#include <iconv.h>

#include <string>

int convert(string input, wstring &output)
{
	char *inbuf, *iptr, *outbuf, *wptr;
	iconv_t cd;
	size_t nconv, inlen, avail;

	cd =  iconv_open("UCS-4-INTERNAL", "UTF-8");
	if (cd == (iconv_t)-1)
	{
		perror("iconv error");
		return -1;
	}

	iptr = inbuf = strdup(input.c_str());
	inlen = input.size();
	avail = inlen * 4 + 1;
	wptr = outbuf = (char*)calloc(avail * sizeof(char), 1);

	nconv = iconv(cd, &iptr, &inlen, &wptr, &avail);
	if (nconv == (size_t)-1)
	{
		perror("iconv error");
		free(inbuf);
		free(outbuf);
		return -1;
	}

	iconv(cd, NULL, NULL, &wptr, &avail);

	if (avail >= sizeof(char))
	{
		*wptr = '\0';
	}
	else
	{
		perror("iconv error");
		free(inbuf);
		free(outbuf);
		return -1;
	}

	if (iconv_close(cd) != 0)
	{
		perror("iconv error");
		free(inbuf);
		free(outbuf);
		return -1;
	}

	wchar_t *wstr = reinterpret_cast<wchar_t*>(outbuf);
	output = wstring(wstr);
	free(outbuf);

	return 1;
}