) \
+			return ((0));         \
+	}
+
+#ifndef TM_YEAR_BASE
+#define TM_YEAR_BASE 1900
+#endif /* ifndef TM_YEAR_BASE */
+
+static const char *day[7] = { "Sunday",	  "Monday", "Tuesday", "Wednesday",
+			      "Thursday", "Friday", "Saturday" };
+static const char *abday[7] = {
+	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+};
+static const char *mon[12] = {
+	"January", "February", "March",	    "April",   "May",	   "June",
+	"July",	   "August",   "September", "October", "November", "December"
+};
+static const char *abmon[12] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+				 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
+static const char *am_pm[2] = { "AM", "PM" };
+
+static int
+conv_num(const char **buf, int *dest, int llim, int ulim) {
+	int result = 0;
+
+	/* The limit also determines the number of valid digits. */
+	int rulim = ulim;
+
+	if (!isdigit((unsigned char)**buf)) {
+		return (0);
+	}
+
+	do {
+		result *= 10;
+		result += *(*buf)++ - '0';
+		rulim /= 10;
+	} while ((result * 10 <= ulim) && rulim && **buf >= '0' &&
+		 **buf <= '9');
+
+	if (result < llim || result > ulim) {
+		return (0);
+	}
+
+	*dest = result;
+	return (1);
+}
+
+time_t
+isc_tm_timegm(struct tm *tm) {
+	time_t ret;
+	int i, yday = 0, leapday;
+	int mdays[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30 };
+
+	leapday = ((((tm->tm_year + 1900) % 4) == 0 &&
+		    ((tm->tm_year + 1900) % 100) != 0) ||
+		   ((tm->tm_year + 1900) % 400) == 0)
+			  ? 1
+			  : 0;
+	mdays[1] += leapday;
+
+	yday = tm->tm_mday - 1;
+	for (i = 1; i <= tm->tm_mon; i++) {
+		yday += mdays[i - 1];
+	}
+	ret = tm->tm_sec + (60 * tm->tm_min) + (3600 * tm->tm_hour) +
+	      (86400 *
+	       (yday + ((tm->tm_year - 70) * 365) + ((tm->tm_year - 69) / 4) -
+		((tm->tm_year - 1) / 100) + ((tm->tm_year + 299) / 400)));
+	return (ret);
+}
+
+char *
+isc_tm_strptime(const char *buf, const char *fmt, struct tm *tm) {
+	char c, *ret;
+	const char *bp;
+	size_t len = 0;
+	int alt_format, i, split_year = 0;
+
+	REQUIRE(buf != NULL);
+	REQUIRE(fmt != NULL);
+	REQUIRE(tm != NULL);
+
+	memset(tm, 0, sizeof(struct tm));
+
+	bp = buf;
+
+	while ((c = *fmt) != '\0') {
+		/* Clear `alternate' modifier prior to new conversion. */
+		alt_format = 0;
+
+		/* Eat up white-space. */
+		if (isspace((unsigned char)c)) {
+			while (isspace((unsigned char)*bp)) {
+				bp++;
+			}
+
+			fmt++;
+			continue;
+		}
+
+		if ((c = *fmt++) != '%') {
+			goto literal;
+		}
+
+	again:
+		switch (c = *fmt++) {
+		case '%': /* "%%" is converted to "%". */
+		literal:
+			if (c != *bp++) {
+				return (0);
+			}
+			break;
+
+		/*
+		 * "Alternative" modifiers. Just set the appropriate flag
+		 * and start over again.
+		 */
+		case 'E': /* "%E?" alternative conversion modifier. */
+			LEGAL_ALT(0);
+			alt_format |= ALT_E;
+			goto again;
+
+		case 'O': /* "%O?" alternative conversion modifier. */
+			LEGAL_ALT(0);
+			alt_format |= ALT_O;
+			goto again;
+
+		/*
+		 * "Complex" conversion rules, implemented through recursion.
+		 */
+		case 'c': /* Date and time, using the locale's format. */
+			LEGAL_ALT(ALT_E);
+			if (!(bp = isc_tm_strptime(bp, "%x %X", tm))) {
+				return (0);
+			}
+			break;
+
+		case 'D': /* The date as "%m/%d/%y". */
+			LEGAL_ALT(0);
+			if (!(bp = isc_tm_strptime(bp, "%m/%d/%y", tm))) {
+				return (0);
+			}
+			break;
+
+		case 'R': /* The time as "%H:%M". */
+			LEGAL_ALT(0);
+			if (!(bp = isc_tm_strptime(bp, "%H:%M", tm))) {
+				return (0);
+			}
+			break;
+
+		case 'r': /* The time in 12-hour clock representation. */
+			LEGAL_ALT(0);
+			if (!(bp = isc_tm_strptime(bp, "%I:%M:%S %p", tm))) {
+				return (0);
+			}
+			break;
+
+		case 'T': /* The time as "%H:%M:%S". */
+			LEGAL_ALT(0);
+			if (!(bp = isc_tm_strptime(bp, "%H:%M:%S", tm))) {
+				return (0);
+			}
+			break;
+
+		case 'X': /* The time, using the locale's format. */
+			LEGAL_ALT(ALT_E);
+			if (!(bp = isc_tm_strptime(bp, "%H:%M:%S", tm))) {
+				return (0);
+			}
+			break;
+
+		case 'x': /* The date, using the locale's format. */
+			LEGAL_ALT(ALT_E);
+			if (!(bp = isc_tm_strptime(bp, "%m/%d/%y", tm))) {
+				return (0);
+			}
+			break;
+
+		/*
+		 * "Elementary" conversion rules.
+		 */
+		case 'A': /* The day of week, using the locale's form. */
+		case 'a':
+			LEGAL_ALT(0);
+			for (i = 0; i < 7; i++) {
+				/* Full name. */
+				len = strlen(day[i]);
+				if (strncasecmp(day[i], bp, len) == 0) {
+					break;
+				}
+
+				/* Abbreviated name. */
+				len = strlen(abday[i]);
+				if (strncasecmp(abday[i], bp, len) == 0) {
+					break;
+				}
+			}
+
+			/* Nothing matched. */
+			if (i == 7) {
+				return (0);
+			}
+
+			tm->tm_wday = i;
+			bp += len;
+			break;
+
+		case 'B': /* The month, using the locale's form. */
+		case 'b':
+		case 'h':
+			LEGAL_ALT(0);
+			for (i = 0; i < 12; i++) {
+				/* Full name. */
+				len = strlen(mon[i]);
+				if (strncasecmp(mon[i], bp, len) == 0) {
+					break;
+				}
+
+				/* Abbreviated name. */
+				len = strlen(abmon[i]);
+				if (strncasecmp(abmon[i], bp, len) == 0) {
+					break;
+				}
+			}
+
+			/* Nothing matched. */
+			if (i == 12) {
+				return (0);
+			}
+
+			tm->tm_mon = i;
+			bp += len;
+			break;
+
+		case 'C': /* The century number. */
+			LEGAL_ALT(ALT_E);
+			if (!(conv_num(&bp, &i, 0, 99))) {
+				return (0);
+			}
+
+			if (split_year) {
+				tm->tm_year = (tm->tm_year % 100) + (i * 100);
+			} else {
+				tm->tm_year = i * 100;
+				split_year = 1;
+			}
+			break;
+
+		case 'd': /* The day of month. */
+		case 'e':
+			LEGAL_ALT(ALT_O);
+			if (!(conv_num(&bp, &tm->tm_mday, 1, 31))) {
+				return (0);
+			}
+			break;
+
+		case 'k': /* The hour (24-hour clock representation). */
+			LEGAL_ALT(0);
+			FALLTHROUGH;
+		case 'H':
+			LEGAL_ALT(ALT_O);
+			if (!(conv_num(&bp, &tm->tm_hour, 0, 23))) {
+				return (0);
+			}
+			break;
+
+		case 'l': /* The hour (12-hour clock representation). */
+			LEGAL_ALT(0);
+			FALLTHROUGH;
+		case 'I':
+			LEGAL_ALT(ALT_O);
+			if (!(conv_num(&bp, &tm->tm_hour, 1, 12))) {
+				return (0);
+			}
+			if (tm->tm_hour == 12) {
+				tm->tm_hour = 0;
+			}
+			break;
+
+		case 'j': /* The day of year. */
+			LEGAL_ALT(0);
+			if (!(conv_num(&bp, &i, 1, 366))) {
+				return (0);
+			}
+			tm->tm_yday = i - 1;
+			break;
+
+		case 'M': /* The minute. */
+			LEGAL_ALT(ALT_O);
+			if (!(conv_num(&bp, &tm->tm_min, 0, 59))) {
+				return (0);
+			}
+			break;
+
+		case 'm': /* The month. */
+			LEGAL_ALT(ALT_O);
+			if (!(conv_num(&bp, &i, 1, 12))) {
+				return (0);
+			}
+			tm->tm_mon = i - 1;
+			break;
+
+		case 'p': /* The locale's equivalent of AM/PM. */
+			LEGAL_ALT(0);
+			/* AM? */
+			if (strcasecmp(am_pm[0], bp) == 0) {
+				if (tm->tm_hour > 11) {
+					return (0);
+				}
+
+				bp += strlen(am_pm[0]);
+				break;
+			}
+			/* PM? */
+			else if (strcasecmp(am_pm[1], bp) == 0)
+			{
+				if (tm->tm_hour > 11) {
+					return (0);
+				}
+
+				tm->tm_hour += 12;
+				bp += strlen(am_pm[1]);
+				break;
+			}
+
+			/* Nothing matched. */
+			return (0);
+
+		case 'S': /* The seconds. */
+			LEGAL_ALT(ALT_O);
+			if (!(conv_num(&bp, &tm->tm_sec, 0, 61))) {
+				return (0);
+			}
+			break;
+
+		case 'U': /* The week of year, beginning on sunday. */
+		case 'W': /* The week of year, beginning on monday. */
+			LEGAL_ALT(ALT_O);
+			/*
+			 * XXX This is bogus, as we can not assume any valid
+			 * information present in the tm structure at this
+			 * point to calculate a real value, so just check the
+			 * range for now.
+			 */
+			if (!(conv_num(&bp, &i, 0, 53))) {
+				return (0);
+			}
+			break;
+
+		case 'w': /* The day of week, beginning on sunday. */
+			LEGAL_ALT(ALT_O);
+			if (!(conv_num(&bp, &tm->tm_wday, 0, 6))) {
+				return (0);
+			}
+			break;
+
+		case 'Y': /* The year. */
+			LEGAL_ALT(ALT_E);
+			if (!(conv_num(&bp, &i, 0, 9999))) {
+				return (0);
+			}
+
+			tm->tm_year = i - TM_YEAR_BASE;
+			break;
+
+		case 'y': /* The year within 100 years of the epoch. */
+			LEGAL_ALT(ALT_E | ALT_O);
+			if (!(conv_num(&bp, &i, 0, 99))) {
+				return (0);
+			}
+
+			if (split_year) {
+				tm->tm_year = ((tm->tm_year / 100) * 100) + i;
+				break;
+			}
+			split_year = 1;
+			if (i <= 68) {
+				tm->tm_year = i + 2000 - TM_YEAR_BASE;
+			} else {
+				tm->tm_year = i + 1900 - TM_YEAR_BASE;
+			}
+			break;
+
+		/*
+		 * Miscellaneous conversions.
+		 */
+		case 'n': /* Any kind of white-space. */
+		case 't':
+			LEGAL_ALT(0);
+			while (isspace((unsigned char)*bp)) {
+				bp++;
+			}
+			break;
+
+		default: /* Unknown/unsupported conversion. */
+			return (0);
+		}
+	}
+
+	/* LINTED functional specification */
+	DE_CONST(bp, ret);
+	return (ret);
+}