libcharconv_chess_neutral.c


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


enum libcharconv_result
libcharconv_chess_neutral(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 'k': case 'K': c = UINT32_C(0x1FA00); goto conv;
		case 'q': case 'Q': c = UINT32_C(0x1FA01); goto conv;
		case 'r': case 'R': c = UINT32_C(0x1FA02); goto conv;
		case 'b': case 'B': c = UINT32_C(0x1FA03); goto conv;
		case 'n': case 'N': c = UINT32_C(0x1FA04); goto conv;
		case 'p': case 'P': c = UINT32_C(0x1FA05); goto conv;
		case 'e': case 'E': c = UINT32_C(0x1FA4A); goto conv;
		default:
			*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;
}