Function strconvert

sql/strfunc.cc:268–320

uint strconvert(CHARSET_INFO *from_cs, const char *from,
                CHARSET_INFO *to_cs, char *to, uint to_length, uint *errors)
{
  int cnvres;
  my_wc_t wc;
  char *to_start= to;
  uchar *to_end= (uchar*) to + to_length - 1;
  my_charset_conv_mb_wc mb_wc= from_cs->cset->mb_wc;
  my_charset_conv_wc_mb wc_mb= to_cs->cset->wc_mb;
  uint error_count= 0;

  while (1)
  {
    /*
      Using 'from + 10' is safe:
      - it is enough to scan a single character in any character set.
      - if remaining string is shorter than 10, then mb_wc will return
        with error because of unexpected '\0' character.
    */
    if ((cnvres= (*mb_wc)(from_cs, &wc,
                          (uchar*) from, (uchar*) from + 10)) > 0)
    {
      if (!wc)
        break;
      from+= cnvres;
    }
    else if (cnvres == MY_CS_ILSEQ)
    {
      error_count++;
      from++;
      wc= '?';
    }
    else
      break; // Impossible char.

outp:

    if ((cnvres= (*wc_mb)(to_cs, wc, (uchar*) to, to_end)) > 0)
      to+= cnvres;
    else if (cnvres == MY_CS_ILUNI && wc != '?')
    {
      error_count++;
      wc= '?';
      goto outp;
    }
    else
      break;
  }
  *to= '\0';
  *errors= error_count;
  return (uint32) (to - to_start);

}


/*