** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.144 2004/06/26 08:38:25 danielk1977 Exp $
*/
#include "os.h"         /* Must be first to enable large file support */
#include "sqliteInt.h"
#include "pager.h"
#include <assert.h>
#include <string.h>

................................................................................
    zFilename = zTemp;
    zFullPathname = sqlite3OsFullPathname(zFilename);
    if( rc==SQLITE_OK ){
      tempFile = 1;
    }
  }
  if( !zFullPathname ){

    return SQLITE_NOMEM;
  }
  if( rc!=SQLITE_OK ){
    sqlite3OsClose(&fd);
    sqliteFree(zFullPathname);
    return rc;
  }

** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.145 2004/06/26 13:51:34 danielk1977 Exp $
*/
#include "os.h"         /* Must be first to enable large file support */
#include "sqliteInt.h"
#include "pager.h"
#include <assert.h>
#include <string.h>

................................................................................
    zFilename = zTemp;
    zFullPathname = sqlite3OsFullPathname(zFilename);
    if( rc==SQLITE_OK ){
      tempFile = 1;
    }
  }
  if( !zFullPathname ){
    sqlite3OsClose(&fd);
    return SQLITE_NOMEM;
  }
  if( rc!=SQLITE_OK ){
    sqlite3OsClose(&fd);
    sqliteFree(zFullPathname);
    return rc;
  }

** the label is resolved to a specific address, the VDBE will scan
** through its operation list and change all values of P2 which match
** the label into the resolved address.
**
** The VDBE knows that a P2 value is a label because labels are
** always negative and P2 values are suppose to be non-negative.
** Hence, a negative P2 value is a label that has yet to be resolved.


*/
int sqlite3VdbeMakeLabel(Vdbe *p){
  int i;
  i = p->nLabel++;
  assert( p->magic==VDBE_MAGIC_INIT );
  if( i>=p->nLabelAlloc ){
    int *aNew;
................................................................................
}

/*
** Clean up and delete a VDBE after execution.  Return an integer which is
** the result code.  Write any error message text into *pzErrMsg.
*/
int sqlite3VdbeFinalize(Vdbe *p){
  int rc;
  sqlite *db;

  if( p->magic!=VDBE_MAGIC_RUN && p->magic!=VDBE_MAGIC_HALT ){

    if( p->magic==VDBE_MAGIC_INIT ){
      sqlite3Error(p->db, SQLITE_MISUSE, 0);
    }
    return SQLITE_MISUSE;
  }
  db = p->db;
  rc = sqlite3VdbeReset(p);
  sqlite3VdbeDelete(p);
  if( rc==SQLITE_SCHEMA ){
    sqlite3ResetInternalSchema(db, 0);
  }
  return rc;
}

** the label is resolved to a specific address, the VDBE will scan
** through its operation list and change all values of P2 which match
** the label into the resolved address.
**
** The VDBE knows that a P2 value is a label because labels are
** always negative and P2 values are suppose to be non-negative.
** Hence, a negative P2 value is a label that has yet to be resolved.
**
** Zero is returned if a malloc() fails.
*/
int sqlite3VdbeMakeLabel(Vdbe *p){
  int i;
  i = p->nLabel++;
  assert( p->magic==VDBE_MAGIC_INIT );
  if( i>=p->nLabelAlloc ){
    int *aNew;
................................................................................
}

/*
** Clean up and delete a VDBE after execution.  Return an integer which is
** the result code.  Write any error message text into *pzErrMsg.
*/
int sqlite3VdbeFinalize(Vdbe *p){
  int rc = SQLITE_OK;
  sqlite *db;

  if( p->magic==VDBE_MAGIC_RUN || p->magic==VDBE_MAGIC_HALT ){
    rc = sqlite3VdbeReset(p);
  }else if( p->magic!=VDBE_MAGIC_INIT ){
    /* sqlite3Error(p->db, SQLITE_MISUSE, 0); */

    return SQLITE_MISUSE;
  }


  sqlite3VdbeDelete(p);
  if( rc==SQLITE_SCHEMA ){
    sqlite3ResetInternalSchema(db, 0);
  }
  return rc;
}

#***********************************************************************
# This file attempts to check the library in an out-of-memory situation.
# When compiled with -DMEMORY_DEBUG=1, the SQLite library accepts a special
# command (sqlite_malloc_fail N) which causes the N-th malloc to fail.  This
# special feature is used to see what happens in the library if a malloc
# were to really fail due to an out-of-memory situation.
#
# $Id: malloc.test,v 1.8 2004/06/19 00:16:31 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Only run these tests if memory debugging is turned on.
#
if {[info command sqlite_malloc_stat]==""} {
................................................................................
     } else {
       set v2 [expr {$msg=="" || $msg=="out of memory"}]
       if {!$v2} {puts "\nError message returned: $msg"}
       lappend v $v2
     }
  } {1 1}
}







set fd [open ./data.tmp w]
for {set i 1} {$i<=20} {incr i} {
  puts $fd "$i\t[expr {$i*$i}]\t[expr {100-$i}]  abcdefghijklmnopqrstuvwxyz"
}
close $fd

................................................................................
     } else {
       set v2 [expr {$msg=="" || $msg=="out of memory"}]
       if {!$v2} {puts "\nError message returned: $msg"}
       lappend v $v2
     }
  } {1 1}
}







for {set go 1; set i 1} {$go} {incr i} {
  do_test malloc-3.$i {
     sqlite_malloc_fail 0
     catch {db close}
     catch {file delete -force test.db}
     catch {file delete -force test.db-journal}
................................................................................
     } else {
       set v2 [expr {$msg=="" || $msg=="out of memory"}]
       if {!$v2} {puts "\nError message returned: $msg"}
       lappend v $v2
     }
  } {1 1}
}







for {set go 1; set i 1} {$go} {incr i} {
  do_test malloc-4.$i {
     sqlite_malloc_fail 0
     catch {db close}
     catch {file delete -force test.db}
     catch {file delete -force test.db-journal}
     sqlite_malloc_fail $i
................................................................................
     } else {
       set v2 [expr {$msg=="" || $msg=="out of memory"}]
       if {!$v2} {puts "\nError message returned: $msg"}
       lappend v $v2
     }
  } {1 1}
}







for {set go 1; set i 1} {$go} {incr i} {
  do_test malloc-5.$i {
     sqlite_malloc_fail 0
     catch {db close}
     catch {file delete -force test.db}
     catch {file delete -force test.db-journal}
     sqlite_malloc_fail $i
................................................................................
     } else {
       set v2 [expr {$msg=="" || $msg=="out of memory"}]
       if {!$v2} {puts "\nError message returned: $msg"}
       lappend v $v2
     }
  } {1 1}
}







sqlite_malloc_fail 0
finish_test

#***********************************************************************
# This file attempts to check the library in an out-of-memory situation.
# When compiled with -DMEMORY_DEBUG=1, the SQLite library accepts a special
# command (sqlite_malloc_fail N) which causes the N-th malloc to fail.  This
# special feature is used to see what happens in the library if a malloc
# were to really fail due to an out-of-memory situation.
#
# $Id: malloc.test,v 1.9 2004/06/26 13:51:34 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Only run these tests if memory debugging is turned on.
#
if {[info command sqlite_malloc_stat]==""} {
................................................................................
     } else {
       set v2 [expr {$msg=="" || $msg=="out of memory"}]
       if {!$v2} {puts "\nError message returned: $msg"}
       lappend v $v2
     }
  } {1 1}
}

# Ensure that no file descriptors were leaked.
do_test malloc-1.X {
  catch {db close}
  set sqlite_open_file_count
} {0}

set fd [open ./data.tmp w]
for {set i 1} {$i<=20} {incr i} {
  puts $fd "$i\t[expr {$i*$i}]\t[expr {100-$i}]  abcdefghijklmnopqrstuvwxyz"
}
close $fd

................................................................................
     } else {
       set v2 [expr {$msg=="" || $msg=="out of memory"}]
       if {!$v2} {puts "\nError message returned: $msg"}
       lappend v $v2
     }
  } {1 1}
}

# Ensure that no file descriptors were leaked.
do_test malloc-2.X {
  catch {db close}
  set sqlite_open_file_count
} {0}

for {set go 1; set i 1} {$go} {incr i} {
  do_test malloc-3.$i {
     sqlite_malloc_fail 0
     catch {db close}
     catch {file delete -force test.db}
     catch {file delete -force test.db-journal}
................................................................................
     } else {
       set v2 [expr {$msg=="" || $msg=="out of memory"}]
       if {!$v2} {puts "\nError message returned: $msg"}
       lappend v $v2
     }
  } {1 1}
}

# Ensure that no file descriptors were leaked.
do_test malloc-3.X {
  catch {db close}
  set sqlite_open_file_count
} {0}

for {set go 1; set i 1} {$go} {incr i} {
  do_test malloc-4.$i {
     sqlite_malloc_fail 0
     catch {db close}
     catch {file delete -force test.db}
     catch {file delete -force test.db-journal}
     sqlite_malloc_fail $i
................................................................................
     } else {
       set v2 [expr {$msg=="" || $msg=="out of memory"}]
       if {!$v2} {puts "\nError message returned: $msg"}
       lappend v $v2
     }
  } {1 1}
}

# Ensure that no file descriptors were leaked.
do_test malloc-4.X {
  catch {db close}
  set sqlite_open_file_count
} {0}

for {set go 1; set i 1} {$go} {incr i} {
  do_test malloc-5.$i {
     sqlite_malloc_fail 0
     catch {db close}
     catch {file delete -force test.db}
     catch {file delete -force test.db-journal}
     sqlite_malloc_fail $i
................................................................................
     } else {
       set v2 [expr {$msg=="" || $msg=="out of memory"}]
       if {!$v2} {puts "\nError message returned: $msg"}
       lappend v $v2
     }
  } {1 1}
}

# Ensure that no file descriptors were leaked.
do_test malloc-5.X {
  catch {db close}
  set sqlite_open_file_count
} {0}

sqlite_malloc_fail 0
finish_test