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 02110-1335 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 26 enum 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 45 bool 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 68 bool 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 96 bool 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 } 118 119 120 bool 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 */ 139 140 void 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