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deps/libgit2/src/util/date.c  view on Meta::CPAN

	if (year < 0 || year > 129) /* algo only works for 1970-2099 */
		return -1;
	if (month < 0 || month > 11) /* array bounds */
		return -1;
	if (month < 2 || (year + 2) % 4)
		day--;
	if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_sec < 0)
		return -1;
	return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL +
		tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec;
}

static const char *month_names[] = {
	"January", "February", "March", "April", "May", "June",
	"July", "August", "September", "October", "November", "December"
};

static const char *weekday_names[] = {
	"Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays"
};



/*
 * Check these. And note how it doesn't do the summer-time conversion.
 *
 * In my world, it's always summer, and things are probably a bit off
 * in other ways too.
 */
static const struct {
	const char *name;
	int offset;
	int dst;
} timezone_names[] = {
	{ "IDLW", -12, 0, },	/* International Date Line West */
	{ "NT",   -11, 0, },	/* Nome */
	{ "CAT",  -10, 0, },	/* Central Alaska */
	{ "HST",  -10, 0, },	/* Hawaii Standard */
	{ "HDT",  -10, 1, },	/* Hawaii Daylight */
	{ "YST",   -9, 0, },	/* Yukon Standard */
	{ "YDT",   -9, 1, },	/* Yukon Daylight */
	{ "PST",   -8, 0, },	/* Pacific Standard */
	{ "PDT",   -8, 1, },	/* Pacific Daylight */
	{ "MST",   -7, 0, },	/* Mountain Standard */
	{ "MDT",   -7, 1, },	/* Mountain Daylight */
	{ "CST",   -6, 0, },	/* Central Standard */
	{ "CDT",   -6, 1, },	/* Central Daylight */
	{ "EST",   -5, 0, },	/* Eastern Standard */
	{ "EDT",   -5, 1, },	/* Eastern Daylight */
	{ "AST",   -3, 0, },	/* Atlantic Standard */
	{ "ADT",   -3, 1, },	/* Atlantic Daylight */
	{ "WAT",   -1, 0, },	/* West Africa */

	{ "GMT",    0, 0, },	/* Greenwich Mean */
	{ "UTC",    0, 0, },	/* Universal (Coordinated) */
	{ "Z",      0, 0, },    /* Zulu, alias for UTC */

	{ "WET",    0, 0, },	/* Western European */
	{ "BST",    0, 1, },	/* British Summer */
	{ "CET",   +1, 0, },	/* Central European */
	{ "MET",   +1, 0, },	/* Middle European */
	{ "MEWT",  +1, 0, },	/* Middle European Winter */
	{ "MEST",  +1, 1, },	/* Middle European Summer */
	{ "CEST",  +1, 1, },	/* Central European Summer */
	{ "MESZ",  +1, 1, },	/* Middle European Summer */
	{ "FWT",   +1, 0, },	/* French Winter */
	{ "FST",   +1, 1, },	/* French Summer */
	{ "EET",   +2, 0, },	/* Eastern Europe */
	{ "EEST",  +2, 1, },	/* Eastern European Daylight */
	{ "WAST",  +7, 0, },	/* West Australian Standard */
	{ "WADT",  +7, 1, },	/* West Australian Daylight */
	{ "CCT",   +8, 0, },	/* China Coast */
	{ "JST",   +9, 0, },	/* Japan Standard */
	{ "EAST", +10, 0, },	/* Eastern Australian Standard */
	{ "EADT", +10, 1, },	/* Eastern Australian Daylight */
	{ "GST",  +10, 0, },	/* Guam Standard */
	{ "NZT",  +12, 0, },	/* New Zealand */
	{ "NZST", +12, 0, },	/* New Zealand Standard */
	{ "NZDT", +12, 1, },	/* New Zealand Daylight */
	{ "IDLE", +12, 0, },	/* International Date Line East */
};

static size_t match_string(const char *date, const char *str)
{
	size_t i = 0;

	for (i = 0; *date; date++, str++, i++) {
		if (*date == *str)
			continue;
		if (toupper(*date) == toupper(*str))
			continue;
		if (!isalnum(*date))
			break;
		return 0;
	}
	return i;
}

static int skip_alpha(const char *date)
{
	int i = 0;
	do {
		i++;
	} while (isalpha(date[i]));
	return i;
}

/*
* Parse month, weekday, or timezone name
*/
static size_t match_alpha(const char *date, struct tm *tm, int *offset)
{
	unsigned int i;

	for (i = 0; i < 12; i++) {
		size_t match = match_string(date, month_names[i]);
		if (match >= 3) {
			tm->tm_mon = i;
			return match;
		}