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Diffstat (limited to 'StdLib/LibC/Time/timegm.c')
| -rw-r--r-- | StdLib/LibC/Time/timegm.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/StdLib/LibC/Time/timegm.c b/StdLib/LibC/Time/timegm.c new file mode 100644 index 0000000000..a672dc8da1 --- /dev/null +++ b/StdLib/LibC/Time/timegm.c @@ -0,0 +1,113 @@ +/** @file
+ timegm implementation
+
+ Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
+ This program and the accompanying materials are licensed and made available under
+ the terms and conditions of the BSD License that accompanies this distribution.
+ The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php.
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+ * Copyright (c) 1987, 1989 Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Arthur David Olson of the National Cancer Institute.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+
+static char *sccsid = "from: @(#)ctime.c 5.26 (Berkeley) 2/23/91";
+
+
+ * This implementation of mktime is lifted straight from the NetBSD (BSD 4.4)
+ * version. I modified it slightly to divorce it from the internals of the
+ * ctime library. Thus this version can't use details of the internal
+ * timezone state file to figure out strange unnormalized struct tm values,
+ * as might result from someone doing date math on the tm struct then passing
+ * it to mktime.
+ *
+ * It just does as well as it can at normalizing the tm input, then does a
+ * binary search of the time space using the system's localtime() function.
+ *
+ * The original binary search was defective in that it didn't consider the
+ * setting of tm_isdst when comparing tm values, causing the search to be
+ * flubbed for times near the dst/standard time changeover. The original
+ * code seems to make up for this by grubbing through the timezone info
+ * whenever the binary search barfed. Since I don't have that luxury in
+ * portable code, I have to take care of tm_isdst in the comparison routine.
+ * This requires knowing how many minutes offset dst is from standard time.
+ *
+ * So, if you live somewhere in the world where dst is not 60 minutes offset,
+ * and your vendor doesn't supply mktime(), you'll have to edit this variable
+ * by hand. Sorry about that.
+
+ $NetBSD: mktime.c,v 1.4 2006/06/11 19:34:10 kardel Exp $
+**/
+
+#include <LibConfig.h>
+#include <time.h>
+
+/*
+ This funciton is in Time.c, which has a different license than timegm.
+*/
+time_t
+time2(struct tm * const tmp, void (* const funcp)(const time_t*, long, struct tm*),
+ const long offset, int * const okayp);
+
+/*
+ This funciton is in Time.c, which has a different license than timegm.
+*/
+void
+gmtsub(
+ const time_t * const timep,
+ const long offset,
+ struct tm * const tmp
+ );
+
+#ifndef WRONG
+#define WRONG (-1)
+#endif /* !defined WRONG */
+
+/*
+ Convert a tm structure to a GMT based time_t.
+*/
+time_t timegm( struct tm * tmp )
+{
+ register time_t t;
+ int okay;
+
+ tmp->tm_isdst = 0;
+ t = time2(tmp, gmtsub, 0, &okay);
+ if (okay || tmp->tm_isdst < 0)
+ return t;
+
+ return WRONG;
+}
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