** This file contains the C functions that implement date and time
** functions for SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterDateTimeFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: date.c,v 1.1 2003/11/01 01:53:54 drh Exp $
**
** NOTES:
**
** SQLite processes all times and dates as Julian Day numbers.  The
** dates and times are stored as the number of days since noon
** in Greenwich on November 24, 4714 B.C. according to the Gregorian
** calendar system.
................................................................................
    if( sqliteOsCurrentTime(&r)==0 ){
      p->rJD = r;
      p->validJD = 1;
      return 0;
    }
    return 1;
  }else if( sqliteIsNumber(zDate) ){
    p->rJD = atof(zDate);
    p->validJD = 1;
    return 0;
  }
  return 1;
}

/*

** This file contains the C functions that implement date and time
** functions for SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterDateTimeFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: date.c,v 1.2 2003/12/23 02:17:35 drh Exp $
**
** NOTES:
**
** SQLite processes all times and dates as Julian Day numbers.  The
** dates and times are stored as the number of days since noon
** in Greenwich on November 24, 4714 B.C. according to the Gregorian
** calendar system.
................................................................................
    if( sqliteOsCurrentTime(&r)==0 ){
      p->rJD = r;
      p->validJD = 1;
      return 0;
    }
    return 1;
  }else if( sqliteIsNumber(zDate) ){
    p->rJD = sqliteAtoF(zDate);
    p->validJD = 1;
    return 0;
  }
  return 1;
}

/*

** This file contains the C functions that implement various SQL
** functions of SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.33 2003/11/01 01:53:54 drh Exp $
*/
#include <ctype.h>
#include <math.h>
#include <stdlib.h>
#include <assert.h>
#include "sqliteInt.h"
#include "os.h"
................................................................................
  double r;
  char zBuf[100];
  assert( argc==1 || argc==2 );
  if( argv[0]==0 || (argc==2 && argv[1]==0) ) return;
  n = argc==2 ? atoi(argv[1]) : 0;
  if( n>30 ) n = 30;
  if( n<0 ) n = 0;
  r = atof(argv[0]);
  sprintf(zBuf,"%.*f",n,r);
  sqlite_set_result_string(context, zBuf, -1);
}

/*
** Implementation of the upper() and lower() SQL functions.
*/
................................................................................
** Routines used to compute the sum or average.
*/
static void sumStep(sqlite_func *context, int argc, const char **argv){
  SumCtx *p;
  if( argc<1 ) return;
  p = sqlite_aggregate_context(context, sizeof(*p));
  if( p && argv[0] ){
    p->sum += atof(argv[0]);
    p->cnt++;
  }
}
static void sumFinalize(sqlite_func *context){
  SumCtx *p;
  p = sqlite_aggregate_context(context, sizeof(*p));
  sqlite_set_result_double(context, p ? p->sum : 0.0);
................................................................................
*/
static void stdDevStep(sqlite_func *context, int argc, const char **argv){
  StdDevCtx *p;
  double x;
  if( argc<1 ) return;
  p = sqlite_aggregate_context(context, sizeof(*p));
  if( p && argv[0] ){
    x = atof(argv[0]);
    p->sum += x;
    p->sum2 += x*x;
    p->cnt++;
  }
}
static void stdDevFinalize(sqlite_func *context){
  double rN = sqlite_aggregate_count(context);

** This file contains the C functions that implement various SQL
** functions of SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.34 2003/12/23 02:17:35 drh Exp $
*/
#include <ctype.h>
#include <math.h>
#include <stdlib.h>
#include <assert.h>
#include "sqliteInt.h"
#include "os.h"
................................................................................
  double r;
  char zBuf[100];
  assert( argc==1 || argc==2 );
  if( argv[0]==0 || (argc==2 && argv[1]==0) ) return;
  n = argc==2 ? atoi(argv[1]) : 0;
  if( n>30 ) n = 30;
  if( n<0 ) n = 0;
  r = sqliteAtoF(argv[0]);
  sprintf(zBuf,"%.*f",n,r);
  sqlite_set_result_string(context, zBuf, -1);
}

/*
** Implementation of the upper() and lower() SQL functions.
*/
................................................................................
** Routines used to compute the sum or average.
*/
static void sumStep(sqlite_func *context, int argc, const char **argv){
  SumCtx *p;
  if( argc<1 ) return;
  p = sqlite_aggregate_context(context, sizeof(*p));
  if( p && argv[0] ){
    p->sum += sqliteAtoF(argv[0]);
    p->cnt++;
  }
}
static void sumFinalize(sqlite_func *context){
  SumCtx *p;
  p = sqlite_aggregate_context(context, sizeof(*p));
  sqlite_set_result_double(context, p ? p->sum : 0.0);
................................................................................
*/
static void stdDevStep(sqlite_func *context, int argc, const char **argv){
  StdDevCtx *p;
  double x;
  if( argc<1 ) return;
  p = sqlite_aggregate_context(context, sizeof(*p));
  if( p && argv[0] ){
    x = sqliteAtoF(argv[0]);
    p->sum += x;
    p->sum2 += x*x;
    p->cnt++;
  }
}
static void stdDevFinalize(sqlite_func *context){
  double rN = sqlite_aggregate_count(context);

  zNew = malloc( sMprintf.nChar+1 );
  if( zNew ) strcpy(zNew,sMprintf.zText);
  if( sMprintf.zText!=sMprintf.zBase ){
    sqliteFree(sMprintf.zText);
  }
  return zNew;
}










































/*
** The following four routines implement the varargs versions of the
** sqlite_exec() and sqlite_get_table() interfaces.  See the sqlite.h
** header files for a more detailed description of how these interfaces
** work.
**

  zNew = malloc( sMprintf.nChar+1 );
  if( zNew ) strcpy(zNew,sMprintf.zText);
  if( sMprintf.zText!=sMprintf.zBase ){
    sqliteFree(sMprintf.zText);
  }
  return zNew;
}

/* 
** This function implements the callback from vxprintf. 
**
** This routine add nNewChar characters of text in zNewText to
** the sgMprintf structure pointed to by "arg".  Unlike mout() above,
** this routine does not allocate new space when the buffer fills.
** It just truncates.
*/
static void sout(void *arg, char *zNewText, int nNewChar){
  struct sgMprintf *pM = (struct sgMprintf*)arg;
  if( pM->nChar + nNewChar + 1 > pM->nAlloc ){
    nNewChar = pM->nAlloc - pM->nChar - 1;
    if( nNewChar<=0 ) return;
  }
  memcpy(&pM->zText[pM->nChar], zNewText, nNewChar);
  pM->nChar += nNewChar;
  pM->zText[pM->nChar] = 0;
}

/*
** sqlite_sprintf() works like sprintf() except that it ignores the
** current locale settings.  This is important for SQLite because we
** are not able to use a "," as the decimal point in place of "." as
** specified by some locales.
*/
int sqlite_snprintf(int n, char *zBuf, const char *zFormat, ...){
  va_list ap;
  struct sgMprintf sMprintf;

  sMprintf.nChar = 0;
  sMprintf.nAlloc = n;
  sMprintf.zText = zBuf;
  sMprintf.zBase = zBuf;
  va_start(ap,zFormat);
  vxprintf(sout,&sMprintf,zFormat,ap);
  va_end(ap);
  return sMprintf.nChar;
}



/*
** The following four routines implement the varargs versions of the
** sqlite_exec() and sqlite_get_table() interfaces.  See the sqlite.h
** header files for a more detailed description of how these interfaces
** work.
**

**    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 1.204 2003/12/07 00:24:35 drh Exp $
*/
#include "config.h"
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"
................................................................................
                       int mode, int nPg, Btree **ppBtree);
int sqliteFixInit(DbFixer*, Parse*, int, const char*, const Token*);
int sqliteFixSrcList(DbFixer*, SrcList*);
int sqliteFixSelect(DbFixer*, Select*);
int sqliteFixExpr(DbFixer*, Expr*);
int sqliteFixExprList(DbFixer*, ExprList*);
int sqliteFixTriggerStep(DbFixer*, TriggerStep*);

**    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 1.205 2003/12/23 02:17:35 drh Exp $
*/
#include "config.h"
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"
................................................................................
                       int mode, int nPg, Btree **ppBtree);
int sqliteFixInit(DbFixer*, Parse*, int, const char*, const Token*);
int sqliteFixSrcList(DbFixer*, SrcList*);
int sqliteFixSelect(DbFixer*, Select*);
int sqliteFixExpr(DbFixer*, Expr*);
int sqliteFixExprList(DbFixer*, ExprList*);
int sqliteFixTriggerStep(DbFixer*, TriggerStep*);
double sqliteAtoF(const char *z);
int sqlite_snprintf(int,char*,const char*,...);

**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing the printf() interface to SQLite.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test1.c,v 1.28 2003/09/06 22:18:08 drh Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include "os.h"
#include <stdlib.h>
#include <string.h>

................................................................................
      sqlite_set_result_string(context, argv[1], -1);
    }else if( argv[1]==0 ){
      sqlite_set_result_error(context, "2nd argument may not be NULL if the "
         "first argument is not \"string\"", -1);
    }else if( sqliteStrICmp(argv[0],"int")==0 ){
      sqlite_set_result_int(context, atoi(argv[1]));
    }else if( sqliteStrICmp(argv[0],"double")==0 ){
      sqlite_set_result_double(context, atof(argv[1]));
    }else{
      sqlite_set_result_error(context,"first argument should be one of: "
          "string int double", -1);
    }
    argc -= 2;
    argv += 2;
  }

**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing the printf() interface to SQLite.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test1.c,v 1.29 2003/12/23 02:17:35 drh Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include "os.h"
#include <stdlib.h>
#include <string.h>

................................................................................
      sqlite_set_result_string(context, argv[1], -1);
    }else if( argv[1]==0 ){
      sqlite_set_result_error(context, "2nd argument may not be NULL if the "
         "first argument is not \"string\"", -1);
    }else if( sqliteStrICmp(argv[0],"int")==0 ){
      sqlite_set_result_int(context, atoi(argv[1]));
    }else if( sqliteStrICmp(argv[0],"double")==0 ){
      sqlite_set_result_double(context, sqliteAtoF(argv[1]));
    }else{
      sqlite_set_result_error(context,"first argument should be one of: "
          "string int double", -1);
    }
    argc -= 2;
    argv += 2;
  }

*************************************************************************
** An tokenizer for SQL
**
** This file contains C code that splits an SQL input string up into
** individual tokens and sends those tokens one-by-one over to the
** parser for analysis.
**
** $Id: tokenize.c,v 1.65 2003/12/06 21:43:56 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include <stdlib.h>

/*
................................................................................
** This function looks up an identifier to determine if it is a
** keyword.  If it is a keyword, the token code of that keyword is 
** returned.  If the input is not a keyword, TK_ID is returned.
*/
int sqliteKeywordCode(const char *z, int n){
  int h;
  Keyword *p;
  if( aKeywordTable[0].len==0 ){

    /* Initialize the keyword hash table */
    sqliteOsEnterMutex();
    if( aKeywordTable[0].len==0 ){

      int i;
      int n;
      n = sizeof(aKeywordTable)/sizeof(aKeywordTable[0]);
      for(i=0; i<n; i++){
        aKeywordTable[i].len = strlen(aKeywordTable[i].zName);
        h = sqliteHashNoCase(aKeywordTable[i].zName, aKeywordTable[i].len);
        h %= KEY_HASH_SIZE;
        aKeywordTable[i].pNext = apHashTable[h];
        apHashTable[h] = &aKeywordTable[i];
      }

    }
    sqliteOsLeaveMutex();
  }
  h = sqliteHashNoCase(z, n) % KEY_HASH_SIZE;
  for(p=apHashTable[h]; p; p=p->pNext){
    if( p->len==n && sqliteStrNICmp(p->zName, z, n)==0 ){
      return p->tokenType;

*************************************************************************
** An tokenizer for SQL
**
** This file contains C code that splits an SQL input string up into
** individual tokens and sends those tokens one-by-one over to the
** parser for analysis.
**
** $Id: tokenize.c,v 1.66 2003/12/23 02:17:35 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include <stdlib.h>

/*
................................................................................
** This function looks up an identifier to determine if it is a
** keyword.  If it is a keyword, the token code of that keyword is 
** returned.  If the input is not a keyword, TK_ID is returned.
*/
int sqliteKeywordCode(const char *z, int n){
  int h;
  Keyword *p;
  static char needInit = 1;
  if( needInit ){
    /* Initialize the keyword hash table */
    sqliteOsEnterMutex();

    if( needInit ){
      int i;
      int n;
      n = sizeof(aKeywordTable)/sizeof(aKeywordTable[0]);
      for(i=0; i<n; i++){
        aKeywordTable[i].len = strlen(aKeywordTable[i].zName);
        h = sqliteHashNoCase(aKeywordTable[i].zName, aKeywordTable[i].len);
        h %= KEY_HASH_SIZE;
        aKeywordTable[i].pNext = apHashTable[h];
        apHashTable[h] = &aKeywordTable[i];
      }
      needInit = 0;
    }
    sqliteOsLeaveMutex();
  }
  h = sqliteHashNoCase(z, n) % KEY_HASH_SIZE;
  for(p=apHashTable[h]; p; p=p->pNext){
    if( p->len==n && sqliteStrNICmp(p->zName, z, n)==0 ){
      return p->tokenType;

**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.68 2003/10/22 22:15:28 drh Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>
#include <ctype.h>

/*
** If malloc() ever fails, this global variable gets set to 1.
................................................................................
    z++;
    if( *z=='+' || *z=='-' ) z++;
    if( !isdigit(*z) ) return 0;
    while( isdigit(*z) ){ z++; }
  }
  return *z==0;
}
































































/* This comparison routine is what we use for comparison operations
** between numeric values in an SQL expression.  "Numeric" is a little
** bit misleading here.  What we mean is that the strings have a
** type of "numeric" from the point of view of SQL.  The strings
** do not necessarily contain numbers.  They could contain text.
**
................................................................................
  isNumA = sqliteIsNumber(atext);
  isNumB = sqliteIsNumber(btext);
  if( isNumA ){
    if( !isNumB ){
      result = -1;
    }else{
      double rA, rB;
      rA = atof(atext);
      rB = atof(btext);
      if( rA<rB ){
        result = -1;
      }else if( rA>rB ){
        result = +1;
      }else{
        result = 0;
      }
................................................................................
      isNumB = sqliteIsNumber(&b[1]);
      if( isNumA ){
        double rA, rB;
        if( !isNumB ){
          res = -1;
          break;
        }
        rA = atof(&a[1]);
        rB = atof(&b[1]);
        if( rA<rB ){
          res = -1;
          break;
        }
        if( rA>rB ){
          res = +1;
          break;

**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.69 2003/12/23 02:17:35 drh Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>
#include <ctype.h>

/*
** If malloc() ever fails, this global variable gets set to 1.
................................................................................
    z++;
    if( *z=='+' || *z=='-' ) z++;
    if( !isdigit(*z) ) return 0;
    while( isdigit(*z) ){ z++; }
  }
  return *z==0;
}

/*
** The string z[] is an ascii representation of a real number.
** Convert this string to a double.
**
** This routine assumes that z[] really is a valid number.  If it
** is not, the result is undefined.
**
** This routine is used instead of the library atof() function because
** the library atof() might want to use "," as the decimal point instead
** of "." depending on how locale is set.  But that would cause problems
** for SQL.  So this routine always uses "." regardless of locale.
*/
double sqliteAtoF(const char *z){
  int sign = 1;
  double v1 = 0.0;
  if( *z=='-' ){
    sign = -1;
    z++;
  }else if( *z=='+' ){
    z++;
  }
  while( isdigit(*z) ){
    v1 = v1*10.0 + (*z - '0');
    z++;
  }
  if( *z=='.' ){
    double divisor = 1.0;
    z++;
    while( isdigit(*z) ){
      v1 = v1*10.0 + (*z - '0');
      divisor *= 10.0;
      z++;
    }
    v1 /= divisor;
  }
  if( *z=='e' || *z=='E' ){
    int esign = 1;
    int eval = 0;
    double scale = 1.0;
    z++;
    if( *z=='-' ){
      esign = -1;
      z++;
    }else if( *z=='+' ){
      z++;
    }
    while( isdigit(*z) ){
      eval = eval*10 + *z - '0';
      z++;
    }
    while( eval>=64 ){ scale *= 1.0e+64; eval -= 64; }
    while( eval>=16 ){ scale *= 1.0e+16; eval -= 16; }
    while( eval>=4 ){ scale *= 1.0e+4; eval -= 4; }
    while( eval>=1 ){ scale *= 1.0e+1; eval -= 1; }
    if( esign<0 ){
      v1 /= scale;
    }else{
      v1 *= scale;
    }
  }
  return sign<0 ? -v1 : v1;
}

/* This comparison routine is what we use for comparison operations
** between numeric values in an SQL expression.  "Numeric" is a little
** bit misleading here.  What we mean is that the strings have a
** type of "numeric" from the point of view of SQL.  The strings
** do not necessarily contain numbers.  They could contain text.
**
................................................................................
  isNumA = sqliteIsNumber(atext);
  isNumB = sqliteIsNumber(btext);
  if( isNumA ){
    if( !isNumB ){
      result = -1;
    }else{
      double rA, rB;
      rA = sqliteAtoF(atext);
      rB = sqliteAtoF(btext);
      if( rA<rB ){
        result = -1;
      }else if( rA>rB ){
        result = +1;
      }else{
        result = 0;
      }
................................................................................
      isNumB = sqliteIsNumber(&b[1]);
      if( isNumA ){
        double rA, rB;
        if( !isNumB ){
          res = -1;
          break;
        }
        rA = sqliteAtoF(&a[1]);
        rB = sqliteAtoF(&b[1]);
        if( rA<rB ){
          res = -1;
          break;
        }
        if( rA>rB ){
          res = +1;
          break;

**
** Various scripts scan this source file in order to generate HTML
** documentation, headers files, or other derived files.  The formatting
** of the code in this file is, therefore, important.  See other comments
** in this file for details.  If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
**
** $Id: vdbe.c,v 1.245 2003/12/10 01:31:21 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include "vdbeInt.h"

/*
................................................................................
** already.
*/
#define Stringify(P,I) if((aStack[I].flags & STK_Str)==0){hardStringify(P,I);}
static int hardStringify(Vdbe *p, int i){
  Stack *pStack = &p->aStack[i];
  int fg = pStack->flags;
  if( fg & STK_Real ){
    sprintf(pStack->z,"%.15g",pStack->r);
  }else if( fg & STK_Int ){
    sprintf(pStack->z,"%d",pStack->i);
  }else{
    pStack->z[0] = 0;
  }
  p->zStack[i] = pStack->z;
  pStack->n = strlen(pStack->z)+1;
  pStack->flags = STK_Str;
  return 0;
................................................................................
** Any prior string or integer representation is retained.
** NULLs are converted into 0.0.
*/
#define Realify(P,I) \
    if(((P)->aStack[(I)].flags&STK_Real)==0){ hardRealify(P,I); }
static void hardRealify(Vdbe *p, int i){
  if( p->aStack[i].flags & STK_Str ){
    p->aStack[i].r = atof(p->zStack[i]);
  }else if( p->aStack[i].flags & STK_Int ){
    p->aStack[i].r = p->aStack[i].i;
  }else{
    p->aStack[i].r = 0.0;
  }
  p->aStack[i].flags |= STK_Real;
}
................................................................................
      Stringify(p, i);
      aStack[i].flags &= ~(STK_Int|STK_Real);
      nByte += aStack[i].n+1;
    }else if( (flags & (STK_Real|STK_Int))!=0 || sqliteIsNumber(zStack[i]) ){
      if( (flags & (STK_Real|STK_Int))==STK_Int ){
        aStack[i].r = aStack[i].i;
      }else if( (flags & (STK_Real|STK_Int))==0 ){
        aStack[i].r = atof(zStack[i]);
      }
      Release(p, i);
      z = aStack[i].z;
      sqliteRealToSortable(aStack[i].r, z);
      len = strlen(z);
      zStack[i] = 0;
      aStack[i].flags = STK_Real;
................................................................................
  if( sqliteSafetyOn(db) ) goto abort_due_to_misuse;
  break;
}

/* An other opcode is illegal...
*/
default: {
  sprintf(zBuf,"%d",pOp->opcode);
  sqliteSetString(&p->zErrMsg, "unknown opcode ", zBuf, (char*)0);
  rc = SQLITE_INTERNAL;
  break;
}

/*****************************************************************************
** The cases of the switch statement above this line should all be indented
................................................................................
  sqliteSetString(&p->zErrMsg, sqlite_error_string(rc), (char*)0);
  goto vdbe_halt;

  /* Jump to here if a operator is encountered that requires more stack
  ** operands than are currently available on the stack.
  */
not_enough_stack:
  sprintf(zBuf,"%d",pc);
  sqliteSetString(&p->zErrMsg, "too few operands on stack at ", zBuf, (char*)0);
  rc = SQLITE_INTERNAL;
  goto vdbe_halt;

  /* Jump here if an illegal or illformed instruction is executed.
  */
VERIFY(
bad_instruction:
  sprintf(zBuf,"%d",pc);
  sqliteSetString(&p->zErrMsg, "illegal operation at ", zBuf, (char*)0);
  rc = SQLITE_INTERNAL;
  goto vdbe_halt;
)
}

**
** Various scripts scan this source file in order to generate HTML
** documentation, headers files, or other derived files.  The formatting
** of the code in this file is, therefore, important.  See other comments
** in this file for details.  If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
**
** $Id: vdbe.c,v 1.246 2003/12/23 02:17:35 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include "vdbeInt.h"

/*
................................................................................
** already.
*/
#define Stringify(P,I) if((aStack[I].flags & STK_Str)==0){hardStringify(P,I);}
static int hardStringify(Vdbe *p, int i){
  Stack *pStack = &p->aStack[i];
  int fg = pStack->flags;
  if( fg & STK_Real ){
    sqlite_snprintf(sizeof(pStack->z),pStack->z,"%.15g",pStack->r);
  }else if( fg & STK_Int ){
    sqlite_snprintf(sizeof(pStack->z),pStack->z,"%d",pStack->i);
  }else{
    pStack->z[0] = 0;
  }
  p->zStack[i] = pStack->z;
  pStack->n = strlen(pStack->z)+1;
  pStack->flags = STK_Str;
  return 0;
................................................................................
** Any prior string or integer representation is retained.
** NULLs are converted into 0.0.
*/
#define Realify(P,I) \
    if(((P)->aStack[(I)].flags&STK_Real)==0){ hardRealify(P,I); }
static void hardRealify(Vdbe *p, int i){
  if( p->aStack[i].flags & STK_Str ){
    p->aStack[i].r = sqliteAtoF(p->zStack[i]);
  }else if( p->aStack[i].flags & STK_Int ){
    p->aStack[i].r = p->aStack[i].i;
  }else{
    p->aStack[i].r = 0.0;
  }
  p->aStack[i].flags |= STK_Real;
}
................................................................................
      Stringify(p, i);
      aStack[i].flags &= ~(STK_Int|STK_Real);
      nByte += aStack[i].n+1;
    }else if( (flags & (STK_Real|STK_Int))!=0 || sqliteIsNumber(zStack[i]) ){
      if( (flags & (STK_Real|STK_Int))==STK_Int ){
        aStack[i].r = aStack[i].i;
      }else if( (flags & (STK_Real|STK_Int))==0 ){
        aStack[i].r = sqliteAtoF(zStack[i]);
      }
      Release(p, i);
      z = aStack[i].z;
      sqliteRealToSortable(aStack[i].r, z);
      len = strlen(z);
      zStack[i] = 0;
      aStack[i].flags = STK_Real;
................................................................................
  if( sqliteSafetyOn(db) ) goto abort_due_to_misuse;
  break;
}

/* An other opcode is illegal...
*/
default: {
  sqlite_snprintf(sizeof(zBuf),zBuf,"%d",pOp->opcode);
  sqliteSetString(&p->zErrMsg, "unknown opcode ", zBuf, (char*)0);
  rc = SQLITE_INTERNAL;
  break;
}

/*****************************************************************************
** The cases of the switch statement above this line should all be indented
................................................................................
  sqliteSetString(&p->zErrMsg, sqlite_error_string(rc), (char*)0);
  goto vdbe_halt;

  /* Jump to here if a operator is encountered that requires more stack
  ** operands than are currently available on the stack.
  */
not_enough_stack:
  sqlite_snprintf(sizeof(zBuf),zBuf,"%d",pc);
  sqliteSetString(&p->zErrMsg, "too few operands on stack at ", zBuf, (char*)0);
  rc = SQLITE_INTERNAL;
  goto vdbe_halt;

  /* Jump here if an illegal or illformed instruction is executed.
  */
VERIFY(
bad_instruction:
  sqlite_snprintf(sizeof(zBuf),zBuf,"%d",pc);
  sqliteSetString(&p->zErrMsg, "illegal operation at ", zBuf, (char*)0);
  rc = SQLITE_INTERNAL;
  goto vdbe_halt;
)
}

#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the the library is able to correctly
# handle file-format 3 (version 2.6.x) databases.
#
# $Id: format3.test,v 1.3 2003/06/03 01:47:12 drh Exp $

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

# Create a bunch of data to sort against
#
do_test format3-1.0 {
................................................................................
do_test format3-11.1 {
  execsql {SELECT '0'=='0.0'}
} {1}
do_test format3-11.2 {
  execsql {SELECT '0'==0.0}
} {1}
do_test format3-11.3 {
  execsql {SELECT '12345678901234567890'=='12345678901234567891'}
} {1}
do_test format3-11.4 {
  execsql {
    CREATE TABLE t6(a INT UNIQUE, b TEXT UNIQUE);
    INSERT INTO t6 VALUES('0','0.0');
    SELECT * FROM t6;
  }

#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the the library is able to correctly
# handle file-format 3 (version 2.6.x) databases.
#
# $Id: format3.test,v 1.4 2003/12/23 02:17:35 drh Exp $

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

# Create a bunch of data to sort against
#
do_test format3-1.0 {
................................................................................
do_test format3-11.1 {
  execsql {SELECT '0'=='0.0'}
} {1}
do_test format3-11.2 {
  execsql {SELECT '0'==0.0}
} {1}
do_test format3-11.3 {
  execsql {SELECT '123456789012345678901'=='123456789012345678900'}
} {1}
do_test format3-11.4 {
  execsql {
    CREATE TABLE t6(a INT UNIQUE, b TEXT UNIQUE);
    INSERT INTO t6 VALUES('0','0.0');
    SELECT * FROM t6;
  }

#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file implements tests for miscellanous features that were
# left out of other test files.
#
# $Id: misc3.test,v 1.1 2003/12/17 23:57:36 drh Exp $

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

# Ticket #529.  Make sure an ABORT does not damage the in-memory cache
# that will be used by subsequent statements in the same transaction.
#
................................................................................
  catchsql {UPDATE t1 SET a=CASE a WHEN 128 THEN 127 ELSE a END, b='';}
  execsql {
    INSERT INTO t1 VALUES(200,'hello out there');
    COMMIT;
    PRAGMA integrity_check;
  }
} ok
































finish_test

#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file implements tests for miscellanous features that were
# left out of other test files.
#
# $Id: misc3.test,v 1.2 2003/12/23 02:17:35 drh Exp $

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

# Ticket #529.  Make sure an ABORT does not damage the in-memory cache
# that will be used by subsequent statements in the same transaction.
#
................................................................................
  catchsql {UPDATE t1 SET a=CASE a WHEN 128 THEN 127 ELSE a END, b='';}
  execsql {
    INSERT INTO t1 VALUES(200,'hello out there');
    COMMIT;
    PRAGMA integrity_check;
  }
} ok

# Tests of the sqliteAtoF() function in util.c
#
do_test misc3-2.1 {
  execsql {SELECT 2e-25*0.5e25}
} 1
do_test misc3-2.2 {
  execsql {SELECT 2.0e-25*000000.500000000000000000000000000000e+00025}
} 1
do_test misc3-2.3 {
  execsql {SELECT 000000000002e-0000000025*0.5e25}
} 1
do_test misc3-2.4 {
  execsql {SELECT 2e-25*0.5e250}
} 1e+225
do_test misc3-2.5 {
  execsql {SELECT 2.0e-250*0.5e25}
} 1e-225
do_test misc3-2.6 {
  execsql {SELECT '-2.0e-127' * '-0.5e27'}
} 1e-100
do_test misc3-2.7 {
  execsql {SELECT '+2.0e-127' * '-0.5e27'}
} -1e-100
do_test misc3-2.8 {
  execsql {SELECT 2.0e-27 * '+0.5e+127'}
} 1e+100
do_test misc3-2.9 {
  execsql {SELECT 2.0e-27 * '+0.000005e+132'}
} 1e+100


finish_test