SQLite

**     CREATE INDEX
**     DROP INDEX
**     creating ID lists
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**
** $Id: build.c,v 1.427 2007/05/08 13:58:27 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called when a new SQL statement is beginning to
** be parsed.  Initialize the pParse structure as needed.

*/
void sqlite3AddColumn(Parse *pParse, Token *pName){
  Table *p;
  int i;
  char *z;
  Column *pCol;
  if( (p = pParse->pNewTable)==0 ) return;
  if( p->nCol+1>SQLITE_MAX_COLUMN ){
    sqlite3ErrorMsg(pParse, "too many columns on %s", p->zName);
    return;
  }
  z = sqlite3NameFromToken(pName);
  if( z==0 ) return;
  for(i=0; i<p->nCol; i++){
    if( STRICMP(z, p->aCol[i].zName) ){
      sqlite3ErrorMsg(pParse, "duplicate column name: %s", z);
      sqliteFree(z);
      return;

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** 
** This file defines various limits of what SQLite can process.
**
** @(#) $Id: limits.h,v 1.2 2007/05/08 13:58:28 drh Exp $
*/

/*
** The maximum length of a TEXT or BLOB in bytes.   This also
** limits the size of a row in a table or index.
**
** The hard limit is the ability of a 32-bit signed integer

** The hard upper limit here is 32676.  Most database people will
** tell you that in a well-normalized database, you usually should
** not have more than a dozen or so columns in any table.  And if
** that is the case, there is no point in having more than a few
** dozen values in any of the other situations described above.
*/
#ifndef SQLITE_MAX_COLUMN
# define SQLITE_MAX_COLUMN 2000
#endif

/*
** The maximum length of a single SQL statement in bytes.
** The hard limit here is the same as SQLITE_MAX_LENGTH.
*/
#ifndef SQLITE_MAX_SQL_LENGTH

**
*************************************************************************
** This file contains SQLite's grammar for SQL.  Process this file
** using the lemon parser generator to generate C code that runs
** the parser.  Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.223 2007/05/08 13:58:28 drh Exp $
*/

// All token codes are small integers with #defines that begin with "TK_"
%token_prefix TK_

// The type of the data attached to each token is Token.  This is also the
// default type for non-terminals.

%ifndef SQLITE_OMIT_CAST
expr(A) ::= CAST(X) LP expr(E) AS typetoken(T) RP(Y). {
  A = sqlite3Expr(TK_CAST, E, 0, &T);
  sqlite3ExprSpan(A,&X,&Y);
}
%endif  SQLITE_OMIT_CAST
expr(A) ::= ID(X) LP distinct(D) exprlist(Y) RP(E). {
  if( Y->nExpr>SQLITE_MAX_FUNCTION_ARG ){
    sqlite3ErrorMsg(pParse, "too many arguments on function %T", &X);
    sqlite3ExprListDelete(Y);
    A = 0;
  }else{
    A = sqlite3ExprFunction(Y, &X);
    sqlite3ExprSpan(A,&X,&E);
    if( D && A ){
      A->flags |= EP_Distinct;
    }
  }
}
expr(A) ::= ID(X) LP STAR RP(E). {
  A = sqlite3ExprFunction(0, &X);
  sqlite3ExprSpan(A,&X,&E);
}
term(A) ::= CTIME_KW(OP). {

**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains the implementation of the sqlite3_prepare()
** interface, and routines that contribute to loading the database schema
** from disk.
**
** $Id: prepare.c,v 1.49 2007/05/08 13:58:28 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** Fill the InitData structure with an error message that indicates

      return SQLITE_LOCKED;
    }
  }
  
  memset(&sParse, 0, sizeof(sParse));
  sParse.db = db;
  if( nBytes>=0 && zSql[nBytes]!=0 ){
    char *zSqlCopy;
    if( nBytes>SQLITE_MAX_SQL_LENGTH ){
      return SQLITE_TOOBIG;
    }
    zSqlCopy = sqlite3StrNDup(zSql, nBytes);
    if( zSqlCopy ){
      sqlite3RunParser(&sParse, zSqlCopy, &zErrMsg);
      sqliteFree(zSqlCopy);
    }
    sParse.zTail = &zSql[nBytes];
  }else{
    sqlite3RunParser(&sParse, zSql, &zErrMsg);

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle SELECT statements in SQLite.
**
** $Id: select.c,v 1.342 2007/05/08 13:58:28 drh Exp $
*/
#include "sqliteInt.h"


/*
** Delete all the content of a Select structure but do not deallocate
** the select structure itself.

        }
        sqliteFree(zTName);
      }
    }
    sqlite3ExprListDelete(pEList);
    p->pEList = pNew;
  }
  if( p->pEList && p->pEList->nExpr>SQLITE_MAX_COLUMN ){
    sqlite3ErrorMsg(pParse, "too many columns in result set");
    rc = SQLITE_ERROR;
  }
  return rc;
}

#ifndef SQLITE_OMIT_COMPOUND_SELECT
/*
** This routine associates entries in an ORDER BY expression list with
** columns in a result.  For each ORDER BY expression, the opcode of

){
  int i;
  ExprList *pEList = pNC->pEList;     /* The result set of the SELECT */
  Parse *pParse = pNC->pParse;     /* The result set of the SELECT */
  assert( pEList );

  if( pOrderBy==0 ) return 0;
  if( pOrderBy->nExpr>SQLITE_MAX_COLUMN ){
    sqlite3ErrorMsg(pParse, "too many terms in %s BY clause", zType);
    return 1;
  }
  for(i=0; i<pOrderBy->nExpr; i++){
    int iCol;
    Expr *pE = pOrderBy->a[i].pExpr;
    if( sqlite3ExprIsInteger(pE, &iCol) ){
      if( iCol>0 && iCol<=pEList->nExpr ){
        CollSeq *pColl = pE->pColl;
        int flags = pE->flags & EP_ExpCollate;

*************************************************************************
** 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 1.127 2007/05/08 13:58:28 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include <stdlib.h>

/*

  pParse->zTail = pParse->zSql = zSql;
  while( !sqlite3MallocFailed() && zSql[i]!=0 ){
    assert( i>=0 );
    pParse->sLastToken.z = (u8*)&zSql[i];
    assert( pParse->sLastToken.dyn==0 );
    pParse->sLastToken.n = getToken((unsigned char*)&zSql[i],&tokenType);
    i += pParse->sLastToken.n;
    if( i>SQLITE_MAX_SQL_LENGTH ){
      pParse->rc = SQLITE_TOOBIG;
      break;
    }
    switch( tokenType ){
      case TK_SPACE:
      case TK_COMMENT: {
        if( db->u1.isInterrupted ){
          pParse->rc = SQLITE_INTERRUPT;
          sqlite3SetString(pzErrMsg, "interrupt", (char*)0);
          goto abort_parse;