1 /* Copyright (c) 2010, 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 #include <stdlib.h>
25 #include <errno.h>
26 #include <ctype.h>
27 #include <string.h>
28 #include "sql_bootstrap.h"
29
read_bootstrap_query(char * query,size_t * query_length,fgets_input_t input,fgets_fn_t fgets_fn,int * error)30 int read_bootstrap_query(char *query, size_t *query_length,
31 fgets_input_t input, fgets_fn_t fgets_fn, int *error)
32 {
33 char line_buffer[MAX_BOOTSTRAP_LINE_SIZE];
34 const char *line;
35 size_t len;
36 size_t query_len= 0;
37 int fgets_error= 0;
38 *error= 0;
39
40 for ( ; ; )
41 {
42 line= (*fgets_fn)(line_buffer, sizeof(line_buffer), input, &fgets_error);
43
44 if (error)
45 *error= fgets_error;
46
47 if (fgets_error != 0)
48 return READ_BOOTSTRAP_ERROR;
49
50 if (line == NULL)
51 return (query_len == 0) ? READ_BOOTSTRAP_EOF : READ_BOOTSTRAP_ERROR;
52
53 len= strlen(line);
54
55 /*
56 Remove trailing whitespace characters.
57 This assumes:
58 - no multibyte encoded character can be found at the very end of a line,
59 - whitespace characters from the "C" locale only.
60 which is sufficient for the kind of queries found
61 in the bootstrap scripts.
62 */
63 while (len && (isspace(line[len - 1])))
64 len--;
65 /*
66 Cleanly end the string, so we don't have to test len > x
67 all the time before reading line[x], in the code below.
68 */
69 line_buffer[len]= '\0';
70
71 /* Skip blank lines */
72 if (len == 0)
73 continue;
74
75 /* Skip # comments */
76 if (line[0] == '#')
77 continue;
78
79 /* Skip -- comments */
80 if ((line[0] == '-') && (line[1] == '-'))
81 continue;
82
83 /* Skip delimiter, ignored. */
84 if (strncmp(line, "delimiter", 9) == 0)
85 continue;
86
87 /* Append the current line to a multi line query. If the new line will make
88 the query too long, preserve the partial line to provide context for the
89 error message.
90 */
91 if (query_len + len + 1 >= MAX_BOOTSTRAP_QUERY_SIZE)
92 {
93 size_t new_len= MAX_BOOTSTRAP_QUERY_SIZE - query_len - 1;
94 if ((new_len > 0) && (query_len < MAX_BOOTSTRAP_QUERY_SIZE))
95 {
96 memcpy(query + query_len, line, new_len);
97 query_len+= new_len;
98 }
99 query[query_len]= '\0';
100 *query_length= query_len;
101 return READ_BOOTSTRAP_QUERY_SIZE;
102 }
103
104 if (query_len != 0)
105 {
106 /*
107 Append a \n to the current line, if any,
108 to preserve the intended presentation.
109 */
110 query[query_len++]= '\n';
111 }
112 memcpy(query + query_len, line, len);
113 query_len+= len;
114
115 if (line[len - 1] == ';')
116 {
117 /*
118 The last line is terminated by ';'.
119 Return the query found.
120 */
121 query[query_len]= '\0';
122 *query_length= query_len;
123 return READ_BOOTSTRAP_SUCCESS;
124 }
125 }
126 }
127
128