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Diffstat (limited to 'nuttx/libc/time/lib_mktime.c')
-rw-r--r-- | nuttx/libc/time/lib_mktime.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/nuttx/libc/time/lib_mktime.c b/nuttx/libc/time/lib_mktime.c new file mode 100644 index 000000000..25254d70e --- /dev/null +++ b/nuttx/libc/time/lib_mktime.c @@ -0,0 +1,141 @@ +/**************************************************************************** + * libc/time/lib_mktime.c + * + * Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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 <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(const 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 or longer days where leap + * seconds, etc. apply. + */ + +time_t mktime(const 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. */ + + days += (time_t)clock_daysbeforemonth(tp->tm_mon, clock_isleapyear(tp->tm_year + 1900)); + + /* 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 */ + |