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/* Copyright (c) 2002, 2025, 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 designed to work 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 either included with
the program or referenced in the documentation.
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 */
/*
Functions to read and parse geometrical data.
NOTE: These functions assumes that the string is end \0 terminated!
*/
#include "sql/gstream.h"
#include <string.h>
#include <sys/types.h>
#include "m_string.h" // my_stpcpy
#include "my_inttypes.h"
#include "my_sys.h"
#include "sql/psi_memory_key.h"
static inline bool is_numeric_beginning(const char *pc, const size_t len) {
return (pc != nullptr &&
((*pc >= '0' && *pc <= '9') || *pc == '-' || *pc == '+' ||
(*pc == '.' && len > 1 && pc[1] >= '0' && pc[1] <= '9')));
}
enum Gis_read_stream::enum_tok_types Gis_read_stream::get_next_toc_type() {
skip_space();
if (m_cur >= m_limit) return eostream;
if (my_isvar_start(&my_charset_bin, *m_cur)) return word;
if (is_numeric_beginning(m_cur, m_limit - m_cur)) return numeric;
if (*m_cur == '(') return l_bra;
if (*m_cur == ')') return r_bra;
if (*m_cur == ',') return comma;
return unknown;
}
bool Gis_read_stream::get_next_word(LEX_CSTRING *res) {
skip_space();
res->str = m_cur;
/* The following will also test for \0 */
if ((m_cur >= m_limit) || !my_isvar_start(&my_charset_bin, *m_cur))
return true;
/*
We can't combine the following increment with my_isvar() because
my_isvar() is a macro that would cause side effects
*/
m_cur++;
while ((m_cur < m_limit) && my_isvar(&my_charset_bin, *m_cur)) m_cur++;
res->length = (uint32)(m_cur - res->str);
return false;
}
/* Read a floating point number. */
bool Gis_read_stream::get_next_number(double *d) {
const char *endptr;
int err;
skip_space();
if ((m_cur >= m_limit) || !is_numeric_beginning(m_cur, m_limit - m_cur)) {
set_error_msg("Numeric constant expected");
return true;
}
*d = my_strntod(m_charset, m_cur, (uint)(m_limit - m_cur), &endptr, &err);
if (err) return true;
if (endptr) m_cur = endptr;
return false;
}
bool Gis_read_stream::check_next_symbol(char symbol) {
skip_space();
if ((m_cur >= m_limit) || (*m_cur != symbol)) {
char buff[32];
my_stpcpy(buff, "'?' expected");
buff[2] = symbol;
set_error_msg(buff);
return true;
}
m_cur++;
return false;
}
/*
Remember error message.
*/
void Gis_read_stream::set_error_msg(const char *msg) {
size_t len = strlen(msg); // ok in this context
m_err_msg = (char *)my_realloc(key_memory_Gis_read_stream_err_msg, m_err_msg,
(uint)len + 1, MYF(MY_ALLOW_ZERO_PTR));
memcpy(m_err_msg, msg, len + 1);
}
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