src/mem0.c

   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 */