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/* _PDCLIB_is_leap( int )
This file is part of the Public Domain C Library (PDCLib).
Permission is granted to use, modify, and / or redistribute at will.
*/
#ifndef REGTEST
#include "pdclib/_PDCLIB_internal.h"
int _PDCLIB_is_leap( int year_offset )
{
/* year given as offset from 1900, matching tm.tm_year in <time.h> */
long long year = year_offset + 1900ll;
return ( ( year % 4 ) == 0 && ( ( year % 25 ) != 0 || ( year % 400 ) == 0 ) );
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
int main( void )
{
#ifndef REGTEST
/* 1901 not leap */
TESTCASE( ! _PDCLIB_is_leap( 1 ) );
/* 1904 leap */
TESTCASE( _PDCLIB_is_leap( 4 ) );
/* 1900 not leap */
TESTCASE( ! _PDCLIB_is_leap( 0 ) );
/* 2000 leap */
TESTCASE( _PDCLIB_is_leap( 100 ) );
#endif
return TEST_RESULTS;
}
#endif
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