**    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 contains code used to implement the PRAGMA command.
**
** $Id: pragma.c,v 1.16 2004/02/21 13:31:10 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** Interpret the given string as a boolean value.
*/
static int getBoolean(char *z){
  static char *azTrue[] = { "yes", "on", "true" };
  int i;
  if( z[0]==0 ) return 0;
  if( isdigit(z[0]) || (z[0]=='-' && isdigit(z[1])) ){
    return atoi(z);
  }
  for(i=0; i<sizeof(azTrue)/sizeof(azTrue[0]); i++){
................................................................................
    return 1;
  }else if( sqliteStrICmp(z, "memory")==0 ){
    return 2;
  }else{
    return 0;
  }
}









































/*
** Process a pragma statement.  
**
** Pragmas are of this form:
**
**      PRAGMA id = value
................................................................................
      if( db->safety_level==1 ) size = -size;
      db->cache_size = size;
      sqliteBtreeSetCacheSize(db->aDb[0].pBt, db->cache_size);
      sqliteBtreeSetSafetyLevel(db->aDb[0].pBt, db->safety_level);
    }
  }else


  if( sqliteStrICmp(zLeft, "trigger_overhead_test")==0 ){
    if( getBoolean(zRight) ){
      always_code_trigger_setup = 1;
    }else{
      always_code_trigger_setup = 0;
    }
  }else


  if( sqliteStrICmp(zLeft, "vdbe_trace")==0 ){
    if( getBoolean(zRight) ){
      db->flags |= SQLITE_VdbeTrace;
    }else{
      db->flags &= ~SQLITE_VdbeTrace;
    }
  }else

  if( sqliteStrICmp(zLeft, "full_column_names")==0 ){
    if( getBoolean(zRight) ){
      db->flags |= SQLITE_FullColNames;
    }else{
      db->flags &= ~SQLITE_FullColNames;
    }
  }else

  if( sqliteStrICmp(zLeft, "short_column_names")==0 ){
    if( getBoolean(zRight) ){
      db->flags |= SQLITE_ShortColNames;
    }else{
      db->flags &= ~SQLITE_ShortColNames;
    }
  }else

  if( sqliteStrICmp(zLeft, "show_datatypes")==0 ){
    if( getBoolean(zRight) ){
      db->flags |= SQLITE_ReportTypes;
    }else{
      db->flags &= ~SQLITE_ReportTypes;
    }
  }else

  if( sqliteStrICmp(zLeft, "count_changes")==0 ){
    if( getBoolean(zRight) ){
      db->flags |= SQLITE_CountRows;
    }else{
      db->flags &= ~SQLITE_CountRows;
    }
  }else

  if( sqliteStrICmp(zLeft, "empty_result_callbacks")==0 ){
    if( getBoolean(zRight) ){
      db->flags |= SQLITE_NullCallback;
    }else{
      db->flags &= ~SQLITE_NullCallback;
    }
  }else

  if( sqliteStrICmp(zLeft, "table_info")==0 ){
    Table *pTab;
    pTab = sqliteFindTable(db, zRight, 0);
    if( pTab ){
      static VdbeOpList tableInfoPreface[] = {

**    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 contains code used to implement the PRAGMA command.
**
** $Id: pragma.c,v 1.17 2004/02/21 14:00:29 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** Interpret the given string as a boolean value.
*/
static int getBoolean(const char *z){
  static char *azTrue[] = { "yes", "on", "true" };
  int i;
  if( z[0]==0 ) return 0;
  if( isdigit(z[0]) || (z[0]=='-' && isdigit(z[1])) ){
    return atoi(z);
  }
  for(i=0; i<sizeof(azTrue)/sizeof(azTrue[0]); i++){
................................................................................
    return 1;
  }else if( sqliteStrICmp(z, "memory")==0 ){
    return 2;
  }else{
    return 0;
  }
}

/*
** Check to see if zRight and zLeft refer to a pragma that queries
** or changes one of the flags in db->flags.  Return 1 if so and 0 if not.
** Also, implement the pragma.
*/
static int flagPragma(Parse *pParse, const char *zLeft, const char *zRight){
  static const struct {
    const char *zName;  /* Name of the pragma */
    int mask;           /* Mask for the db->flags value */
  } aPragma[] = {
    { "vdbe_trace",               SQLITE_VdbeTrace     },
    { "full_column_names",        SQLITE_FullColNames  },
    { "short_column_names",       SQLITE_ShortColNames },
    { "show_datatypes",           SQLITE_ReportTypes   },
    { "count_changes",            SQLITE_CountRows     },
    { "empty_result_callbacks",   SQLITE_NullCallback  },
  };
  int i;
  for(i=0; i<sizeof(aPragma)/sizeof(aPragma[0]); i++){
    if( sqliteStrICmp(zLeft, aPragma[i].zName)==0 ){
      sqlite *db = pParse->db;
      Vdbe *v;
      if( strcmp(zLeft,zRight)==0 && (v = sqliteGetVdbe(pParse))!=0 ){
        sqliteVdbeAddOp(v, OP_ColumnName, 0, 1);
        sqliteVdbeChangeP3(v, -1, aPragma[i].zName, P3_STATIC);
        sqliteVdbeAddOp(v, OP_ColumnName, 1, 0);
        sqliteVdbeChangeP3(v, -1, "boolean", P3_STATIC);
        sqliteVdbeAddOp(v, OP_Integer, (db->flags & aPragma[i].mask)!=0, 0);
        sqliteVdbeAddOp(v, OP_Callback, 1, 0);
      }else if( getBoolean(zRight) ){
        db->flags |= aPragma[i].mask;
      }else{
        db->flags &= ~aPragma[i].mask;
      }
      return 1;
    }
  }
  return 0;
}

/*
** Process a pragma statement.  
**
** Pragmas are of this form:
**
**      PRAGMA id = value
................................................................................
      if( db->safety_level==1 ) size = -size;
      db->cache_size = size;
      sqliteBtreeSetCacheSize(db->aDb[0].pBt, db->cache_size);
      sqliteBtreeSetSafetyLevel(db->aDb[0].pBt, db->safety_level);
    }
  }else

#ifndef NDEBUG
  if( sqliteStrICmp(zLeft, "trigger_overhead_test")==0 ){
    if( getBoolean(zRight) ){
      always_code_trigger_setup = 1;
    }else{
      always_code_trigger_setup = 0;
    }
  }else
#endif


  if( flagPragma(pParse, zLeft, zRight) ){
    /* The flagPragma() call also generates any necessary code */











































  }else

  if( sqliteStrICmp(zLeft, "table_info")==0 ){
    Table *pTab;
    pTab = sqliteFindTable(db, zRight, 0);
    if( pTab ){
      static VdbeOpList tableInfoPreface[] = {