컴파일은 안 해봤지만, 아마도 큰 문제는 없을 것임.....^^
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iconv.h>
#include <errno.h>

static iconv_t conv_desc; 

char utf8buf[2048];

char* euckr_to_utf8( const char* str, int in_strlen, int out_strlen )
{
    char *outbuf;
    int err;
   
    memset(utf8buf, 0x00, sizeof(utf8buf) );
    outbuf = utf8buf;

    err = iconv( cd, (char**)&str, &in_strlen, &outbuf, &out_strlen );
    if( err < 0 )
    {
     printf("iconv errorn");
     return NULL;
    }

    return outbuf;
}

int main(void)
{
 char *ghc = "바보";
 char *utf8;
 
 int inlen;
 
    conv_desc = iconv_open( "UTF-8", "EUC-KR" );
    if( conv_desc < 0)
    {
     printf ("iconv_open failed!n");
    }
   
    inlen = strlen(ghc);
   
    utf8 = euckr_to_utf8(ghc, inlen, inlen*2 );
    if( utf8 == NULL )
    {
     printf("euckr_to_utf8 errorn");
     return -1;
    }

 printf("utf8 = %sn", utf8);
   
    iconv_close( conv_desc );
   
    return -1;
}