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


static struct {
#ifndef REVERSED
# define FUNC_NAME libcharconv_rotated_45deg_cw
	uint_least32_t from;
	uint_least32_t to;
#else
# define FUNC_NAME libcharconv_rotated_45deg_ccw
	uint_least32_t to;
	uint_least32_t from;
#endif
} pairs[] = {
	CYCLE_8(0x1FA04, 0x1FA08, 0x1FA19, 0x1FA1D, 0x1FA2E, 0x1FA32, 0x1FA43, 0x1FA47),
	CYCLE_8(0x02658, 0x1FA06, 0x1FA0D, 0x1FA1B, 0x1FA22, 0x1FA30, 0x1FA37, 0x1FA45),
	CYCLE_8(0x0265E, 0x1FA07, 0x1FA13, 0x1FA1C, 0x1FA28, 0x1FA31, 0x1FA3D, 0x1FA46),
	CYCLE_2(0x2E2C, 0x2058),
	CYCLE_2(0x203B, 0x205C)
};


enum libcharconv_result
FUNC_NAME(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
{
	uint_least32_t c;
	size_t i, clen;
	*n = 0;
	while (slen) {
		clen = libcharconv_decode_utf8_(s, slen, &c);
		if (clen > slen) {
			if (*n)
				goto no_conv;
			return LIBCHARCONV_INDETERMINATE;
		}
		if (!clen) {
			*n += 1u;
			slen -= 1u;
			s = &s[1];
			continue;
		}

		for (i = 0u; i < sizeof(pairs) / sizeof(*pairs); i++) {
			if (c == pairs[i].from) {
				c = pairs[i].to;
				goto conv;
			}
		}

		*n += clen;
		s = &s[clen];
		slen -= clen;
	}
no_conv:
	return LIBCHARCONV_NO_CONVERT;

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