gstream.cpp
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /* Copyright (C) 2004 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- 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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- /*
- Functions to read and parse geometrical data.
- NOTE: These functions assumes that the string is end terminated!
- */
- #include "mysql_priv.h"
- 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 ((*m_cur >= '0' && *m_cur <= '9') || *m_cur == '-' || *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_STRING *res)
- {
- skip_space();
- res->str= (char*) m_cur;
- /* The following will also test for */
- if (!my_isvar_start(&my_charset_bin, *m_cur))
- return 1;
- /*
- 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 0;
- }
- /*
- Read a floating point number
- NOTE: Number must start with a digit or sign. It can't start with a decimal
- point
- */
- bool Gis_read_stream::get_next_number(double *d)
- {
- char *endptr;
- int err;
- skip_space();
- if ((m_cur >= m_limit) ||
- (*m_cur < '0' || *m_cur > '9') && *m_cur != '-' && *m_cur != '+')
- {
- set_error_msg("Numeric constant expected");
- return 1;
- }
- *d = my_strntod(m_charset, (char *)m_cur,
- m_limit-m_cur, &endptr, &err);
- if (err)
- return 1;
- if (endptr)
- m_cur = endptr;
- return 0;
- }
- bool Gis_read_stream::check_next_symbol(char symbol)
- {
- skip_space();
- if ((m_cur >= m_limit) || (*m_cur != symbol))
- {
- char buff[32];
- strmov(buff, "'?' expected");
- buff[2]= symbol;
- set_error_msg(buff);
- return 1;
- }
- m_cur++;
- return 0;
- }
- /*
- 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(m_err_msg, len + 1, MYF(MY_ALLOW_ZERO_PTR));
- memcpy(m_err_msg, msg, len + 1);
- }