/* See LICENSE file for copyright and license details. */
#include "common.h"


const char *
libpatch_parse_timestamp(const char *text, struct tm *time_out, const char **frac_out,
                         int *has_zone_out, enum libpatch_style style)
{
	const char *fmt, *r;
	struct tm zone;

	if (style == LIBPATCH_STYLE_COPIED) {
		fmt = "%a %b %e %T %Y";
	} else if (style == LIBPATCH_STYLE_UNIFIED) {
		fmt = "%Y-%m-%d %H:%M:%S";
	} else {
		errno = EINVAL;
		return NULL;
	}

	text = strptime(text, fmt, time_out);
	if (!text)
		return NULL;

	if (text[0] == '.') {
		*frac_out = ++text;
		while (isdigit(*text))
			text++;
	} else {
		*frac_out = NULL;
	}

	time_out->tm_isdst = -1;
	time_out->tm_zone = NULL;

	r = strptime(text, " %z", &zone);
	if (r) {
		text = r;
		*has_zone_out = 1;
		time_out->tm_gmtoff = zone.tm_gmtoff;
	} else {
		*has_zone_out = 0;
		time_out->tm_gmtoff = 0;
	}

	return text;
}