#include <iconv.h>
#include <stdio.h>
int main ()
{
  char output[64];

#ifdef _LIBICONV_VERSION
  printf ("_LIBICONV_VERSION = 0x%x\n", _LIBICONV_VERSION);
#else
  printf ("_LIBICONV_VERSION is not defined.\n");
#endif

  iconv_t cd = iconv_open ("ISO-8859-1", "ISO-8859-15");

  /* no conversion needed */
  {
    char input[6] = "Oeuvre";
    char *inbuf = input;
    size_t inbytesleft = sizeof (input);
    char *outbuf = output;
    size_t outbytesleft = sizeof (output);
    size_t ret = iconv (cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
    printf ("no conversion needed: ret=%d, input consumed: %d/%d, output produced: %d/%d\n",
            (int) ret,
            (int) (inbuf - input), (int) (sizeof (input) - inbytesleft),
            (int) (outbuf - output), (int) (sizeof (output) - outbytesleft));
  }

  /* entire string */
  {
    char input[5] = "\xBCuvre";
    char *inbuf = input;
    size_t inbytesleft = sizeof (input);
    char *outbuf = output;
    size_t outbytesleft = sizeof (output);
    size_t ret = iconv (cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
    printf ("entire string: ret=%d, input consumed: %d/%d, output produced: %d/%d\n",
            (int) ret,
            (int) (inbuf - input), (int) (sizeof (input) - inbytesleft),
            (int) (outbuf - output), (int) (sizeof (output) - outbytesleft));
  }

  /* carefully */
  {
    char input[5] = "\xBCuvre";
    char *inbuf = input;
    size_t inbytesleft = 1;
    char *outbuf = output;
    size_t outbytesleft = sizeof (output);
    size_t ret = iconv (cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
    printf ("carefully: ret=%d, input consumed: %d/%d, output produced: %d/%d\n",
            (int) ret,
            (int) (inbuf - input), (int) (1 - inbytesleft),
            (int) (outbuf - output), (int) (sizeof (output) - outbytesleft));
  }
}
/*
glibc, mingw:
_LIBICONV_VERSION is not defined.
no conversion needed: ret=0, input consumed: 6/6, output produced: 6/6
entire string: ret=-1, input consumed: 0/0, output produced: 0/0
carefully: ret=-1, input consumed: 0/0, output produced: 0/0

platform with libiconv:
_LIBICONV_VERSION = 0x111
no conversion needed: ret=0, input consumed: 6/6, output produced: 6/6
entire string: ret=-1, input consumed: 0/0, output produced: 0/0
carefully: ret=-1, input consumed: 0/0, output produced: 0/0
*/