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

#include "lib-common.h"
enum libcharconv_result
libcharconv_replacement(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
{
	uint_least32_t c;
	*n = 0;
	while (slen) {
		if (slen < 3u && !strncasecmp(s, "obj", slen)) {
			if (*n)
				goto no_conv;
			return LIBCHARCONV_INDETERMINATE;
		} else if (slen >= 3u && !strncasecmp(s, "obj", 3u)) {
			if (*n)
				goto no_conv;
			c = UINT32_C(0xFFFC);
			*n = 3u;
			goto conv;
		} else if (*s == '?') {
			if (*n)
				goto no_conv;
			c = UINT32_C(0xFFFD);
			*n = 1u;
			goto conv;
		} else {
			*n += 1u;
			s++;
			slen--;
		}
	}
no_conv:
	return LIBCHARCONV_NO_CONVERT;

conv:
	if (*ncp)
		*cp = c;
	*ncp = 1u;
	return LIBCHARCONV_CONVERTED;
}