Add a timegm implementation from Heimdal via Samba.

Fixes build on (at least Solaris 10).

LICENCE

@@ -231,6 +231,7 @@ OpenSSH contains no GPL code.
 	Eric P. Allman
 	The Regents of the University of California
 	Constantin S. Svintsoff
+	Kungliga Tekniska Högskolan
 
 	* Redistribution and use in source and binary forms, with or without
 	* modification, are permitted provided that the following conditions

configure.ac

@@ -1967,6 +1967,7 @@ AC_CHECK_FUNCS([ \
 	swap32 \
 	sysconf \
 	tcgetpgrp \
+	timegm \
 	timingsafe_bcmp \
 	truncate \
 	unsetenv \

openbsd-compat/Makefile.in

@@ -85,6 +85,7 @@ COMPAT= bsd-asprintf.o \
 	bsd-signal.o \
 	bsd-snprintf.o \
 	bsd-statvfs.o \
+	bsd-timegm.o \
 	bsd-waitpid.o \
 	fake-rfc2553.o \
 	getrrsetbyname-ldns.o \

openbsd-compat/bsd-timegm.c

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 1997 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * 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. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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. 
+ */
+
+/*
+  adapted for Samba4 by Andrew Tridgell
+*/
+
+#include "includes.h"
+
+#include <time.h>
+
+#ifndef HAVE_TIMEGM
+
+static int is_leap(unsigned y)
+{
+	y += 1900;
+	return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0);
+}
+
+time_t timegm(struct tm *tm)
+{
+	static const unsigned ndays[2][12] ={
+		{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
+		{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
+	time_t res = 0;
+	unsigned i;
+
+	if (tm->tm_mon > 12 ||
+	    tm->tm_mon < 0 ||
+	    tm->tm_mday > 31 ||
+	    tm->tm_min > 60 ||
+	    tm->tm_sec > 60 ||
+	    tm->tm_hour > 24) {
+		/* invalid tm structure */
+		return 0;
+	}
+	
+	for (i = 70; i < tm->tm_year; ++i)
+		res += is_leap(i) ? 366 : 365;
+	
+	for (i = 0; i < tm->tm_mon; ++i)
+		res += ndays[is_leap(tm->tm_year)][i];
+	res += tm->tm_mday - 1;
+	res *= 24;
+	res += tm->tm_hour;
+	res *= 60;
+	res += tm->tm_min;
+	res *= 60;
+	res += tm->tm_sec;
+	return res;
+}
+#endif /* HAVE_TIMEGM */

openbsd-compat/openbsd-compat.h

@@ -343,6 +343,10 @@ void freezero(void *, size_t);
 struct tm *localtime_r(const time_t *, struct tm *);
 #endif
 
+#ifndef HAVE_TIMEGM
+time_t timegm(struct tm *);
+#endif
+
 char *xcrypt(const char *password, const char *salt);
 char *shadow_pw(struct passwd *pw);