mktime/gmtime_r moved and highly simplified

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1973 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 149 insertions, 0 deletions

diff --git a/nuttx/lib/lib_mktime.c b/nuttx/lib/lib_mktime.c
new file mode 100644
index 000000000..594a0672b
--- /dev/null
+++ b/nuttx/lib/lib_mktime.c
@@ -0,0 +1,149 @@
+/****************************************************************************
+ * lib/lib_mktime.c
+ *
+ *   Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 NuttX 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+
+#include <time.h>
+#include <debug.h>
+
+#include <nuttx/time.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  mktime
+ *
+ * Description:
+ *  Time conversion (based on the POSIX API)
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_GREGORIAN_TIME
+time_t mktime(struct tm *tp)
+{
+  time_t ret;
+  time_t jdn;
+
+  /* Get the EPOCH-relative julian date from the calendar year,
+   * month, and date
+   */
+
+  jdn = clock_calendar2utc(tp->tm_year+1900, tp->tm_mon+1, tp->tm_mday);
+  sdbg("jdn=%d tm_year=%d tm_mon=%d tm_mday=%d\n",
+       (int)jdn, tp->tm_year, tp->tm_mon, tp->tm_mday);
+
+  /* Return the seconds into the julian day. */
+
+  ret = ((jdn*24 + tp->tm_hour)*60 + tp->tm_min)*60 + tp->tm_sec;
+  sdbg("ret=%d tm_hour=%d tm_min=%d tm_sec=%d\n",
+       (int)ret, tp->tm_hour, tp->tm_min, tp->tm_sec);
+
+  return ret;
+}
+#else
+
+/* Simple version that only works for dates within a (relatively) small range
+ * from the epoch.  It does not handle earlier days on longer days where leap
+ * seconds, etc. apply.
+ */
+
+time_t mktime(struct tm *tp)
+{
+  unsigned int days;
+
+  /* Years since epoch in units of days (ignoring leap years). */
+
+  days = (tp->tm_year - 70) * 365;
+
+  /* Add in the extra days for the leap years prior to the current year. */
+
+  days += (tp->tm_year - 69) >> 2;
+
+  /* Add in the days up to the beginning of this month (ignoring any possible leap day). */
+
+  days += (time_t)g_daysbeforemonth[tp->tm_mon];
+
+  /* Add in the leap day for this year (months are zero based) */
+
+  if (tp->tm_mon >= 2 && clock_isleapyear(tp->tm_year + 1900))
+    {
+      days++;
+    }
+
+  /* Add in the days since the beginning of this month (days are 1-based). */
+
+  days += tp->tm_mday - 1;
+
+  /* Then convert the seconds and add in hours, minutes, and seconds */
+
+  return ((days * 24 + tp->tm_hour) * 60 + tp->tm_min) * 60 + tp->tm_sec;
+}
+#endif /* CONFIG_GREGORIAN_TIME */
+