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


enum libcharconv_result
libcharconv_metrical(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
{
	uint_least32_t c;
	*n = 0;
	for (; slen--; s++) {
		switch (*s) {
		case '1': c = UINT32_C(0x23D1); goto conv;
		case '2': c = UINT32_C(0x23D6); goto conv;
		case '3': c = UINT32_C(0x23D7); goto conv;
		case '4': c = UINT32_C(0x23D8); goto conv;
		case '5': c = UINT32_C(0x23D9); goto conv;
		case '-':
		case '_':
			if (!slen)
				return LIBCHARCONV_INDETERMINATE;
			if (s[1] != '1' && s[1] != '2')
				goto no_match;
			c = UINT32_C(0x23D2) + (s[0] == '_' ? 1u : 0u) + (s[1] == '2' ? 2u : 0u);
			goto conv2;
		default:
		no_match:
			*n += 1u;
			break;
		}
	}
no_conv:
	return LIBCHARCONV_NO_CONVERT;

conv:
	if (*n)
		goto no_conv;
	if (*ncp)
		*cp = c;
	*n += 1u;
	*ncp = 1u;
	return LIBCHARCONV_CONVERTED;

conv2:
	if (*n)
		goto no_conv;
	if (*ncp)
		*cp = c;
	*n += 2u;
	*ncp = 1u;
	return LIBCHARCONV_CONVERTED;
}