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author | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2012-08-04 22:00:18 +0000 |
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committer | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2012-08-04 22:00:18 +0000 |
commit | 3ec93230f35da971dc988b0f66e8023bb7f6fd51 (patch) | |
tree | 9a1530860e4051617d323eb401ee3b282cff6ca7 /nuttx/sched/clock_dow.c | |
parent | 2545e9bc4bbca11a60f93237c1da513c41a07f1a (diff) | |
download | px4-firmware-3ec93230f35da971dc988b0f66e8023bb7f6fd51.tar.gz px4-firmware-3ec93230f35da971dc988b0f66e8023bb7f6fd51.tar.bz2 px4-firmware-3ec93230f35da971dc988b0f66e8023bb7f6fd51.zip |
Fix max filename size report by FAT statfs with long file names; Add missing logic to support fieldwidth and justification for %s format; Add extended help options. Default help command just shows a short list of commands. Verbose and single command help options
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@5008 7fd9a85b-ad96-42d3-883c-3090e2eb8679
Diffstat (limited to 'nuttx/sched/clock_dow.c')
-rw-r--r-- | nuttx/sched/clock_dow.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/nuttx/sched/clock_dow.c b/nuttx/sched/clock_dow.c new file mode 100644 index 000000000..93bcfc2d9 --- /dev/null +++ b/nuttx/sched/clock_dow.c @@ -0,0 +1,88 @@ +/**************************************************************************** + * sched/clock_dow.c + * + * Copyright (C) 2012 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 <stdint.h> + +#include <nuttx/clock.h> + +#include "clock_internal.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/* 23 * (month + 1) / 9, month = 0..11 */ + +static const uint8_t g_lookup[12] = {2, 5, 7, 10, 12, 15, 17, 20, 23, 25, 28, 30}; + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: clock_dow + * + * Description: + * Calculate the day of week (DOW) from they year month and day. Based on + * an algorithm pubished in 1990 by Michael Keith and Tom Craver with some + * tweaks to handle months in the range 0-11. + * + * Parameters: + * year - year (e.g., 1988) + * month - 0 through 11 + * day - 1 through 31 + * + * Return Value: + * The day of the week as days since Sunday: 0 = Sunday, 1 = Monday, etc. + * + * Assumptions: + * + ****************************************************************************/ + +int clock_dow(int year, int month, int day) +{ + day += month < 2 ? year-- : year - 2; + return ((int)g_lookup[month] + day + 4 + year/4 - year/100 + year/400) % 7; +} |