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/* Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
Copyright (c) 2014 MariaDB Foundation
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "item_inetfunc.h"
longlong Item_func_inet_aton::val_int()
{
DBUG_ASSERT(fixed);
uint byte_result= 0;
ulonglong result= 0; // We are ready for 64 bit addresses
const char *p,* end;
char c= '.'; // we mark c to indicate invalid IP in case length is 0
int dot_count= 0;
StringBuffer<36> tmp;
String *s= args[0]->val_str_ascii(&tmp);
if (!s) // If null value
goto err;
null_value= 0;
end= (p = s->ptr()) + s->length();
while (p < end)
{
c= *p++;
int digit= (int) (c - '0');
if (digit >= 0 && digit <= 9)
{
if ((byte_result= byte_result * 10 + digit) > 255)
goto err; // Wrong address
}
else if (c == '.')
{
dot_count++;
result= (result << 8) + (ulonglong) byte_result;
byte_result= 0;
}
else
goto err; // Invalid character
}
if (c != '.') // IP number can't end on '.'
{
/*
Attempt to support short forms of IP-addresses. It's however pretty
basic one comparing to the BSD support.
Examples:
127 -> 0.0.0.127
127.255 -> 127.0.0.255
127.256 -> NULL (should have been 127.0.1.0)
127.2.1 -> 127.2.0.1
*/
switch (dot_count) {
case 1: result<<= 8; /* Fall through */
case 2: result<<= 8; /* Fall through */
}
return (result << 8) + (ulonglong) byte_result;
}
err:
null_value=1;
return 0;
}
///////////////////////////////////////////////////////////////////////////
String* Item_func_inet_ntoa::val_str(String* str)
{
DBUG_ASSERT(fixed);
ulonglong n= (ulonglong) args[0]->val_int();
/*
We do not know if args[0] is NULL until we have called
some val function on it if args[0] is not a constant!
Also return null if n > 255.255.255.255
*/
if ((null_value= (args[0]->null_value || n > 0xffffffff)))
return 0; // Null value
str->set_charset(collation.collation);
str->length(0);
uchar buf[8];
int4store(buf, n);
/* Now we can assume little endian. */
char num[4];
num[3]= '.';
for (uchar *p= buf + 4; p-- > buf;)
{
uint c= *p;
uint n1, n2; // Try to avoid divisions
n1= c / 100; // 100 digits
c-= n1 * 100;
n2= c / 10; // 10 digits
c-= n2 * 10; // last digit
num[0]= (char) n1 + '0';
num[1]= (char) n2 + '0';
num[2]= (char) c + '0';
uint length= (n1 ? 4 : n2 ? 3 : 2); // Remove pre-zero
uint dot_length= (p <= buf) ? 1 : 0;
(void) str->append(num + 4 - length, length - dot_length,
&my_charset_latin1);
}
return str;
}
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