/* vim: ts=8:sw=4:expandtab
 *
 * $Id$
 *
 * Copyright (c) 1994-2010  Tim Bunce  Ireland
 *
 * See COPYRIGHT section in DBI.pm for usage and distribution rights.
 */

/* DBI Interface Definitions for DBD Modules */

#ifndef DBIXS_VERSION                           /* prevent multiple inclusion */

#ifndef DBIS
#define DBIS    dbis    /* default name for dbistate_t variable */
#endif

/* Here for backwards compat. PERL_POLLUTE was removed in perl 5.13.3 */
#define PERL_POLLUTE

/* first pull in the standard Perl header files for extensions  */
#include <EXTERN.h>
#include <perl.h>
#include <XSUB.h>

#ifdef debug            /* causes problems with DBIS->debug     */
#undef debug
#endif

#ifdef std             /* causes problems with STLport <tscheresky@micron.com> */
#undef std
#endif

/* define DBIXS_REVISION */
#include "dbixs_rev.h"

/* Perl backwards compatibility definitions */
#include "dbipport.h"

/* DBI SQL_* type definitions */
#include "dbi_sql.h"


#define DBIXS_VERSION 93 /* superceeded by DBIXS_REVISION */

#ifdef NEED_DBIXS_VERSION
#if NEED_DBIXS_VERSION > DBIXS_VERSION
error You_need_to_upgrade_your_DBI_module_before_building_this_driver
#endif
#else
#define NEED_DBIXS_VERSION DBIXS_VERSION
#endif


#define DBI_LOCK
#define DBI_UNLOCK

#ifndef DBI_NO_THREADS
#ifdef USE_ITHREADS
#define DBI_USE_THREADS
#endif /* USE_ITHREADS */
#endif /* DBI_NO_THREADS */


/* forward struct declarations                                          */

typedef struct dbistate_st dbistate_t;
/* implementor needs to define actual struct { dbih_??c_t com; ... }*/
typedef struct imp_drh_st imp_drh_t;    /* driver                       */
typedef struct imp_dbh_st imp_dbh_t;    /* database                     */
typedef struct imp_sth_st imp_sth_t;    /* statement                    */
typedef struct imp_fdh_st imp_fdh_t;    /* field descriptor             */
typedef struct imp_xxh_st imp_xxh_t;    /* any (defined below)          */
#define DBI_imp_data_ imp_xxh_t         /* friendly for take_imp_data   */



/* --- DBI Handle Common Data Structure (all handles have one) ---      */

/* Handle types. Code currently assumes child = parent + 1.             */
#define DBIt_DR         1
#define DBIt_DB         2
#define DBIt_ST         3
#define DBIt_FD         4

/* component structures */

typedef struct dbih_com_std_st {
    U32  flags;
    int  call_depth;    /* used by DBI to track nested calls (int)      */
    U16  type;          /* DBIt_DR, DBIt_DB, DBIt_ST                    */
    HV   *my_h;         /* copy of outer handle HV (not refcounted)     */
    SV   *parent_h;     /* parent inner handle (ref to hv) (r.c.inc)    */
    imp_xxh_t *parent_com;      /* parent com struct shortcut           */
    PerlInterpreter * thr_user;  /* thread that owns the handle         */

    HV   *imp_stash;    /* who is the implementor for this handle       */
    SV   *imp_data;     /* optional implementors data (for perl imp's)  */

    I32  kids;          /* count of db's for dr's, st's for db's etc    */
    I32  active_kids;   /* kids which are currently DBIc_ACTIVE         */
    U32  pid;           /* pid of process that created handle */
    dbistate_t *dbistate;
} dbih_com_std_t;

typedef struct dbih_com_attr_st {
    /* These are copies of the Hash values (ref.cnt.inc'd)      */
    /* Many of the hash values are themselves references        */
    SV *TraceLevel;
    SV *State;          /* Standard SQLSTATE, 5 char string     */
    SV *Err;            /* Native engine error code             */
    SV *Errstr;         /* Native engine error message          */
    UV ErrCount;
    U32  LongReadLen;   /* auto read length for long/blob types */
    SV *FetchHashKeyName;       /* for fetchrow_hashref         */
    /* (NEW FIELDS?... DON'T FORGET TO UPDATE dbih_clearcom()!) */
} dbih_com_attr_t;


struct dbih_com_st {    /* complete core structure (typedef'd above)    */
    dbih_com_std_t      std;
    dbih_com_attr_t     attr;
};

/* This 'implementors' type the DBI defines by default as a way to      */
/* refer to the imp_??h data of a handle without considering its type.  */
struct imp_xxh_st { struct dbih_com_st com; };

/* Define handle-type specific structures for implementors to include   */
/* at the start of their private structures.                            */

typedef struct {                /* -- DRIVER --                         */
    dbih_com_std_t      std;
    dbih_com_attr_t     attr;
    HV          *_old_cached_kids; /* not used, here for binary compat */
} dbih_drc_t;

typedef struct {                /* -- DATABASE --                       */
    dbih_com_std_t      std;    /* \__ standard structure               */
    dbih_com_attr_t     attr;   /* /   plus... (nothing else right now) */
    HV          *_old_cached_kids; /* not used, here for binary compat */
} dbih_dbc_t;

typedef struct {                /* -- STATEMENT --                      */
    dbih_com_std_t      std;    /* \__ standard structure               */
    dbih_com_attr_t     attr;   /* /   plus ...                         */

    int         num_params;     /* number of placeholders               */
    int         num_fields;     /* NUM_OF_FIELDS, must be set           */
    AV          *fields_svav;   /* special row buffer (inc bind_cols)   */
    IV          row_count;      /* incremented by get_fbav()            */

    AV          *fields_fdav;   /* not used yet, may change */

    I32  spare1;
    void *spare2;
} dbih_stc_t;


/* XXX THIS STRUCTURE SHOULD NOT BE USED */
typedef struct {                /* -- FIELD DESCRIPTOR --               */
    dbih_com_std_t      std;    /* standard structure (not fully setup) */

    /* core attributes (from DescribeCol in ODBC)               */
    char *col_name;             /* see dbih_make_fdsv           */
    I16   col_name_len;
    I16   col_sql_type;
    I16   col_precision;
    I16   col_scale;
    I16   col_nullable;

    /* additional attributes (from ColAttributes in ODBC)       */
    I32   col_length;
    I32   col_disp_size;

    I32  spare1;
    void *spare2;
} dbih_fdc_t;


#define _imp2com(p,f)           ((p)->com.f) /* private */

#define DBIc_FLAGS(imp)         _imp2com(imp, std.flags)
#define DBIc_TYPE(imp)          _imp2com(imp, std.type)
#define DBIc_CALL_DEPTH(imp)    _imp2com(imp, std.call_depth)
#define DBIc_MY_H(imp)          _imp2com(imp, std.my_h)
#define DBIc_PARENT_H(imp)      _imp2com(imp, std.parent_h)
#define DBIc_PARENT_COM(imp)    _imp2com(imp, std.parent_com)
#define DBIc_THR_COND(imp)      _imp2com(imp, std.thr_cond)
#define DBIc_THR_USER(imp)      _imp2com(imp, std.thr_user)
#define DBIc_THR_USER_NONE      (0xFFFF)
#define DBIc_IMP_STASH(imp)     _imp2com(imp, std.imp_stash)
#define DBIc_IMP_DATA(imp)      _imp2com(imp, std.imp_data)
#define DBIc_DBISTATE(imp)      _imp2com(imp, std.dbistate)
#define DBIc_LOGPIO(imp)        DBIc_DBISTATE(imp)->logfp
#define DBIc_KIDS(imp)          _imp2com(imp, std.kids)
#define DBIc_ACTIVE_KIDS(imp)   _imp2com(imp, std.active_kids)
#define DBIc_LAST_METHOD(imp)   _imp2com(imp, std.last_method)

/*  d = DBD flags,  l = DBD level (needs to be shifted down)
 *  D - DBI flags,  r = reserved,  L = DBI trace level
 *  Trace level bit allocation: 0xddlDDDrL   */
#define DBIc_TRACE_LEVEL_MASK   0x0000000F
#define DBIc_TRACE_FLAGS_MASK   0xFF0FFF00  /* includes DBD flag bits for DBIc_TRACE */
#define DBIc_TRACE_SETTINGS(imp) (DBIc_DBISTATE(imp)->debug)
#define DBIc_TRACE_LEVEL(imp)   (DBIc_TRACE_SETTINGS(imp) & DBIc_TRACE_LEVEL_MASK)
#define DBIc_TRACE_FLAGS(imp)   (DBIc_TRACE_SETTINGS(imp) & DBIc_TRACE_FLAGS_MASK)
/* DBI defined trace flags */
#define DBIf_TRACE_SQL          0x00000100
#define DBIf_TRACE_CON          0x00000200
#define DBIf_TRACE_ENC          0x00000400
#define DBIf_TRACE_DBD          0x00000800
#define DBIf_TRACE_TXN          0x00001000

#define DBDc_TRACE_LEVEL_MASK   0x00F00000
#define DBDc_TRACE_LEVEL_SHIFT  20
#define DBDc_TRACE_LEVEL(imp)         ( (DBIc_TRACE_SETTINGS(imp) & DBDc_TRACE_LEVEL_MASK) >> DBDc_TRACE_LEVEL_SHIFT )
#define DBDc_TRACE_LEVEL_set(imp, l)  ( DBIc_TRACE_SETTINGS(imp) |= (((l) << DBDc_TRACE_LEVEL_SHIFT) & DBDc_TRACE_LEVEL_MASK ))

/* DBIc_TRACE_MATCHES(this, crnt): true if this 'matches' (is within) crnt
   DBIc_TRACE_MATCHES(foo, DBIc_TRACE_SETTINGS(imp))
*/
#define DBIc_TRACE_MATCHES(this, crnt)  \
        (  ((crnt & DBIc_TRACE_LEVEL_MASK) >= (this & DBIc_TRACE_LEVEL_MASK)) \
        || ((crnt & DBIc_TRACE_FLAGS_MASK)  & (this & DBIc_TRACE_FLAGS_MASK)) )

/* DBIc_TRACE(imp, flags, flag_level, fallback_level)
   True if flags match the handle trace flags & handle trace level >= flag_level,
   OR if handle trace_level > fallback_level (typically > flag_level).
   This is the main trace testing macro to be used by drivers.
   (Drivers should define their own DBDf_TRACE_* macros for the top 8 bits: 0xFF000000)
   DBIc_TRACE(imp,              0, 0, 4) = if trace level >= 4
   DBIc_TRACE(imp, DBDf_TRACE_FOO, 2, 4) = if tracing DBDf_FOO & level>=2 or level>=4
   DBIc_TRACE(imp, DBDf_TRACE_FOO, 2, 0) = as above but never trace just due to level
   e.g.
    if (DBIc_TRACE(imp_xxh, DBIf_TRACE_SQL|DBIf_TRACE_xxx, 2, 0)) {
        PerlIO_printf(DBIc_LOGPIO(imp_sth), "\tThe %s wibbled the %s\n", ...);
    }
*/
#define DBIc_TRACE(imp, flags, flaglevel, level)        \
        (  (flags && (DBIc_TRACE_FLAGS(imp) & flags) && (DBIc_TRACE_LEVEL(imp) >= flaglevel)) \
        || (level && DBIc_TRACE_LEVEL(imp) >= level) )

#define DBIc_DEBUG(imp)         (_imp2com(imp, attr.TraceLevel)) /* deprecated */
#define DBIc_DEBUGIV(imp)       SvIV(DBIc_DEBUG(imp))            /* deprecated */
#define DBIc_STATE(imp)         SvRV(_imp2com(imp, attr.State))
#define DBIc_ERR(imp)           SvRV(_imp2com(imp, attr.Err))
#define DBIc_ERRSTR(imp)        SvRV(_imp2com(imp, attr.Errstr))
#define DBIc_ErrCount(imp)      _imp2com(imp, attr.ErrCount)
#define DBIc_LongReadLen(imp)   _imp2com(imp, attr.LongReadLen)
#define DBIc_LongReadLen_init   80      /* may change */
#define DBIc_FetchHashKeyName(imp) (_imp2com(imp, attr.FetchHashKeyName))

/* handle sub-type specific fields                                              */
/*      dbh & drh       */
#define DBIc_CACHED_KIDS(imp)   Nullhv /* no longer used, here for src compat */
/*      sth     */
#define DBIc_NUM_FIELDS(imp)    _imp2com(imp, num_fields)
#define DBIc_NUM_PARAMS(imp)    _imp2com(imp, num_params)
#define DBIc_NUM_PARAMS_AT_EXECUTE      -9 /* see Driver.xst */
#define DBIc_ROW_COUNT(imp)     _imp2com(imp, row_count)
#define DBIc_FIELDS_AV(imp)     _imp2com(imp, fields_svav)
#define DBIc_FDESC_AV(imp)      _imp2com(imp, fields_fdav)
#define DBIc_FDESC(imp, i)      ((imp_fdh_t*)(void*)SvPVX(AvARRAY(DBIc_FDESC_AV(imp))[i]))

/* XXX --- DO NOT CHANGE THESE VALUES AS THEY ARE COMPILED INTO DRIVERS --- XXX */
#define DBIcf_COMSET      0x000001      /* needs to be clear'd before free'd    */
#define DBIcf_IMPSET      0x000002      /* has implementor data to be clear'd   */
#define DBIcf_ACTIVE      0x000004      /* needs finish/disconnect before clear */
#define DBIcf_IADESTROY   0x000008      /* do DBIc_ACTIVE_off before DESTROY    */
#define DBIcf_WARN        0x000010      /* warn about poor practice etc         */
#define DBIcf_COMPAT      0x000020      /* compat/emulation mode (eg oraperl)   */
#define DBIcf_ChopBlanks  0x000040      /* rtrim spaces from fetch char columns */
#define DBIcf_RaiseError  0x000080      /* throw exception (croak) on error     */
#define DBIcf_PrintError  0x000100      /* warn() on error                      */
#define DBIcf_AutoCommit  0x000200      /* dbh only. used by drivers            */
#define DBIcf_LongTruncOk 0x000400      /* truncation to LongReadLen is okay    */
#define DBIcf_MultiThread 0x000800      /* allow multiple threads to enter      */
#define DBIcf_HandleSetErr 0x001000     /* has coderef HandleSetErr attribute   */
#define DBIcf_ShowErrorStatement  0x002000   /* include Statement in error      */
#define DBIcf_BegunWork   0x004000      /* between begin_work & commit/rollback */
#define DBIcf_HandleError 0x008000      /* has coderef in HandleError attribute */
#define DBIcf_Profile     0x010000      /* profile activity on this handle      */
#define DBIcf_TaintIn     0x020000      /* check inputs for taintedness */
#define DBIcf_TaintOut    0x040000      /* taint outgoing data */
#define DBIcf_Executed    0x080000      /* do/execute called since commit/rollb */
#define DBIcf_PrintWarn   0x100000      /* warn() on warning (err="0")          */
#define DBIcf_Callbacks   0x200000      /* has Callbacks attribute hash         */
#define DBIcf_AIADESTROY  0x400000      /* auto DBIcf_IADESTROY if pid changes  */
/* NOTE: new flags may require clone() to be updated */

#define DBIcf_INHERITMASK               /* what NOT to pass on to children */   \
  (U32)( DBIcf_COMSET | DBIcf_IMPSET | DBIcf_ACTIVE | DBIcf_IADESTROY \
  | DBIcf_AutoCommit | DBIcf_BegunWork | DBIcf_Executed | DBIcf_Callbacks )

/* general purpose bit setting and testing macros                       */
#define DBIbf_is( bitset,flag)          ((bitset) &   (flag))
#define DBIbf_has(bitset,flag)          DBIbf_is(bitset, flag) /* alias for _is */
#define DBIbf_on( bitset,flag)          ((bitset) |=  (flag))
#define DBIbf_off(bitset,flag)          ((bitset) &= ~(flag))
#define DBIbf_set(bitset,flag,on)       ((on) ? DBIbf_on(bitset, flag) : DBIbf_off(bitset,flag))

/* as above, but specifically for DBIc_FLAGS imp flags (except ACTIVE)  */
#define DBIc_is(imp, flag)      DBIbf_is( DBIc_FLAGS(imp), flag)
#define DBIc_has(imp,flag)      DBIc_is(imp, flag) /* alias for DBIc_is */
#define DBIc_on(imp, flag)      DBIbf_on( DBIc_FLAGS(imp), flag)
#define DBIc_off(imp,flag)      DBIbf_off(DBIc_FLAGS(imp), flag)
#define DBIc_set(imp,flag,on)   DBIbf_set(DBIc_FLAGS(imp), flag, on)

#define DBIc_COMSET(imp)        DBIc_is(imp, DBIcf_COMSET)
#define DBIc_COMSET_on(imp)     DBIc_on(imp, DBIcf_COMSET)
#define DBIc_COMSET_off(imp)    DBIc_off(imp,DBIcf_COMSET)

#define DBIc_IMPSET(imp)        DBIc_is(imp, DBIcf_IMPSET)
#define DBIc_IMPSET_on(imp)     DBIc_on(imp, DBIcf_IMPSET)
#define DBIc_IMPSET_off(imp)    DBIc_off(imp,DBIcf_IMPSET)

#define DBIc_ACTIVE(imp)        (DBIc_FLAGS(imp) &   DBIcf_ACTIVE)
#define DBIc_ACTIVE_on(imp)     /* adjust parent's active kid count */  \
    do {                                                                \
        imp_xxh_t *ph_com = DBIc_PARENT_COM(imp);                       \
        if (!DBIc_ACTIVE(imp) && ph_com && !PL_dirty                    \
                && ++DBIc_ACTIVE_KIDS(ph_com) > DBIc_KIDS(ph_com))      \
            croak("panic: DBI active kids (%ld) > kids (%ld)",          \
                (long)DBIc_ACTIVE_KIDS(ph_com),                         \
                (long)DBIc_KIDS(ph_com));                               \
        DBIc_FLAGS(imp) |=  DBIcf_ACTIVE;                               \
    } while(0)
#define DBIc_ACTIVE_off(imp)    /* adjust parent's active kid count */  \
    do {                                                                \
        imp_xxh_t *ph_com = DBIc_PARENT_COM(imp);                       \
        if (DBIc_ACTIVE(imp) && ph_com && !PL_dirty                     \
                && (--DBIc_ACTIVE_KIDS(ph_com) > DBIc_KIDS(ph_com)      \
                   || DBIc_ACTIVE_KIDS(ph_com) < 0) )                   \
            croak("panic: DBI active kids (%ld) < 0 or > kids (%ld)",   \
                (long)DBIc_ACTIVE_KIDS(ph_com),                         \
                (long)DBIc_KIDS(ph_com));                               \
        DBIc_FLAGS(imp) &= ~DBIcf_ACTIVE;                               \
    } while(0)

#define DBIc_IADESTROY(imp)     (DBIc_FLAGS(imp) &   DBIcf_IADESTROY)
#define DBIc_IADESTROY_on(imp)  (DBIc_FLAGS(imp) |=  DBIcf_IADESTROY)
#define DBIc_IADESTROY_off(imp) (DBIc_FLAGS(imp) &= ~DBIcf_IADESTROY)

#define DBIc_AIADESTROY(imp)     (DBIc_FLAGS(imp) &   DBIcf_AIADESTROY)
#define DBIc_AIADESTROY_on(imp)  (DBIc_FLAGS(imp) |=  DBIcf_AIADESTROY)
#define DBIc_AIADESTROY_off(imp) (DBIc_FLAGS(imp) &= ~DBIcf_AIADESTROY)

#define DBIc_WARN(imp)          (DBIc_FLAGS(imp) &   DBIcf_WARN)
#define DBIc_WARN_on(imp)       (DBIc_FLAGS(imp) |=  DBIcf_WARN)
#define DBIc_WARN_off(imp)      (DBIc_FLAGS(imp) &= ~DBIcf_WARN)

#define DBIc_COMPAT(imp)        (DBIc_FLAGS(imp) &   DBIcf_COMPAT)
#define DBIc_COMPAT_on(imp)     (DBIc_FLAGS(imp) |=  DBIcf_COMPAT)
#define DBIc_COMPAT_off(imp)    (DBIc_FLAGS(imp) &= ~DBIcf_COMPAT)


#ifdef IN_DBI_XS                /* get Handle Common Data Structure     */
#define DBIh_COM(h)             (dbih_getcom2(aTHX_ h, 0))
#else
#define DBIh_COM(h)             (DBIS->getcom(h))
#define neatsvpv(sv,len)        (DBIS->neat_svpv(sv,len))
#endif

/* --- For sql_type_cast_svpv() --- */

#define DBIstcf_DISCARD_STRING  0x0001
#define DBIstcf_STRICT          0x0002

/* --- Implementors Private Data Support --- */

#define D_impdata(name,type,h)  type *name = (type*)(DBIh_COM(h))
#define D_imp_drh(h) D_impdata(imp_drh, imp_drh_t, h)
#define D_imp_dbh(h) D_impdata(imp_dbh, imp_dbh_t, h)
#define D_imp_sth(h) D_impdata(imp_sth, imp_sth_t, h)
#define D_imp_xxh(h) D_impdata(imp_xxh, imp_xxh_t, h)

#define D_imp_from_child(name,type,child)       \
                                type *name = (type*)(DBIc_PARENT_COM(child))
#define D_imp_drh_from_dbh D_imp_from_child(imp_drh, imp_drh_t, imp_dbh)
#define D_imp_dbh_from_sth D_imp_from_child(imp_dbh, imp_dbh_t, imp_sth)

#define DBI_IMP_SIZE(n,s) sv_setiv(get_sv((n), GV_ADDMULTI), (s)) /* XXX */



/* --- Event Support (VERY LIABLE TO CHANGE) --- */

#define DBIh_EVENTx(h,t,a1,a2)  /* deprecated XXX */ &PL_sv_no
#define DBIh_EVENT0(h,t)        DBIh_EVENTx((h), (t), &PL_sv_undef, &PL_sv_undef)
#define DBIh_EVENT1(h,t, a1)    DBIh_EVENTx((h), (t), (a1),         &PL_sv_undef)
#define DBIh_EVENT2(h,t, a1,a2) DBIh_EVENTx((h), (t), (a1),         (a2))

#define ERROR_event     "ERROR"
#define WARN_event      "WARN"
#define MSG_event       "MESSAGE"
#define DBEVENT_event   "DBEVENT"
#define UNKNOWN_event   "UNKNOWN"

#define DBIh_SET_ERR_SV(h,i, err, errstr, state, method) \
        (DBIc_DBISTATE(i)->set_err_sv(h,i, err, errstr, state, method))
#define DBIh_SET_ERR_CHAR(h,i, err_c, err_i, errstr, state, method) \
        (DBIc_DBISTATE(i)->set_err_char(h,i, err_c, err_i, errstr, state, method))


/* --- Handy Macros --- */

#define DBIh_CLEAR_ERROR(imp_xxh) (void)( \
        (void)SvOK_off(DBIc_ERR(imp_xxh)),      \
        (void)SvOK_off(DBIc_ERRSTR(imp_xxh)),   \
        (void)SvOK_off(DBIc_STATE(imp_xxh))     \
    )


/* --- DBI State Structure --- */

struct dbistate_st {

/* DBISTATE_VERSION is checked at runtime via DBISTATE_INIT and check_version.
 * It should be incremented on incompatible changes to dbistate_t structure.
 * Additional function pointers being assigned from spare padding, where the
 * size of the structure doesn't change, doesn't require an increment.
 * Incrementing forces all XS drivers to need to be recompiled.
 * (See also DBIXS_REVISION as a driver source compatibility tool.)
 */
#define DBISTATE_VERSION  94   /* ++ on incompatible dbistate_t changes */

    /* this must be the first member in structure                       */
    void (*check_version) _((const char *name,
                int dbis_cv, int dbis_cs, int need_dbixs_cv,
                int drc_s, int dbc_s, int stc_s, int fdc_s));

    /* version and size are used to check for DBI/DBD version mis-match */
    U16 version;        /* version of this structure                    */
    U16 size;
    U16 xs_version;     /* version of the overall DBIXS / DBD interface */
    U16 spare_pad;

    I32 debug;
    PerlIO *logfp;

    /* pointers to DBI functions which the DBD's will want to use       */
    char      * (*neat_svpv)    _((SV *sv, STRLEN maxlen));
    imp_xxh_t * (*getcom)       _((SV *h));     /* see DBIh_COM macro   */
    void        (*clearcom)     _((imp_xxh_t *imp_xxh));
    SV        * (*event)        _((SV *h, const char *name, SV*, SV*));
    int         (*set_attr_k)   _((SV *h, SV *keysv, int dbikey, SV *valuesv));
    SV        * (*get_attr_k)   _((SV *h, SV *keysv, int dbikey));
    AV        * (*get_fbav)     _((imp_sth_t *imp_sth));
    SV        * (*make_fdsv)    _((SV *sth, const char *imp_class, STRLEN imp_size, const char *col_name));
    int         (*bind_as_num)  _((int sql_type, int p, int s, int *t, void *v)); /* XXX deprecated */
    I32         (*hash)         _((const char *string, long i));
    SV        * (*preparse)     _((SV *sth, char *statement, IV ps_return, IV ps_accept, void *foo));

    SV *neatsvpvlen;            /* only show dbgpvlen chars when debugging pv's */

    PerlInterpreter * thr_owner;        /* thread that owns this dbistate       */

    int         (*logmsg)       _((imp_xxh_t *imp_xxh, const char *fmt, ...));
    int         (*set_err_sv)   _((SV *h, imp_xxh_t *imp_xxh, SV   *err, SV   *errstr, SV   *state, SV   *method));
    int         (*set_err_char) _((SV *h, imp_xxh_t *imp_xxh, const char *err, IV err_i, const char *errstr, const char *state, const char *method));
    int         (*bind_col)     _((SV *sth, SV *col, SV *ref, SV *attribs));

    IO *logfp_ref;              /* keep ptr to filehandle for refcounting */

    int         (*sql_type_cast_svpv) _((pTHX_ SV *sv, int sql_type, U32 flags, void *v));

    /* WARNING: Only add new structure members here, and reduce pad2 to keep */
    /* the memory footprint exactly the same */
    void *pad2[3];
};

/* macros for backwards compatibility */
#define set_attr(h, k, v)       set_attr_k(h, k, 0, v)
#define get_attr(h, k)          get_attr_k(h, k, 0)

#define DBILOGFP        (DBIS->logfp)
#ifdef IN_DBI_XS
#define DBILOGMSG       (dbih_logmsg)
#else
#define DBILOGMSG       (DBIS->logmsg)
#endif

/* --- perl object (ActiveState) / multiplicity hooks and hoops --- */
/* note that USE_ITHREADS implies MULTIPLICITY                      */

typedef dbistate_t** (*_dbi_state_lval_t)(pTHX);

# define _DBISTATE_DECLARE_COMMON \
    static _dbi_state_lval_t dbi_state_lval_p = 0;                          \
    static dbistate_t** dbi_get_state(pTHX) {                               \
        if (!dbi_state_lval_p) {                                            \
            CV *cv = get_cv("DBI::_dbi_state_lval", 0);                     \
            if (!cv)                                                        \
                croak("Unable to get DBI state function. DBI not loaded."); \
            dbi_state_lval_p = (_dbi_state_lval_t)CvXSUB(cv);               \
        }                                                                   \
        return dbi_state_lval_p(aTHX);                                      \
    }                                                                       \
    typedef int dummy_dbistate /* keep semicolon from feeling lonely */

#if defined(MULTIPLICITY) || defined(PERL_OBJECT) || defined(PERL_CAPI)

# define DBISTATE_DECLARE _DBISTATE_DECLARE_COMMON
# define _DBISTATE_INIT_DBIS
# undef  DBIS
# define DBIS (*dbi_get_state(aTHX))
# define dbis DBIS /* temp for old drivers using 'dbis' instead of 'DBIS' */

#else   /* plain and simple non perl object / multiplicity case */

# define DBISTATE_DECLARE \
    static dbistate_t *DBIS; \
    _DBISTATE_DECLARE_COMMON

# define _DBISTATE_INIT_DBIS      DBIS = *dbi_get_state(aTHX);
#endif

# define DBISTATE_INIT {        /* typically use in BOOT: of XS file    */    \
    _DBISTATE_INIT_DBIS \
    if (DBIS == NULL)   \
        croak("Unable to get DBI state. DBI not loaded."); \
    DBIS->check_version(__FILE__, DBISTATE_VERSION, sizeof(*DBIS), NEED_DBIXS_VERSION, \
                sizeof(dbih_drc_t), sizeof(dbih_dbc_t), sizeof(dbih_stc_t), sizeof(dbih_fdc_t) \
    ); \
}


/* --- Assorted Utility Macros  --- */

#define DBD_ATTRIB_OK(attribs)  /* is this a usable attrib value */     \
        (attribs && SvROK(attribs) && SvTYPE(SvRV(attribs))==SVt_PVHV)

/* If attribs value supplied then croak if it's not a hash ref.         */
/* Also map undef to Null. Should always be called to pre-process the   */
/* attribs value. One day we may add some extra magic in here.          */
#define DBD_ATTRIBS_CHECK(func, h, attribs)     \
    if ((attribs) && SvOK(attribs)) {           \
        if (!SvROK(attribs) || SvTYPE(SvRV(attribs))!=SVt_PVHV)         \
            croak("%s->%s(...): attribute parameter '%s' is not a hash ref",    \
                    SvPV_nolen(h), func, SvPV_nolen(attribs));          \
    } else (attribs) = Nullsv

#define DBD_ATTRIB_GET_SVP(attribs, key,klen)                   \
        (DBD_ATTRIB_OK(attribs)                                 \
            ? hv_fetch((HV*)SvRV(attribs), key,klen, 0)         \
            : (SV **)Nullsv)

#define DBD_ATTRIB_GET_IV(attribs, key,klen, svp, var)                  \
        if ((svp=DBD_ATTRIB_GET_SVP(attribs, key,klen)) != NULL)        \
            var = SvIV(*svp)

#define DBD_ATTRIB_GET_UV(attribs, key,klen, svp, var)                  \
        if ((svp=DBD_ATTRIB_GET_SVP(attribs, key,klen)) != NULL)        \
            var = SvUV(*svp)

#define DBD_ATTRIB_GET_BOOL(attribs, key,klen, svp, var)                \
        if ((svp=DBD_ATTRIB_GET_SVP(attribs, key,klen)) != NULL)        \
            var = SvTRUE(*svp)

#define DBD_ATTRIB_TRUE(attribs, key,klen, svp)                         \
        (  ((svp=DBD_ATTRIB_GET_SVP(attribs, key,klen)) != NULL)        \
            ? SvTRUE(*svp) : 0 )

#define DBD_ATTRIB_GET_PV(attribs, key,klen, svp, dflt)                 \
        (((svp=DBD_ATTRIB_GET_SVP(attribs, key,klen)) != NULL)          \
            ? SvPV_nolen(*svp) : (dflt))

#define DBD_ATTRIB_DELETE(attribs, key, klen)                   \
        hv_delete((HV*)SvRV(attribs), key, klen, G_DISCARD)

#endif /* DBIXS_VERSION */
/* end of DBIXS.h */