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by brian
clean slate |
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/* Copyright (C) 2002-2006 MySQL AB
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; version 2
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of the License.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA */
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#include <my_global.h> |
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#include <m_ctype.h> |
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#include <my_base.h> |
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#include <my_handler.h> |
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#include <my_sys.h> |
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#include "my_handler_errors.h" |
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int ha_compare_text(CHARSET_INFO *charset_info, uchar *a, uint a_length, |
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uchar *b, uint b_length, my_bool part_key, |
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my_bool skip_end_space) |
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{
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if (!part_key) |
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return charset_info->coll->strnncollsp(charset_info, a, a_length, |
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b, b_length, (my_bool)!skip_end_space); |
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return charset_info->coll->strnncoll(charset_info, a, a_length, |
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b, b_length, part_key); |
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}
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static int compare_bin(uchar *a, uint a_length, uchar *b, uint b_length, |
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my_bool part_key, my_bool skip_end_space) |
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{
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uint length= min(a_length,b_length); |
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uchar *end= a+ length; |
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int flag; |
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while (a < end) |
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if ((flag= (int) *a++ - (int) *b++)) |
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return flag; |
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if (part_key && b_length < a_length) |
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return 0; |
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if (skip_end_space && a_length != b_length) |
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{
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int swap= 1; |
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/*
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We are using space compression. We have to check if longer key
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has next character < ' ', in which case it's less than the shorter
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key that has an implicite space afterwards.
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This code is identical to the one in
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strings/ctype-simple.c:my_strnncollsp_simple
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*/
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if (a_length < b_length) |
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{
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/* put shorter key in a */
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a_length= b_length; |
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a= b; |
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swap= -1; /* swap sign of result */ |
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}
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for (end= a + a_length-length; a < end ; a++) |
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{
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if (*a != ' ') |
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return (*a < ' ') ? -swap : swap; |
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}
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return 0; |
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}
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return (int) (a_length-b_length); |
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}
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/*
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Compare two keys
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SYNOPSIS
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ha_key_cmp()
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keyseg Array of key segments of key to compare
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a First key to compare, in format from _mi_pack_key()
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This is normally key specified by user
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b Second key to compare. This is always from a row
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key_length Length of key to compare. This can be shorter than
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a to just compare sub keys
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next_flag How keys should be compared
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If bit SEARCH_FIND is not set the keys includes the row
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position and this should also be compared
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diff_pos OUT Number of first keypart where values differ, counting
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from one.
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diff_pos[1] OUT (b + diff_pos[1]) points to first value in tuple b
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that is different from corresponding value in tuple a.
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EXAMPLES
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Example1: if the function is called for tuples
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('aaa','bbb') and ('eee','fff'), then
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diff_pos[0] = 1 (as 'aaa' != 'eee')
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diff_pos[1] = 0 (offset from beggining of tuple b to 'eee' keypart).
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Example2: if the index function is called for tuples
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('aaa','bbb') and ('aaa','fff'),
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diff_pos[0] = 2 (as 'aaa' != 'eee')
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diff_pos[1] = 3 (offset from beggining of tuple b to 'fff' keypart,
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here we assume that first key part is CHAR(3) NOT NULL)
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NOTES
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Number-keys can't be splited
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RETURN VALUES
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<0 If a < b
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0 If a == b
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>0 If a > b
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*/
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#define FCMP(A,B) ((int) (A) - (int) (B))
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int ha_key_cmp(register HA_KEYSEG *keyseg, register uchar *a, |
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register uchar *b, uint key_length, uint nextflag, |
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uint *diff_pos) |
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{
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int flag; |
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int16 s_1,s_2; |
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int32 l_1,l_2; |
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uint32 u_1,u_2; |
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float f_1,f_2; |
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double d_1,d_2; |
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uint next_key_length; |
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uchar *orig_b= b; |
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*diff_pos=0; |
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for ( ; (int) key_length >0 ; key_length=next_key_length, keyseg++) |
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{
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uchar *end; |
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uint piks=! (keyseg->flag & HA_NO_SORT); |
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(*diff_pos)++; |
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diff_pos[1]= (uint)(b - orig_b); |
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/* Handle NULL part */
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if (keyseg->null_bit) |
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{
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key_length--; |
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if (*a != *b && piks) |
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{
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flag = (int) *a - (int) *b; |
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return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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}
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b++; |
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if (!*a++) /* If key was NULL */ |
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{
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if (nextflag == (SEARCH_FIND | SEARCH_UPDATE)) |
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nextflag=SEARCH_SAME; /* Allow duplicate keys */ |
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else if (nextflag & SEARCH_NULL_ARE_NOT_EQUAL) |
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{
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/*
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This is only used from mi_check() to calculate cardinality.
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It can't be used when searching for a key as this would cause
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compare of (a,b) and (b,a) to return the same value.
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*/
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return -1; |
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}
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next_key_length=key_length; |
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continue; /* To next key part */ |
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}
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}
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end= a+ min(keyseg->length,key_length); |
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next_key_length=key_length-keyseg->length; |
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switch ((enum ha_base_keytype) keyseg->type) { |
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case HA_KEYTYPE_TEXT: /* Ascii; Key is converted */ |
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if (keyseg->flag & HA_SPACE_PACK) |
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{
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int a_length,b_length,pack_length; |
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get_key_length(a_length,a); |
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get_key_pack_length(b_length,pack_length,b); |
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next_key_length=key_length-b_length-pack_length; |
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if (piks && |
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(flag=ha_compare_text(keyseg->charset,a,a_length,b,b_length, |
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(my_bool) ((nextflag & SEARCH_PREFIX) && |
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next_key_length <= 0), |
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(my_bool)!(nextflag & SEARCH_PREFIX)))) |
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return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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a+=a_length; |
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b+=b_length; |
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break; |
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}
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else
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{
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uint length=(uint) (end-a), a_length=length, b_length=length; |
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if (piks && |
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(flag= ha_compare_text(keyseg->charset, a, a_length, b, b_length, |
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(my_bool) ((nextflag & SEARCH_PREFIX) && |
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next_key_length <= 0), |
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(my_bool)!(nextflag & SEARCH_PREFIX)))) |
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return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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a=end; |
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b+=length; |
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}
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break; |
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case HA_KEYTYPE_BINARY: |
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case HA_KEYTYPE_BIT: |
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if (keyseg->flag & HA_SPACE_PACK) |
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{
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int a_length,b_length,pack_length; |
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get_key_length(a_length,a); |
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get_key_pack_length(b_length,pack_length,b); |
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next_key_length=key_length-b_length-pack_length; |
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if (piks && |
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(flag=compare_bin(a,a_length,b,b_length, |
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(my_bool) ((nextflag & SEARCH_PREFIX) && |
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next_key_length <= 0),1))) |
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return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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a+=a_length; |
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b+=b_length; |
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break; |
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}
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else
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{
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uint length=keyseg->length; |
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if (piks && |
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(flag=compare_bin(a,length,b,length, |
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(my_bool) ((nextflag & SEARCH_PREFIX) && |
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next_key_length <= 0),0))) |
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return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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a+=length; |
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b+=length; |
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}
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break; |
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case HA_KEYTYPE_VARTEXT1: |
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case HA_KEYTYPE_VARTEXT2: |
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{
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int a_length,b_length,pack_length; |
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get_key_length(a_length,a); |
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get_key_pack_length(b_length,pack_length,b); |
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next_key_length=key_length-b_length-pack_length; |
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if (piks && |
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(flag= ha_compare_text(keyseg->charset,a,a_length,b,b_length, |
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(my_bool) ((nextflag & SEARCH_PREFIX) && |
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next_key_length <= 0), |
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(my_bool) ((nextflag & (SEARCH_FIND | |
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SEARCH_UPDATE)) == |
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SEARCH_FIND && |
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! (keyseg->flag & |
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HA_END_SPACE_ARE_EQUAL))))) |
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return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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a+= a_length; |
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b+= b_length; |
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break; |
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}
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break; |
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case HA_KEYTYPE_VARBINARY1: |
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case HA_KEYTYPE_VARBINARY2: |
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{
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int a_length,b_length,pack_length; |
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get_key_length(a_length,a); |
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get_key_pack_length(b_length,pack_length,b); |
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next_key_length=key_length-b_length-pack_length; |
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if (piks && |
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(flag=compare_bin(a,a_length,b,b_length, |
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(my_bool) ((nextflag & SEARCH_PREFIX) && |
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next_key_length <= 0), 0))) |
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return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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a+=a_length; |
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b+=b_length; |
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break; |
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}
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break; |
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case HA_KEYTYPE_INT8: |
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{
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int i_1= (int) *((signed char*) a); |
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int i_2= (int) *((signed char*) b); |
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if (piks && (flag = CMP_NUM(i_1,i_2))) |
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return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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a= end; |
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b++; |
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break; |
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}
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case HA_KEYTYPE_SHORT_INT: |
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s_1= mi_sint2korr(a); |
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s_2= mi_sint2korr(b); |
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if (piks && (flag = CMP_NUM(s_1,s_2))) |
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return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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a= end; |
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b+= 2; /* sizeof(short int); */ |
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break; |
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case HA_KEYTYPE_USHORT_INT: |
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{
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uint16 us_1,us_2; |
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us_1= mi_sint2korr(a); |
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us_2= mi_sint2korr(b); |
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298 |
if (piks && (flag = CMP_NUM(us_1,us_2))) |
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return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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a= end; |
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b+=2; /* sizeof(short int); */ |
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302 |
break; |
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303 |
}
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case HA_KEYTYPE_LONG_INT: |
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305 |
l_1= mi_sint4korr(a); |
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306 |
l_2= mi_sint4korr(b); |
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307 |
if (piks && (flag = CMP_NUM(l_1,l_2))) |
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308 |
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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309 |
a= end; |
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310 |
b+= 4; /* sizeof(long int); */ |
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311 |
break; |
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312 |
case HA_KEYTYPE_ULONG_INT: |
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313 |
u_1= mi_sint4korr(a); |
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314 |
u_2= mi_sint4korr(b); |
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315 |
if (piks && (flag = CMP_NUM(u_1,u_2))) |
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316 |
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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317 |
a= end; |
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318 |
b+= 4; /* sizeof(long int); */ |
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319 |
break; |
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320 |
case HA_KEYTYPE_INT24: |
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321 |
l_1=mi_sint3korr(a); |
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322 |
l_2=mi_sint3korr(b); |
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323 |
if (piks && (flag = CMP_NUM(l_1,l_2))) |
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324 |
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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325 |
a= end; |
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326 |
b+= 3; |
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327 |
break; |
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328 |
case HA_KEYTYPE_UINT24: |
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329 |
l_1=mi_uint3korr(a); |
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330 |
l_2=mi_uint3korr(b); |
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331 |
if (piks && (flag = CMP_NUM(l_1,l_2))) |
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332 |
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
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333 |
a= end; |
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334 |
b+= 3; |
|
335 |
break; |
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336 |
case HA_KEYTYPE_FLOAT: |
|
337 |
mi_float4get(f_1,a); |
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338 |
mi_float4get(f_2,b); |
|
339 |
/*
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|
340 |
The following may give a compiler warning about floating point
|
|
341 |
comparison not being safe, but this is ok in this context as
|
|
342 |
we are bascily doing sorting
|
|
343 |
*/
|
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344 |
if (piks && (flag = CMP_NUM(f_1,f_2))) |
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345 |
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
|
346 |
a= end; |
|
347 |
b+= 4; /* sizeof(float); */ |
|
348 |
break; |
|
349 |
case HA_KEYTYPE_DOUBLE: |
|
350 |
mi_float8get(d_1,a); |
|
351 |
mi_float8get(d_2,b); |
|
352 |
/*
|
|
353 |
The following may give a compiler warning about floating point
|
|
354 |
comparison not being safe, but this is ok in this context as
|
|
355 |
we are bascily doing sorting
|
|
356 |
*/
|
|
357 |
if (piks && (flag = CMP_NUM(d_1,d_2))) |
|
358 |
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
|
359 |
a= end; |
|
360 |
b+= 8; /* sizeof(double); */ |
|
361 |
break; |
|
362 |
case HA_KEYTYPE_NUM: /* Numeric key */ |
|
363 |
{
|
|
364 |
int swap_flag= 0; |
|
365 |
int alength,blength; |
|
366 |
||
367 |
if (keyseg->flag & HA_REVERSE_SORT) |
|
368 |
{
|
|
369 |
swap_variables(uchar*, a, b); |
|
370 |
swap_flag=1; /* Remember swap of a & b */ |
|
371 |
end= a+ (int) (end-b); |
|
372 |
}
|
|
373 |
if (keyseg->flag & HA_SPACE_PACK) |
|
374 |
{
|
|
375 |
alength= *a++; blength= *b++; |
|
376 |
end=a+alength; |
|
377 |
next_key_length=key_length-blength-1; |
|
378 |
}
|
|
379 |
else
|
|
380 |
{
|
|
381 |
alength= (int) (end-a); |
|
382 |
blength=keyseg->length; |
|
383 |
/* remove pre space from keys */
|
|
384 |
for ( ; alength && *a == ' ' ; a++, alength--) ; |
|
385 |
for ( ; blength && *b == ' ' ; b++, blength--) ; |
|
386 |
}
|
|
387 |
if (piks) |
|
388 |
{
|
|
389 |
if (*a == '-') |
|
390 |
{
|
|
391 |
if (*b != '-') |
|
392 |
return -1; |
|
393 |
a++; b++; |
|
394 |
swap_variables(uchar*, a, b); |
|
395 |
swap_variables(int, alength, blength); |
|
396 |
swap_flag=1-swap_flag; |
|
397 |
alength--; blength--; |
|
398 |
end=a+alength; |
|
399 |
}
|
|
400 |
else if (*b == '-') |
|
401 |
return 1; |
|
402 |
while (alength && (*a == '+' || *a == '0')) |
|
403 |
{
|
|
404 |
a++; alength--; |
|
405 |
}
|
|
406 |
while (blength && (*b == '+' || *b == '0')) |
|
407 |
{
|
|
408 |
b++; blength--; |
|
409 |
}
|
|
410 |
if (alength != blength) |
|
411 |
return (alength < blength) ? -1 : 1; |
|
412 |
while (a < end) |
|
413 |
if (*a++ != *b++) |
|
414 |
return ((int) a[-1] - (int) b[-1]); |
|
415 |
}
|
|
416 |
else
|
|
417 |
{
|
|
418 |
b+=(end-a); |
|
419 |
a=end; |
|
420 |
}
|
|
421 |
||
422 |
if (swap_flag) /* Restore pointers */ |
|
423 |
swap_variables(uchar*, a, b); |
|
424 |
break; |
|
425 |
}
|
|
426 |
#ifdef HAVE_LONG_LONG
|
|
427 |
case HA_KEYTYPE_LONGLONG: |
|
428 |
{
|
|
429 |
longlong ll_a,ll_b; |
|
430 |
ll_a= mi_sint8korr(a); |
|
431 |
ll_b= mi_sint8korr(b); |
|
432 |
if (piks && (flag = CMP_NUM(ll_a,ll_b))) |
|
433 |
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
|
434 |
a= end; |
|
435 |
b+= 8; |
|
436 |
break; |
|
437 |
}
|
|
438 |
case HA_KEYTYPE_ULONGLONG: |
|
439 |
{
|
|
440 |
ulonglong ll_a,ll_b; |
|
441 |
ll_a= mi_uint8korr(a); |
|
442 |
ll_b= mi_uint8korr(b); |
|
443 |
if (piks && (flag = CMP_NUM(ll_a,ll_b))) |
|
444 |
return ((keyseg->flag & HA_REVERSE_SORT) ? -flag : flag); |
|
445 |
a= end; |
|
446 |
b+= 8; |
|
447 |
break; |
|
448 |
}
|
|
449 |
#endif
|
|
450 |
case HA_KEYTYPE_END: /* Ready */ |
|
451 |
goto end; /* diff_pos is incremented */ |
|
452 |
}
|
|
453 |
}
|
|
454 |
(*diff_pos)++; |
|
455 |
end: |
|
456 |
if (!(nextflag & SEARCH_FIND)) |
|
457 |
{
|
|
458 |
uint i; |
|
459 |
if (nextflag & (SEARCH_NO_FIND | SEARCH_LAST)) /* Find record after key */ |
|
460 |
return (nextflag & (SEARCH_BIGGER | SEARCH_LAST)) ? -1 : 1; |
|
461 |
flag=0; |
|
462 |
for (i=keyseg->length ; i-- > 0 ; ) |
|
463 |
{
|
|
464 |
if (*a++ != *b++) |
|
465 |
{
|
|
466 |
flag= FCMP(a[-1],b[-1]); |
|
467 |
break; |
|
468 |
}
|
|
469 |
}
|
|
470 |
if (nextflag & SEARCH_SAME) |
|
471 |
return (flag); /* read same */ |
|
472 |
if (nextflag & SEARCH_BIGGER) |
|
473 |
return (flag <= 0 ? -1 : 1); /* read next */ |
|
474 |
return (flag < 0 ? -1 : 1); /* read previous */ |
|
475 |
}
|
|
476 |
return 0; |
|
477 |
} /* ha_key_cmp */ |
|
478 |
||
479 |
||
480 |
/*
|
|
481 |
Find the first NULL value in index-suffix values tuple
|
|
482 |
||
483 |
SYNOPSIS
|
|
484 |
ha_find_null()
|
|
485 |
keyseg Array of keyparts for key suffix
|
|
486 |
a Key suffix value tuple
|
|
487 |
||
488 |
DESCRIPTION
|
|
489 |
Find the first NULL value in index-suffix values tuple.
|
|
490 |
||
491 |
TODO
|
|
492 |
Consider optimizing this function or its use so we don't search for
|
|
493 |
NULL values in completely NOT NULL index suffixes.
|
|
494 |
||
495 |
RETURN
|
|
496 |
First key part that has NULL as value in values tuple, or the last key
|
|
497 |
part (with keyseg->type==HA_TYPE_END) if values tuple doesn't contain
|
|
498 |
NULLs.
|
|
499 |
*/
|
|
500 |
||
501 |
HA_KEYSEG *ha_find_null(HA_KEYSEG *keyseg, uchar *a) |
|
502 |
{
|
|
503 |
for (; (enum ha_base_keytype) keyseg->type != HA_KEYTYPE_END; keyseg++) |
|
504 |
{
|
|
505 |
uchar *end; |
|
506 |
if (keyseg->null_bit) |
|
507 |
{
|
|
508 |
if (!*a++) |
|
509 |
return keyseg; |
|
510 |
}
|
|
511 |
end= a+ keyseg->length; |
|
512 |
||
513 |
switch ((enum ha_base_keytype) keyseg->type) { |
|
514 |
case HA_KEYTYPE_TEXT: |
|
515 |
case HA_KEYTYPE_BINARY: |
|
516 |
case HA_KEYTYPE_BIT: |
|
517 |
if (keyseg->flag & HA_SPACE_PACK) |
|
518 |
{
|
|
519 |
int a_length; |
|
520 |
get_key_length(a_length, a); |
|
521 |
a += a_length; |
|
522 |
break; |
|
523 |
}
|
|
524 |
else
|
|
525 |
a= end; |
|
526 |
break; |
|
527 |
case HA_KEYTYPE_VARTEXT1: |
|
528 |
case HA_KEYTYPE_VARTEXT2: |
|
529 |
case HA_KEYTYPE_VARBINARY1: |
|
530 |
case HA_KEYTYPE_VARBINARY2: |
|
531 |
{
|
|
532 |
int a_length; |
|
533 |
get_key_length(a_length, a); |
|
534 |
a+= a_length; |
|
535 |
break; |
|
536 |
}
|
|
537 |
case HA_KEYTYPE_NUM: |
|
538 |
if (keyseg->flag & HA_SPACE_PACK) |
|
539 |
{
|
|
540 |
int alength= *a++; |
|
541 |
end= a+alength; |
|
542 |
}
|
|
543 |
a= end; |
|
544 |
break; |
|
545 |
case HA_KEYTYPE_INT8: |
|
546 |
case HA_KEYTYPE_SHORT_INT: |
|
547 |
case HA_KEYTYPE_USHORT_INT: |
|
548 |
case HA_KEYTYPE_LONG_INT: |
|
549 |
case HA_KEYTYPE_ULONG_INT: |
|
550 |
case HA_KEYTYPE_INT24: |
|
551 |
case HA_KEYTYPE_UINT24: |
|
552 |
#ifdef HAVE_LONG_LONG
|
|
553 |
case HA_KEYTYPE_LONGLONG: |
|
554 |
case HA_KEYTYPE_ULONGLONG: |
|
555 |
#endif
|
|
556 |
case HA_KEYTYPE_FLOAT: |
|
557 |
case HA_KEYTYPE_DOUBLE: |
|
558 |
a= end; |
|
559 |
break; |
|
560 |
case HA_KEYTYPE_END: /* purecov: inspected */ |
|
561 |
/* keep compiler happy */
|
|
562 |
DBUG_ASSERT(0); |
|
563 |
break; |
|
564 |
}
|
|
565 |
}
|
|
566 |
return keyseg; |
|
567 |
}
|
|
568 |
||
569 |
||
570 |
||
571 |
/*
|
|
572 |
Register handler error messages for usage with my_error()
|
|
573 |
||
574 |
NOTES
|
|
575 |
This is safe to call multiple times as my_error_register()
|
|
576 |
will ignore calls to register already registered error numbers.
|
|
577 |
*/
|
|
578 |
||
579 |
||
580 |
void my_handler_error_register(void) |
|
581 |
{
|
|
582 |
/*
|
|
583 |
If you got compilation error here about compile_time_assert array, check
|
|
584 |
that every HA_ERR_xxx constant has a corresponding error message in
|
|
585 |
handler_error_messages[] list (check mysys/ma_handler_errors.h and
|
|
586 |
include/my_base.h).
|
|
587 |
*/
|
|
588 |
compile_time_assert(HA_ERR_FIRST + array_elements(handler_error_messages) == |
|
589 |
HA_ERR_LAST + 1); |
|
590 |
my_error_register(handler_error_messages, HA_ERR_FIRST, |
|
591 |
HA_ERR_FIRST+ array_elements(handler_error_messages)-1); |
|
592 |
}
|
|
593 |
||
594 |
||
595 |
void my_handler_error_unregister(void) |
|
596 |
{
|
|
597 |
my_error_unregister(HA_ERR_FIRST, |
|
598 |
HA_ERR_FIRST+ array_elements(handler_error_messages)-1); |
|
599 |
}
|