minix/lib/libhgfs/time.c

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/* Part of libhgfs - (c) 2009, D.C. van Moolenbroek */
#include "inc.h"
PRIVATE u64_t time_offset;
/*===========================================================================*
* time_init *
*===========================================================================*/
PUBLIC void time_init()
{
/* Initialize the time conversion module.
*/
/* Generate a 64-bit value for the offset to use in time conversion. The
* HGFS time format uses Windows' FILETIME standard, expressing time in
* 100ns-units since Jan 1, 1601 UTC. The value that is generated is
* 116444736000000000.
*/
/* FIXME: we currently do not take into account timezones. */
time_offset = make64(3577643008UL, 27111902UL);
}
/*===========================================================================*
* time_put *
*===========================================================================*/
PUBLIC void time_put(timep)
time_t *timep;
{
/* Store a UNIX timestamp pointed to by the given pointer onto the RPC buffer,
* in HGFS timestamp format. If a NULL pointer is given, store a timestamp of
* zero instead.
*/
u64_t hgfstime;
if (timep != NULL) {
hgfstime = add64(mul64u(*timep, 10000000), time_offset);
RPC_NEXT32 = ex64lo(hgfstime);
RPC_NEXT32 = ex64hi(hgfstime);
} else {
RPC_NEXT32 = 0;
RPC_NEXT32 = 0;
}
}
/*===========================================================================*
* time_get *
*===========================================================================*/
PUBLIC void time_get(timep)
time_t *timep;
{
/* Get a HGFS timestamp from the RPC buffer, convert it into a UNIX timestamp,
* and store the result in the given time pointer. If the given pointer is
* NULL, however, simply skip over the timestamp in the RPC buffer.
*/
u64_t hgfstime;
u32_t time_lo, time_hi;
if (timep != NULL) {
time_lo = RPC_NEXT32;
time_hi = RPC_NEXT32;
hgfstime = make64(time_lo, time_hi);
*timep = div64u(sub64(hgfstime, time_offset), 10000000);
}
else RPC_ADVANCE(sizeof(u32_t) * 2);
}