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MySQL 5.1: Item_func_inet_ntoa Class Reference

Item_func_inet_ntoa Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_inet_ntoa:

[legend]Collaboration diagram for Item_func_inet_ntoa:

[legend]List of all members.


Public Member Functions
	Item_func_inet_ntoa (Item *a)
String *	val_str (String *str)
const char *	func_name () const
void	fix_length_and_dec ()
bool	check_partition_func_processor (byte *bool_arg)

Detailed Description

Definition at line 670 of file item_strfunc.h.

Constructor & Destructor Documentation

Item_func_inet_ntoa::Item_func_inet_ntoa ( Item * a ) [inline]

Definition at line 673 of file item_strfunc.h.

00673                                :Item_str_func(a)
00674     {
00675     }

Member Function Documentation

bool Item_func_inet_ntoa::check_partition_func_processor ( byte * bool_arg ) [inline, virtual]

Reimplemented from Item.

Definition at line 679 of file item_strfunc.h.

00679 { return 0;}

void Item_func_inet_ntoa::fix_length_and_dec ( ) [inline, virtual]

Implements Item_result_field.

Definition at line 678 of file item_strfunc.h.

References Item::decimals, and Item::max_length.

00678 { decimals = 0; max_length=3*8+7; }

const char* Item_func_inet_ntoa::func_name ( ) const [inline, virtual]

Implements Item_func.

Definition at line 677 of file item_strfunc.h.

00677 { return "inet_ntoa"; }

String * Item_func_inet_ntoa::val_str ( String * str ) [virtual]

Implements Item.

Definition at line 2733 of file item_strfunc.cc.

References String::append(), Item_func::args, buf, DBUG_ASSERT, Item::fixed, int4store, String::length(), LL, n, Item::null_value, p, and Item_str_func::val_int().

02734 {
02735   DBUG_ASSERT(fixed == 1);
02736   uchar buf[8], *p;
02737   ulonglong n = (ulonglong) args[0]->val_int();
02738   char num[4];
02739 
02740   /*
02741     We do not know if args[0] is NULL until we have called
02742     some val function on it if args[0] is not a constant!
02743 
02744     Also return null if n > 255.255.255.255
02745   */
02746   if ((null_value= (args[0]->null_value || n > (ulonglong) LL(4294967295))))
02747     return 0;                                   // Null value
02748 
02749   str->length(0);
02750   int4store(buf,n);
02751 
02752   /* Now we can assume little endian. */
02753 
02754   num[3]='.';
02755   for (p=buf+4 ; p-- > buf ; )
02756   {
02757     uint c = *p;
02758     uint n1,n2;                                 // Try to avoid divisions
02759     n1= c / 100;                                // 100 digits
02760     c-= n1*100;
02761     n2= c / 10;                                 // 10 digits
02762     c-=n2*10;                                   // last digit
02763     num[0]=(char) n1+'0';
02764     num[1]=(char) n2+'0';
02765     num[2]=(char) c+'0';
02766     uint length=(n1 ? 4 : n2 ? 3 : 2);          // Remove pre-zero
02767 
02768     (void) str->append(num+4-length,length);
02769   }
02770   str->length(str->length()-1);                 // Remove last '.';
02771   return str;
02772 }

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The documentation for this class was generated from the following files:

mysql/src/5.1-dbg/sql/item_strfunc.h
mysql/src/5.1-dbg/sql/item_strfunc.cc

Generated on Sat Sep 9 21:33:52 2006 for MySQL 5.1 by

1.4.7

The world's most popular open source database

Item_func_inet_ntoa Class Reference

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation