osd-contiki/apps/time/resource_timestamp.c
Ralf Schlatterbeck d5284eebe1 Factor resources, fix time
Now there is a generic resource that can generate and parse
application/json as well as text/plain. It can be re-used, only the
from_string and to_string routines have to be written and the resource
properly set up. A new resource format is specified, see
GENERIC_RESOURCE in, e.g., examples/osd/pwm-example. This is now used in
all my examples, namely pwm-example, arduino-sketch, wallclock-time.

There was an off by one error for the month in time formatting (in
gmtime and localtime). And the leap-year computation was broken. Both
fixed now, so we get a correct date. For localtime we are still 2 hours
off because daylight saving isn't implemented yet.

Also renamed gmtime to utc.
2014-11-19 13:53:12 +01:00

62 lines
1.4 KiB
C

/**
* \file
* Resource for timestamp handling
* \author
* Ralf Schlatterbeck <rsc@runtux.com>
*
* \brief get/put time in seconds since 1970 (UNIX time)
* Note: the internal format of the time in seconds is a 64bit number
* unfortunately javascript (json) will only support double for which
* the mantissa isn't long enough for representing that number. So we're
* back to 32 bit and have a year 2038 problem.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "contiki.h"
#include "time.h"
#include "time_resource.h"
#include "jsonparse.h"
/* Only coap 13 for now */
#include "er-coap-13.h"
#include "generic_resource.h"
void timestamp_from_string (const char *name, const char *s)
{
struct timeval tv;
// FIXME: Platform has no strtoll (long long)?
tv.tv_sec = strtol (s, NULL, 10);
settimeofday (&tv, NULL);
}
size_t
timestamp_to_string (const char *name, uint8_t is_json, char *buf, size_t bsize)
{
struct timeval tv;
char *fmt = "%ld";
if (is_json) {
fmt = "\"%ld\"";
}
gettimeofday (&tv, NULL);
// FIXME: Platform doesn't seem to support long long printing
// We get empty string
return snprintf (buf, bsize, fmt, (long)tv.tv_sec);
}
GENERIC_RESOURCE
( timestamp
, METHOD_GET | METHOD_PUT
, "clock/timestamp"
, Time
, s
, timestamp_from_string
, timestamp_to_string
);
/*
* VI settings, see coding style
* ex:ts=8:et:sw=2
*/