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b956a6a259
- Adding a class Lex_ident_fs, to store identifiers for on-disk
database objects, such as databases, tables, triggers.
- Moving the validation code from check_db_name()
to non-modifying methods in Lex_ident_fs:
Lex_ident_fs::check_body()
Lex_ident_fs::check_db_name()
Adding a new method Lex_ident_fs::check_db_name_with_error(),
which performs validation and raises an error on validation failure.
Unlike the old function check_db_name(), the new class Lex_ident_fs
does not lower-case the identifier during the validation.
Lower-casing must be done before calling Lex_ident_fs validation methods.
- Adding a low level helper template class CharBuffer which can:
* store exact or lower-cased strings with a short fixed maximum length
* return the value as a LEX_CSTRING efficiently
- Adding a helper template class DBNameBuffer (deriving from CharBuffer), to
allocate optionally lower-cased database identifiers on stack when relevant.
Useful for temporary values which don't need to be allocated on MEM_ROOT.
- Using DBNameBuffer in mysql_change_db()
- Using DBNameBuffer in show_create_db()
72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
#ifndef CHAR_BUFFER_INCLUDED
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#define CHAR_BUFFER_INCLUDED
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/*
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Copyright (c) 2023, MariaDB
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA
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*/
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/*
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A string buffer with length.
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This template class is useful to store things like database, table names,
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whose maximum length a small fixed known value. Mainly to be used as
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stack variables to store temporary values.
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Can store exact string copies or casefolded string copies.
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The stored value is returned as a LEX_CSTRING.
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*/
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template<size_t buff_sz>
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class CharBuffer
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{
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char m_buff[buff_sz + 1 /* one extra byte for '\0' */];
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size_t m_length;
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public:
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CharBuffer()
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:m_length(0)
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{
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m_buff[0]= '\0';
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}
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CharBuffer<buff_sz> & copy_bin(const LEX_CSTRING &str)
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{
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m_length= MY_MIN(buff_sz, str.length);
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memcpy(m_buff, str.str, m_length);
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m_buff[m_length]= '\0';
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return *this;
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}
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CharBuffer<buff_sz> & copy_casedn(CHARSET_INFO *cs, const LEX_CSTRING &str)
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{
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m_length= cs->cset->casedn(cs, str.str, str.length, m_buff, buff_sz);
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/*
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casedn() never writes outsize of buff_sz (unless a bug in casedn()),
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so it's safe to write '\0' at the position m_length:
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*/
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DBUG_ASSERT(m_length <= buff_sz);
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m_buff[m_length]= '\0';
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return *this;
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}
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CharBuffer<buff_sz> & copy_casedn(CHARSET_INFO *cs, const LEX_CSTRING &str,
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bool casedn)
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{
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casedn ? copy_casedn(cs, str) : copy_bin(str);
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return *this;
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}
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LEX_CSTRING to_lex_cstring() const
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{
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return LEX_CSTRING{m_buff, m_length};
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}
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};
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#endif // CHAR_BUFFER_INCLUDED
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