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120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/*
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filetime.c
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Conversion of file time and date values to various other types
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Copyright (c) 2006 Michael "Chishm" Chisholm
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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2006-07-11 - Chishm
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* Original release
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2006-09-30 - Chishm
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* Validity checks performed on the time supplied by the IPC
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* Cleaned up magic numbers
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2006-10-01 - Chishm
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* Fixed incorrect use of bitwise-or instead of logical-or
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2007-10-30 - Chishm
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* Uses standard POSIX time functions
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*/
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#include <time.h>
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#include "filetime.h"
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#define MAX_HOUR 23
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#define MAX_MINUTE 59
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#define MAX_SECOND 59
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#define MAX_MONTH 12
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#define MIN_MONTH 1
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#define MAX_DAY 31
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#define MIN_DAY 1
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u16 _FAT_filetime_getTimeFromRTC (void) {
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#ifdef NDS
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struct tm timeParts;
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time_t epochTime;
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if (time(&epochTime) == (time_t)-1) {
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return 0;
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}
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localtime_r(&epochTime, &timeParts);
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// Check that the values are all in range.
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// If they are not, return 0 (no timestamp)
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if ((timeParts.tm_hour < 0) || (timeParts.tm_hour > MAX_HOUR)) return 0;
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if ((timeParts.tm_min < 0) || (timeParts.tm_min > MAX_MINUTE)) return 0;
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if ((timeParts.tm_sec < 0) || (timeParts.tm_sec > MAX_SECOND)) return 0;
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return (
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((timeParts.tm_hour & 0x1F) << 11) |
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((timeParts.tm_min & 0x3F) << 5) |
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((timeParts.tm_sec >> 1) & 0x1F)
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);
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#else
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return 0;
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#endif
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}
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u16 _FAT_filetime_getDateFromRTC (void) {
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#ifdef NDS
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struct tm timeParts;
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time_t epochTime;
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if (time(&epochTime) == (time_t)-1) {
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return 0;
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}
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localtime_r(&epochTime, &timeParts);
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if ((timeParts.tm_mon < MIN_MONTH) || (timeParts.tm_mon > MAX_MONTH)) return 0;
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if ((timeParts.tm_mday < MIN_DAY) || (timeParts.tm_mday > MAX_DAY)) return 0;
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return (
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(((timeParts.tm_year - 80) & 0x7F) <<9) | // Adjust for MS-FAT base year (1980 vs 1900 for tm_year)
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((timeParts.tm_mon & 0xF) << 5) |
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(timeParts.tm_mday & 0x1F)
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);
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#else
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return 0;
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#endif
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}
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time_t _FAT_filetime_to_time_t (u16 t, u16 d) {
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struct tm timeParts;
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timeParts.tm_hour = t >> 11;
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timeParts.tm_min = (t >> 5) & 0x3F;
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timeParts.tm_sec = (t & 0x1F) << 1;
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timeParts.tm_mday = d & 0x1F;
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timeParts.tm_mon = (d >> 5) & 0x0F;
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timeParts.tm_year = d >> 9;
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timeParts.tm_isdst = 0;
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return mktime(&timeParts);
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}
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