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


enum libcharconv_result
libcharconv_variation_selectors(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
{
	enum libcharconv_result ret = LIBCHARCONV_CONVERTED;
	uint_least32_t c;
	*n = 0;
	for (; slen--; s++) {
		if ('1' <= s[0] && s[0] <= '9') {
			c = (uint_least32_t)(s[0] - '0');
			if (!slen--)
				goto conv_if_end;
			if ('0' > s[1] || s[1] > '9')
				goto conv;
			c *= 10u;
			c += (uint_least32_t)(s[1] - '0');
			if (!slen--)
				goto conv_if_end;
			if ('0' > s[2] || s[2] > '9')
				goto conv;
			c *= 10u;
			c += (uint_least32_t)(s[2] - '0');
			if (c > 256u) {
				c /= 10u;
				goto conv;
			}
			goto conv;
		} else {
			*n += 1u;
			break;
		}
	}
no_conv:
	return LIBCHARCONV_NO_CONVERT;

conv_if_end:
	ret = LIBCHARCONV_CONVERT_IF_END;
conv:
	if (*n)
		goto no_conv;
	*n = c < 10u ? 1u : c < 100u ? 2u : 3u;
	if (c < 17u)
		c = UINT32_C(0xFE00) + (c - 1u);
	else
		c = UINT32_C(0xE0100) + (c - 17u);
	if (*ncp)
		*cp = c;
	*ncp = 1u;
	return ret;

}