SQLite

**     COPY
**     VACUUM
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.138 2003/03/31 02:12:47 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called when a new SQL statement is beginning to
** be parsed.  Check to see if the schema for the database needs

  Vdbe *v;
  sqlite *db = pParse->db;

  if( pParse->nErr || sqlite_malloc_failed ) return;
  assert( pName->nSrc==1 );
  pIndex = sqliteFindIndex(db, pName->a[0].zName, pName->a[0].zDatabase);
  if( pIndex==0 ){
    sqliteErrorMsg(pParse, "no such index: %S", pName, 0);

    goto exit_drop_index;
  }
  if( pIndex->autoIndex ){
    sqliteErrorMsg(pParse, "index associated with UNIQUE "
      "or PRIMARY KEY constraint cannot be dropped", 0);

    goto exit_drop_index;
  }
  if( pIndex->iDb>1 ){
    sqliteErrorMsg(pParse, "cannot alter schema of attached "
       "databases", 0);

    goto exit_drop_index;
  }
#ifndef SQLITE_OMIT_AUTHORIZATION
  {
    int code = SQLITE_DROP_INDEX;
    Table *pTab = pIndex->pTable;
    if( sqliteAuthCheck(pParse, SQLITE_DELETE, SCHEMA_TABLE(pIndex->iDb), 0) ){

void sqliteBeginTransaction(Parse *pParse, int onError){
  sqlite *db;

  if( pParse==0 || (db=pParse->db)==0 || db->aDb[0].pBt==0 ) return;
  if( pParse->nErr || sqlite_malloc_failed ) return;
  if( sqliteAuthCheck(pParse, SQLITE_TRANSACTION, "BEGIN", 0) ) return;
  if( db->flags & SQLITE_InTrans ){

    sqliteErrorMsg(pParse, "cannot start a transaction within a transaction");

    return;
  }
  sqliteBeginWriteOperation(pParse, 0, 0);
  db->flags |= SQLITE_InTrans;
  db->onError = onError;
}

/*
** Commit a transaction
*/
void sqliteCommitTransaction(Parse *pParse){
  sqlite *db;

  if( pParse==0 || (db=pParse->db)==0 || db->aDb[0].pBt==0 ) return;
  if( pParse->nErr || sqlite_malloc_failed ) return;
  if( sqliteAuthCheck(pParse, SQLITE_TRANSACTION, "COMMIT", 0) ) return;
  if( (db->flags & SQLITE_InTrans)==0 ){


    sqliteErrorMsg(pParse, "cannot commit - no transaction is active");
    return;
  }
  db->flags &= ~SQLITE_InTrans;
  sqliteEndWriteOperation(pParse);
  db->onError = OE_Default;
}

/*
** Rollback a transaction
*/
void sqliteRollbackTransaction(Parse *pParse){
  sqlite *db;
  Vdbe *v;

  if( pParse==0 || (db=pParse->db)==0 || db->aDb[0].pBt==0 ) return;
  if( pParse->nErr || sqlite_malloc_failed ) return;
  if( sqliteAuthCheck(pParse, SQLITE_TRANSACTION, "ROLLBACK", 0) ) return;
  if( (db->flags & SQLITE_InTrans)==0 ){


    sqliteErrorMsg(pParse, "cannot rollback - no transaction is active");
    return; 
  }
  v = sqliteGetVdbe(pParse);
  if( v ){
    sqliteVdbeAddOp(v, OP_Rollback, 0, 0);
  }
  db->flags &= ~SQLITE_InTrans;

  
  zName = 0;
  sqliteSetNString(&zName, pDbname->z, pDbname->n, 0);
  if( zName==0 ) return;
  sqliteDequote(zName);
  for(i=0; i<db->nDb; i++){
    if( db->aDb[i].zName && sqliteStrICmp(db->aDb[i].zName, zName)==0 ){

      sqliteErrorMsg(pParse, "database %z is already in use", zName);


      return;
    }
  }
  aNew->zName = zName;
  zFile = 0;
  sqliteSetNString(&zFile, pFilename->z, pFilename->n, 0);
  if( zFile==0 ) return;
  sqliteDequote(zFile);
  rc = sqliteBtreeOpen(zFile, 0, MAX_PAGES, &aNew->pBt);
  if( rc ){
    sqliteErrorMsg(pParse, "unable to open database: %s", zFile);

  }
  sqliteFree(zFile);
  db->flags &= ~SQLITE_Initialized;
  if( pParse->nErr ) return;
  rc = sqliteInit(pParse->db, &pParse->zErrMsg);
  if( rc ){
    pParse->nErr++;

  db = pParse->db;
  for(i=0; i<db->nDb; i++){
    if( db->aDb[i].pBt==0 || db->aDb[i].zName==0 ) continue;
    if( strlen(db->aDb[i].zName)!=pDbname->n ) continue;
    if( sqliteStrNICmp(db->aDb[i].zName, pDbname->z, pDbname->n)==0 ) break;
  }
  if( i>=db->nDb ){
    sqliteErrorMsg(pParse, "no such database: %T", pDbname);


    return;
  }
  if( i<2 ){
    sqliteErrorMsg(pParse, "cannot detached database %T", pDbname);

    return;
  }
  sqliteBtreeClose(db->aDb[i].pBt);
  db->aDb[i].pBt = 0;
  sqliteResetInternalSchema(db, 0);
}

**    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 DELETE FROM statements.
**
** $Id: delete.c,v 1.50 2003/03/31 02:12:47 drh Exp $
*/
#include "sqliteInt.h"

/*
** Look up every table that is named in pSrc.  If any table is not found,
** add an error message to pParse->zErrMsg and return NULL.  If all tables
** are found, return a pointer to the last table.
*/
Table *sqliteSrcListLookup(Parse *pParse, SrcList *pSrc){
  Table *pTab = 0;
  int i;
  for(i=0; i<pSrc->nSrc; i++){
    const char *zTab = pSrc->a[i].zName;
    const char *zDb = pSrc->a[i].zDatabase;
    pTab = sqliteFindTable(pParse->db, zTab, zDb);
    if( pTab==0 ){

      sqliteErrorMsg(pParse, "no such table: %S", pSrc, 0);




      break;
    }
    pSrc->a[i].pTab = pTab;
  }
  return pTab;
}

/*
** Check to make sure the given table is writable.  If it is not
** writable, generate an error message and return 1.  If it is
** writable return 0;
*/
int sqliteIsReadOnly(Parse *pParse, Table *pTab){
  if( pTab->readOnly || pTab->pSelect ){
    sqliteErrorMsg(pParse, "%s %s may not be modified",
      pTab->pSelect ? "view" : "table",

      pTab->zName);
    return 1;
  }
  return 0;
}

/*
** Process a DELETE FROM statement.

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains routines used for analyzing expressions and
** for generating VDBE code that evaluates expressions in SQLite.
**
** $Id: expr.c,v 1.91 2003/03/31 02:12:47 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** Construct a new expression node and return a pointer to it.  Memory
** for this node is obtained from sqliteMalloc().  The calling function

        pExpr->iTable = base;
        cnt = 1 + (pTabList->nSrc>1);
        pExpr->op = TK_COLUMN;
        pExpr->dataType = SQLITE_SO_NUM;
      }
      sqliteFree(z);
      if( cnt==0 && pExpr->token.z[0]!='"' ){
        sqliteErrorMsg(pParse, "no such column: %T", &pExpr->token);


        return 1;
      }else if( cnt>1 ){
        sqliteErrorMsg(pParse, "ambiguous column name: %T", &pExpr->token);


        return 1;
      }
      if( pExpr->op==TK_COLUMN ){
        sqliteAuthRead(pParse, pExpr, pTabList, base);
      }
      break; 
    }

        pExpr->iColumn = -1;
        pExpr->dataType = SQLITE_SO_NUM;
      }
      sqliteFree(zDb);
      sqliteFree(zLeft);
      sqliteFree(zRight);
      if( cnt==0 ){
        sqliteErrorMsg(pParse, "no such column: %T.%T",

               &pLeft->token, &pRight->token);

        return 1;
      }else if( cnt>1 ){
        sqliteErrorMsg(pParse, "ambiguous column name: %T.%T",

          &pLeft->token, &pRight->token);

        return 1;
      }
      sqliteExprDelete(pExpr->pLeft);
      pExpr->pLeft = 0;
      sqliteExprDelete(pExpr->pRight);
      pExpr->pRight = 0;
      pExpr->op = TK_COLUMN;

        ** Create a set to put the exprlist values in.  The Set id is stored
        ** in iTable.
        */
        int i, iSet;
        for(i=0; i<pExpr->pList->nExpr; i++){
          Expr *pE2 = pExpr->pList->a[i].pExpr;
          if( !sqliteExprIsConstant(pE2) ){
            sqliteErrorMsg(pParse,
              "right-hand side of IN operator must be constant");

            return 1;
          }
          if( sqliteExprCheck(pParse, pE2, 0, 0) ){
            return 1;
          }
        }
        iSet = pExpr->iTable = pParse->nSet++;

        sqliteVdbeAddOp(v, OP_String, 0, 0);
      }
      sqliteVdbeResolveLabel(v, expr_end_label);
      break;
    }
    case TK_RAISE: {
      if( !pParse->trigStack ){
        sqliteErrorMsg(pParse,
                       "RAISE() may only be used within a trigger-program");
        pParse->nErr++;
	return;
      }
      if( pExpr->iColumn == OE_Rollback ||
	  pExpr->iColumn == OE_Abort ||
	  pExpr->iColumn == OE_Fail ){
	  char * msg = sqliteStrNDup(pExpr->token.z, pExpr->token.n);

**    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 INSERT statements in SQLite.
**
** $Id: insert.c,v 1.77 2003/03/31 02:12:47 drh Exp $
*/
#include "sqliteInt.h"

/*
** This routine is call to handle SQL of the following forms:
**
**    insert into TABLE (IDLIST) values(EXPRLIST)

  *  (b) that if it is a view then ON INSERT triggers exist
  */
  row_triggers_exist = 
    sqliteTriggersExist(pParse, pTab->pTrigger, TK_INSERT, 
        TK_BEFORE, TK_ROW, 0) ||
    sqliteTriggersExist(pParse, pTab->pTrigger, TK_INSERT, TK_AFTER, TK_ROW, 0);
  if( pTab->readOnly || (pTab->pSelect && !row_triggers_exist) ){
    sqliteErrorMsg(pParse, "%s %s may not be modified",
      pTab->pSelect ? "view" : "table",
      zTab);


    goto insert_cleanup;
  }

  if( pTab==0 ) goto insert_cleanup;

  /* If pTab is really a view, make sure it has been initialized.
  */

    }
  }

  /* Make sure the number of columns in the source data matches the number
  ** of columns to be inserted into the table.
  */
  if( pColumn==0 && nColumn!=pTab->nCol ){




    sqliteErrorMsg(pParse, 

       "table %S has %d columns but %d values were supplied",
       pTabList, 0, pTab->nCol, nColumn);
    goto insert_cleanup;
  }
  if( pColumn!=0 && nColumn!=pColumn->nId ){



    sqliteErrorMsg(pParse, "%d values for %d columns", nColumn, pColumn->nId);



    goto insert_cleanup;
  }

  /* If the INSERT statement included an IDLIST term, then make sure
  ** all elements of the IDLIST really are columns of the table and 
  ** remember the column indices.
  **

          if( j==pTab->iPKey ){
            keyColumn = i;
          }
          break;
        }
      }
      if( j>=pTab->nCol ){
        sqliteErrorMsg(pParse, "table %S has no column named %s",
            pTabList, 0, pColumn->a[i].zName);
        pParse->nErr++;
        goto insert_cleanup;
      }
    }
  }

  /* If there is no IDLIST term but the table has an integer primary

**    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 1.129 2003/03/31 02:12:47 drh Exp $
*/
#include "sqliteInt.h"


/*
** Allocate a new Select structure and return a pointer to that
** structure.

    if( pB==0 ){ pB = &dummy; zSp1 = 0; }
    if( pC==0 ){ pC = &dummy; zSp2 = 0; }
    sqliteSetNString(&pParse->zErrMsg, "unknown or unsupported join type: ", 0,
       pA->z, pA->n, zSp1, 1, pB->z, pB->n, zSp2, 1, pC->z, pC->n, 0);
    pParse->nErr++;
    jointype = JT_INNER;
  }else if( jointype & JT_RIGHT ){
    sqliteErrorMsg(pParse, 
      "RIGHT and FULL OUTER JOINs are not currently supported");

    jointype = JT_INNER;
  }
  return jointype;
}

/*
** Return the index of a column in a table.  Return -1 if the column

    /* When the NATURAL keyword is present, add WHERE clause terms for
    ** every column that the two tables have in common.
    */
    if( pTerm->jointype & JT_NATURAL ){
      Table *pTab;
      if( pTerm->pOn || pTerm->pUsing ){
        sqliteErrorMsg(pParse, "a NATURAL join may not have "
           "an ON or USING clause", 0);

        return 1;
      }
      pTab = pTerm->pTab;
      for(j=0; j<pTab->nCol; j++){
        if( columnIndex(pOther->pTab, pTab->aCol[j].zName)>=0 ){
          addWhereTerm(pTab->aCol[j].zName, pTab, pOther->pTab, &p->pWhere);
        }
      }
    }

    /* Disallow both ON and USING clauses in the same join
    */
    if( pTerm->pOn && pTerm->pUsing ){
      sqliteErrorMsg(pParse, "cannot have both ON and USING "
        "clauses in the same join");

      return 1;
    }

    /* Add the ON clause to the end of the WHERE clause, connected by
    ** and AND operator.
    */
    if( pTerm->pOn ){

      IdList *pList;
      int j;
      assert( i<pSrc->nSrc-1 );
      pList = pTerm->pUsing;
      for(j=0; j<pList->nId; j++){
        if( columnIndex(pTerm->pTab, pList->a[j].zName)<0 ||
            columnIndex(pOther->pTab, pList->a[j].zName)<0 ){
          sqliteErrorMsg(pParse, "cannot join using column %s - column "
            "not present in both tables", pList->a[j].zName);

          return 1;
        }
        addWhereTerm(pList->a[j].zName, pTerm->pTab, pOther->pTab, &p->pWhere);
      }
    }
  }
  return 0;

      pTab->isTransient = 1;
    }else{
      /* An ordinary table or view name in the FROM clause */
      pTabList->a[i].pTab = pTab = 
        sqliteFindTable(pParse->db, pTabList->a[i].zName,
                                    pTabList->a[i].zDatabase);
      if( pTab==0 ){
        sqliteErrorMsg(pParse, "no such table: %S", pTabList, i);


        return 1;
      }
      if( pTab->pSelect ){
        if( sqliteViewGetColumnNames(pParse, pTab) ){
          return 1;
        }
        sqliteSelectDelete(pTabList->a[i].pSelect);

              pExpr->span = pExpr->token;
            }
            pNew = sqliteExprListAppend(pNew, pExpr, 0);
          }
        }
        if( !tableSeen ){
          if( pName ){
            sqliteErrorMsg(pParse, "no such table: %T", pName);

          }else{
            sqliteErrorMsg(pParse, "no tables specified");
          }
          rc = 1;
        }
      }
    }
    sqliteExprListDelete(pEList);
    p->pEList = pNew;

  pEList = pSelect->pEList;
  for(i=0; i<pOrderBy->nExpr; i++){
    Expr *pE = pOrderBy->a[i].pExpr;
    int iCol = -1;
    if( pOrderBy->a[i].done ) continue;
    if( sqliteExprIsInteger(pE, &iCol) ){
      if( iCol<=0 || iCol>pEList->nExpr ){
        sqliteErrorMsg(pParse,
          "ORDER BY position %d should be between 1 and %d",
          iCol, pEList->nExpr);


        nErr++;
        break;
      }
      if( !mustComplete ) continue;
      iCol--;
    }
    for(j=0; iCol<0 && j<pEList->nExpr; j++){

    if( iCol>=0 ){
      pE->op = TK_COLUMN;
      pE->iColumn = iCol;
      pE->iTable = iTable;
      pOrderBy->a[i].done = 1;
    }
    if( iCol<0 && mustComplete ){


      sqliteErrorMsg(pParse,
        "ORDER BY term number %d does not match any result column", i+1);

      nErr++;
      break;
    }
  }
  return nErr;  
}

  /* Make sure there is no ORDER BY clause on prior SELECTs.  Only the 
  ** last SELECT in the series may have an ORDER BY.
  */
  if( p==0 || p->pPrior==0 ) return 1;
  pPrior = p->pPrior;
  if( pPrior->pOrderBy ){
    sqliteErrorMsg(pParse,"ORDER BY clause should come after %s not before",
      selectOpName(p->op));

    return 1;
  }

  /* Make sure we have a valid query engine.  If not, create a new one.
  */
  v = sqliteGetVdbe(pParse);
  if( v==0 ) return 1;

        generateSortTail(p, v, p->pEList->nExpr, eDest, iParm);
      }
      break;
    }
  }
  assert( p->pEList && pPrior->pEList );
  if( p->pEList->nExpr!=pPrior->pEList->nExpr ){
    sqliteErrorMsg(pParse, "SELECTs to the left and right of %s"
      " do not have the same number of result columns", selectOpName(p->op));

    return 1;
  }

  /* Issue a null callback if that is what the user wants.
  */
  if( eDest==SRT_Callback &&
    (pParse->useCallback==0 || (pParse->db->flags & SQLITE_NullCallback)!=0)

  pEList = p->pEList;
  if( pEList==0 ) goto select_end;

  /* If writing to memory or generating a set
  ** only a single column may be output.
  */
  if( (eDest==SRT_Mem || eDest==SRT_Set) && pEList->nExpr>1 ){
    sqliteErrorMsg(pParse, "only a single result allowed for "
       "a SELECT that is part of an expression");

    goto select_end;
  }

  /* ORDER BY is ignored for some destinations.
  */
  switch( eDest ){
    case SRT_Union:

    if( sqliteExprCheck(pParse, pWhere, 0, 0) ){
      goto select_end;
    }
    sqliteOracle8JoinFixup(base, pTabList, pWhere);
  }
  if( pHaving ){
    if( pGroupBy==0 ){
      sqliteErrorMsg(pParse, "a GROUP BY clause is required before HAVING");


      goto select_end;
    }
    if( sqliteExprResolveIds(pParse, base, pTabList, pEList, pHaving) ){
      goto select_end;
    }
    if( sqliteExprCheck(pParse, pHaving, 1, &isAgg) ){
      goto select_end;

        goto select_end;
      }
      if( sqliteExprCheck(pParse, pE, isAgg, 0) ){
        goto select_end;
      }
      if( sqliteExprIsConstant(pE) ){
        if( sqliteExprIsInteger(pE, &iCol)==0 ){
          sqliteErrorMsg(pParse,
             "ORDER BY terms must not be non-integer constants");

          goto select_end;
        }else if( iCol<=0 || iCol>pEList->nExpr ){
          sqliteErrorMsg(pParse, 
             "ORDER BY column number %d out of range - should be "
             "between 1 and %d", iCol, pEList->nExpr);


          goto select_end;
        }
      }
    }
  }
  if( pGroupBy ){
    for(i=0; i<pGroupBy->nExpr; i++){

        goto select_end;
      }
      if( sqliteExprCheck(pParse, pE, isAgg, 0) ){
        goto select_end;
      }
      if( sqliteExprIsConstant(pE) ){
        if( sqliteExprIsInteger(pE, &iCol)==0 ){
          sqliteErrorMsg(pParse,
            "GROUP BY terms must not be non-integer constants");

          goto select_end;
        }else if( iCol<=0 || iCol>pEList->nExpr ){
          sqliteErrorMsg(pParse,
             "GROUP BY column number %d out of range - should be "
             "between 1 and %d", iCol, pEList->nExpr);


          goto select_end;
        }
      }
    }
  }

  /* Check for the special case of a min() or max() function by itself

/*
** 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 1.168 2003/03/31 02:12:48 drh Exp $
*/
#include "config.h"
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"

  char *sqliteStrDup(const char*);
  char *sqliteStrNDup(const char*, int);
# define sqliteCheckMemory(a,b)
#endif
char *sqliteMPrintf(const char *,...);
void sqliteSetString(char **, const char *, ...);
void sqliteSetNString(char **, ...);
void sqliteErrorMsg(Parse*, const char*, ...);
void sqliteDequote(char*);
int sqliteKeywordCode(const char*, int);
int sqliteRunParser(Parse*, const char*, char **);
void sqliteExec(Parse*);
Expr *sqliteExpr(int, Expr*, Expr*, Token*);
void sqliteExprSpan(Expr*,Token*,Token*);
Expr *sqliteExprFunction(ExprList*, Token*);

  if( sqlite_malloc_failed ) goto trigger_cleanup;
  assert( pTableName->nSrc==1 );
  tab = sqliteSrcListLookup(pParse, pTableName);
  if( !tab ){
    goto trigger_cleanup;
  }
  if( tab->iDb>=2 ){
    sqliteErrorMsg(pParse, "triggers may not be added to auxiliary "
       "database %s", db->aDb[tab->iDb].zName);

    goto trigger_cleanup;
  }

  zName = sqliteStrNDup(pName->z, pName->n);
  if( sqliteHashFind(&(db->aDb[tab->iDb].trigHash), zName,pName->n+1) ){

    sqliteErrorMsg(pParse, "trigger %T already exists", pName);

    goto trigger_cleanup;
  }
  if( sqliteStrNICmp(tab->zName, "sqlite_", 7)==0 ){
    sqliteErrorMsg(pParse, "cannot create trigger on system table");
    pParse->nErr++;
    goto trigger_cleanup;
  }
  if( tab->pSelect && tr_tm != TK_INSTEAD ){
    sqliteErrorMsg(pParse, "cannot create %s trigger on view: %S", 
        (tr_tm == TK_BEFORE)?"BEFORE":"AFTER", pTableName, 0);

    goto trigger_cleanup;
  }
  if( !tab->pSelect && tr_tm == TK_INSTEAD ){
    sqliteErrorMsg(pParse, "cannot create INSTEAD OF"
        " trigger on table: %S", pTableName, 0);
    goto trigger_cleanup;
  }
#ifndef SQLITE_OMIT_AUTHORIZATION
  {
    int code = SQLITE_CREATE_TRIGGER;
    if( tab->iDb==1 ) code = SQLITE_CREATE_TEMP_TRIGGER;
    if( sqliteAuthCheck(pParse, code, zName, tab->zName) ){

  for(i=0; i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
    if( zDb && sqliteStrICmp(db->aDb[j].zName, zDb) ) continue;
    pTrigger = sqliteHashFind(&(db->aDb[j].trigHash), zName, nName+1);
    if( pTrigger ) break;
  }
  if( !pTrigger ){
    sqliteErrorMsg(pParse, "no such trigger: %S", pName, 0);
    goto drop_trigger_cleanup;
  }
  assert( pTrigger->iDb>=0 && pTrigger->iDb<db->nDb );
  if( pTrigger->iDb>=2 ){
    sqliteErrorMsg(pParse, "triggers may not be removed from "
       "auxiliary database %s", db->aDb[pTrigger->iDb].zName);

    goto drop_trigger_cleanup;
  }
  pTable = sqliteFindTable(db, pTrigger->table, db->aDb[pTrigger->iDb].zName);
  assert(pTable);
  assert( pTable->iDb==pTrigger->iDb );
#ifndef SQLITE_OMIT_AUTHORIZATION
  {

      for(jj=0; jj<pTab->nCol; jj++){
        if( sqliteStrICmp(pTab->aCol[jj].zName, pChanges->a[ii].zName)==0 ){
          aXRef[jj] = ii;
          break;
        }
      }
      if( jj>=pTab->nCol ){

        sqliteErrorMsg(pParse, "no such column: %s", pChanges->a[ii].zName);

        goto trigger_cleanup;
      }
    }

    sqliteVdbeAddOp(v, OP_Integer, 13, 0);

    for(ii = 0; ii<pTab->nCol; ii++){

**    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 UPDATE statements.
**
** $Id: update.c,v 1.58 2003/03/31 02:12:48 drh Exp $
*/
#include "sqliteInt.h"

/*
** Process an UPDATE statement.
*/
void sqliteUpdate(

          pRecnoExpr = pChanges->a[i].pExpr;
        }
        aXRef[j] = i;
        break;
      }
    }
    if( j>=pTab->nCol ){

      sqliteErrorMsg(pParse, "no such column: %s", pChanges->a[i].zName);

      goto update_cleanup;
    }
#ifndef SQLITE_OMIT_AUTHORIZATION
    {
      int rc;
      rc = sqliteAuthCheck(pParse, SQLITE_UPDATE, pTab->zName,
                           pTab->aCol[j].zName);

**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.59 2003/03/31 02:12:48 drh Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>
#include <ctype.h>

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

#ifdef MEMORY_DEBUG
#if MEMORY_DEBUG>1
  fprintf(stderr,"string at 0x%x is %s\n", (int)*pz, *pz);
#endif
#endif
  va_end(ap);
}

/*
** Add an error message to pParse->zErrMsg and increment pParse->nErr.
** The following formatting characters are allowed:
**
**      %s      Insert a string
**      %z      A string that should be freed after use
**      %d      Insert an integer
**      %T      Insert a token
**      %S      Insert the first element of a SrcList
*/
void sqliteErrorMsg(Parse *pParse, const char *zFormat, ...){
  va_list ap;
  int nByte;
  int i, j;
  char *z;
  static char zNull[] = "NULL";

  pParse->nErr++;
  nByte = 1 + strlen(zFormat);
  va_start(ap, zFormat);
  for(i=0; zFormat[i]; i++){
    if( zFormat[i]!='%' && zFormat[i+1] ) continue;
    i++;
    switch( zFormat[i] ){
      case 'd': {
        (void)va_arg(ap, int);
        nByte += 20;
        break;
      }
      case 'z':
      case 's': {
        char *z2 = va_arg(ap, char*);
        if( z2==0 ) z2 = zNull;
        nByte += strlen(z2);
        break;
      }
      case 'T': {
        Token *p = va_arg(ap, Token*);
        nByte += p->n;
        break;
      }
      case 'S': {
        SrcList *p = va_arg(ap, SrcList*);
        int k = va_arg(ap, int);
        assert( p->nSrc>k && k>=0 );
        nByte += strlen(p->a[k].zName);
        if( p->a[k].zDatabase && p->a[k].zDatabase[0] ){
          nByte += strlen(p->a[k].zDatabase)+1;
        }
        break;
      }
      default: {
        nByte++;
        break;
      }
    }
  }
  va_end(ap);
  z = sqliteMalloc( nByte );
  if( z==0 ) return;
  sqliteFree(pParse->zErrMsg);
  pParse->zErrMsg = z;
  va_start(ap, zFormat);
  for(i=j=0; zFormat[i]; i++){
    if( zFormat[i]!='%' ) continue;
    if( i>j ){
      memcpy(z, &zFormat[j], i-j);
      z += i-j;
    }
    j = i+2;
    i++;
    switch( zFormat[i] ){
      case 'd': {
        int x = va_arg(ap, int);
        sprintf(z, "%d", x);
        z += strlen(z);
        break;
      }
      case 'z':
      case 's': {
        int len;
        char *z2 = va_arg(ap, char*);
        if( z2==0 ) z2 = zNull;
        len = strlen(z2);
        memcpy(z, z2, len);
        z += len;
        if( zFormat[i]=='z' && z2!=zNull ){
          sqliteFree(z2);
        }
        break;
      }
      case 'T': {
        Token *p = va_arg(ap, Token*);
        memcpy(z, p->z, p->n);
        z += p->n;
        break;
      }
      case 'S': {
        int len;
        SrcList *p = va_arg(ap, SrcList*);
        int k = va_arg(ap, int);
        assert( p->nSrc>k && k>=0 );
        if( p->a[k].zDatabase && p->a[k].zDatabase[0] ){
          len = strlen(p->a[k].zDatabase);
          memcpy(z, p->a[k].zDatabase, len);
          z += len;
          *(z++) = '.';
        }
        len = strlen(p->a[k].zName);
        memcpy(z, p->a[k].zName, len);
        z += len;
        break;
      }
      default: {
        *(z++) = zFormat[i];
        break;
      }
    }
  }
  va_end(ap);
  if( i>j ){
    memcpy(z, &zFormat[j], i-j);
    z += i-j;
  }
  assert( (z - pParse->zErrMsg) < nByte );
  *z = 0;
}

/*
** Convert an SQL-style quoted string into a normal string by removing
** the quote characters.  The conversion is done in-place.  If the
** input does not begin with a quote character, then this routine
** is a no-op.
**