Viewing file:  vers_string.h (2.8 KB) -rw-r--r--
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/*
Copyright (c) 2018, MariaDB Corporation.
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 */
#ifndef VERS_STRING_INCLUDED
#define VERS_STRING_INCLUDED
/*
LEX_CSTRING with comparison semantics.
*/
// db and table names: case sensitive (or insensitive) in table_alias_charset
struct Compare_table_names
{
int operator()(const LEX_CSTRING& a, const LEX_CSTRING& b) const
{
DBUG_ASSERT(a.str[a.length] == 0);
DBUG_ASSERT(b.str[b.length] == 0);
return my_strnncoll(table_alias_charset,
(uchar*)a.str, a.length,
(uchar*)b.str, b.length);
}
};
// column names and other identifiers: case insensitive in system_charset_info
struct Compare_identifiers
{
int operator()(const LEX_CSTRING& a, const LEX_CSTRING& b) const
{
DBUG_ASSERT(a.str[a.length] == 0);
DBUG_ASSERT(b.str[b.length] == 0);
return my_strcasecmp(system_charset_info, a.str, b.str);
}
};
class Lex_cstring : public LEX_CSTRING
{
public:
Lex_cstring()
{
str= NULL;
length= 0;
}
Lex_cstring(const char *_str, size_t _len)
{
str= _str;
length= _len;
}
Lex_cstring(const char *start, const char *end)
{
DBUG_ASSERT(start <= end);
str= start;
length= end - start;
}
void set(const char *_str, size_t _len)
{
str= _str;
length= _len;
}
};
template <class Compare>
struct Lex_cstring_with_compare : public Lex_cstring
{
public:
Lex_cstring_with_compare() {}
Lex_cstring_with_compare(const char *_str, size_t _len) :
Lex_cstring(_str, _len)
{ }
Lex_cstring_with_compare(const LEX_STRING src) :
Lex_cstring(src.str, src.length)
{ }
Lex_cstring_with_compare(const LEX_CSTRING src) : Lex_cstring(src.str, src.length)
{ }
Lex_cstring_with_compare(const char *_str) : Lex_cstring(_str, strlen(_str))
{ }
bool streq(const Lex_cstring_with_compare& b) const
{
return Lex_cstring::length == b.length && 0 == Compare()(*this, b);
}
operator const char* () const
{
return str;
}
operator bool () const
{
return str != NULL;
}
};
typedef Lex_cstring_with_compare<Compare_identifiers> Lex_ident;
typedef Lex_cstring_with_compare<Compare_table_names> Lex_table_name;
#endif // VERS_STRING_INCLUDED
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