1 /* Copyright (c) 2002, 2021, Oracle and/or its affiliates.
2
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License, version 2.0,
5 as published by the Free Software Foundation.
6
7 This program is also distributed with certain software (including
8 but not limited to OpenSSL) that is licensed under separate terms,
9 as designated in a particular file or component or in included license
10 documentation. The authors of MySQL hereby grant you an additional
11 permission to link the program and your derivative works with the
12 separately licensed software that they have included with MySQL.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License, version 2.0, for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software Foundation,
21 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
22
23 /*
24 Functions to read and parse geometrical data.
25 NOTE: These functions assumes that the string is end \0 terminated!
26 */
27
28 #include "gstream.h"
29 #include "mysql/mysql_lex_string.h" // LEX_STRING
30 /* key_memory_Gis_read_stream_err_msg */
31 #include "mysqld.h"
32
get_next_toc_type()33 enum Gis_read_stream::enum_tok_types Gis_read_stream::get_next_toc_type()
34 {
35 skip_space();
36 if (m_cur >= m_limit)
37 return eostream;
38 if (my_isvar_start(&my_charset_bin, *m_cur))
39 return word;
40 if ((*m_cur >= '0' && *m_cur <= '9') || *m_cur == '-' || *m_cur == '+')
41 return numeric;
42 if (*m_cur == '(')
43 return l_bra;
44 if (*m_cur == ')')
45 return r_bra;
46 if (*m_cur == ',')
47 return comma;
48 return unknown;
49 }
50
51
get_next_word(LEX_STRING * res)52 bool Gis_read_stream::get_next_word(LEX_STRING *res)
53 {
54 skip_space();
55 res->str= (char*) m_cur;
56 /* The following will also test for \0 */
57 if ((m_cur >= m_limit) || !my_isvar_start(&my_charset_bin, *m_cur))
58 return 1;
59
60 /*
61 We can't combine the following increment with my_isvar() because
62 my_isvar() is a macro that would cause side effects
63 */
64 m_cur++;
65 while ((m_cur < m_limit) && my_isvar(&my_charset_bin, *m_cur))
66 m_cur++;
67
68 res->length= (uint32) (m_cur - res->str);
69 return 0;
70 }
71
72
73 /*
74 Read a floating point number
75
76 NOTE: Number must start with a digit or sign. It can't start with a decimal
77 point
78 */
79
get_next_number(double * d)80 bool Gis_read_stream::get_next_number(double *d)
81 {
82 char *endptr;
83 int err;
84
85 skip_space();
86
87 if ((m_cur >= m_limit) ||
88 ((*m_cur < '0' || *m_cur > '9') && *m_cur != '-' && *m_cur != '+'))
89 {
90 set_error_msg("Numeric constant expected");
91 return 1;
92 }
93
94 *d = my_strntod(m_charset, (char *)m_cur,
95 (uint) (m_limit-m_cur), &endptr, &err);
96 if (err)
97 return 1;
98 if (endptr)
99 m_cur = endptr;
100 return 0;
101 }
102
103
check_next_symbol(char symbol)104 bool Gis_read_stream::check_next_symbol(char symbol)
105 {
106 skip_space();
107 if ((m_cur >= m_limit) || (*m_cur != symbol))
108 {
109 char buff[32];
110 my_stpcpy(buff, "'?' expected");
111 buff[2]= symbol;
112 set_error_msg(buff);
113 return 1;
114 }
115 m_cur++;
116 return 0;
117 }
118
119
120 /*
121 Remember error message.
122 */
123
set_error_msg(const char * msg)124 void Gis_read_stream::set_error_msg(const char *msg)
125 {
126 size_t len= strlen(msg); // ok in this context
127 m_err_msg= (char *) my_realloc(key_memory_Gis_read_stream_err_msg,
128 m_err_msg, (uint) len + 1, MYF(MY_ALLOW_ZERO_PTR));
129 memcpy(m_err_msg, msg, len + 1);
130 }
131