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113 lines
3.5 KiB
113 lines
3.5 KiB
5 months ago
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/* Copyright (c) 2002, 2019, Oracle and/or its affiliates. All rights reserved.
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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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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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, version 2.0, 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 02110-1301 USA */
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/*
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Functions to read and parse geometrical data.
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NOTE: These functions assumes that the string is end \0 terminated!
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*/
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#include "sql/gstream.h"
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#include <string.h>
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#include <sys/types.h>
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#include "m_string.h" // my_stpcpy
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#include "my_inttypes.h"
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#include "my_sys.h"
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#include "sql/psi_memory_key.h"
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static inline bool is_numeric_beginning(const char *pc, const size_t len) {
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return (pc != NULL &&
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((*pc >= '0' && *pc <= '9') || *pc == '-' || *pc == '+' ||
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(*pc == '.' && len > 1 && pc[1] >= '0' && pc[1] <= '9')));
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}
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enum Gis_read_stream::enum_tok_types Gis_read_stream::get_next_toc_type() {
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skip_space();
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if (m_cur >= m_limit) return eostream;
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if (my_isvar_start(&my_charset_bin, *m_cur)) return word;
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if (is_numeric_beginning(m_cur, m_limit - m_cur)) return numeric;
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if (*m_cur == '(') return l_bra;
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if (*m_cur == ')') return r_bra;
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if (*m_cur == ',') return comma;
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return unknown;
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}
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bool Gis_read_stream::get_next_word(LEX_CSTRING *res) {
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skip_space();
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res->str = m_cur;
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/* The following will also test for \0 */
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if ((m_cur >= m_limit) || !my_isvar_start(&my_charset_bin, *m_cur)) return 1;
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/*
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We can't combine the following increment with my_isvar() because
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my_isvar() is a macro that would cause side effects
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*/
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m_cur++;
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while ((m_cur < m_limit) && my_isvar(&my_charset_bin, *m_cur)) m_cur++;
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res->length = (uint32)(m_cur - res->str);
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return 0;
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}
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/* Read a floating point number. */
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bool Gis_read_stream::get_next_number(double *d) {
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const char *endptr;
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int err;
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skip_space();
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if ((m_cur >= m_limit) || !is_numeric_beginning(m_cur, m_limit - m_cur)) {
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set_error_msg("Numeric constant expected");
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return 1;
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}
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*d = my_strntod(m_charset, m_cur, (uint)(m_limit - m_cur), &endptr, &err);
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if (err) return 1;
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if (endptr) m_cur = endptr;
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return 0;
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}
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bool Gis_read_stream::check_next_symbol(char symbol) {
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skip_space();
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if ((m_cur >= m_limit) || (*m_cur != symbol)) {
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char buff[32];
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my_stpcpy(buff, "'?' expected");
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buff[2] = symbol;
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set_error_msg(buff);
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return 1;
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}
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m_cur++;
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return 0;
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}
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/*
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Remember error message.
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*/
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void Gis_read_stream::set_error_msg(const char *msg) {
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size_t len = strlen(msg); // ok in this context
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m_err_msg = (char *)my_realloc(key_memory_Gis_read_stream_err_msg, m_err_msg,
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(uint)len + 1, MYF(MY_ALLOW_ZERO_PTR));
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memcpy(m_err_msg, msg, len + 1);
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}
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