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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA */
#include "my_handler.h"
int mi_compare_text(CHARSET_INFO *charset_info, uchar *a, uint a_length,
uchar *b, uint b_length, my_bool part_key)
{
if (part_key && b_length < a_length)
a_length=b_length;
return my_strnncoll(charset_info, a, a_length, b, b_length);
}
static int compare_bin(uchar *a, uint a_length, uchar *b, uint b_length,
my_bool part_key)
{
uint length= min(a_length,b_length);
uchar *end= a+ length;
int flag;
while (a < end)
if ((flag= (int) *a++ - (int) *b++))
return flag;
if (part_key && b_length < a_length)
return 0;
return (int) (a_length-b_length);
}
#define FCMP(A,B) ((int) (A) - (int) (B))
/*
Compare two keys
Returns <0, 0, >0 acording to which is bigger
Key_length specifies length of key to use. Number-keys can't be splited
If flag <> SEARCH_FIND compare also position
*/
int ha_key_cmp(register HA_KEYSEG *keyseg, register uchar *a,
register uchar *b, uint key_length, uint nextflag,
uint *diff_pos)
{
int flag;
int16 s_1,s_2;
int32 l_1,l_2;
uint32 u_1,u_2;
float f_1,f_2;
double d_1,d_2;
*diff_pos=0;
for ( ; (int) key_length >0 ; keyseg++)
{
uchar *end;
uint piks=! (keyseg->flag & HA_NO_SORT);
(*diff_pos)++;
/* Handle NULL part */
if (keyseg->null_bit)
{
key_length--;
if (*a != *b && piks)
{
flag = (int) *a - (int) *b;
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
}
b++;
if (!*a++) /* If key was NULL */
{
if (nextflag == (SEARCH_FIND | SEARCH_UPDATE))
nextflag=SEARCH_SAME; /* Allow duplicate keys */
continue; /* To next key part */
}
}
end= a+ min(keyseg->length,key_length);
switch ((enum ha_base_keytype) keyseg->type) {
case HA_KEYTYPE_TEXT: /* Ascii; Key is converted */
if (keyseg->flag & HA_SPACE_PACK)
{
int a_length,b_length,pack_length;
get_key_length(a_length,a);
get_key_pack_length(b_length,pack_length,b);
key_length-= b_length + pack_length;
if (piks &&
(flag= mi_compare_text(keyseg->charset,a,a_length,b,b_length,
(my_bool) ((nextflag & SEARCH_PREFIX) &&
key_length <= 0))))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a+=a_length;
b+=b_length;
break;
}
else
{
uint length=(uint) (end-a), a_length=length, b_length=length;
key_length-= keyseg->length;
if (!(nextflag & SEARCH_PREFIX))
{
while (a_length && a[a_length-1] == ' ')
a_length--;
while (b_length && b[b_length-1] == ' ')
b_length--;
}
if (piks &&
(flag= mi_compare_text(keyseg->charset,a,a_length,b,b_length,
(my_bool) ((nextflag & SEARCH_PREFIX) &&
key_length <= 0))))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a=end;
b+=length;
}
break;
case HA_KEYTYPE_BINARY:
if (keyseg->flag & HA_SPACE_PACK)
{
int a_length,b_length,pack_length;
get_key_length(a_length,a);
get_key_pack_length(b_length,pack_length,b);
key_length-= b_length + pack_length;
if (piks &&
(flag=compare_bin(a,a_length,b,b_length,
(my_bool) ((nextflag & SEARCH_PREFIX) &&
key_length <= 0))))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a+=a_length;
b+=b_length;
break;
}
else
{
uint length=keyseg->length;
key_length-= keyseg->length;
if (piks &&
(flag=compare_bin(a,length,b,length,
(my_bool) ((nextflag & SEARCH_PREFIX) &&
key_length <= 0))))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a+=length;
b+=length;
}
break;
case HA_KEYTYPE_VARTEXT:
{
int a_length,b_length,pack_length;
get_key_length(a_length,a);
get_key_pack_length(b_length,pack_length,b);
key_length-= b_length + pack_length;
if (piks &&
(flag= mi_compare_text(keyseg->charset,a,a_length,b,b_length,
(my_bool) ((nextflag & SEARCH_PREFIX) &&
key_length <= 0))))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a+=a_length;
b+=b_length;
break;
}
break;
case HA_KEYTYPE_VARBINARY:
{
int a_length,b_length,pack_length;
get_key_length(a_length,a);
get_key_pack_length(b_length,pack_length,b);
key_length-= b_length + pack_length;
if (piks &&
(flag=compare_bin(a,a_length,b,b_length,
(my_bool) ((nextflag & SEARCH_PREFIX) &&
key_length <= 0))))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a+=a_length;
b+=b_length;
break;
}
break;
case HA_KEYTYPE_INT8:
{
int i_1= (int) *((signed char*) a);
int i_2= (int) *((signed char*) b);
if (piks && (flag = CMP_NUM(i_1,i_2)))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a= end;
b++;
key_length-= keyseg->length;
break;
}
case HA_KEYTYPE_SHORT_INT:
s_1= mi_sint2korr(a);
s_2= mi_sint2korr(b);
if (piks && (flag = CMP_NUM(s_1,s_2)))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a= end;
b+= 2; /* sizeof(short int); */
key_length-= keyseg->length;
break;
case HA_KEYTYPE_USHORT_INT:
{
uint16 us_1,us_2;
us_1= mi_sint2korr(a);
us_2= mi_sint2korr(b);
if (piks && (flag = CMP_NUM(us_1,us_2)))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a= end;
b+=2; /* sizeof(short int); */
key_length-= keyseg->length;
break;
}
case HA_KEYTYPE_LONG_INT:
l_1= mi_sint4korr(a);
l_2= mi_sint4korr(b);
if (piks && (flag = CMP_NUM(l_1,l_2)))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a= end;
b+= 4; /* sizeof(long int); */
key_length-= keyseg->length;
break;
case HA_KEYTYPE_ULONG_INT:
u_1= mi_sint4korr(a);
u_2= mi_sint4korr(b);
if (piks && (flag = CMP_NUM(u_1,u_2)))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a= end;
b+= 4; /* sizeof(long int); */
key_length-= keyseg->length;
break;
case HA_KEYTYPE_INT24:
l_1=mi_sint3korr(a);
l_2=mi_sint3korr(b);
if (piks && (flag = CMP_NUM(l_1,l_2)))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a= end;
b+= 3;
key_length-= keyseg->length;
break;
case HA_KEYTYPE_UINT24:
l_1=mi_uint3korr(a);
l_2=mi_uint3korr(b);
if (piks && (flag = CMP_NUM(l_1,l_2)))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a= end;
b+= 3;
key_length-= keyseg->length;
break;
case HA_KEYTYPE_FLOAT:
mi_float4get(f_1,a);
mi_float4get(f_2,b);
if (piks && (flag = CMP_NUM(f_1,f_2)))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a= end;
b+= 4; /* sizeof(float); */
key_length-= keyseg->length;
break;
case HA_KEYTYPE_DOUBLE:
mi_float8get(d_1,a);
mi_float8get(d_2,b);
if (piks && (flag = CMP_NUM(d_1,d_2)))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a= end;
b+= 8; /* sizeof(double); */
key_length-= keyseg->length;
break;
case HA_KEYTYPE_NUM: /* Numeric key */
{
int swap_flag= 0;
int alength,blength;
if (keyseg->flag & HA_REVERSE_SORT)
{
swap(uchar*,a,b);
swap_flag=1; /* Remember swap of a & b */
end= a+ (int) (end-b);
}
if (keyseg->flag & HA_SPACE_PACK)
{
alength= *a++; blength= *b++;
end=a+alength;
key_length-= blength + 1;
}
else
{
alength= (int) (end-a);
blength=keyseg->length;
/* remove pre space from keys */
for ( ; alength && *a == ' ' ; a++, alength--) ;
for ( ; blength && *b == ' ' ; b++, blength--) ;
key_length-= keyseg->length;
}
if (piks)
{
if (*a == '-')
{
if (*b != '-')
return -1;
a++; b++;
swap(uchar*,a,b);
swap(int,alength,blength);
swap_flag=1-swap_flag;
alength--; blength--;
end=a+alength;
}
else if (*b == '-')
return 1;
while (alength && (*a == '+' || *a == '0'))
{
a++; alength--;
}
while (blength && (*b == '+' || *b == '0'))
{
b++; blength--;
}
if (alength != blength)
return (alength < blength) ? -1 : 1;
while (a < end)
if (*a++ != *b++)
return ((int) a[-1] - (int) b[-1]);
}
else
{
b+=(end-a);
a=end;
}
if (swap_flag) /* Restore pointers */
swap(uchar*,a,b);
break;
}
#ifdef HAVE_LONG_LONG
case HA_KEYTYPE_LONGLONG:
{
longlong ll_a,ll_b;
ll_a= mi_sint8korr(a);
ll_b= mi_sint8korr(b);
if (piks && (flag = CMP_NUM(ll_a,ll_b)))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a= end;
b+= 8;
key_length-= keyseg->length;
break;
}
case HA_KEYTYPE_ULONGLONG:
{
ulonglong ll_a,ll_b;
ll_a= mi_uint8korr(a);
ll_b= mi_uint8korr(b);
if (piks && (flag = CMP_NUM(ll_a,ll_b)))
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag);
a= end;
b+= 8;
key_length-= keyseg->length;
break;
}
#endif
case HA_KEYTYPE_END: /* Ready */
goto end; /* diff_pos is incremented */
}
}
(*diff_pos)++;
end:
if (!(nextflag & SEARCH_FIND))
{
uint i;
if (nextflag & (SEARCH_NO_FIND | SEARCH_LAST)) /* Find record after key */
return (nextflag & (SEARCH_BIGGER | SEARCH_LAST)) ? -1 : 1;
flag=0;
for (i=keyseg->length ; i-- > 0 ; )
{
if (*a++ != *b++)
{
flag= FCMP(a[-1],b[-1]);
break;
}
}
if (nextflag & SEARCH_SAME)
return (flag); /* read same */
if (nextflag & SEARCH_BIGGER)
return (flag <= 0 ? -1 : 1); /* read next */
return (flag < 0 ? -1 : 1); /* read previous */
}
return 0;
} /* ha_key_cmp */
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