mod_gsmopen/win_iconv/iconv.h

#include <stddef.h>
typedef void* iconv_t;
iconv_t iconv_open(const char *tocode, const char *fromcode);
int iconv_close(iconv_t cd);
size_t iconv(iconv_t cd, const char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft);