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r10438: Move portability functions to lib/replace/; replace now simply ensures

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that a given set of (working) POSIX functions are available (without
prefixes to their names, etc). See lib/replace/README for a list.

Functions that behave different from their POSIX specification
(such as sys_select, sys_read, etc) have kept the sys_ prefix.
This commit is contained in:
Jelmer Vernooij
2005-09-23 00:38:22 +00:00
committed by Gerald (Jerry) Carter
parent f1688a8066
commit 29919a7105
22 changed files with 341 additions and 263 deletions
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34
source/lib/time.c
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@@ -594,3 +594,37 @@ NTTIME timeval_to_nttime(const struct timeval *tv)
return 10*(tv->tv_usec +
((TIME_FIXUP_CONSTANT + (uint64_t)tv->tv_sec) * 1000000));
}
/*******************************************************************
yield the difference between *A and *B, in seconds, ignoring leap seconds
********************************************************************/
static int tm_diff(struct tm *a, struct tm *b)
{
int ay = a->tm_year + (1900 - 1);
int by = b->tm_year + (1900 - 1);
int intervening_leap_days =
(ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400);
int years = ay - by;
int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday);
int hours = 24*days + (a->tm_hour - b->tm_hour);
int minutes = 60*hours + (a->tm_min - b->tm_min);
int seconds = 60*minutes + (a->tm_sec - b->tm_sec);
return seconds;
}
/*******************************************************************
return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
******************************************************************/
int get_time_zone(time_t t)
{
struct tm *tm = gmtime(&t);
struct tm tm_utc;
if (!tm)
return 0;
tm_utc = *tm;
tm = localtime(&t);
if (!tm)
return 0;
return tm_diff(&tm_utc,tm);
}