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mariadb/strings/ctype-bin.c
Alexander Barkov 8020b1bd73 MDEV-30034 UNIQUE USING HASH accepts duplicate entries for tricky collations 
- Adding a new argument "flag" to MY_COLLATION_HANDLER::strnncollsp_nchars()
  and a flag MY_STRNNCOLLSP_NCHARS_EMULATE_TRIMMED_TRAILING_SPACES.
  The flag defines if strnncollsp_nchars() should emulate trailing spaces
  which were possibly trimmed earlier (e.g. in InnoDB CHAR compression).
  This is important for NOPAD collations.

  For example, with this input:
   - str1= 'a '    (Latin letter a followed by one space)
   - str2= 'a  '   (Latin letter a followed by two spaces)
   - nchars= 3
  if the flag is given, strnncollsp_nchars() will virtually restore
  one trailing space to str1 up to nchars (3) characters and compare two
  strings as equal:
  - str1= 'a  '  (one extra trailing space emulated)
  - str2= 'a  '  (as is)

  If the flag is not given, strnncollsp_nchars() does not add trailing
  virtual spaces, so in case of a NOPAD collation, str1 will be compared
  as less than str2 because it is shorter.

- Field_string::cmp_prefix() now passes the new flag.
  Field_varstring::cmp_prefix() and Field_blob::cmp_prefix() do
  not pass the new flag.

- The branch in cmp_whole_field() in storage/innobase/rem/rem0cmp.cc
  (which handles the CHAR data type) now also passed the new flag.

- Fixing UCA collations to respect the new flag.
  Other collations are possibly also affected, however
  I had no success in making an SQL script demonstrating the problem.
  Other collations will be extended to respect this flags in a separate
  patch later.

- Changing the meaning of the last parameter of Field::cmp_prefix()
  from "number of bytes" (internal length)
  to "number of characters" (user visible length).

  The code calling cmp_prefix() from handler.cc was wrong.
  After this change, the call in handler.cc became correct.

  The code calling cmp_prefix() from key_rec_cmp() in key.cc
  was adjusted according to this change.

- Old strnncollsp_nchar() related tests in unittest/strings/strings-t.c
  now pass the new flag.
  A few new tests also were added, without the flag.
2023-04-04 12:30:50 +04:00

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/* Copyright (c) 2002-2007 MySQL AB & tommy@valley.ne.jp
Copyright (c) 2002, 2014, Oracle and/or its affiliates.
Copyright (c) 2009, 2020, MariaDB Corporation.
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; version 2
of the License.
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., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1335 USA */
/* This file is for binary pseudo charset, created by bar@mysql.com */
#include "strings_def.h"
#include <m_ctype.h>
static const uchar ctype_bin[]=
{
0,
32, 32, 32, 32, 32, 32, 32, 32, 32, 40, 40, 40, 40, 40, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
72, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
132,132,132,132,132,132,132,132,132,132, 16, 16, 16, 16, 16, 16,
16,129,129,129,129,129,129, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 16, 16, 16, 16, 16,
16,130,130,130,130,130,130, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 16, 16, 16, 16, 32,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
/* Dummy array for toupper / tolower / sortorder */
static const uchar bin_char_array[] =
{
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
96, 97, 98, 99,100,101,102,103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,
240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255
};
static my_bool
my_coll_init_8bit_bin(struct charset_info_st *cs,
MY_CHARSET_LOADER *loader __attribute__((unused)))
{
cs->max_sort_char=255;
return FALSE;
}
static int my_strnncoll_binary(CHARSET_INFO * cs __attribute__((unused)),
const uchar *s, size_t slen,
const uchar *t, size_t tlen,
my_bool t_is_prefix)
{
size_t len=MY_MIN(slen,tlen);
int cmp= memcmp(s,t,len);
return cmp ? cmp : (int)((t_is_prefix ? len : slen) - tlen);
}
size_t my_lengthsp_binary(CHARSET_INFO *cs __attribute__((unused)),
const char *ptr __attribute__((unused)),
size_t length)
{
return length;
}
/*
Compare two strings. Result is sign(first_argument - second_argument)
SYNOPSIS
my_strnncollsp_binary()
cs Chararacter set
s String to compare
slen Length of 's'
t String to compare
tlen Length of 't'
NOTE
This function is used for real binary strings, i.e. for
BLOB, BINARY(N) and VARBINARY(N).
It compares trailing spaces as spaces.
RETURN
< 0 s < t
0 s == t
> 0 s > t
*/
static int my_strnncollsp_binary(CHARSET_INFO * cs __attribute__((unused)),
const uchar *s, size_t slen,
const uchar *t, size_t tlen)
{
return my_strnncoll_binary(cs,s,slen,t,tlen,0);
}
static int my_strnncollsp_nchars_binary(CHARSET_INFO * cs __attribute__((unused)),
const uchar *s, size_t slen,
const uchar *t, size_t tlen,
size_t nchars,
uint flags)
{
set_if_smaller(slen, nchars);
set_if_smaller(tlen, nchars);
return my_strnncoll_binary(cs, s, slen, t, tlen, 0);
}
static int my_strnncoll_8bit_bin(CHARSET_INFO * cs __attribute__((unused)),
const uchar *s, size_t slen,
const uchar *t, size_t tlen,
my_bool t_is_prefix)
{
size_t len=MY_MIN(slen,tlen);
int cmp= memcmp(s,t,len);
return cmp ? cmp : (int)((t_is_prefix ? len : slen) - tlen);
}
/*
Compare a string to an array of spaces, for PAD SPACE behaviour.
@param str - the string
@param length - the length of the string
@return <0 - if a byte less than SPACE was found
@return >0 - if a byte greater than SPACE was found
@return 0 - if the string entirely consists of SPACE characters
*/
int my_strnncollsp_padspace_bin(const uchar *str, size_t length)
{
for ( ; length ; str++, length--)
{
if (*str < ' ')
return -1;
else if (*str > ' ')
return 1;
}
return 0;
}
/*
Compare two strings. Result is sign(first_argument - second_argument)
SYNOPSIS
my_strnncollsp_8bit_bin()
cs Chararacter set
s String to compare
slen Length of 's'
t String to compare
tlen Length of 't'
NOTE
This function is used for character strings with binary collations.
The shorter string is extended with end space to be as long as the longer
one.
RETURN
< 0 s < t
0 s == t
> 0 s > t
*/
static int my_strnncollsp_8bit_bin(CHARSET_INFO * cs __attribute__((unused)),
const uchar *a, size_t a_length,
const uchar *b, size_t b_length)
{
const uchar *end;
size_t length;
end= a + (length= MY_MIN(a_length, b_length));
while (a < end)
{
if (*a++ != *b++)
return ((int) a[-1] - (int) b[-1]);
}
return a_length == b_length ? 0 :
a_length < b_length ?
-my_strnncollsp_padspace_bin(b, b_length - length) :
my_strnncollsp_padspace_bin(a, a_length - length);
}
static int my_strnncollsp_nchars_8bit_bin(CHARSET_INFO * cs,
const uchar *a, size_t a_length,
const uchar *b, size_t b_length,
size_t nchars,
uint flags)
{
set_if_smaller(a_length, nchars);
set_if_smaller(b_length, nchars);
return my_strnncollsp_8bit_bin(cs, a, a_length, b, b_length);
}
static int my_strnncollsp_8bit_nopad_bin(CHARSET_INFO * cs
__attribute__((unused)),
const uchar *a, size_t a_length,
const uchar *b, size_t b_length)
{
return my_strnncoll_8bit_bin(cs, a, a_length, b, b_length, FALSE);
}
/* This function is used for all conversion functions */
static size_t my_case_str_bin(CHARSET_INFO *cs __attribute__((unused)),
char *str __attribute__((unused)))
{
return 0;
}
static size_t my_case_bin(CHARSET_INFO *cs __attribute__((unused)),
const char *src, size_t srclen,
char *dst, size_t dstlen __attribute__((unused)))
{
DBUG_ASSERT(srclen <= dstlen);
memcpy(dst, src, srclen);
return srclen;
}
static int my_strcasecmp_bin(CHARSET_INFO * cs __attribute__((unused)),
const char *s, const char *t)
{
return strcmp(s,t);
}
static int my_mb_wc_bin(CHARSET_INFO *cs __attribute__((unused)),
my_wc_t *wc,
const uchar *str,
const uchar *end __attribute__((unused)))
{
if (str >= end)
return MY_CS_TOOSMALL;
*wc=str[0];
return 1;
}
int my_wc_mb_bin(CHARSET_INFO *cs __attribute__((unused)),
my_wc_t wc, uchar *s, uchar *e)
{
if (s >= e)
return MY_CS_TOOSMALL;
if (wc < 256)
{
s[0]= (char) wc;
return 1;
}
return MY_CS_ILUNI;
}
void my_hash_sort_bin(CHARSET_INFO *cs __attribute__((unused)),
const uchar *key, size_t len,ulong *nr1, ulong *nr2)
{
const uchar *end = key + len;
ulong tmp1= *nr1;
ulong tmp2= *nr2;
for (; key < end ; key++)
{
MY_HASH_ADD(tmp1, tmp2, (uint) *key);
}
*nr1= tmp1;
*nr2= tmp2;
}
void my_hash_sort_8bit_bin(CHARSET_INFO *cs __attribute__((unused)),
const uchar *key, size_t len,
ulong *nr1, ulong *nr2)
{
/*
Remove trailing spaces. We have to do this to be able to compare
'A ' and 'A' as identical
*/
const uchar *end= skip_trailing_space(key, len);
my_hash_sort_bin(cs, key, end - key, nr1, nr2);
}
/*
The following defines is here to keep the following code identical to
the one in ctype-simple.c
*/
#define likeconv(s,A) (A)
#define INC_PTR(cs,A,B) (A)++
static
int my_wildcmp_bin_impl(CHARSET_INFO *cs,
const char *str,const char *str_end,
const char *wildstr,const char *wildend,
int escape, int w_one, int w_many, int recurse_level)
{
int result= -1; /* Not found, using wildcards */
if (my_string_stack_guard && my_string_stack_guard(recurse_level))
return 1;
while (wildstr != wildend)
{
while (*wildstr != w_many && *wildstr != w_one)
{
if (*wildstr == escape && wildstr+1 != wildend)
wildstr++;
if (str == str_end || likeconv(cs,*wildstr++) != likeconv(cs,*str++))
return(1); /* No match */
if (wildstr == wildend)
return(str != str_end); /* Match if both are at end */
result=1; /* Found an anchor char */
}
if (*wildstr == w_one)
{
do
{
if (str == str_end) /* Skip one char if possible */
return(result);
INC_PTR(cs,str,str_end);
} while (++wildstr < wildend && *wildstr == w_one);
if (wildstr == wildend)
break;
}
if (*wildstr == w_many)
{ /* Found w_many */
uchar cmp;
wildstr++;
/* Remove any '%' and '_' from the wild search string */
for (; wildstr != wildend ; wildstr++)
{
if (*wildstr == w_many)
continue;
if (*wildstr == w_one)
{
if (str == str_end)
return(-1);
INC_PTR(cs,str,str_end);
continue;
}
break; /* Not a wild character */
}
if (wildstr == wildend)
return(0); /* match if w_many is last */
if (str == str_end)
return(-1);
if ((cmp= *wildstr) == escape && wildstr+1 != wildend)
cmp= *++wildstr;
INC_PTR(cs,wildstr,wildend); /* This is compared through cmp */
cmp=likeconv(cs,cmp);
do
{
while (str != str_end && (uchar) likeconv(cs,*str) != cmp)
str++;
if (str++ == str_end)
return(-1);
{
int tmp=my_wildcmp_bin_impl(cs,str,str_end,wildstr,wildend,escape,w_one,
w_many, recurse_level + 1);
if (tmp <= 0)
return(tmp);
}
} while (str != str_end);
return(-1);
}
}
return(str != str_end ? 1 : 0);
}
int my_wildcmp_bin(CHARSET_INFO *cs,
const char *str,const char *str_end,
const char *wildstr,const char *wildend,
int escape, int w_one, int w_many)
{
return my_wildcmp_bin_impl(cs, str, str_end,
wildstr, wildend,
escape, w_one, w_many, 1);
}
static size_t
my_strnxfrm_8bit_bin(CHARSET_INFO *cs,
uchar * dst, size_t dstlen, uint nweights,
const uchar *src, size_t srclen, uint flags)
{
set_if_smaller(srclen, dstlen);
set_if_smaller(srclen, nweights);
if (srclen && dst != src)
memcpy(dst, src, srclen);
return my_strxfrm_pad_desc_and_reverse(cs, dst, dst + srclen, dst + dstlen,
(uint)(nweights - srclen), flags, 0);
}
static size_t
my_strnxfrm_8bit_nopad_bin(CHARSET_INFO *cs,
uchar * dst, size_t dstlen, uint nweights,
const uchar *src, size_t srclen, uint flags)
{
set_if_smaller(srclen, dstlen);
set_if_smaller(srclen, nweights);
if (dst != src)
memcpy(dst, src, srclen);
return my_strxfrm_pad_desc_and_reverse_nopad(cs, dst, dst + srclen,
dst + dstlen,(uint)(nweights - srclen),
flags, 0);
}
static
uint my_instr_bin(CHARSET_INFO *cs __attribute__((unused)),
const char *b, size_t b_length,
const char *s, size_t s_length,
my_match_t *match, uint nmatch)
{
register const uchar *str, *search, *end, *search_end;
if (s_length <= b_length)
{
if (!s_length)
{
if (nmatch)
{
match->beg= 0;
match->end= 0;
match->mb_len= 0;
}
return 1; /* Empty string is always found */
}
str= (const uchar*) b;
search= (const uchar*) s;
end= (const uchar*) b+b_length-s_length+1;
search_end= (const uchar*) s + s_length;
skip:
while (str != end)
{
if ( (*str++) == (*search))
{
register const uchar *i,*j;
i= str;
j= search+1;
while (j != search_end)
if ((*i++) != (*j++))
goto skip;
if (nmatch > 0)
{
match[0].beg= 0;
match[0].end= (uint) (str- (const uchar*)b-1);
match[0].mb_len= match[0].end;
if (nmatch > 1)
{
match[1].beg= match[0].end;
match[1].end= (uint)(match[0].end+s_length);
match[1].mb_len= match[1].end-match[1].beg;
}
}
return 2;
}
}
}
return 0;
}
MY_COLLATION_HANDLER my_collation_8bit_bin_handler =
{
my_coll_init_8bit_bin,
my_strnncoll_8bit_bin,
my_strnncollsp_8bit_bin,
my_strnncollsp_nchars_8bit_bin,
my_strnxfrm_8bit_bin,
my_strnxfrmlen_simple,
my_like_range_simple,
my_wildcmp_bin,
my_strcasecmp_bin,
my_instr_bin,
my_hash_sort_8bit_bin,
my_propagate_simple
};
MY_COLLATION_HANDLER my_collation_8bit_nopad_bin_handler =
{
my_coll_init_8bit_bin,
my_strnncoll_8bit_bin,
my_strnncollsp_8bit_nopad_bin,
my_strnncollsp_nchars_8bit_bin,
my_strnxfrm_8bit_nopad_bin,
my_strnxfrmlen_simple,
my_like_range_simple,
my_wildcmp_bin,
my_strcasecmp_bin,
my_instr_bin,
my_hash_sort_bin,
my_propagate_simple
};
static MY_COLLATION_HANDLER my_collation_binary_handler =
{
NULL, /* init */
my_strnncoll_binary,
my_strnncollsp_binary,
my_strnncollsp_nchars_binary,
my_strnxfrm_8bit_bin,
my_strnxfrmlen_simple,
my_like_range_simple,
my_wildcmp_bin,
my_strcasecmp_bin,
my_instr_bin,
my_hash_sort_bin,
my_propagate_simple
};
static MY_CHARSET_HANDLER my_charset_handler=
{
NULL, /* init */
my_numchars_8bit,
my_charpos_8bit,
my_lengthsp_binary,
my_numcells_8bit,
my_mb_wc_bin,
my_wc_mb_bin,
my_mb_ctype_8bit,
my_case_str_bin,
my_case_str_bin,
my_case_bin,
my_case_bin,
my_snprintf_8bit,
my_long10_to_str_8bit,
my_longlong10_to_str_8bit,
my_fill_8bit,
my_strntol_8bit,
my_strntoul_8bit,
my_strntoll_8bit,
my_strntoull_8bit,
my_strntod_8bit,
my_strtoll10_8bit,
my_strntoull10rnd_8bit,
my_scan_8bit,
my_charlen_8bit,
my_well_formed_char_length_8bit,
my_copy_8bit,
my_wc_mb_bin,
};
struct charset_info_st my_charset_bin =
{
63,0,0, /* number */
MY_CS_COMPILED|MY_CS_BINSORT|MY_CS_PRIMARY|MY_CS_NOPAD,/* state */
"binary", /* cs name */
"binary", /* name */
"", /* comment */
NULL, /* tailoring */
ctype_bin, /* ctype */
bin_char_array, /* to_lower */
bin_char_array, /* to_upper */
NULL, /* sort_order */
NULL, /* uca */
NULL, /* tab_to_uni */
NULL, /* tab_from_uni */
&my_unicase_default, /* caseinfo */
NULL, /* state_map */
NULL, /* ident_map */
1, /* strxfrm_multiply */
1, /* caseup_multiply */
1, /* casedn_multiply */
1, /* mbminlen */
1, /* mbmaxlen */
0, /* min_sort_char */
255, /* max_sort_char */
0, /* pad char */
0, /* escape_with_backslash_is_dangerous */
1, /* levels_for_order */
&my_charset_handler,
&my_collation_binary_handler
};
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