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#include <stdio.h>
#include <strings.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <wchar.h>
#include "glk.h"
#include "glkterm.h"
/* This file is copied directly from the cheapglk package.
(Except that warning string constants are changed to L"..." constants.) */
#ifdef GLK_MODULE_DATETIME
/* Copy a POSIX tm structure to a glkdate. */
static void gli_date_from_tm(glkdate_t *date, struct tm *tm)
{
date->year = 1900 + tm->tm_year;
date->month = 1 + tm->tm_mon;
date->day = tm->tm_mday;
date->weekday = tm->tm_wday;
date->hour = tm->tm_hour;
date->minute = tm->tm_min;
date->second = tm->tm_sec;
}
/* Copy a glkdate to a POSIX tm structure.
This is used in the "glk_date_to_..." functions, which are supposed
to normalize the glkdate. We're going to rely on the mktime() /
timegm() functions to do that -- except they don't handle microseconds.
So we'll have to do that normalization here, adjust the tm_sec value,
and return the normalized number of microseconds.
*/
static glsi32 gli_date_to_tm(glkdate_t *date, struct tm *tm)
{
glsi32 microsec;
bzero(tm, sizeof(*tm));
tm->tm_year = date->year - 1900;
tm->tm_mon = date->month - 1;
tm->tm_mday = date->day;
tm->tm_wday = date->weekday;
tm->tm_hour = date->hour;
tm->tm_min = date->minute;
tm->tm_sec = date->second;
microsec = date->microsec;
if (microsec >= 1000000) {
tm->tm_sec += (microsec / 1000000);
microsec = microsec % 1000000;
}
else if (microsec < 0) {
microsec = -1 - microsec;
tm->tm_sec -= (1 + microsec / 1000000);
microsec = 999999 - (microsec % 1000000);
}
return microsec;
}
/* Convert a Unix timestamp, along with a microseconds value, to
a glktimeval.
*/
static void gli_timestamp_to_time(time_t timestamp, glsi32 microsec,
glktimeval_t *time)
{
if (sizeof(timestamp) <= 4) {
/* This platform has 32-bit time, but we can't do anything
about that. Hope it's not 2038 yet. */
if (timestamp >= 0)
time->high_sec = 0;
else
time->high_sec = -1;
time->low_sec = timestamp;
}
else {
/* The cast to int64_t shouldn't be necessary, but it
suppresses a pointless warning in the 32-bit case.
(Remember that we won't be executing this line in the
32-bit case.) */
time->high_sec = (((int64_t)timestamp) >> 32) & 0xFFFFFFFF;
time->low_sec = timestamp & 0xFFFFFFFF;
}
time->microsec = microsec;
}
/* Divide a Unix timestamp by a (positive) value. */
static glsi32 gli_simplify_time(time_t timestamp, glui32 factor)
{
/* We want to round towards negative infinity, which takes a little
bit of fussing. */
if (timestamp >= 0) {
return timestamp / (time_t)factor;
}
else {
return -1 - (((time_t)-1 - timestamp) / (time_t)factor);
}
}
void glk_current_time(glktimeval_t *time)
{
struct timeval tv;
if (gettimeofday(&tv, NULL)) {
gli_timestamp_to_time(0, 0, time);
gli_strict_warning(L"current_time: gettimeofday() failed.");
return;
}
gli_timestamp_to_time(tv.tv_sec, tv.tv_usec, time);
}
glsi32 glk_current_simple_time(glui32 factor)
{
struct timeval tv;
if (factor == 0) {
gli_strict_warning(L"current_simple_time: factor cannot be zero.");
return 0;
}
if (gettimeofday(&tv, NULL)) {
gli_strict_warning(L"current_simple_time: gettimeofday() failed.");
return 0;
}
return gli_simplify_time(tv.tv_sec, factor);
}
void glk_time_to_date_utc(glktimeval_t *time, glkdate_t *date)
{
time_t timestamp;
struct tm tm;
timestamp = time->low_sec;
if (sizeof(timestamp) > 4) {
timestamp += ((int64_t)time->high_sec << 32);
}
gmtime_r(×tamp, &tm);
gli_date_from_tm(date, &tm);
date->microsec = time->microsec;
}
void glk_time_to_date_local(glktimeval_t *time, glkdate_t *date)
{
time_t timestamp;
struct tm tm;
timestamp = time->low_sec;
if (sizeof(timestamp) > 4) {
timestamp += ((int64_t)time->high_sec << 32);
}
localtime_r(×tamp, &tm);
gli_date_from_tm(date, &tm);
date->microsec = time->microsec;
}
void glk_simple_time_to_date_utc(glsi32 time, glui32 factor,
glkdate_t *date)
{
time_t timestamp = (time_t)time * factor;
struct tm tm;
gmtime_r(×tamp, &tm);
gli_date_from_tm(date, &tm);
date->microsec = 0;
}
void glk_simple_time_to_date_local(glsi32 time, glui32 factor,
glkdate_t *date)
{
time_t timestamp = (time_t)time * factor;
struct tm tm;
localtime_r(×tamp, &tm);
gli_date_from_tm(date, &tm);
date->microsec = 0;
}
void glk_date_to_time_utc(glkdate_t *date, glktimeval_t *time)
{
time_t timestamp;
struct tm tm;
glsi32 microsec;
microsec = gli_date_to_tm(date, &tm);
/* The timegm function is not standard POSIX. If it's not available
on your platform, try setting the env var "TZ" to "", calling
mktime(), and then resetting "TZ". */
timestamp = timegm(&tm);
gli_timestamp_to_time(timestamp, microsec, time);
}
void glk_date_to_time_local(glkdate_t *date, glktimeval_t *time)
{
time_t timestamp;
struct tm tm;
glsi32 microsec;
microsec = gli_date_to_tm(date, &tm);
tm.tm_isdst = -1;
timestamp = mktime(&tm);
gli_timestamp_to_time(timestamp, microsec, time);
}
glsi32 glk_date_to_simple_time_utc(glkdate_t *date, glui32 factor)
{
time_t timestamp;
struct tm tm;
if (factor == 0) {
gli_strict_warning(L"date_to_simple_time_utc: factor cannot be zero.");
return 0;
}
gli_date_to_tm(date, &tm);
/* The timegm function is not standard POSIX. If it's not available
on your platform, try setting the env var "TZ" to "", calling
mktime(), and then resetting "TZ". */
timestamp = timegm(&tm);
return gli_simplify_time(timestamp, factor);
}
glsi32 glk_date_to_simple_time_local(glkdate_t *date, glui32 factor)
{
time_t timestamp;
struct tm tm;
if (factor == 0) {
gli_strict_warning(L"date_to_simple_time_local: factor cannot be zero.");
return 0;
}
gli_date_to_tm(date, &tm);
tm.tm_isdst = -1;
timestamp = mktime(&tm);
return gli_simplify_time(timestamp, factor);
}
#endif /* GLK_MODULE_DATETIME */
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