#include <stdio.h>
#include <stdlib.h>
#include <iconv.h>

int main(int argc, char *argv[])
{
    char src[] = "abcčde";
    char dst[100];
    size_t srclen = 6;
    size_t dstlen = 12;

    fprintf(stderr,"in: %s\n",src);

    char * pIn = src;
    char * pOut = ( char*)dst;

    iconv_t conv = iconv_open("UTF-8","CP1250");
    iconv(conv, &pIn, &srclen, &pOut, &dstlen);
    iconv_close(conv);

    fprintf(stderr,"out: %s\n",dst);
}