1/* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
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 as published by
5 the Free Software Foundation; version 2 of the License.
6
7 This program is distributed in the hope that it will be useful,
8 but WITHOUT ANY WARRANTY; without even the implied warranty of
9 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 GNU General Public License for more details.
11
12 You should have received a copy of the GNU General Public License
13 along with this program; if not, write to the Free Software
14 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
15
16/*
17 Functions to read and parse geometrical data.
18 NOTE: These functions assumes that the string is end \0 terminated!
19*/
20
21#include "mariadb.h"
22#include "sql_priv.h"
23#include "gstream.h"
24#include "m_string.h" // LEX_STRING
25
26enum Gis_read_stream::enum_tok_types Gis_read_stream::get_next_toc_type()
27{
28 skip_space();
29 if (m_cur >= m_limit)
30 return eostream;
31 if (my_isvar_start(&my_charset_bin, *m_cur))
32 return word;
33 if ((*m_cur >= '0' && *m_cur <= '9') || *m_cur == '-' || *m_cur == '+')
34 return numeric;
35 if (*m_cur == '(')
36 return l_bra;
37 if (*m_cur == ')')
38 return r_bra;
39 if (*m_cur == ',')
40 return comma;
41 return unknown;
42}
43
44
45bool Gis_read_stream::lookup_next_word(LEX_STRING *res)
46{
47 const char *cur= m_cur;
48
49 skip_space();
50 res->str= (char*) cur;
51 /* The following will also test for \0 */
52 if ((cur >= m_limit) || !my_isvar_start(&my_charset_bin, *cur))
53 return 1;
54
55 /*
56 We can't combine the following increment with my_isvar() because
57 my_isvar() is a macro that would cause side effects
58 */
59 cur++;
60 while ((cur < m_limit) && my_isvar(&my_charset_bin, *cur))
61 cur++;
62
63 res->length= (uint32) (cur - res->str);
64 return 0;
65}
66
67
68bool Gis_read_stream::get_next_word(LEX_STRING *res)
69{
70 skip_space();
71 res->str= (char*) m_cur;
72 /* The following will also test for \0 */
73 if ((m_cur >= m_limit) || !my_isvar_start(&my_charset_bin, *m_cur))
74 return 1;
75
76 /*
77 We can't combine the following increment with my_isvar() because
78 my_isvar() is a macro that would cause side effects
79 */
80 m_cur++;
81 while ((m_cur < m_limit) && my_isvar(&my_charset_bin, *m_cur))
82 m_cur++;
83
84 res->length= (uint32) (m_cur - res->str);
85 return 0;
86}
87
88
89/*
90 Read a floating point number
91
92 NOTE: Number must start with a digit or sign. It can't start with a decimal
93 point
94*/
95
96bool Gis_read_stream::get_next_number(double *d)
97{
98 char *endptr;
99 int err;
100
101 skip_space();
102
103 if ((m_cur >= m_limit) ||
104 ((*m_cur < '0' || *m_cur > '9') && *m_cur != '-' && *m_cur != '+'))
105 {
106 set_error_msg("Numeric constant expected");
107 return 1;
108 }
109
110 *d = my_strntod(m_charset, (char *)m_cur,
111 (uint) (m_limit-m_cur), &endptr, &err);
112 if (err)
113 return 1;
114 if (endptr)
115 m_cur = endptr;
116 return 0;
117}
118
119
120bool Gis_read_stream::check_next_symbol(char symbol)
121{
122 skip_space();
123 if ((m_cur >= m_limit) || (*m_cur != symbol))
124 {
125 char buff[32];
126 strmov(buff, "'?' expected");
127 buff[2]= symbol;
128 set_error_msg(buff);
129 return 1;
130 }
131 m_cur++;
132 return 0;
133}
134
135
136/*
137 Remember error message.
138*/
139
140void Gis_read_stream::set_error_msg(const char *msg)
141{
142 size_t len= strlen(msg); // ok in this context
143 m_err_msg= (char *) my_realloc(m_err_msg, (uint) len + 1, MYF(MY_ALLOW_ZERO_PTR));
144 memcpy(m_err_msg, msg, len + 1);
145}
146