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/* * Copyright (c) 2015, 2023, Oracle and/or its affiliates. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, version 2.0, * as published by the Free Software Foundation. * * This program is also distributed with certain software (including * but not limited to OpenSSL) that is licensed under separate terms, * as designated in a particular file or component or in included license * documentation. The authors of MySQL hereby grant you an additional * permission to link the program and your derivative works with the * separately licensed software that they have included with MySQL. * * 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, version 2.0, 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 */ #include "query_string_builder.h" #include "mysql/plugin.h" #include "my_sys.h" // escape_string_for_mysql using namespace xpl; charset_info_st* Query_string_builder::m_charset = NULL; my_thread_once_t Query_string_builder::m_charset_initialized = MY_THREAD_ONCE_INIT; void Query_string_builder::init_charset() { m_charset = get_charset_by_csname("utf8mb4", MY_CS_PRIMARY, MYF(MY_WME)); } Query_string_builder::Query_string_builder(size_t reserve) : m_in_quoted(false), m_in_identifier(false) { my_thread_once(&m_charset_initialized, init_charset); assert(m_charset != NULL); m_str.reserve(reserve); } Query_string_builder::~Query_string_builder() { } Query_string_builder &Query_string_builder::quote_identifier(const char *s, size_t length) { m_str.append("`"); escape_identifier(s, length); m_str.append("`"); return *this; } Query_string_builder &Query_string_builder::quote_identifier_if_needed(const char *s, size_t length) { bool need_quote = false; if (length > 0 && isalpha(s[0])) { for (size_t i = 1; i < length; i++) if (!isalnum(s[i]) && s[i] != '_') { need_quote = true; break; } } else need_quote = true; if (need_quote) return quote_identifier(s, length); else return put(s, length); } Query_string_builder &Query_string_builder::escape_identifier(const char *s, size_t length) { size_t str_pos = m_str.size(); // resize the buffer to fit the original size + worst case length of s m_str.resize(str_pos + length*2); char* cursor_out = &m_str[str_pos]; const char* cursor_in = s; for (size_t idx = 0; idx < length; ++idx) { if (*cursor_in == '`') *cursor_out++ = '`'; *cursor_out++ = *cursor_in++; } m_str.resize(str_pos + (cursor_out - &m_str[str_pos])); return *this; } Query_string_builder &Query_string_builder::escape_string(const char *s, size_t length) { size_t str_pos = m_str.size(); // resize the buffer to fit the original size + worst case length of s m_str.resize(str_pos + 2*length+1); size_t r = escape_string_for_mysql(m_charset, &m_str[str_pos], 2*length+1, s, length); m_str.resize(str_pos + r); return *this; } Query_string_builder &Query_string_builder::quote_string(const char *s, size_t length) { m_str.append("'"); escape_string(s, length); m_str.append("'"); return *this; } Query_string_builder &Query_string_builder::put(const char *s, size_t length) { if (m_in_quoted) escape_string(s, length); else if (m_in_identifier) escape_identifier(s, length); else m_str.append(s, length); return *this; } Query_formatter Query_string_builder::format() { return Query_formatter(m_str, *m_charset); }