1 /* Copyright (c) 2012, 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
21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
22
23
24 /*
25 This file provide mysql_string service to plugins.
26 operations on mysql_string can be performed by plugins via these service
27 functions.
28 */
29
30 #include <my_sys.h>
31 #include "string_service.h"
32 #include "mysql/service_mysql_string.h"
33 /* key_memory_string_iterator */
34 #include "mysqld.h"
35 PSI_memory_key key_memory_string_iterator;
36
37 /*
38 This service function converts the mysql_string to the character set
39 specified by charset_name parameter.
40 */
41 extern "C"
mysql_string_convert_to_char_ptr(mysql_string_handle string_handle,const char * charset_name,char * buffer,unsigned int buffer_size,int * error)42 int mysql_string_convert_to_char_ptr(mysql_string_handle string_handle,
43 const char *charset_name,
44 char *buffer,
45 unsigned int buffer_size,
46 int *error)
47 {
48 String *str= (String *) string_handle;
49 int len= (int)my_convert(buffer, buffer_size - 1, &my_charset_utf8_general_ci,
50 str->ptr(), str->length(), str->charset(),
51 (uint*) error);
52 buffer[len]= '\0';
53 return (len);
54 }
55
56 /*
57 This service function deallocates the mysql_string_handle allocated on
58 server and used in plugins.
59 */
60 extern "C"
mysql_string_free(mysql_string_handle string_handle)61 void mysql_string_free(mysql_string_handle string_handle)
62 {
63 String *str= (String *) string_handle;
64 str->mem_free();
65 delete [] str;
66 }
67
68 /*
69 This service function deallocates the mysql_string_iterator_handle
70 allocated on server and used in plugins.
71 */
72 extern "C"
mysql_string_iterator_free(mysql_string_iterator_handle iterator_handle)73 void mysql_string_iterator_free(mysql_string_iterator_handle iterator_handle)
74 {
75 my_free((string_iterator *) iterator_handle);
76 }
77
78 /* This service function allocate mysql_string_iterator_handle and return it */
79 extern "C"
mysql_string_get_iterator(mysql_string_handle string_handle)80 mysql_string_iterator_handle mysql_string_get_iterator(mysql_string_handle
81 string_handle)
82 {
83 String *str= (String *) string_handle;
84 string_iterator *iterator= (string_iterator *) my_malloc(key_memory_string_iterator,
85 sizeof
86 (struct st_string_iterator), MYF(0));
87 iterator->iterator_str= str;
88 iterator->iterator_ptr= str->ptr();
89 iterator->ctype= 0;
90 return (iterator);
91 }
92
93 /* Provide service which returns the next mysql_string_iterator_handle */
94 extern "C"
mysql_string_iterator_next(mysql_string_iterator_handle iterator_handle)95 int mysql_string_iterator_next(mysql_string_iterator_handle iterator_handle)
96 {
97 int char_len, char_type, tmp_len;
98 string_iterator *iterator= (string_iterator *) iterator_handle;
99 String *str= iterator->iterator_str;
100 const CHARSET_INFO *cs= str->charset();
101 char *end= (char*) str->ptr() + str->length();
102 if (iterator->iterator_ptr >= (const char*) end)
103 return (0);
104 char_len= (cs->cset->ctype(cs, &char_type, (uchar*) iterator->iterator_ptr,
105 (uchar*) end));
106 iterator->ctype= char_type;
107 tmp_len= (char_len > 0 ? char_len : (char_len < 0 ? -char_len : 1));
108 if(iterator->iterator_ptr+tmp_len > end)
109 return (0);
110 else
111 iterator->iterator_ptr+= tmp_len;
112 return (1);
113 }
114
115 /*
116 Provide service which calculate weather the current iterator_ptr points to
117 upper case character or not
118 */
119 extern "C"
mysql_string_iterator_isupper(mysql_string_iterator_handle iterator_handle)120 int mysql_string_iterator_isupper(mysql_string_iterator_handle iterator_handle)
121 {
122 string_iterator *iterator= (string_iterator *) iterator_handle;
123 return (iterator->ctype & _MY_U);
124 }
125
126 /*
127 Provide service which calculate weather the current iterator_ptr points to
128 lower case character or not
129 */
130 extern "C"
mysql_string_iterator_islower(mysql_string_iterator_handle iterator_handle)131 int mysql_string_iterator_islower(mysql_string_iterator_handle iterator_handle)
132 {
133 string_iterator *iterator= (string_iterator *) iterator_handle;
134 return (iterator->ctype & _MY_L);
135 }
136
137 /*
138 Provide service which calculate weather the current iterator_ptr points to
139 digit or not
140 */
141 extern "C"
mysql_string_iterator_isdigit(mysql_string_iterator_handle iterator_handle)142 int mysql_string_iterator_isdigit(mysql_string_iterator_handle iterator_handle)
143 {
144 string_iterator *iterator= (string_iterator *) iterator_handle;
145 return (iterator->ctype & _MY_NMR);
146 }
147
148 /*
149 This function provide plugin service to convert a String pointed by handle to
150 lower case. Conversion depends on the client character set info
151 */
152 extern "C"
mysql_string_to_lowercase(mysql_string_handle string_handle)153 mysql_string_handle mysql_string_to_lowercase(mysql_string_handle string_handle)
154 {
155 String *str= (String *) string_handle;
156 String *res= new String[1];
157 const CHARSET_INFO *cs= str->charset();
158 if (cs->casedn_multiply == 1)
159 {
160 res->copy(*str);
161 my_casedn_str(cs, res->c_ptr_quick());
162 }
163 else
164 {
165 size_t len= str->length() * cs->casedn_multiply;
166 res->set_charset(cs);
167 res->alloc(len);
168 len= cs->cset->casedn(cs, (char*) str->ptr(), str->length(), (char *) res->ptr(), len);
169 res->length(len);
170 }
171 return (res);
172 }
173