Function append_query_string

sql/item.cc:1940–1979

*/

int
append_query_string(THD *thd, const CHARSET_INFO *csinfo,
                    String const *from, String *to)
{
    char *beg, *ptr;
    uint32 const orig_len= to->length();
    if (to->reserve(orig_len + from->length()*2+3))
        return 1;

    beg= to->c_ptr_quick() + to->length();
    ptr= beg;
    if (csinfo->escape_with_backslash_is_dangerous)
        ptr= str_to_hex(ptr, from->ptr(), from->length());
    else
    {
        *ptr++= '\'';
        if (!(thd->variables.sql_mode & MODE_NO_BACKSLASH_ESCAPES))
        {
            ptr+= escape_string_for_mysql(csinfo, ptr, 0,
                                          from->ptr(), from->length());
        }
        else
        {
            const char *frm_str= from->ptr();

            for (; frm_str < (from->ptr() + from->length()); frm_str++)
            {
                /* Using '' way to represent "'" */
                if (*frm_str == '\'')
                    *ptr++= *frm_str;

                *ptr++= *frm_str;
            }
        }

        *ptr++= '\'';
    }
    to->length(orig_len + ptr - beg);
    return 0;
}
#endif