janwas
d19a2cba65
factor out the "atom_fn" mechanism into lib/allocators/string_pool.cpp factor out FAT date/time handling into lib/fat_time.cpp path_util: replace strcpy with SAFE_STRCPY; add additional functions that avoid passing an output buffer via StringPool This was SVN commit r5474.
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
/**
|
|
* =========================================================================
|
|
* File : fat_time.cpp
|
|
* Project : 0 A.D.
|
|
* Description : timestamp conversion: DOS FAT <-> Unix time_t
|
|
* =========================================================================
|
|
*/
|
|
|
|
// license: GPL; see lib/license.txt
|
|
|
|
#include "precompiled.h"
|
|
#include "fat_time.h"
|
|
|
|
#include <ctime>
|
|
|
|
#include "lib/bits.h"
|
|
|
|
|
|
time_t time_t_from_FAT(u32 fat_timedate)
|
|
{
|
|
const uint fat_time = bits(fat_timedate, 0, 15);
|
|
const uint fat_date = bits(fat_timedate, 16, 31);
|
|
|
|
struct tm t; // struct tm format:
|
|
t.tm_sec = bits(fat_time, 0,4) * 2; // [0,59]
|
|
t.tm_min = bits(fat_time, 5,10); // [0,59]
|
|
t.tm_hour = bits(fat_time, 11,15); // [0,23]
|
|
t.tm_mday = bits(fat_date, 0,4); // [1,31]
|
|
t.tm_mon = bits(fat_date, 5,8) - 1; // [0,11]
|
|
t.tm_year = bits(fat_date, 9,15) + 80; // since 1900
|
|
t.tm_isdst = -1; // unknown - let libc determine
|
|
|
|
// otherwise: totally bogus, and at the limit of 32-bit time_t
|
|
debug_assert(t.tm_year < 138);
|
|
|
|
time_t ret = mktime(&t);
|
|
debug_assert(ret != (time_t)-1); // mktime shouldn't fail
|
|
return ret;
|
|
}
|
|
|
|
|
|
u32 FAT_from_time_t(time_t time)
|
|
{
|
|
// (values are adjusted for DST)
|
|
struct tm* t = localtime(&time);
|
|
|
|
u16 fat_time = 0;
|
|
fat_time |= (t->tm_sec/2); // 5
|
|
fat_time |= (t->tm_min) << 5; // 6
|
|
fat_time |= (t->tm_hour) << 11; // 5
|
|
|
|
u16 fat_date = 0;
|
|
fat_date |= (t->tm_mday); // 5
|
|
fat_date |= (t->tm_mon+1) << 5; // 4
|
|
fat_date |= (t->tm_year-80) << 9; // 7
|
|
|
|
u32 fat_timedate = u32_from_u16(fat_date, fat_time);
|
|
return fat_timedate;
|
|
}
|