--- /dev/null
+/** @file \r
+ timegm implementation\r
+\r
+ Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>\r
+ This program and the accompanying materials are licensed and made available under\r
+ the terms and conditions of the BSD License that accompanies this distribution.\r
+ The full text of the license may be found at\r
+ http://opensource.org/licenses/bsd-license.php.\r
+\r
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+\r
+ * Copyright (c) 1987, 1989 Regents of the University of California.\r
+ * All rights reserved.\r
+ *\r
+ * This code is derived from software contributed to Berkeley by\r
+ * Arthur David Olson of the National Cancer Institute.\r
+ *\r
+ * Redistribution and use in source and binary forms, with or without\r
+ * modification, are permitted provided that the following conditions\r
+ * are met:\r
+ * 1. Redistributions of source code must retain the above copyright\r
+ * notice, this list of conditions and the following disclaimer.\r
+ * 2. Redistributions in binary form must reproduce the above copyright\r
+ * notice, this list of conditions and the following disclaimer in the\r
+ * documentation and/or other materials provided with the distribution.\r
+ * 3. All advertising materials mentioning features or use of this software\r
+ * must display the following acknowledgement:\r
+ * This product includes software developed by the University of\r
+ * California, Berkeley and its contributors.\r
+ * 4. Neither the name of the University nor the names of its contributors\r
+ * may be used to endorse or promote products derived from this software\r
+ * without specific prior written permission.\r
+ *\r
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
+ * SUCH DAMAGE.\r
+\r
+static char *sccsid = "from: @(#)ctime.c 5.26 (Berkeley) 2/23/91";\r
+\r
+\r
+ * This implementation of mktime is lifted straight from the NetBSD (BSD 4.4)\r
+ * version. I modified it slightly to divorce it from the internals of the\r
+ * ctime library. Thus this version can't use details of the internal\r
+ * timezone state file to figure out strange unnormalized struct tm values,\r
+ * as might result from someone doing date math on the tm struct then passing\r
+ * it to mktime.\r
+ *\r
+ * It just does as well as it can at normalizing the tm input, then does a\r
+ * binary search of the time space using the system's localtime() function.\r
+ *\r
+ * The original binary search was defective in that it didn't consider the\r
+ * setting of tm_isdst when comparing tm values, causing the search to be\r
+ * flubbed for times near the dst/standard time changeover. The original\r
+ * code seems to make up for this by grubbing through the timezone info\r
+ * whenever the binary search barfed. Since I don't have that luxury in\r
+ * portable code, I have to take care of tm_isdst in the comparison routine.\r
+ * This requires knowing how many minutes offset dst is from standard time.\r
+ *\r
+ * So, if you live somewhere in the world where dst is not 60 minutes offset,\r
+ * and your vendor doesn't supply mktime(), you'll have to edit this variable\r
+ * by hand. Sorry about that.\r
+\r
+ $NetBSD: mktime.c,v 1.4 2006/06/11 19:34:10 kardel Exp $\r
+**/\r
+\r
+#include <LibConfig.h>\r
+#include <time.h>\r
+\r
+/*\r
+ This funciton is in Time.c, which has a different license than timegm.\r
+*/\r
+time_t \r
+time2(struct tm * const tmp, void (* const funcp)(const time_t*, long, struct tm*),\r
+ const long offset, int * const okayp);\r
+\r
+/*\r
+ This funciton is in Time.c, which has a different license than timegm.\r
+*/\r
+void\r
+gmtsub(\r
+ const time_t * const timep,\r
+ const long offset,\r
+ struct tm * const tmp\r
+ );\r
+\r
+#ifndef WRONG\r
+#define WRONG (-1)\r
+#endif /* !defined WRONG */\r
+\r
+/*\r
+ Convert a tm structure to a GMT based time_t.\r
+*/\r
+time_t timegm( struct tm * tmp )\r
+{\r
+ register time_t t;\r
+ int okay;\r
+\r
+ tmp->tm_isdst = 0;\r
+ t = time2(tmp, gmtsub, 0, &okay);\r
+ if (okay || tmp->tm_isdst < 0)\r
+ return t;\r
+\r
+ return WRONG;\r
+}
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