File ext/misc/anycollseq.c from the latest check-in

** 2017-04-16
** 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.
** This file implements a run-time loadable extension to SQLite that
** registers a sqlite3_collation_needed() callback to register a fake
** collating function for any unknown collating sequence.  The fake
** collating function works like BINARY.
** This extension can be used to load schemas that contain one or more
** unknown collating sequences.
#include "sqlite3ext.h"
#include <string.h>

static int anyCollFunc(
  void *NotUsed,
  int nKey1, const void *pKey1,
  int nKey2, const void *pKey2
  int rc, n;
  n = nKey1<nKey2 ? nKey1 : nKey2;
  rc = memcmp(pKey1, pKey2, n);
  if( rc==0 ) rc = nKey1 - nKey2;
  return rc;

static void anyCollNeeded(
  void *NotUsed,
  sqlite3 *db,
  int eTextRep,
  const char *zCollName
  sqlite3_create_collation(db, zCollName, eTextRep, 0, anyCollFunc); 

#ifdef _WIN32
int sqlite3_anycollseq_init(
  sqlite3 *db, 
  char **pzErrMsg, 
  const sqlite3_api_routines *pApi
  int rc = SQLITE_OK;
  rc = sqlite3_collation_needed(db, 0, anyCollNeeded);
  return rc;