write-after-read-protocol/sql/gstream.cc at master · FlashSQL/write-after-read-protocol · GitHub

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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,

51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */

Functions to read and parse geometrical data.

NOTE: These functions assumes that the string is end \0 terminated!

#include "gstream.h"

#include "mysql/mysql_lex_string.h" // LEX_STRING

/* key_memory_Gis_read_stream_err_msg */

#include "mysqld.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 \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];

my_stpcpy(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(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);

}

write-after-read-protocol/sql/gstream.cc at master · FlashSQL/write-after-read-protocol · GitHub

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