SQLite

**     input:     *val = 3.14159
**     output:    *val = 1.4159    function return = '3'
**
** The counter *cnt is incremented each time.  After counter exceeds
** 16 (the number of significant digits in a 64-bit float) '0' is
** always returned.
*/
static int et_getdigit(LONGDOUBLE_TYPE *val, int *cnt){
  int digit;
  LONGDOUBLE_TYPE d;
  if( (*cnt)++ >= 16 ) return '0';
  digit = (int)*val;
  d = digit;
  digit += '0';
  *val = (*val - d)*10.0;
  return digit;
}

  int flag_plussign;        /* True if "+" flag is present */
  int flag_blanksign;       /* True if " " flag is present */
  int flag_alternateform;   /* True if "#" flag is present */
  int flag_zeropad;         /* True if field width constant starts with zero */
  int flag_long;            /* True if "l" flag is present */
  int flag_center;          /* True if "=" flag is present */
  unsigned long longvalue;  /* Value for integer types */
  LONGDOUBLE_TYPE realvalue; /* Value for real types */
  et_info *infop;           /* Pointer to the appropriate info structure */
  char buf[etBUFSIZE];      /* Conversion buffer */
  char prefix;              /* Prefix character.  "+" or "-" or " " or '\0'. */
  int  errorflag = 0;       /* True if an error is encountered */
  enum et_type xtype;       /* Conversion paradigm */
  char *zExtra;             /* Extra memory used for etTCLESCAPE conversions */
  static char spaces[] = "                                                  "

/*
** 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 1.207 2004/01/07 03:04:27 drh Exp $
*/
#include "config.h"
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"

#endif
typedef UINT32_TYPE u32;           /* 4-byte unsigned integer */
typedef UINT16_TYPE u16;           /* 2-byte unsigned integer */
typedef UINT8_TYPE u8;             /* 1-byte unsigned integer */
typedef INTPTR_TYPE ptr;           /* Big enough to hold a pointer */
typedef unsigned INTPTR_TYPE uptr; /* Big enough to hold a pointer */

/*
** Most C compilers these days recognize "long double", don't they?
** Just in case we encounter one that does not, we will create a macro
** for long double so that it can be easily changed to just "double".
*/
#ifndef LONGDOUBLE_TYPE
# define LONGDOUBLE_TYPE long double
#endif

/*
** This macro casts a pointer to an integer.  Useful for doing
** pointer arithmetic.
*/
#define Addr(X)  ((uptr)X)

/*

**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.71 2004/01/07 03:04:27 drh Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>
#include <ctype.h>

/*
** If malloc() ever fails, this global variable gets set to 1.

** 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;
  LONGDOUBLE_TYPE v1 = 0.0;
  if( *z=='-' ){
    sign = -1;
    z++;
  }else if( *z=='+' ){
    z++;
  }
  while( isdigit(*z) ){
    v1 = v1*10.0 + (*z - '0');
    z++;
  }
  if( *z=='.' ){
    LONGDOUBLE_TYPE 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;
    LONGDOUBLE_TYPE scale = 1.0;
    z++;
    if( *z=='-' ){
      esign = -1;
      z++;
    }else if( *z=='+' ){
      z++;
    }