SQLite

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** Memory allocation functions used throughout sqlite.
**
**
** $Id: malloc.c,v 1.3 2007/06/15 20:29:20 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <stdarg.h>
#include <ctype.h>

/*

** function. However, if a malloc() failure has occured since the previous
** invocation SQLITE_NOMEM is returned instead. 
**
** If the first argument, db, is not NULL and a malloc() error has occured,
** then the connection error-code (the value returned by sqlite3_errcode())
** is set to SQLITE_NOMEM.
*/
int sqlite3_mallocHasFailed = 0;
int sqlite3ApiExit(sqlite3* db, int rc){
  if( sqlite3MallocFailed() ){
    sqlite3_mallocHasFailed = 0;
    sqlite3OsLeaveMutex();
    sqlite3Error(db, SQLITE_NOMEM, 0);
    rc = SQLITE_NOMEM;
  }
  return rc & (db ? db->errMask : 0xff);
}

/* 
** Set the "malloc has failed" condition to true for this thread.
*/
void sqlite3FailedMalloc(){
  if( !sqlite3MallocFailed() ){
    sqlite3OsEnterMutex();
    assert( sqlite3_mallocHasFailed==0 );
    sqlite3_mallocHasFailed = 1;
  }
}

#ifdef SQLITE_MEMDEBUG
/*
** This function sets a flag in the thread-specific-data structure that will
** cause an assert to fail if sqliteMalloc() or sqliteRealloc() is called.

 * When testing, this global variable stores the location of the
 * pending-byte in the database file.
 */
#ifdef SQLITE_TEST
unsigned int sqlite3_pending_byte = 0x40000000;
#endif


int sqlite3_os_trace = 0;
#ifdef SQLITE_DEBUG
#define OSTRACE1(X)         if( sqlite3_os_trace ) sqlite3DebugPrintf(X)
#define OSTRACE2(X,Y)       if( sqlite3_os_trace ) sqlite3DebugPrintf(X,Y)
#define OSTRACE3(X,Y,Z)     if( sqlite3_os_trace ) sqlite3DebugPrintf(X,Y,Z)
#define OSTRACE4(X,Y,Z,A)   if( sqlite3_os_trace ) sqlite3DebugPrintf(X,Y,Z,A)
#define OSTRACE5(X,Y,Z,A,B) if( sqlite3_os_trace ) sqlite3DebugPrintf(X,Y,Z,A,B)
#define OSTRACE6(X,Y,Z,A,B,C) \
    if(sqlite3_os_trace) sqlite3DebugPrintf(X,Y,Z,A,B,C)

/*
** 2001 September 15
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.583 2007/08/07 17:13:04 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
#include "sqliteLimit.h"


#if defined(SQLITE_TCL) || defined(TCLSH)

#define sqliteRealloc(x,y)       sqlite3Realloc(x,y)
#define sqliteStrDup(x)          sqlite3StrDup(x)
#define sqliteStrNDup(x,y)       sqlite3StrNDup(x,y)
#define sqliteReallocOrFree(x,y) sqlite3ReallocOrFree(x,y)

#endif

/* Variable sqlite3_mallocHasFailed is set to true after a malloc() 
** failure occurs. 
**
** The sqlite3MallocFailed() macro returns true if a malloc has failed
** in this thread since the last call to sqlite3ApiExit(), or false 
** otherwise.
*/
extern int sqlite3_mallocHasFailed;
#define sqlite3MallocFailed() (sqlite3_mallocHasFailed && sqlite3OsInMutex(1))

#define sqliteFree(x)          sqlite3FreeX(x)
#define sqliteAllocSize(x)     sqlite3AllocSize(x)

/*
** An instance of this structure might be allocated to store information
** specific to a single thread.

#
proc copy_file {filename} {
  global seen_hdr available_hdr out addstatic
  set tail [file tail $filename]
  section_comment "Begin file $tail"
  set in [open $filename r]
  set varpattern {^[a-zA-Z][a-zA-Z_0-9 *]+ \*?(sqlite3[a-zA-Z0-9]+)([[;]| =)}

  if {[file extension $filename]==".h"} {
    set declpattern {^ *[a-zA-Z][a-zA-Z_0-9 ]+ \*?(sqlite3[_A-Z][a-zA-Z0-9]+)\(}
  } else {
    set declpattern {^[a-zA-Z][a-zA-Z_0-9 ]+ \*?(sqlite3[_A-Z][a-zA-Z0-9]+)\(}
  }

  while {![eof $in]} {
    set line [gets $in]
    if {[regexp {^#\s*include\s+["<]([^">]+)[">]} $line all hdr]} {
      if {[info exists available_hdr($hdr)]} {
        if {$available_hdr($hdr)} {
          if {$hdr!="os_common.h"} {
            set available_hdr($hdr) 0