New upstream version 3.3.3+dfsg1.upstream/3.3.3+dfsg1

1 files changed, 0 insertions, 1975 deletions

diff --git a/Plugins/DbSqliteWx/extensionfunctions.c b/Plugins/DbSqliteWx/extensionfunctions.c
deleted file mode 100644
index bac8449..0000000
--- a/Plugins/DbSqliteWx/extensionfunctions.c
+++ /dev/null
@@ -1,1975 +0,0 @@
-/*
-This library will provide common mathematical and string functions in
-SQL queries using the operating system libraries or provided
-definitions.  It includes the following functions:
-
-Math: acos, asin, atan, atn2, atan2, acosh, asinh, atanh, difference,
-degrees, radians, cos, sin, tan, cot, cosh, sinh, tanh, coth, exp,
-log, log10, power, sign, sqrt, square, ceil, floor, pi.
-
-String: replicate, charindex, leftstr, rightstr, ltrim, rtrim, trim,
-replace, reverse, proper, padl, padr, padc, strfilter.
-
-Aggregate: stdev, variance, mode, median, lower_quartile,
-upper_quartile.
-
-The string functions ltrim, rtrim, trim, replace are included in
-recent versions of SQLite and so by default do not build.
-
-Compilation instructions:
- Compile this C source file into a dynamic library as follows:
- * Linux:
-   gcc -fPIC -lm -shared extension-functions.c -o libsqlitefunctions.so
- * Mac OS X:
-   gcc -fno-common -dynamiclib extension-functions.c -o libsqlitefunctions.dylib
- (You may need to add flags
-  -I /opt/local/include/ -L/opt/local/lib -lwx_sqlite3
-  if your wx_sqlite3 is installed from Mac ports, or
-  -I /sw/include/ -L/sw/lib -lwx_sqlite3
-  if installed with Fink.)
- * Windows:
-  1. Install MinGW (http://www.mingw.org/) and you will get the gcc
-  (gnu compiler collection)
-  2. add the path to your path variable (isn't done during the
-   installation!)
-  3. compile:
-   gcc -shared -I "path" -o libsqlitefunctions.so extension-functions.c
-   (path = path of wx_sqlite3ext.h; i.e. C:\programs\sqlite)
-
-Usage instructions for applications calling the wx_sqlite3 API functions:
-  In your application, call wx_sqlite3_enable_load_extension(db,1) to
-  allow loading external libraries.  Then load the library libsqlitefunctions
-  using wx_sqlite3_load_extension; the third argument should be 0.
-  See http://www.sqlite.org/cvstrac/wiki?p=LoadableExtensions.
-  Select statements may now use these functions, as in
-  SELECT cos(radians(inclination)) FROM satsum WHERE satnum = 25544;
-
-Usage instructions for the wx_sqlite3 program:
-  If the program is built so that loading extensions is permitted,
-  the following will work:
-   sqlite> SELECT load_extension('./libsqlitefunctions.so');
-   sqlite> select cos(radians(45));
-   0.707106781186548
-  Note: Loading extensions is by default prohibited as a
-  security measure; see "Security Considerations" in
-  http://www.sqlite.org/cvstrac/wiki?p=LoadableExtensions.
-  If the wx_sqlite3 program and library are built this
-  way, you cannot use these functions from the program, you 
-  must write your own program using the wx_sqlite3 API, and call
-  wx_sqlite3_enable_load_extension as described above, or else
-  rebuilt the wx_sqlite3 program to allow loadable extensions.
-
-Alterations:
-The instructions are for Linux, Mac OS X, and Windows; users of other
-OSes may need to modify this procedure.  In particular, if your math
-library lacks one or more of the needed trig or log functions, comment
-out the appropriate HAVE_ #define at the top of file.  If you do not
-wish to make a loadable module, comment out the define for
-COMPILE_SQLITE_EXTENSIONS_AS_LOADABLE_MODULE.  If you are using a
-version of SQLite without the trim functions and replace, comment out
-the HAVE_TRIM #define.
-
-Liam Healy
-
-History:
-2010-01-06 Correct check for argc in squareFunc, and add Windows
-compilation instructions.
-2009-06-24 Correct check for argc in properFunc.
-2008-09-14 Add check that memory was actually allocated after
-wx_sqlite3_malloc or wx_sqlite3StrDup, call wx_sqlite3_result_error_nomem if
-not.  Thanks to Robert Simpson.
-2008-06-13 Change to instructions to indicate use of the math library
-and that program might work.
-2007-10-01 Minor clarification to instructions.
-2007-09-29 Compilation as loadable module is optional with
-COMPILE_SQLITE_EXTENSIONS_AS_LOADABLE_MODULE.
-2007-09-28 Use wx_sqlite3_extension_init and macros
-SQLITE_EXTENSION_INIT1, SQLITE_EXTENSION_INIT2, so that it works with
-wx_sqlite3_load_extension.  Thanks to Eric Higashino and Joe Wilson.
-New instructions for Mac compilation.
-2007-09-17 With help from Joe Wilson and Nuno Luca, made use of
-external interfaces so that compilation is no longer dependent on
-SQLite source code.  Merged source, header, and README into a single
-file.  Added casts so that Mac will compile without warnings (unsigned
-and signed char).
-2007-09-05 Included some definitions from sqlite 3.3.13 so that this
-will continue to work in newer versions of sqlite.  Completed
-description of functions available.
-2007-03-27 Revised description.
-2007-03-23 Small cleanup and a bug fix on the code.  This was mainly
-letting errno flag errors encountered in the math library and checking
-the result, rather than pre-checking.  This fixes a bug in power that
-would cause an error if any non-positive number was raised to any
-power.
-2007-02-07 posted by Mikey C to sqlite mailing list.
-Original code 2006 June 05 by relicoder.
-
-*/
-
-/* #include "config.h" */
-
-/* #define COMPILE_SQLITE_EXTENSIONS_AS_LOADABLE_MODULE 1 */
-#if defined(_MSC_VER) && _MSC_VER <= 1700
-#else
-#define HAVE_ACOSH 1
-#define HAVE_ASINH 1
-#define HAVE_ATANH 1
-#endif
-#define HAVE_SINH 1
-#define HAVE_COSH 1
-#define HAVE_TANH 1
-#define HAVE_LOG10 1
-#if defined(_MSC_VER) && _MSC_VER <= 1700
-#else
-#define HAVE_ISBLANK 1
-#endif
-#define SQLITE_SOUNDEX 1
-#define HAVE_TRIM 1		/* LMH 2007-03-25 if sqlite has trim functions */
-
-#ifdef COMPILE_SQLITE_EXTENSIONS_AS_LOADABLE_MODULE
-#include "wx_sqlite3ext.h"
-SQLITE_EXTENSION_INIT1
-#else
-#include "wxsqlite3.h"
-#endif
-
-#include <ctype.h>
-/* relicoder */
-#include <math.h>
-#include <string.h>
-#include <stdio.h>
-#include <errno.h>		/* LMH 2007-03-25 */
-
-#include <stdlib.h>
-#include <assert.h>
-
-#ifndef _MAP_H_
-#define _MAP_H_
-
-#if 0
-#if !defined(SQLITE_OS_WIN) || !defined(_MSC_VER)
-#include <stdint.h>
-#else
-typedef signed char int8_t;
-typedef unsigned char uint8_t;
-typedef signed int int16_t;
-typedef unsigned int uint16_t;
-typedef signed long int int32_t;
-typedef unsigned long int uint32_t;
-typedef signed __int64 int64_t;
-typedef unsigned __int64 uint64_t;
-#endif
-#endif
-
-/*
-** Simple binary tree implementation to use in median, mode and quartile calculations
-** Tree is not necessarily balanced. That would require something like red&black trees of AVL
-*/
-
-typedef int(*cmp_func)(const void *, const void *);
-typedef void(*map_iterator)(void*, i64, void*);
-
-typedef struct node{
-  struct node *l;
-  struct node *r;
-  void* data;
-  i64   count;
-} node;
-
-typedef struct map{
-  node *base;
-  cmp_func cmp;
-  short free;
-} map;
-
-/*
-** creates a map given a comparison function
-*/
-map map_make(cmp_func cmp);
-
-/*
-** inserts the element e into map m
-*/
-void map_insert(map *m, void *e);
-
-/*
-** executes function iter over all elements in the map, in key increasing order
-*/
-void map_iterate(map *m, map_iterator iter, void* p);
-
-/*
-** frees all memory used by a map
-*/
-void map_destroy(map *m);
-
-/*
-** compares 2 integers
-** to use with map_make
-*/
-int int_cmp(const void *a, const void *b);
-
-/*
-** compares 2 doubles
-** to use with map_make
-*/
-int double_cmp(const void *a, const void *b);
-
-#endif /* _MAP_H_ */
-
-static char *wx_sqlite3StrDup( const char *z ) {
-    char *res = wx_sqlite3_malloc( strlen(z)+1 );
-    return strcpy( res, z );
-}
-
-/*
-** These are copied verbatim from fun.c so as to not have the names exported
-*/
-
-/* LMH from wx_sqlite3 3.3.13 */
-/*
-** This table maps from the first byte of a UTF-8 character to the number
-** of trailing bytes expected. A value '4' indicates that the table key
-** is not a legal first byte for a UTF-8 character.
-*/
-static const u8 xtra_utf8_bytes[256]  = {
-/* 0xxxxxxx */
-0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-0, 0, 0, 0, 0, 0, 0, 0,     0, 0, 0, 0, 0, 0, 0, 0,
-
-/* 10wwwwww */
-4, 4, 4, 4, 4, 4, 4, 4,     4, 4, 4, 4, 4, 4, 4, 4,
-4, 4, 4, 4, 4, 4, 4, 4,     4, 4, 4, 4, 4, 4, 4, 4,
-4, 4, 4, 4, 4, 4, 4, 4,     4, 4, 4, 4, 4, 4, 4, 4,
-4, 4, 4, 4, 4, 4, 4, 4,     4, 4, 4, 4, 4, 4, 4, 4,
-
-/* 110yyyyy */
-1, 1, 1, 1, 1, 1, 1, 1,     1, 1, 1, 1, 1, 1, 1, 1,
-1, 1, 1, 1, 1, 1, 1, 1,     1, 1, 1, 1, 1, 1, 1, 1,
-
-/* 1110zzzz */
-2, 2, 2, 2, 2, 2, 2, 2,     2, 2, 2, 2, 2, 2, 2, 2,
-
-/* 11110yyy */
-3, 3, 3, 3, 3, 3, 3, 3,     4, 4, 4, 4, 4, 4, 4, 4,
-};
-
-
-/*
-** This table maps from the number of trailing bytes in a UTF-8 character
-** to an integer constant that is effectively calculated for each character
-** read by a naive implementation of a UTF-8 character reader. The code
-** in the READ_UTF8 macro explains things best.
-*/
-static const int xtra_utf8_bits[] =  {
-  0,
-  12416,          /* (0xC0 << 6) + (0x80) */
-  925824,         /* (0xE0 << 12) + (0x80 << 6) + (0x80) */
-  63447168        /* (0xF0 << 18) + (0x80 << 12) + (0x80 << 6) + 0x80 */
-};
-
-/*
-** If a UTF-8 character contains N bytes extra bytes (N bytes follow
-** the initial byte so that the total character length is N+1) then
-** masking the character with utf8_mask[N] must produce a non-zero
-** result.  Otherwise, we have an (illegal) overlong encoding.
-*/
-static const int utf_mask[] = {
-  0x00000000,
-  0xffffff80,
-  0xfffff800,
-  0xffff0000,
-};
-
-/* LMH salvaged from wx_sqlite3 3.3.13 source code src/utf.c */
-#define EXTFUNC_READ_UTF8(zIn, c) { \
-  int xtra;                                            \
-  c = *(zIn)++;                                        \
-  xtra = xtra_utf8_bytes[c];                           \
-  switch( xtra ){                                      \
-    case 4: c = (int)0xFFFD; break;                    \
-    case 3: c = (c<<6) + *(zIn)++;                     \
-    case 2: c = (c<<6) + *(zIn)++;                     \
-    case 1: c = (c<<6) + *(zIn)++;                     \
-    c -= xtra_utf8_bits[xtra];                         \
-    if( (utf_mask[xtra]&c)==0                          \
-        || (c&0xFFFFF800)==0xD800                      \
-        || (c&0xFFFFFFFE)==0xFFFE ){  c = 0xFFFD; }    \
-  }                                                    \
-}
-
-static int wx_sqlite3ReadUtf8(const unsigned char *z){
-  int c;
-  EXTFUNC_READ_UTF8(z, c);
-  return c;
-}
-
-#define SKIP_UTF8(zIn) {                               \
-  zIn += (xtra_utf8_bytes[*(u8 *)zIn] + 1);            \
-}
-
-#if 0
-/*
-** pZ is a UTF-8 encoded unicode string. If nByte is less than zero,
-** return the number of unicode characters in pZ up to (but not including)
-** the first 0x00 byte. If nByte is not less than zero, return the
-** number of unicode characters in the first nByte of pZ (or up to 
-** the first 0x00, whichever comes first).
-*/
-static int wx_sqlite3Utf8CharLen(const char *z, int nByte){
-  int r = 0;
-  const char *zTerm;
-  if( nByte>=0 ){
-    zTerm = &z[nByte];
-  }else{
-    zTerm = (const char *)(-1);
-  }
-  assert( z<=zTerm );
-  while( *z!=0 && z<zTerm ){
-    SKIP_UTF8(z);
-    r++;
-  }
-  return r;
-}
-#endif
-
-/*
-** X is a pointer to the first byte of a UTF-8 character.  Increment
-** X so that it points to the next character.  This only works right
-** if X points to a well-formed UTF-8 string.
-*/
-#define sqliteNextChar(X)  while( (0xc0&*++(X))==0x80 ){}
-#define sqliteCharVal(X)   wx_sqlite3ReadUtf8(X)
-
-/*
-** This is a macro that facilitates writting wrappers for math.h functions
-** it creates code for a function to use in SQlite that gets one numeric input
-** and returns a floating point value.
-**
-** Could have been implemented using pointers to functions but this way it's inline
-** and thus more efficient. Lower * ranking though...
-** 
-** Parameters:
-** name:      function name to de defined (eg: sinFunc)
-** function:  function defined in math.h to wrap (eg: sin)
-** domain:    boolean condition that CAN'T happen in terms of the input parameter rVal
-**            (eg: rval<0 for sqrt)
-*/
-/* LMH 2007-03-25 Changed to use errno and remove domain; no pre-checking for errors. */
-#define GEN_MATH_WRAP_DOUBLE_1(name, function) \
-static void name(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){\
-  double rVal = 0.0, val;\
-  assert( argc==1 );\
-  switch( wx_sqlite3_value_type(argv[0]) ){\
-    case SQLITE_NULL: {\
-      wx_sqlite3_result_null(context);\
-      break;\
-    }\
-    default: {\
-      rVal = wx_sqlite3_value_double(argv[0]);\
-      errno = 0;\
-      val = function(rVal);\
-      if (errno == 0) {\
-        wx_sqlite3_result_double(context, val);\
-      } else {\
-        wx_sqlite3_result_error(context, strerror(errno), errno);\
-      }\
-      break;\
-    }\
-  }\
-}\
-
-
-/*
-** Example of GEN_MATH_WRAP_DOUBLE_1 usage
-** this creates function sqrtFunc to wrap the math.h standard function sqrt(x)=x^0.5
-*/
-GEN_MATH_WRAP_DOUBLE_1(sqrtFunc, sqrt)
-
-/* trignometric functions */
-GEN_MATH_WRAP_DOUBLE_1(acosFunc, acos)
-GEN_MATH_WRAP_DOUBLE_1(asinFunc, asin)
-GEN_MATH_WRAP_DOUBLE_1(atanFunc, atan)
-
-/*
-** Many of systems don't have inverse hyperbolic trig functions so this will emulate
-** them on those systems in terms of log and sqrt (formulas are too trivial to demand 
-** written proof here)
-*/
-
-#ifndef HAVE_ACOSH
-static double acosh(double x){
-  return log(x + sqrt(x*x - 1.0));
-}
-#endif
-
-GEN_MATH_WRAP_DOUBLE_1(acoshFunc, acosh)
-
-#ifndef HAVE_ASINH
-static double asinh(double x){
-  return log(x + sqrt(x*x + 1.0));
-}
-#endif
-
-GEN_MATH_WRAP_DOUBLE_1(asinhFunc, asinh)
-
-#ifndef HAVE_ATANH
-static double atanh(double x){
-  return (1.0/2.0)*log((1+x)/(1-x)) ;
-}
-#endif
-
-GEN_MATH_WRAP_DOUBLE_1(atanhFunc, atanh)
-
-/*
-** math.h doesn't require cot (cotangent) so it's defined here
-*/
-static double cot(double x){
-  return 1.0/tan(x);
-}
-
-GEN_MATH_WRAP_DOUBLE_1(sinFunc, sin)
-GEN_MATH_WRAP_DOUBLE_1(cosFunc, cos)
-GEN_MATH_WRAP_DOUBLE_1(tanFunc, tan)
-GEN_MATH_WRAP_DOUBLE_1(cotFunc, cot)
-
-static double coth(double x){
-  return 1.0/tanh(x);
-}
-
-/*
-** Many systems don't have hyperbolic trigonometric functions so this will emulate
-** them on those systems directly from the definition in terms of exp
-*/
-#ifndef HAVE_SINH
-static double sinh(double x){
-  return (exp(x)-exp(-x))/2.0;
-}
-#endif
-
-GEN_MATH_WRAP_DOUBLE_1(sinhFunc, sinh)
-
-#ifndef HAVE_COSH
-static double cosh(double x){
-  return (exp(x)+exp(-x))/2.0;
-}
-#endif
-
-GEN_MATH_WRAP_DOUBLE_1(coshFunc, cosh)
-
-#ifndef HAVE_TANH
-static double tanh(double x){
-  return sinh(x)/cosh(x);
-}
-#endif
-
-GEN_MATH_WRAP_DOUBLE_1(tanhFunc, tanh)
-
-GEN_MATH_WRAP_DOUBLE_1(cothFunc, coth)
-
-/*
-** Some systems lack log in base 10. This will emulate it
-*/
-
-#ifndef HAVE_LOG10
-static double log10(double x){
-  static double l10 = -1.0;
-  if( l10<0.0 ){
-    l10 = log(10.0);
-  }
-  return log(x)/l10;
-}
-#endif
-
-GEN_MATH_WRAP_DOUBLE_1(logFunc, log)
-GEN_MATH_WRAP_DOUBLE_1(log10Func, log10)
-GEN_MATH_WRAP_DOUBLE_1(expFunc, exp)
-
-/*
-** Fallback for systems where math.h doesn't define M_PI
-*/
-#undef M_PI
-#ifndef M_PI
-/*
-** static double PI = acos(-1.0);
-** #define M_PI (PI)
-*/
-#define M_PI 3.14159265358979323846
-#endif
-
-/* Convert Degrees into Radians */
-static double deg2rad(double x){
-  return x*M_PI/180.0;
-}
-
-/* Convert Radians into Degrees */
-static double rad2deg(double x){
-  return 180.0*x/M_PI;
-}
-
-GEN_MATH_WRAP_DOUBLE_1(rad2degFunc, rad2deg)
-GEN_MATH_WRAP_DOUBLE_1(deg2radFunc, deg2rad)
-
-/* constant function that returns the value of PI=3.1415... */
-static void piFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  wx_sqlite3_result_double(context, M_PI);
-}
-
-/*
-** Implements the sqrt function, it has the peculiarity of returning an integer when the
-** the argument is an integer.
-** Since SQLite isn't strongly typed (almost untyped actually) this is a bit pedantic
-*/
-static void squareFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  i64 iVal = 0;
-  double rVal = 0.0;
-  assert( argc==1 );
-  switch( wx_sqlite3_value_type(argv[0]) ){
-    case SQLITE_INTEGER: {
-      iVal = wx_sqlite3_value_int64(argv[0]);
-      wx_sqlite3_result_int64(context, iVal*iVal);
-      break;
-    }
-    case SQLITE_NULL: {
-      wx_sqlite3_result_null(context);
-      break;
-    }
-    default: {
-      rVal = wx_sqlite3_value_double(argv[0]);
-      wx_sqlite3_result_double(context, rVal*rVal);
-      break;
-    }
-  }
-}
-
-/*
-** Wraps the pow math.h function
-** When both the base and the exponent are integers the result should be integer
-** (see sqrt just before this). Here the result is always double
-*/
-/* LMH 2007-03-25 Changed to use errno; no pre-checking for errors.  Also removes
-  but that was present in the pre-checking that called wx_sqlite3_result_error on 
-  a non-positive first argument, which is not always an error. */
-static void powerFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  double r1 = 0.0;
-  double r2 = 0.0;
-  double val;
-
-  assert( argc==2 );
-  
-  if( wx_sqlite3_value_type(argv[0]) == SQLITE_NULL || wx_sqlite3_value_type(argv[1]) == SQLITE_NULL ){
-    wx_sqlite3_result_null(context); 
-  }else{
-    r1 = wx_sqlite3_value_double(argv[0]);
-    r2 = wx_sqlite3_value_double(argv[1]);
-    errno = 0;
-    val = pow(r1,r2);
-    if (errno == 0) {
-      wx_sqlite3_result_double(context, val);
-    } else {  
-      wx_sqlite3_result_error(context, strerror(errno), errno);
-    }  
-  }
-}
-
-/*
-** atan2 wrapper
-*/
-static void atn2Func(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  double r1 = 0.0;
-  double r2 = 0.0;
-
-  assert( argc==2 );
-  
-  if( wx_sqlite3_value_type(argv[0]) == SQLITE_NULL || wx_sqlite3_value_type(argv[1]) == SQLITE_NULL ){
-    wx_sqlite3_result_null(context); 
-  }else{
-    r1 = wx_sqlite3_value_double(argv[0]);
-    r2 = wx_sqlite3_value_double(argv[1]);
-    wx_sqlite3_result_double(context, atan2(r1,r2));
-  }
-}
-
-/*
-** Implementation of the sign() function
-** return one of 3 possibilities +1,0 or -1 when the argument is respectively
-** positive, 0 or negative.
-** When the argument is NULL the result is also NULL (completly conventional)
-*/
-static void signFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  double rVal=0.0;
-  i64 iVal=0;
-  assert( argc==1 );
-  switch( wx_sqlite3_value_type(argv[0]) ){
-    case SQLITE_INTEGER: {
-      iVal = wx_sqlite3_value_int64(argv[0]);
-      iVal = ( iVal > 0) ? 1: ( iVal < 0 ) ? -1: 0;
-      wx_sqlite3_result_int64(context, iVal);
-      break;
-    }
-    case SQLITE_NULL: {
-      wx_sqlite3_result_null(context);
-      break;
-    }
-    default: {
- /* 2nd change below. Line for abs was: if( rVal<0 ) rVal = rVal * -1.0;  */
-
-      rVal = wx_sqlite3_value_double(argv[0]);
-      rVal = ( rVal > 0) ? 1: ( rVal < 0 ) ? -1: 0;
-      wx_sqlite3_result_double(context, rVal);
-      break;
-    }
-  }
-}
-
-
-/*
-** smallest integer value not less than argument
-*/
-static void ceilFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  double rVal=0.0;
-  i64 iVal=0;
-  assert( argc==1 );
-  switch( wx_sqlite3_value_type(argv[0]) ){
-    case SQLITE_INTEGER: {
-      i64 iVal = wx_sqlite3_value_int64(argv[0]);
-      wx_sqlite3_result_int64(context, iVal);
-      break;
-    }
-    case SQLITE_NULL: {
-      wx_sqlite3_result_null(context);
-      break;
-    }
-    default: {
-      rVal = wx_sqlite3_value_double(argv[0]);
-      wx_sqlite3_result_int64(context, (i64) ceil(rVal));
-      break;
-    }
-  }
-}
-
-/*
-** largest integer value not greater than argument
-*/
-static void floorFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  double rVal=0.0;
-  i64 iVal=0;
-  assert( argc==1 );
-  switch( wx_sqlite3_value_type(argv[0]) ){
-    case SQLITE_INTEGER: {
-      i64 iVal = wx_sqlite3_value_int64(argv[0]);
-      wx_sqlite3_result_int64(context, iVal);
-      break;
-    }
-    case SQLITE_NULL: {
-      wx_sqlite3_result_null(context);
-      break;
-    }
-    default: {
-      rVal = wx_sqlite3_value_double(argv[0]);
-      wx_sqlite3_result_int64(context, (i64) floor(rVal));
-      break;
-    }
-  }
-}
-
-/*
-** Given a string (s) in the first argument and an integer (n) in the second returns the 
-** string that constains s contatenated n times
-*/
-static void replicateFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  unsigned char *z;        /* input string */
-  unsigned char *zo;       /* result string */
-  i64 iCount;              /* times to repeat */
-  i64 nLen;                /* length of the input string (no multibyte considerations) */ 
-  i64 nTLen;               /* length of the result string (no multibyte considerations) */
-  i64 i=0;
-
-  if( argc!=2 || SQLITE_NULL==wx_sqlite3_value_type(argv[0]) )
-    return;
-
-  iCount = wx_sqlite3_value_int64(argv[1]);
-
-  if( iCount<0 ){
-    wx_sqlite3_result_error(context, "domain error", -1);
-  }else{
-
-    nLen  = wx_sqlite3_value_bytes(argv[0]);
-    nTLen = nLen*iCount;
-    z=wx_sqlite3_malloc(nTLen+1);
-    zo=wx_sqlite3_malloc(nLen+1);
-    if (!z || !zo){
-      wx_sqlite3_result_error_nomem(context);
-      if (z) wx_sqlite3_free(z);
-      if (zo) wx_sqlite3_free(zo);
-      return;
-    }
-    strcpy((char*)zo, (char*)wx_sqlite3_value_text(argv[0]));
-
-    for(i=0; i<iCount; ++i){
-      strcpy((char*)(z+i*nLen), (char*)zo);
-    }
-
-    wx_sqlite3_result_text(context, (char*)z, -1, SQLITE_TRANSIENT);
-    wx_sqlite3_free(z);
-    wx_sqlite3_free(zo);
-  }
-}
-
-/* 
-** Some systems (win32 among others) don't have an isblank function, this will emulate it.
-** This function is not UFT-8 safe since it only analyses a byte character.
-*/
-#ifndef HAVE_ISBLANK
-int isblank(char c){
-  return( ' '==c || '\t'==c );
-}
-#endif
-
-static void properFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  const unsigned char *z;     /* input string */
-  unsigned char *zo;          /* output string */
-  unsigned char *zt;          /* iterator */
-  char r;
-  int c=1;
-
-  assert( argc==1);
-  if( SQLITE_NULL==wx_sqlite3_value_type(argv[0]) ){
-    wx_sqlite3_result_null(context);
-    return;
-  }
-
-  z = wx_sqlite3_value_text(argv[0]);
-  zo = (unsigned char *)wx_sqlite3StrDup((char *) z);
-  if (!zo) {
-    wx_sqlite3_result_error_nomem(context);
-    return;
-  }
-  zt = zo;
-
-  while( (r = *(z++))!=0 ){
-    if( isblank(r) ){
-      c=1;
-    }else{
-      if( c==1 ){
-        r = toupper(r);
-      }else{
-        r = tolower(r);
-      }
-      c=0;
-    }
-    *(zt++) = r;
-  }
-  *zt = '\0';
-
-  wx_sqlite3_result_text(context, (char*)zo, -1, SQLITE_TRANSIENT);
-  wx_sqlite3_free(zo);
-}
-
-/*
-** given an input string (s) and an integer (n) adds spaces at the begining of  s
-** until it has a length of n characters.
-** When s has a length >=n it's a NOP
-** padl(NULL) = NULL
-*/
-static void padlFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  i64 ilen;          /* length to pad to */
-  i64 zl;            /* length of the input string (UTF-8 chars) */
-  int i = 0;
-  const char *zi;    /* input string */
-  char *zo;          /* output string */
-  char *zt;
-
-  assert( argc==2 );
-  
-  if( wx_sqlite3_value_type(argv[0]) == SQLITE_NULL ){
-    wx_sqlite3_result_null(context); 
-  }else{
-    zi = (char *)wx_sqlite3_value_text(argv[0]);
-    ilen = wx_sqlite3_value_int64(argv[1]);
-    /* check domain */
-    if(ilen<0){
-      wx_sqlite3_result_error(context, "domain error", -1);
-      return;
-    }
-    zl = wx_sqlite3Utf8CharLen(zi, -1);
-    if( zl>=ilen ){
-      /* string is longer than the requested pad length, return the same string (dup it) */
-      zo = wx_sqlite3StrDup(zi);
-      if (!zo){
-        wx_sqlite3_result_error_nomem(context);
-        return;
-      }
-      wx_sqlite3_result_text(context, zo, -1, SQLITE_TRANSIENT);
-    }else{
-      zo = wx_sqlite3_malloc(strlen(zi)+ilen-zl+1);
-      if (!zo){
-        wx_sqlite3_result_error_nomem(context);
-        return;
-      }
-      zt = zo;
-      for(i=1; i+zl<=ilen; ++i){
-        *(zt++)=' ';
-      }
-      /* no need to take UTF-8 into consideration here */
-      strcpy(zt,zi);
-    }
-    wx_sqlite3_result_text(context, zo, -1, SQLITE_TRANSIENT);
-    wx_sqlite3_free(zo);
-  }
-}
-
-/*
-** given an input string (s) and an integer (n) appends spaces at the end of  s
-** until it has a length of n characters.
-** When s has a length >=n it's a NOP
-** padl(NULL) = NULL
-*/
-static void padrFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  i64 ilen;          /* length to pad to */
-  i64 zl;            /* length of the input string (UTF-8 chars) */
-  i64 zll;           /* length of the input string (bytes) */
-  int i = 0;
-  const char *zi;    /* input string */
-  char *zo;          /* output string */
-  char *zt;
-
-  assert( argc==2 );
-  
-  if( wx_sqlite3_value_type(argv[0]) == SQLITE_NULL ){
-    wx_sqlite3_result_null(context); 
-  }else{
-    zi = (char *)wx_sqlite3_value_text(argv[0]);
-    ilen = wx_sqlite3_value_int64(argv[1]);
-    /* check domain */
-    if(ilen<0){
-      wx_sqlite3_result_error(context, "domain error", -1);
-      return;
-    }
-    zl = wx_sqlite3Utf8CharLen(zi, -1);
-    if( zl>=ilen ){
-      /* string is longer than the requested pad length, return the same string (dup it) */
-      zo = wx_sqlite3StrDup(zi);
-      if (!zo){
-        wx_sqlite3_result_error_nomem(context);
-        return;
-      }
-      wx_sqlite3_result_text(context, zo, -1, SQLITE_TRANSIENT);
-    }else{
-      zll = strlen(zi);
-      zo = wx_sqlite3_malloc(zll+ilen-zl+1);
-      if (!zo){
-        wx_sqlite3_result_error_nomem(context);
-        return;
-      }
-      zt = strcpy(zo,zi)+zll;
-      for(i=1; i+zl<=ilen; ++i){
-        *(zt++) = ' ';
-      }
-      *zt = '\0';
-    }
-    wx_sqlite3_result_text(context, zo, -1, SQLITE_TRANSIENT);
-    wx_sqlite3_free(zo);
-  }
-}
-
-/*
-** given an input string (s) and an integer (n) appends spaces at the end of  s
-** and adds spaces at the begining of s until it has a length of n characters.
-** Tries to add has many characters at the left as at the right.
-** When s has a length >=n it's a NOP
-** padl(NULL) = NULL
-*/
-static void padcFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  i64 ilen;           /* length to pad to */
-  i64 zl;             /* length of the input string (UTF-8 chars) */
-  i64 zll;            /* length of the input string (bytes) */
-  int i = 0;
-  const char *zi;     /* input string */
-  char *zo;           /* output string */
-  char *zt;
-
-  assert( argc==2 );
-  
-  if( wx_sqlite3_value_type(argv[0]) == SQLITE_NULL ){
-    wx_sqlite3_result_null(context); 
-  }else{
-    zi = (char *)wx_sqlite3_value_text(argv[0]);
-    ilen = wx_sqlite3_value_int64(argv[1]);
-    /* check domain */
-    if(ilen<0){
-      wx_sqlite3_result_error(context, "domain error", -1);
-      return;
-    }
-    zl = wx_sqlite3Utf8CharLen(zi, -1);
-    if( zl>=ilen ){
-      /* string is longer than the requested pad length, return the same string (dup it) */
-      zo = wx_sqlite3StrDup(zi);
-      if (!zo){
-        wx_sqlite3_result_error_nomem(context);
-        return;
-      }
-      wx_sqlite3_result_text(context, zo, -1, SQLITE_TRANSIENT);
-    }else{
-      zll = strlen(zi);
-      zo = wx_sqlite3_malloc(zll+ilen-zl+1);
-      if (!zo){
-        wx_sqlite3_result_error_nomem(context);
-        return;
-      }
-      zt = zo;
-      for(i=1; 2*i+zl<=ilen; ++i){
-        *(zt++) = ' ';
-      }
-      strcpy(zt, zi);
-      zt+=zll;
-      for(; i+zl<=ilen; ++i){
-        *(zt++) = ' ';
-      }
-      *zt = '\0';
-    }
-    wx_sqlite3_result_text(context, zo, -1, SQLITE_TRANSIENT);
-    wx_sqlite3_free(zo);
-  }
-}
-
-/*
-** given 2 string (s1,s2) returns the string s1 with the characters NOT in s2 removed
-** assumes strings are UTF-8 encoded
-*/
-static void strfilterFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  const char *zi1;        /* first parameter string (searched string) */
-  const char *zi2;        /* second parameter string (vcontains valid characters) */
-  const char *z1;
-  const char *z21;
-  const char *z22;
-  char *zo;               /* output string */
-  char *zot;
-  int c1 = 0;
-  int c2 = 0;
-
-  assert( argc==2 );
-  
-  if( wx_sqlite3_value_type(argv[0]) == SQLITE_NULL || wx_sqlite3_value_type(argv[1]) == SQLITE_NULL ){
-    wx_sqlite3_result_null(context); 
-  }else{
-    zi1 = (char *)wx_sqlite3_value_text(argv[0]);
-    zi2 = (char *)wx_sqlite3_value_text(argv[1]);
-    /* 
-    ** maybe I could allocate less, but that would imply 2 passes, rather waste 
-    ** (possibly) some memory
-    */
-    zo = wx_sqlite3_malloc(strlen(zi1)+1); 
-    if (!zo){
-      wx_sqlite3_result_error_nomem(context);
-      return;
-    }
-    zot = zo;
-    z1 = zi1;
-    while( (c1=sqliteCharVal((unsigned char *)z1))!=0 ){
-      z21=zi2;
-      while( (c2=sqliteCharVal((unsigned char *)z21))!=0 && c2!=c1 ){
-        sqliteNextChar(z21);
-      }
-      if( c2!=0){
-        z22=z21;
-        sqliteNextChar(z22);
-        strncpy(zot, z21, z22-z21);
-        zot+=z22-z21;
-      }
-      sqliteNextChar(z1);
-    }
-    *zot = '\0';
-
-    wx_sqlite3_result_text(context, zo, -1, SQLITE_TRANSIENT);
-    wx_sqlite3_free(zo);
-  }
-}
-
-/*
-** Given a string z1, retutns the (0 based) index of it's first occurence
-** in z2 after the first s characters.
-** Returns -1 when there isn't a match.
-** updates p to point to the character where the match occured.
-** This is an auxiliary function.
-*/
-static int _substr(const char* z1, const char* z2, int s, const char** p){
-  int c = 0;
-  int rVal=-1;
-  const char* zt1;
-  const char* zt2;
-  int c1,c2;
-
-  if( '\0'==*z1 ){
-    return -1;
-  }
-  
-  while( (sqliteCharVal((unsigned char *)z2) != 0) && (c++)<s){
-    sqliteNextChar(z2);
-  }
-  
-  c = 0;
-  while( (sqliteCharVal((unsigned char *)z2)) != 0 ){
-    zt1 = z1;
-    zt2 = z2;
-
-    do{
-      c1 = sqliteCharVal((unsigned char *)zt1);
-      c2 = sqliteCharVal((unsigned char *)zt2);
-      sqliteNextChar(zt1);
-      sqliteNextChar(zt2);
-    }while( c1 == c2 && c1 != 0 && c2 != 0 );
-
-    if( c1 == 0 ){
-      rVal = c;
-      break; 
-    }
-    
-    sqliteNextChar(z2);
-    ++c;
-  }
-  if(p){
-    *p=z2;
-  }
-  return rVal >=0 ? rVal+s : rVal;
-}
-
-/*
-** given 2 input strings (s1,s2) and an integer (n) searches from the nth character
-** for the string s1. Returns the position where the match occured.
-** Characters are counted from 1.
-** 0 is returned when no match occurs.
-*/
-
-static void charindexFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  const u8 *z1;          /* s1 string */
-  u8 *z2;                /* s2 string */
-  int s=0;
-  int rVal=0;
-
-  assert( argc==3 ||argc==2);
-
-  if( SQLITE_NULL==wx_sqlite3_value_type(argv[0]) || SQLITE_NULL==wx_sqlite3_value_type(argv[1])){
-    wx_sqlite3_result_null(context);
-    return;
-  }
-
-  z1 = wx_sqlite3_value_text(argv[0]);
-  if( z1==0 ) return;
-  z2 = (u8*) wx_sqlite3_value_text(argv[1]);
-  if(argc==3){
-    s = wx_sqlite3_value_int(argv[2])-1;
-    if(s<0){
-      s=0;
-    }
-  }else{
-    s = 0;
-  }
-
-  rVal = _substr((char *)z1,(char *)z2,s,NULL);
-  wx_sqlite3_result_int(context, rVal+1);
-}
-
-/*
-** given a string (s) and an integer (n) returns the n leftmost (UTF-8) characters
-** if the string has a length<=n or is NULL this function is NOP
-*/
-static void leftFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  int c=0;
-  int cc=0;
-  int l=0;
-  const unsigned char *z;       /* input string */
-  const unsigned char *zt;
-  unsigned char *rz;            /* output string */
-
-  assert( argc==2);
-
-  if( SQLITE_NULL==wx_sqlite3_value_type(argv[0]) || SQLITE_NULL==wx_sqlite3_value_type(argv[1])){
-    wx_sqlite3_result_null(context);
-    return;
-  }
-
-  z  = wx_sqlite3_value_text(argv[0]);
-  l  = wx_sqlite3_value_int(argv[1]);
-  zt = z;
-
-  while( sqliteCharVal(zt) && c++<l)
-    sqliteNextChar(zt);
-
-  cc=zt-z;
-
-  rz = wx_sqlite3_malloc(zt-z+1);
-  if (!rz){
-    wx_sqlite3_result_error_nomem(context);
-    return;
-  }
-  strncpy((char*) rz, (char*) z, zt-z);
-  *(rz+cc) = '\0';
-  wx_sqlite3_result_text(context, (char*)rz, -1, SQLITE_TRANSIENT); 
-  wx_sqlite3_free(rz);
-}
-
-/*
-** given a string (s) and an integer (n) returns the n rightmost (UTF-8) characters
-** if the string has a length<=n or is NULL this function is NOP
-*/
-static void rightFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  int l=0;
-  int c=0;
-  int cc=0;
-  const char *z;
-  const char *zt;
-  const char *ze;
-  char *rz;
-
-  assert( argc==2);
-
-  if( SQLITE_NULL == wx_sqlite3_value_type(argv[0]) || SQLITE_NULL == wx_sqlite3_value_type(argv[1])){
-    wx_sqlite3_result_null(context);
-    return;
-  }
-
-  z  = (char *)wx_sqlite3_value_text(argv[0]);
-  l  = wx_sqlite3_value_int(argv[1]);
-  zt = z;
-
-  while( sqliteCharVal((unsigned char *)zt)!=0){
-    sqliteNextChar(zt);
-    ++c;
-  }
-
-  ze = zt;
-  zt = z;
-
-  cc=c-l;
-  if(cc<0)
-    cc=0;
-  
-  while( cc-- > 0 ){
-    sqliteNextChar(zt);
-  }
-
-  rz = wx_sqlite3_malloc(ze-zt+1);
-  if (!rz){
-    wx_sqlite3_result_error_nomem(context);
-    return;
-  }
-  strcpy((char*) rz, (char*) (zt));
-  wx_sqlite3_result_text(context, (char*)rz, -1, SQLITE_TRANSIENT); 
-  wx_sqlite3_free(rz);
-}
-
-#ifndef HAVE_TRIM
-/*
-** removes the whitespaces at the begining of a string.
-*/
-const char* ltrim(const char* s){
-  while( *s==' ' )
-    ++s;
-  return s;
-}
-
-/*
-** removes the whitespaces at the end of a string.
-** !mutates the input string!
-*/
-void rtrim(char* s){
-  char* ss = s+strlen(s)-1;
-  while( ss>=s && *ss==' ' )
-    --ss;
-  *(ss+1)='\0';
-}
-
-/*
-**  Removes the whitespace at the begining of a string
-*/
-static void ltrimFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  const char *z;
-
-  assert( argc==1);
-
-  if( SQLITE_NULL==wx_sqlite3_value_type(argv[0]) ){
-    wx_sqlite3_result_null(context);
-    return;
-  }
-  z = wx_sqlite3_value_text(argv[0]);
-  wx_sqlite3_result_text(context, ltrim(z), -1, SQLITE_TRANSIENT); 
-}
-
-/*
-**  Removes the whitespace at the end of a string
-*/
-static void rtrimFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  const char *z;
-  char *rz;
-  /* try not to change data in argv */
-
-  assert( argc==1);
-
-  if( SQLITE_NULL==wx_sqlite3_value_type(argv[0]) ){
-    wx_sqlite3_result_null(context);
-    return;
-  }
-  z = wx_sqlite3_value_text(argv[0]);
-  rz = wx_sqlite3StrDup(z);
-  rtrim(rz);
-  wx_sqlite3_result_text(context, rz, -1, SQLITE_TRANSIENT);
-  wx_sqlite3_free(rz);
-}
-
-/*
-**  Removes the whitespace at the begining and end of a string
-*/
-static void trimFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  const char *z;
-  char *rz;
-  /* try not to change data in argv */
-
-  assert( argc==1);
-
-  if( SQLITE_NULL==wx_sqlite3_value_type(argv[0]) ){
-    wx_sqlite3_result_null(context);
-    return;
-  }
-  z = wx_sqlite3_value_text(argv[0]);
-  rz = wx_sqlite3StrDup(z);
-  rtrim(rz);
-  wx_sqlite3_result_text(context, ltrim(rz), -1, SQLITE_TRANSIENT);
-  wx_sqlite3_free(rz);
-}
-#endif
-
-/*
-** given a pointer to a string s1, the length of that string (l1), a new string (s2)
-** and it's length (l2) appends s2 to s1.
-** All lengths in bytes.
-** This is just an auxiliary function
-*/
-#if 0
-static void _append(char **s1, int l1, const char *s2, int l2){
-  *s1 = realloc(*s1, (l1+l2+1)*sizeof(char));
-  strncpy((*s1)+l1, s2, l2);
-  *(*(s1)+l1+l2) = '\0';
-}
-#endif
-
-#ifndef HAVE_TRIM
-
-/*
-** given strings s, s1 and s2 replaces occurrences of s1 in s by s2
-*/
-static void replaceFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  const char *z1;     /* string s (first parameter) */
-  const char *z2;     /* string s1 (second parameter) string to look for */
-  const char *z3;     /* string s2 (third parameter) string to replace occurrences of s1 with */
-  int lz1;
-  int lz2;
-  int lz3;
-  int lzo=0;
-  char *zo=0;
-  int ret=0;
-  const char *zt1;
-  const char *zt2;
-
-  assert( 3==argc );
-
-  if( SQLITE_NULL==wx_sqlite3_value_type(argv[0]) ){
-    wx_sqlite3_result_null(context);
-    return;
-  }
-
-  z1 = wx_sqlite3_value_text(argv[0]);
-  z2 = wx_sqlite3_value_text(argv[1]);
-  z3 = wx_sqlite3_value_text(argv[2]);
-  /* handle possible null values */
-  if( 0==z2 ){
-    z2="";
-  }
-  if( 0==z3 ){
-    z3="";
-  }
-
-  lz1 = strlen(z1);
-  lz2 = strlen(z2);
-  lz3 = strlen(z3);
-
-#if 0
-  /* special case when z2 is empty (or null) nothing will be changed */
-  if( 0==lz2 ){
-    wx_sqlite3_result_text(context, z1, -1, SQLITE_TRANSIENT);
-    return;
-  }
-#endif
-
-  zt1=z1;
-  zt2=z1;
-
-  while(1){
-    ret=_substr(z2,zt1 , 0, &zt2);
-
-    if( ret<0 )
-      break;
-
-    _append(&zo, lzo, zt1, zt2-zt1);
-    lzo+=zt2-zt1;
-    _append(&zo, lzo, z3, lz3);
-    lzo+=lz3;
-
-    zt1=zt2+lz2;
-  }
-  _append(&zo, lzo, zt1, lz1-(zt1-z1));
-  wx_sqlite3_result_text(context, zo, -1, SQLITE_TRANSIENT);
-  wx_sqlite3_free(zo);
-}
-#endif
-
-/*
-** given a string returns the same string but with the characters in reverse order
-*/
-static void reverseFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  const char *z;
-  const char *zt;
-  char *rz;
-  char *rzt;
-  int l = 0;
-  int i = 0;
-
-  assert( 1==argc );
-
-  if( SQLITE_NULL==wx_sqlite3_value_type(argv[0]) ){
-    wx_sqlite3_result_null(context);
-    return;
-  }
-  z = (char *)wx_sqlite3_value_text(argv[0]);
-  l = strlen(z);
-  rz = wx_sqlite3_malloc(l+1);
-  if (!rz){
-    wx_sqlite3_result_error_nomem(context);
-    return;
-  }
-  rzt = rz+l;
-  *(rzt--) = '\0';
-
-  zt=z;
-  while( sqliteCharVal((unsigned char *)zt)!=0 ){
-    z=zt;
-    sqliteNextChar(zt);
-    for(i=1; zt-i>=z; ++i){
-      *(rzt--)=*(zt-i);
-    }
-  }
-
-  wx_sqlite3_result_text(context, rz, -1, SQLITE_TRANSIENT);
-  wx_sqlite3_free(rz);
-}
-
-/*
-** An instance of the following structure holds the context of a
-** stdev() or variance() aggregate computation.
-** implementaion of http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Algorithm_II
-** less prone to rounding errors
-*/
-typedef struct StdevCtx StdevCtx;
-struct StdevCtx {
-  double rM;
-  double rS;
-  i64 cnt;          /* number of elements */
-};
-
-/*
-** An instance of the following structure holds the context of a
-** mode() or median() aggregate computation.
-** Depends on structures defined in map.c (see map & map)
-** These aggregate functions only work for integers and floats although
-** they could be made to work for strings. This is usually considered meaningless.
-** Only usuall order (for median), no use of collation functions (would this even make sense?)
-*/
-typedef struct ModeCtx ModeCtx;
-struct ModeCtx {
-  i64 riM;            /* integer value found so far */
-  double rdM;         /* double value found so far */
-  i64 cnt;            /* number of elements so far */
-  double pcnt;        /* number of elements smaller than a percentile */
-  i64 mcnt;           /* maximum number of occurrences (for mode) */
-  i64 mn;             /* number of occurrences (for mode and percentiles) */
-  i64 is_double;      /* whether the computation is being done for doubles (>0) or integers (=0) */
-  map* m;             /* map structure used for the computation */
-  int done;           /* whether the answer has been found */
-};
-
-/*
-** called for each value received during a calculation of stdev or variance
-*/
-static void varianceStep(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  StdevCtx *p;
-
-  double delta;
-  double x;
-
-  assert( argc==1 );
-  p = wx_sqlite3_aggregate_context(context, sizeof(*p));
-  /* only consider non-null values */
-  if( SQLITE_NULL != wx_sqlite3_value_numeric_type(argv[0]) ){
-    p->cnt++;
-    x = wx_sqlite3_value_double(argv[0]);
-    delta = (x-p->rM);
-    p->rM += delta/p->cnt;
-    p->rS += delta*(x-p->rM);
-  }
-}
-
-/*
-** called for each value received during a calculation of mode of median
-*/
-static void modeStep(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  ModeCtx *p;
-  i64 xi=0;
-  double xd=0.0;
-  i64 *iptr;
-  double *dptr;
-  int type;
-
-  assert( argc==1 );
-  type = wx_sqlite3_value_numeric_type(argv[0]);
-
-  if( type == SQLITE_NULL)
-    return;
-  
-  p = wx_sqlite3_aggregate_context(context, sizeof(*p));
-
-  if( 0==(p->m) ){
-    p->m = calloc(1, sizeof(map));
-    if( type==SQLITE_INTEGER ){
-      /* map will be used for integers */
-      *(p->m) = map_make(int_cmp);
-      p->is_double = 0;
-    }else{
-      p->is_double = 1;
-      /* map will be used for doubles */
-      *(p->m) = map_make(double_cmp);
-    }
-  }
-
-  ++(p->cnt);
-
-  if( 0==p->is_double ){
-    xi = wx_sqlite3_value_int64(argv[0]);
-    iptr = (i64*)calloc(1,sizeof(i64));
-    *iptr = xi;
-    map_insert(p->m, iptr);
-  }else{
-    xd = wx_sqlite3_value_double(argv[0]);
-    dptr = (double*)calloc(1,sizeof(double));
-    *dptr = xd;
-    map_insert(p->m, dptr);
-  }
-}
-
-/*
-**  Auxiliary function that iterates all elements in a map and finds the mode
-**  (most frequent value)
-*/
-static void modeIterate(void* e, i64 c, void* pp){
-  i64 ei;
-  double ed;
-  ModeCtx *p = (ModeCtx*)pp;
-  
-  if( 0==p->is_double ){
-    ei = *(int*)(e);
-
-	if( p->mcnt==c ){
-      ++p->mn;
-    }else if( p->mcnt<c ){
-      p->riM = ei;
-      p->mcnt = c;
-	  p->mn=1;
-    }
-  }else{
-    ed = *(double*)(e);
-
-	if( p->mcnt==c ){
-      ++p->mn;
-    }else if(p->mcnt<c){
-      p->rdM = ed;
-      p->mcnt = c;
-	  p->mn=1;
-    }
-  }
-}
-
-/*
-**  Auxiliary function that iterates all elements in a map and finds the median
-**  (the value such that the number of elements smaller is equal the the number of 
-**  elements larger)
-*/
-static void medianIterate(void* e, i64 c, void* pp){
-  i64 ei;
-  double ed;
-  double iL;
-  double iR;
-  int il;
-  int ir;
-  ModeCtx *p = (ModeCtx*)pp;
-
-  if(p->done>0)
-    return;
-
-  iL = p->pcnt;
-  iR = p->cnt - p->pcnt;
-  il = p->mcnt + c;
-  ir = p->cnt - p->mcnt;
-
-  if( il >= iL ){
-    if( ir >= iR ){
-    ++p->mn;
-      if( 0==p->is_double ){
-        ei = *(int*)(e);
-        p->riM += ei;
-      }else{
-        ed = *(double*)(e);
-        p->rdM += ed;
-      }
-    }else{
-      p->done=1;
-    }
-  }
-  p->mcnt+=c;
-}
-
-/*
-** Returns the mode value
-*/
-static void modeFinalize(wx_sqlite3_context *context){
-  ModeCtx *p;
-  p = wx_sqlite3_aggregate_context(context, 0);
-  if( p && p->m ){
-    map_iterate(p->m, modeIterate, p);
-    map_destroy(p->m);
-    free(p->m);
-
-    if( 1==p->mn ){
-      if( 0==p->is_double )
-        wx_sqlite3_result_int64(context, p->riM);
-      else
-        wx_sqlite3_result_double(context, p->rdM);
-    }
-  }
-}
-
-/*
-** auxiliary function for percentiles
-*/
-static void _medianFinalize(wx_sqlite3_context *context){
-  ModeCtx *p;
-  p = (ModeCtx*) wx_sqlite3_aggregate_context(context, 0);
-  if( p && p->m ){
-    p->done=0;
-    map_iterate(p->m, medianIterate, p);
-    map_destroy(p->m);
-    free(p->m);
-
-    if( 0==p->is_double )
-      if( 1==p->mn )
-      	wx_sqlite3_result_int64(context, p->riM);
-      else
-      	wx_sqlite3_result_double(context, p->riM*1.0/p->mn);
-    else
-      wx_sqlite3_result_double(context, p->rdM/p->mn);
-  }
-}
-
-/*
-** Returns the median value
-*/
-static void medianFinalize(wx_sqlite3_context *context){
-  ModeCtx *p;
-  p = (ModeCtx*) wx_sqlite3_aggregate_context(context, 0);
-  if( p!=0 ){
-    p->pcnt = (p->cnt)/2.0;
-    _medianFinalize(context);
-  }
-}
-
-/*
-** Returns the lower_quartile value
-*/
-static void lower_quartileFinalize(wx_sqlite3_context *context){
-  ModeCtx *p;
-  p = (ModeCtx*) wx_sqlite3_aggregate_context(context, 0);
-  if( p!=0 ){
-    p->pcnt = (p->cnt)/4.0;
-    _medianFinalize(context);
-  }
-}
-
-/*
-** Returns the upper_quartile value
-*/
-static void upper_quartileFinalize(wx_sqlite3_context *context){
-  ModeCtx *p;
-  p = (ModeCtx*) wx_sqlite3_aggregate_context(context, 0);
-  if( p!=0 ){
-    p->pcnt = (p->cnt)*3/4.0;
-    _medianFinalize(context);
-  }
-}
-
-/*
-** Returns the stdev value
-*/
-static void stdevFinalize(wx_sqlite3_context *context){
-  StdevCtx *p;
-  p = wx_sqlite3_aggregate_context(context, 0);
-  if( p && p->cnt>1 ){
-    wx_sqlite3_result_double(context, sqrt(p->rS/(p->cnt-1)));
-  }else{
-    wx_sqlite3_result_double(context, 0.0);
-  }
-}
-
-/*
-** Returns the variance value
-*/
-static void varianceFinalize(wx_sqlite3_context *context){
-  StdevCtx *p;
-  p = wx_sqlite3_aggregate_context(context, 0);
-  if( p && p->cnt>1 ){
-    wx_sqlite3_result_double(context, p->rS/(p->cnt-1));
-  }else{
-    wx_sqlite3_result_double(context, 0.0);
-  }
-}
-
-#ifdef SQLITE_SOUNDEX
-
-/* relicoder factored code */
-/*
-** Calculates the soundex value of a string
-*/
-
-static void soundex(const u8 *zIn, char *zResult){
-  int i, j;
-  static const unsigned char iCode[] = {
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 1, 2, 3, 0, 1, 2, 0, 0, 2, 2, 4, 5, 5, 0,
-    1, 2, 6, 2, 3, 0, 1, 0, 2, 0, 2, 0, 0, 0, 0, 0,
-    0, 0, 1, 2, 3, 0, 1, 2, 0, 0, 2, 2, 4, 5, 5, 0,
-    1, 2, 6, 2, 3, 0, 1, 0, 2, 0, 2, 0, 0, 0, 0, 0,
-  };
-
-  for(i=0; zIn[i] && !isalpha(zIn[i]); i++){}
-  if( zIn[i] ){
-    zResult[0] = toupper(zIn[i]);
-    for(j=1; j<4 && zIn[i]; i++){
-      int code = iCode[zIn[i]&0x7f];
-      if( code>0 ){
-        zResult[j++] = code + '0';
-      }
-    }
-    while( j<4 ){
-      zResult[j++] = '0';
-    }
-    zResult[j] = 0;
-  }else{
-    strcpy(zResult, "?000");
-  }
-}
-
-/*
-** computes the number of different characters between the soundex value fo 2 strings
-*/
-static void differenceFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  char zResult1[8];
-  char zResult2[8];
-  char *zR1 = zResult1;
-  char *zR2 = zResult2;
-  int rVal = 0;
-  int i = 0;
-  const u8 *zIn1;
-  const u8 *zIn2;
-
-  assert( argc==2 );
-  
-  if( wx_sqlite3_value_type(argv[0])==SQLITE_NULL || wx_sqlite3_value_type(argv[1])==SQLITE_NULL ){
-    wx_sqlite3_result_null(context);
-    return;
-  }
-  
-  zIn1 = (u8*)wx_sqlite3_value_text(argv[0]);
-  zIn2 = (u8*)wx_sqlite3_value_text(argv[1]);
-
-  soundex(zIn1, zR1);
-  soundex(zIn2, zR2);
-
-  for(i=0; i<4; ++i){
-    if( sqliteCharVal((unsigned char *)zR1)==sqliteCharVal((unsigned char *)zR2) )
-      ++rVal;
-    sqliteNextChar(zR1);
-    sqliteNextChar(zR2);
-  }
-  wx_sqlite3_result_int(context, rVal);
-}
-#endif
-
-static void lastRowsFunc(wx_sqlite3_context *context, int argc, wx_sqlite3_value **argv){
-  wx_sqlite3 *db = wx_sqlite3_context_db_handle(context);
-  wx_sqlite3_result_int64(context, wx_sqlite3_changes(db));
-}
-
-/*
-** This function registered all of the above C functions as SQL
-** functions.  This should be the only routine in this file with
-** external linkage.
-*/
-int RegisterExtensionFunctions(wx_sqlite3 *db){
-  static const struct FuncDef {
-     char *zName;
-     signed char nArg;
-     u8 argType;           /* 0: none.  1: db  2: (-1) */
-     u8 eTextRep;          /* 1: UTF-16.  0: UTF-8 */
-     u8 needCollSeq;
-     void (*xFunc)(wx_sqlite3_context*,int,wx_sqlite3_value **);
-  } aFuncs[] = {
-    /* math.h */
-    { "acos",               1, 0, SQLITE_UTF8,    0, acosFunc  },
-    { "asin",               1, 0, SQLITE_UTF8,    0, asinFunc  },
-    { "atan",               1, 0, SQLITE_UTF8,    0, atanFunc  },
-    { "atn2",               2, 0, SQLITE_UTF8,    0, atn2Func  },
-    /* XXX alias */
-    { "atan2",              2, 0, SQLITE_UTF8,    0, atn2Func  },
-    { "acosh",              1, 0, SQLITE_UTF8,    0, acoshFunc  },
-    { "asinh",              1, 0, SQLITE_UTF8,    0, asinhFunc  },
-    { "atanh",              1, 0, SQLITE_UTF8,    0, atanhFunc  },
-
-    { "difference",         2, 0, SQLITE_UTF8,    0, differenceFunc},
-    { "degrees",            1, 0, SQLITE_UTF8,    0, rad2degFunc  },
-    { "radians",            1, 0, SQLITE_UTF8,    0, deg2radFunc  },
-
-    { "cos",                1, 0, SQLITE_UTF8,    0, cosFunc  },
-    { "sin",                1, 0, SQLITE_UTF8,    0, sinFunc },
-    { "tan",                1, 0, SQLITE_UTF8,    0, tanFunc },
-    { "cot",                1, 0, SQLITE_UTF8,    0, cotFunc },
-    { "cosh",               1, 0, SQLITE_UTF8,    0, coshFunc  },
-    { "sinh",               1, 0, SQLITE_UTF8,    0, sinhFunc },
-    { "tanh",               1, 0, SQLITE_UTF8,    0, tanhFunc },
-    { "coth",               1, 0, SQLITE_UTF8,    0, cothFunc },
-
-    { "exp",                1, 0, SQLITE_UTF8,    0, expFunc  },
-    { "log",                1, 0, SQLITE_UTF8,    0, logFunc  },
-    { "ln",                 1, 0, SQLITE_UTF8,    0, logFunc  },
-    { "log10",              1, 0, SQLITE_UTF8,    0, log10Func  },
-    { "power",              2, 0, SQLITE_UTF8,    0, powerFunc  },
-    { "sign",               1, 0, SQLITE_UTF8,    0, signFunc },
-    { "sqrt",               1, 0, SQLITE_UTF8,    0, sqrtFunc },
-    { "square",             1, 0, SQLITE_UTF8,    0, squareFunc },
-
-    { "ceil",               1, 0, SQLITE_UTF8,    0, ceilFunc },
-    { "ceiling",            1, 0, SQLITE_UTF8,    0, ceilFunc },
-    { "floor",              1, 0, SQLITE_UTF8,    0, floorFunc },
-
-    { "pi",                 0, 0, SQLITE_UTF8,    1, piFunc },
-
-    { "last_rows_affected", 0, 0, SQLITE_UTF8,    0, lastRowsFunc },
-
-    /* string */
-    { "replicate",          2, 0, SQLITE_UTF8,    0, replicateFunc },
-    { "charindex",          2, 0, SQLITE_UTF8,    0, charindexFunc },
-    { "charindex",          3, 0, SQLITE_UTF8,    0, charindexFunc },
-    { "leftstr",            2, 0, SQLITE_UTF8,    0, leftFunc },
-    { "rightstr",           2, 0, SQLITE_UTF8,    0, rightFunc },
-#ifndef HAVE_TRIM
-    { "ltrim",              1, 0, SQLITE_UTF8,    0, ltrimFunc },
-    { "rtrim",              1, 0, SQLITE_UTF8,    0, rtrimFunc },
-    { "trim",               1, 0, SQLITE_UTF8,    0, trimFunc },
-    { "replace",            3, 0, SQLITE_UTF8,    0, replaceFunc },
-#endif
-    { "reverse",            1, 0, SQLITE_UTF8,    0, reverseFunc },
-    { "proper",             1, 0, SQLITE_UTF8,    0, properFunc },
-    { "padl",               2, 0, SQLITE_UTF8,    0, padlFunc },
-    { "padr",               2, 0, SQLITE_UTF8,    0, padrFunc },
-    { "padc",               2, 0, SQLITE_UTF8,    0, padcFunc },
-    { "strfilter",          2, 0, SQLITE_UTF8,    0, strfilterFunc },
-
-  };
-  /* Aggregate functions */
-  static const struct FuncDefAgg {
-    char *zName;
-    signed char nArg;
-    u8 argType;
-    u8 needCollSeq;
-    void (*xStep)(wx_sqlite3_context*,int,wx_sqlite3_value**);
-    void (*xFinalize)(wx_sqlite3_context*);
-  } aAggs[] = {
-    { "stdev",            1, 0, 0, varianceStep, stdevFinalize  },
-    { "variance",         1, 0, 0, varianceStep, varianceFinalize  },
-    { "mode",             1, 0, 0, modeStep,     modeFinalize  },
-    { "median",           1, 0, 0, modeStep,     medianFinalize  },
-    { "lower_quartile",   1, 0, 0, modeStep,     lower_quartileFinalize  },
-    { "upper_quartile",   1, 0, 0, modeStep,     upper_quartileFinalize  },
-  };
-  int i;
-
-  for(i=0; i<sizeof(aFuncs)/sizeof(aFuncs[0]); i++){
-    void *pArg = 0;
-    switch( aFuncs[i].argType ){
-      case 1: pArg = db; break;
-      case 2: pArg = (void *)(-1); break;
-    }
-    /* wx_sqlite3CreateFunc */
-    /* LMH no error checking */
-    wx_sqlite3_create_function(db, aFuncs[i].zName, aFuncs[i].nArg,
-        aFuncs[i].eTextRep, pArg, aFuncs[i].xFunc, 0, 0);
-#if 0
-    if( aFuncs[i].needCollSeq ){
-      struct FuncDef *pFunc = wx_sqlite3FindFunction(db, aFuncs[i].zName, 
-          strlen(aFuncs[i].zName), aFuncs[i].nArg, aFuncs[i].eTextRep, 0);
-      if( pFunc && aFuncs[i].needCollSeq ){
-        pFunc->needCollSeq = 1;
-      }
-    }
-#endif
-  }
-
-  for(i=0; i<sizeof(aAggs)/sizeof(aAggs[0]); i++){
-    void *pArg = 0;
-    switch( aAggs[i].argType ){
-      case 1: pArg = db; break;
-      case 2: pArg = (void *)(-1); break;
-    }
-    /* wx_sqlite3CreateFunc */
-    /* LMH no error checking */
-    wx_sqlite3_create_function(db, aAggs[i].zName, aAggs[i].nArg, SQLITE_UTF8, 
-        pArg, 0, aAggs[i].xStep, aAggs[i].xFinalize);
-#if 0
-    if( aAggs[i].needCollSeq ){
-      struct FuncDefAgg *pFunc = wx_sqlite3FindFunction( db, aAggs[i].zName,
-          strlen(aAggs[i].zName), aAggs[i].nArg, SQLITE_UTF8, 0);
-      if( pFunc && aAggs[i].needCollSeq ){
-        pFunc->needCollSeq = 1;
-      }
-    }
-#endif
-  }
-  return 0;
-}
-
-#ifdef COMPILE_SQLITE_EXTENSIONS_AS_LOADABLE_MODULE
-int wx_sqlite3_extension_init(
-    wx_sqlite3 *db, char **pzErrMsg, const wx_sqlite3_api_routines *pApi){
-  SQLITE_EXTENSION_INIT2(pApi);
-  RegisterExtensionFunctions(db);
-  return 0;
-}
-#endif /* COMPILE_SQLITE_EXTENSIONS_AS_LOADABLE_MODULE */
-
-map map_make(cmp_func cmp){
-  map r;
-  r.cmp=cmp;
-  r.base = 0;
-
-  return r;
-}
-
-void* xcalloc(size_t nmemb, size_t size, char* s){
-  void* ret = calloc(nmemb, size);
-  return ret;
-}
-
-void xfree(void* p){
-  free(p);
-}
-
-void node_insert(node** n, cmp_func cmp, void *e){
-  int c;
-  node* nn;
-  if(*n==0){
-    nn = (node*)xcalloc(1,sizeof(node), "for node");
-    nn->data = e;
-    nn->count = 1;
-    *n=nn;
-  }else{
-    c=cmp((*n)->data,e);
-    if(0==c){
-      ++((*n)->count);
-      xfree(e);
-    }else if(c>0){
-      /* put it right here */
-      node_insert(&((*n)->l), cmp, e);
-    }else{
-      node_insert(&((*n)->r), cmp, e);
-    }
-  }
-}
-
-void map_insert(map *m, void *e){
-  node_insert(&(m->base), m->cmp, e);
-}
-
-void node_iterate(node *n, map_iterator iter, void* p){
-  if(n){
-    if(n->l)
-      node_iterate(n->l, iter, p);
-    iter(n->data, n->count, p);
-    if(n->r)
-      node_iterate(n->r, iter, p);
-  }
-}
-
-void map_iterate(map *m, map_iterator iter, void* p){
-  node_iterate(m->base, iter, p);
-}
-
-void node_destroy(node *n){
-  if(0!=n){
-    xfree(n->data);
-    if(n->l)
-      node_destroy(n->l);
-    if(n->r)
-      node_destroy(n->r);
-
-    xfree(n);
-  }
-}
-
-void map_destroy(map *m){
-  node_destroy(m->base);
-}
-
-int int_cmp(const void *a, const void *b){
-  i64 aa = *(i64 *)(a);
-  i64 bb = *(i64 *)(b);
-  /* printf("cmp %d <=> %d\n",aa,bb); */
-  if(aa==bb)
-    return 0;
-  else if(aa<bb)
-    return -1;
-  else
-    return 1;
-}
-
-int double_cmp(const void *a, const void *b){
-  double aa = *(double *)(a);
-  double bb = *(double *)(b);
-  /* printf("cmp %d <=> %d\n",aa,bb); */
-  if(aa==bb)
-    return 0;
-  else if(aa<bb)
-    return -1;
-  else
-    return 1;
-}
-
-void print_elem(void *e, i64 c, void* p){
-  int ee = *(int*)(e);
-  printf("%d => %lld\n", ee,c);
-}
-
-