Function convertStringCharsetIconv

src/convert.cpp:1411–1452

#if defined EXV_HAVE_ICONV
bool convertStringCharsetIconv(std::string& str, const char* from, const char* to) {
  if (strcmp(from, to) == 0)
    return true;  // nothing to do

  bool ret = true;
  auto cd = iconv_open(to, from);
  if (cd == iconv_t(-1)) {
#ifndef SUPPRESS_WARNINGS
    EXV_WARNING << "iconv_open: " << strError() << "\n";
#endif
    return false;
  }
  std::string outstr;
#ifdef WINICONV_CONST
  auto inptr = (WINICONV_CONST char*)(str.c_str());
#else
  auto inptr = (EXV_ICONV_CONST char*)(str.c_str());
#endif
  size_t inbytesleft = str.length();
  while (inbytesleft) {
    char outbuf[256];
    char* outptr = outbuf;
    size_t outbytesleft = sizeof(outbuf);
    size_t rc = iconv(cd, &inptr, &inbytesleft, &outptr, &outbytesleft);
    const size_t outbytesProduced = sizeof(outbuf) - outbytesleft;
    if (rc == std::numeric_limits<size_t>::max() && errno != E2BIG) {
#ifndef SUPPRESS_WARNINGS
      EXV_WARNING << "iconv: " << strError() << " inbytesleft = " << inbytesleft << "\n";
#endif
      ret = false;
      break;
    }
    outstr.append(std::string(outbuf, outbytesProduced));
  }

  if (cd)
    iconv_close(cd);

  if (ret)
    str = outstr;
  return ret;
}

#elif defined(_WIN32)
bool swapBytes(std::string& str) {