1 | /* |
2 | ** 2008 October 28 |
3 | ** |
4 | ** The author disclaims copyright to this source code. In place of |
5 | ** a legal notice, here is a blessing: |
6 | ** |
7 | ** May you do good and not evil. |
8 | ** May you find forgiveness for yourself and forgive others. |
9 | ** May you share freely, never taking more than you give. |
10 | ** |
11 | ************************************************************************* |
12 | ** |
13 | ** This file contains a no-op memory allocation drivers for use when |
14 | ** SQLITE_ZERO_MALLOC is defined. The allocation drivers implemented |
15 | ** here always fail. SQLite will not operate with these drivers. These |
16 | ** are merely placeholders. Real drivers must be substituted using |
17 | ** sqlite3_config() before SQLite will operate. |
18 | */ |
19 | #include "sqliteInt.h" |
20 | |
21 | /* |
22 | ** This version of the memory allocator is the default. It is |
23 | ** used when no other memory allocator is specified using compile-time |
24 | ** macros. |
25 | */ |
26 | #ifdef SQLITE_ZERO_MALLOC |
27 | |
28 | /* |
29 | ** No-op versions of all memory allocation routines |
30 | */ |
31 | static void *sqlite3MemMalloc(int nByte){ return 0; } |
32 | static void sqlite3MemFree(void *pPrior){ return; } |
33 | static void *sqlite3MemRealloc(void *pPrior, int nByte){ return 0; } |
34 | static int sqlite3MemSize(void *pPrior){ return 0; } |
35 | static int sqlite3MemRoundup(int n){ return n; } |
36 | static int sqlite3MemInit(void *NotUsed){ return SQLITE_OK; } |
37 | static void sqlite3MemShutdown(void *NotUsed){ return; } |
38 | |
39 | /* |
40 | ** This routine is the only routine in this file with external linkage. |
41 | ** |
42 | ** Populate the low-level memory allocation function pointers in |
43 | ** sqlite3GlobalConfig.m with pointers to the routines in this file. |
44 | */ |
45 | void sqlite3MemSetDefault(void){ |
46 | static const sqlite3_mem_methods defaultMethods = { |
47 | sqlite3MemMalloc, |
48 | sqlite3MemFree, |
49 | sqlite3MemRealloc, |
50 | sqlite3MemSize, |
51 | sqlite3MemRoundup, |
52 | sqlite3MemInit, |
53 | sqlite3MemShutdown, |
54 | 0 |
55 | }; |
56 | sqlite3_config(SQLITE_CONFIG_MALLOC, &defaultMethods); |
57 | } |
58 | |
59 | #endif /* SQLITE_ZERO_MALLOC */ |
60 | |