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/* 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; version 2 of the License.
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 \0 terminated!
*/
#include "sql_priv.h"
#include "gstream.h"
#include "m_string.h" // LEX_STRING
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 \0 */
if ((m_cur >= m_limit) || !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,
(uint) (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, (uint) len + 1, MYF(MY_ALLOW_ZERO_PTR));
memcpy(m_err_msg, msg, len + 1);
}
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