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53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
/* Copyright (c) 2024, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of 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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#ifndef SCAN_CHAR_H
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#define SCAN_CHAR_H
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/**
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A helper class to store the head character of a string,
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with help of a charlen() call.
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*/
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class Scan_char
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{
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const char *m_ptr; // The start of the character
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int m_length; // The result:
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// >0 - the character octet length
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// <=0 - an error (e.g. end of input, wrong byte sequence)
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public:
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Scan_char(CHARSET_INFO *const cs, const char *str, const char *end)
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:m_ptr(str), m_length(cs->charlen(str, end))
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{ }
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// Compare if two non-erroneous characters are equal
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bool eq(const Scan_char &rhs) const
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{
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DBUG_ASSERT(m_length > 0);
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DBUG_ASSERT(rhs.m_length > 0);
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return m_length == rhs.m_length &&
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!memcmp(m_ptr, rhs.m_ptr, (size_t) m_length);
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}
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// Compare if two possibly erroneous characters are equal
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bool eq_safe(const Scan_char &rhs) const
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{
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return m_length == rhs.m_length && m_length > 0 &&
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!memcmp(m_ptr, rhs.m_ptr, (size_t) m_length);
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}
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const char *ptr() const { return m_ptr; }
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int length() const { return m_length; }
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};
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#endif // SCAN_CHAR_H
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