tds.h

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/* FreeTDS - Library of routines accessing Sybase and Microsoft databases
 * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005  Brian Bruns
 * Copyright (C) 2010, 2011  Frediano Ziglio
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
 
#ifndef _tds_h_
#define _tds_h_
 
#include <stdarg.h>
#include <stdio.h>
#include <time.h>
#include <sys/types.h>
 
#include <config.h>
 
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
 
#if HAVE_NETDB_H
#include <netdb.h>
#endif /* HAVE_NETDB_H */
 
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif /* HAVE_NET_INET_IN_H */
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif /* HAVE_ARPA_INET_H */
 
/* forward declaration */
typedef struct tdsiconvinfo TDSICONV;
typedef struct tds_connection TDSCONNECTION;
typedef struct tds_socket TDSSOCKET;
typedef struct tds_column TDSCOLUMN;
typedef struct tds_bcpinfo TDSBCPINFO;
/* More, to address "declared with greater visibility" warnings. */
typedef struct tds_authentication  TDSAUTHENTICATION;
typedef struct tds_bcpcoldata      BCPCOLDATA;
typedef struct tds_capabilities    TDS_CAPABILITIES;
typedef struct tds_capability_type TDS_CAPABILITY_TYPE;
typedef struct tds_column_funcs    TDSCOLUMNFUNCS;
typedef struct tds_context         TDSCONTEXT;
typedef struct tds_cursor          TDSCURSOR;
typedef struct tds_cursor_status   TDS_CURSOR_STATUS;
typedef struct tds_dstr           *DSTR;
typedef struct tds_dynamic         TDSDYNAMIC;
typedef struct tds_env             TDSENV;
typedef struct tds_locale          TDSLOCALE;
typedef struct tds_login           TDSLOGIN;
typedef struct tds_packet          TDSPACKET;
typedef struct tds_poll_wakeup     TDSPOLLWAKEUP;
typedef struct tds_result_info     TDSCOMPUTEINFO;
typedef struct tds_result_info     TDSRESULTINFO;
typedef TDSRESULTINFO              TDSPARAMINFO;
 
#include <freetds/version.h>
#include "tds_sysdep_public.h"
#include <freetds/sysdep_private.h>
#include <freetds/thread.h>
#include <freetds/bool.h>
#include "replacements.h"
 
#include <freetds/pushvis.h>
 
#ifdef __cplusplus
extern "C"
{
#if 0
}
#endif
#endif
 
/**
 * A structure to hold all the compile-time settings.
 * This structure is returned by tds_get_compiletime_settings
 */
 
typedef struct tds_compiletime_settings
{
    const char *freetds_version;    /* release version of FreeTDS */
    const char *sysconfdir;     /* location of freetds.conf */
    const char *last_update;    /* latest software_version date among the modules */
    int msdblib;        /* for MS style dblib */
    int sybase_compat;  /* enable increased Open Client binary compatibility */
    int threadsafe;     /* compile for thread safety default=no */
    int libiconv;       /* search for libiconv in DIR/include and DIR/lib */
    const char *tdsver; /* TDS protocol version (4.2/4.6/5.0/7.0/7.1) 5.0 */
    int iodbc;      /* build odbc driver against iODBC in DIR */
    int unixodbc;       /* build odbc driver against unixODBC in DIR */
    int openssl;        /* build against OpenSSL */
    int gnutls;     /* build against GnuTLS */
    int mars;       /* MARS enabled */
} TDS_COMPILETIME_SETTINGS;
 
/**
 * Structure to hold a string.
 * Use tds_dstr_* functions/macros, do not access members directly.
 * There should be always a buffer.
 */
struct tds_dstr {
    size_t dstr_size;
    char dstr_s[1];
} /* *DSTR */;
 
/**
 * @file tds.h
 * Main include file for libtds
 */
 
/**
 * \defgroup libtds LibTDS API
 * Callable functions in \c libtds.
 * 
 * The \c libtds library is for use internal to \em FreeTDS.  It is not
 * intended for use by applications.  Although any use is \em permitted, you're
 * encouraged to use one of the established public APIs instead, because their
 * interfaces are stable and documented by the vendors.  
 */
 
/* 
 * All references to data that touch the wire should use the following typedefs.  
 *
 * If you have problems on 64-bit machines and the code is 
 * using a native datatype, please change it to use
 * these. (In the TDS layer only, the API layers have their
 * own typedefs which equate to these).
 */
typedef char TDS_CHAR;                  /*  8-bit char     */
typedef unsigned char TDS_UCHAR;            /*  8-bit uchar    */
typedef unsigned char TDS_TINYINT;          /*  8-bit unsigned */
typedef tds_sysdep_int16_type TDS_SMALLINT;     /* 16-bit int      */
typedef tds_sysdep_uint16_type TDS_USMALLINT;           /* 16-bit unsigned */
typedef tds_sysdep_int32_type TDS_INT;          /* 32-bit int      */
typedef tds_sysdep_uint32_type TDS_UINT;                /* 32-bit unsigned */
typedef tds_sysdep_real32_type TDS_REAL;        /* 32-bit real     */
typedef tds_sysdep_real64_type TDS_FLOAT;       /* 64-bit real     */
typedef tds_sysdep_int64_type TDS_INT8;         /* 64-bit integer  */
typedef tds_sysdep_uint64_type TDS_UINT8;               /* 64-bit unsigned */
typedef tds_sysdep_intptr_type TDS_INTPTR;
typedef tds_sysdep_uintptr_type TDS_UINTPTR;
 
#include <freetds/proto.h>
 
#define TDS_INVALID_TYPE ((TDS_SERVER_TYPE) 0)
 
/**
 * this structure is not directed connected to a TDS protocol but
 * keeps any DATE/TIME information.
 */
typedef struct
{
    TDS_UINT8   time;   /**< time, 7 digit precision */
    TDS_INT      date;  /**< date, 0 = 1900-01-01 */
    TDS_SMALLINT offset;    /**< time offset */
    TDS_USMALLINT time_prec:3;
    TDS_USMALLINT _tds_reserved:10;
    TDS_USMALLINT has_time:1;
    TDS_USMALLINT has_date:1;
    TDS_USMALLINT has_offset:1;
} TDS_DATETIMEALL;
 
/** Used by tds_datecrack */
typedef struct tdsdaterec
{
    TDS_INT year;          /**< year */
    TDS_INT quarter;       /**< quarter (0-3) */
    TDS_INT month;         /**< month number (0-11) */
    TDS_INT day;           /**< day of month (1-31) */
    TDS_INT dayofyear;     /**< day of year  (1-366) */
    TDS_INT weekday;       /**< day of week  (0-6, 0 = sunday) */
    TDS_INT hour;          /**< 0-23 */
    TDS_INT minute;        /**< 0-59 */
    TDS_INT second;        /**< 0-59 */
    TDS_INT decimicrosecond;   /**< 0-9999999 */
    TDS_INT timezone;      /**< -840 - 840 minutes from UTC */
} TDSDATEREC;
 
/**
 * The following little table is indexed by precision and will
 * tell us the number of bytes required to store the specified
 * precision.
 */
extern const int tds_numeric_bytes_per_prec[];
 
typedef int TDSRET;
#define TDS_NO_MORE_RESULTS  ((TDSRET)1)
#define TDS_SUCCESS          ((TDSRET)0)
#define TDS_FAIL             ((TDSRET)-1)
#define TDS_CANCELLED        ((TDSRET)-2)
#define TDS_FAILED(rc) ((rc)<0)
#define TDS_SUCCEED(rc) ((rc)>=0)
 
#define TDS_INT_CONTINUE 1
#define TDS_INT_CANCEL 2
#define TDS_INT_TIMEOUT 3
 
 
#define TDS_NO_COUNT         -1
 
#define TDS_ROW_RESULT        4040
#define TDS_PARAM_RESULT      4042
#define TDS_STATUS_RESULT     4043
#define TDS_MSG_RESULT        4044
#define TDS_COMPUTE_RESULT    4045
#define TDS_CMD_DONE          4046
#define TDS_CMD_SUCCEED       4047
#define TDS_CMD_FAIL          4048
#define TDS_ROWFMT_RESULT     4049
#define TDS_COMPUTEFMT_RESULT 4050
#define TDS_DESCRIBE_RESULT   4051
#define TDS_DONE_RESULT       4052
#define TDS_DONEPROC_RESULT   4053
#define TDS_DONEINPROC_RESULT 4054
#define TDS_OTHERS_RESULT     4055
 
enum tds_token_results
{
    TDS_TOKEN_RES_OTHERS,
    TDS_TOKEN_RES_ROWFMT,
    TDS_TOKEN_RES_COMPUTEFMT,
    TDS_TOKEN_RES_PARAMFMT,
    TDS_TOKEN_RES_DONE,
    TDS_TOKEN_RES_ROW,
    TDS_TOKEN_RES_COMPUTE,
    TDS_TOKEN_RES_PROC,
    TDS_TOKEN_RES_MSG,
    TDS_TOKEN_RES_ENV,
};
 
#define TDS_TOKEN_FLAG(flag) TDS_RETURN_##flag = (1 << (TDS_TOKEN_RES_##flag*2)), TDS_STOPAT_##flag = (2 << (TDS_TOKEN_RES_##flag*2))
 
enum tds_token_flags
{
    TDS_HANDLE_ALL = 0,
    TDS_TOKEN_FLAG(OTHERS),
    TDS_TOKEN_FLAG(ROWFMT),
    TDS_TOKEN_FLAG(COMPUTEFMT),
    TDS_TOKEN_FLAG(PARAMFMT),
    TDS_TOKEN_FLAG(DONE),
    TDS_TOKEN_FLAG(ROW),
    TDS_TOKEN_FLAG(COMPUTE),
    TDS_TOKEN_FLAG(PROC),
    TDS_TOKEN_FLAG(MSG),
    TDS_TOKEN_FLAG(ENV),
    TDS_TOKEN_RESULTS = TDS_RETURN_ROWFMT|TDS_RETURN_COMPUTEFMT|TDS_RETURN_DONE|TDS_STOPAT_ROW|TDS_STOPAT_COMPUTE|TDS_RETURN_PROC,
    TDS_TOKEN_TRAILING = TDS_STOPAT_ROWFMT|TDS_STOPAT_COMPUTEFMT|TDS_STOPAT_ROW|TDS_STOPAT_COMPUTE|TDS_STOPAT_MSG|TDS_STOPAT_OTHERS
};
 
/**
 * Flags returned in TDS_DONE token
 */
enum tds_end
{
      TDS_DONE_FINAL    = 0x00  /**< final result set, command completed successfully. */
    , TDS_DONE_MORE_RESULTS = 0x01  /**< more results follow */
    , TDS_DONE_ERROR    = 0x02  /**< error occurred */
    , TDS_DONE_INXACT   = 0x04  /**< transaction in progress */
    , TDS_DONE_PROC     = 0x08  /**< results are from a stored procedure */
    , TDS_DONE_COUNT    = 0x10  /**< count field in packet is valid */
    , TDS_DONE_CANCELLED    = 0x20  /**< acknowledging an attention command (usually a cancel) */
    , TDS_DONE_EVENT    = 0x40  /*   part of an event notification. */
    , TDS_DONE_SRVERROR     = 0x100 /**< SQL server server error */
    
    /* after the above flags, a TDS_DONE packet has a field describing the state of the transaction */
    , TDS_DONE_NO_TRAN  = 0 /* No transaction in effect */
    , TDS_DONE_TRAN_SUCCEED = 1 /* Transaction completed successfully */
    , TDS_DONE_TRAN_PROGRESS= 2 /* Transaction in progress */
    , TDS_DONE_STMT_ABORT   = 3 /* A statement aborted */
    , TDS_DONE_TRAN_ABORT   = 4 /* Transaction aborted */
};
 
 
/*
 * TDSERRNO is emitted by libtds to the client library's error handler
 * (which may in turn call the client's error handler).
 * These match the db-lib msgno, because the same values have the same meaning
 * in db-lib and ODBC.  ct-lib maps them to ct-lib numbers (todo). 
 */
typedef enum {  TDSEOK    = TDS_SUCCESS, 
        TDSEVERDOWN    =  100,
        TDSEICONVIU    = 2400, 
        TDSEICONVAVAIL = 2401, 
        TDSEICONVO     = 2402, 
        TDSEICONVI     = 2403, 
        TDSEICONV2BIG  = 2404,
        TDSEPORTINSTANCE    = 2500,
        TDSESYNC = 20001, 
        TDSEFCON = 20002, 
        TDSETIME = 20003, 
        TDSEREAD = 20004, 
        TDSEWRIT = 20006, 
        TDSESOCK = 20008, 
        TDSECONN = 20009, 
        TDSEMEM  = 20010,
        TDSEINTF = 20012,   /* Server name not found in interface file */
        TDSEUHST = 20013,   /* Unknown host machine name. */
        TDSEPWD  = 20014, 
        TDSESEOF = 20017, 
        TDSERPND = 20019, 
        TDSEBTOK = 20020, 
        TDSEOOB  = 20022, 
        TDSECLOS = 20056,
        TDSEUSCT = 20058, 
        TDSEUTDS = 20146, 
        TDSEEUNR = 20185, 
        TDSECAP  = 20203, 
        TDSENEG  = 20210, 
        TDSEUMSG = 20212, 
        TDSECAPTYP  = 20213, 
        TDSECONF = 20214,
        TDSEBPROBADTYP = 20250,
        TDSECLOSEIN = 20292 
} TDSERRNO;
 
 
enum {
    TDS_CUR_ISTAT_UNUSED    = 0x00,
    TDS_CUR_ISTAT_DECLARED  = 0x01,
    TDS_CUR_ISTAT_OPEN      = 0x02,
    TDS_CUR_ISTAT_CLOSED    = 0x04,
    TDS_CUR_ISTAT_RDONLY    = 0x08,
    TDS_CUR_ISTAT_UPDATABLE = 0x10,
    TDS_CUR_ISTAT_ROWCNT    = 0x20,
    TDS_CUR_ISTAT_DEALLOC   = 0x40
};
 
/* string types */
#define TDS_NULLTERM -9
 
 
typedef union tds_option_arg
{
    TDS_TINYINT ti;
    TDS_INT i;
    TDS_CHAR *c;
} TDS_OPTION_ARG;
 
 
typedef enum tds_encryption_level {
    TDS_ENCRYPTION_OFF, TDS_ENCRYPTION_REQUEST, TDS_ENCRYPTION_REQUIRE
} TDS_ENCRYPTION_LEVEL;
 
#define TDS_ZERO_FREE(x) do {free((x)); (x) = NULL;} while(0)
#define TDS_VECTOR_SIZE(x) (sizeof(x)/sizeof(x[0]))
#ifdef offsetof
#define TDS_OFFSET(str, field) offsetof(str, field)
#else
#define TDS_OFFSET(str, field) (((char*)&((str*)0)->field)-((char*)0))
#endif
 
#if defined(__GNUC__) && __GNUC__ >= 3
# define TDS_LIKELY(x)  __builtin_expect(!!(x), 1)
# define TDS_UNLIKELY(x)    __builtin_expect(!!(x), 0)
#else
# define TDS_LIKELY(x)  (x)
# define TDS_UNLIKELY(x)    (x)
#endif
 
#if ENABLE_EXTRA_CHECKS
# if defined(__llvm__)  \
     ||  (defined(__GNUC__)  \
          &&  (__GNUC__ >= 5  ||  (__GNUC__  == 4  &&  __GNUC_MINOR__ >= 6)))
# define TDS_COMPILE_CHECK(name,check) \
    _Static_assert(check,#name)
# elif defined(__GNUC__) && __GNUC__ >= 2
# define TDS_COMPILE_CHECK(name,check) \
    extern int name[(check)?1:-1] __attribute__ ((unused))
# else
# define TDS_COMPILE_CHECK(name,check) \
    extern int name[(check)?1:-1]
# endif
# define TDS_EXTRA_CHECK(stmt) stmt
#else
# define TDS_COMPILE_CHECK(name,check) \
    extern int disabled_check_##name
# define TDS_EXTRA_CHECK(stmt)
#endif
 
#if ENABLE_EXTRA_CHECKS && defined(__GNUC__) && __GNUC__ >= 4
#define TDS_WUR __attribute__ ((__warn_unused_result__))
#else
#define TDS_WUR
#endif
 
/*
 * TODO use system macros for optimization
 * See mcrypt for reference and linux kernel source for optimization
 * check if unaligned access and use fast write/read when implemented
 */
#define TDS_BYTE_SWAP16(value)                 \
         (((((unsigned short)value)<<8) & 0xFF00)   | \
          ((((unsigned short)value)>>8) & 0x00FF))
 
#define TDS_BYTE_SWAP32(value)                     \
         (((((unsigned long)value)<<24) & 0xFF000000)  | \
          ((((unsigned long)value)<< 8) & 0x00FF0000)  | \
          ((((unsigned long)value)>> 8) & 0x0000FF00)  | \
          ((((unsigned long)value)>>24) & 0x000000FF))
 
#define is_end_token(x) (x==TDS_DONE_TOKEN    || \
            x==TDS_DONEPROC_TOKEN    || \
            x==TDS_DONEINPROC_TOKEN)
 
enum {
    TDS_TYPEFLAG_INVALID  = 0,
    TDS_TYPEFLAG_NULLABLE = 1,
    TDS_TYPEFLAG_FIXED    = 2,
    TDS_TYPEFLAG_VARIABLE = 4,
    TDS_TYPEFLAG_COLLATE  = 8,
    TDS_TYPEFLAG_ASCII    = 16,
    TDS_TYPEFLAG_UNICODE  = 32,
    TDS_TYPEFLAG_NUMERIC  = 64,
    TDS_TYPEFLAG_DATETIME = 128,
};
 
extern const unsigned char tds_type_flags_ms[256];
#if 0
extern const unsigned char tds_type_flags_syb[256];
extern const char *const tds_type_names[256];
#endif
 
#define is_fixed_type(x)      ((tds_type_flags_ms[x] & TDS_TYPEFLAG_FIXED)    != 0)
#define is_nullable_type(x)   ((tds_type_flags_ms[x] & TDS_TYPEFLAG_NULLABLE) != 0)
#define is_variable_type(x)   ((tds_type_flags_ms[x] & TDS_TYPEFLAG_VARIABLE) != 0)
 
 
#define is_blob_type(x)       ((x)==SYBTEXT || (x)==SYBIMAGE || (x)==SYBNTEXT)
#if 1
#define is_blob_col(x) (is_blob_type((x)->column_type) \
                        ||  ((x)->column_varint_size == 8) \
                        ||  ((x)->column_type == SYBVARIANT \
                             &&  (x)->column_varint_size == 4))
#else
#define is_blob_col(x)        ((x)->column_varint_size > 2)
#endif
/* large type means it has a two byte size field */
/* define is_large_type(x) (x>128) */
#define is_numeric_type(x)    ((x)==SYBNUMERIC || (x)==SYBDECIMAL)
/** return true if type is a datetime (but not date or time) */
#define is_datetime_type(x)   ((tds_type_flags_ms[x] & TDS_TYPEFLAG_DATETIME) != 0)
#define is_unicode_type(x)    ((tds_type_flags_ms[x] & TDS_TYPEFLAG_UNICODE) != 0)
#define is_collate_type(x)    ((tds_type_flags_ms[x] & TDS_TYPEFLAG_COLLATE) != 0)
#define is_ascii_type(x)      ((tds_type_flags_ms[x] & TDS_TYPEFLAG_ASCII) != 0)
#define is_char_type(x)       ((tds_type_flags_ms[x] & (TDS_TYPEFLAG_ASCII|TDS_TYPEFLAG_UNICODE)) != 0)
#define is_similar_type(x, y) (is_char_type(x) && is_char_type(y))
static inline
bool is_tds_type_valid(int type)
{
    return (unsigned) type < 256u && tds_type_flags_ms[type] != 0;
}
 
 
#define TDS_MAX_CAPABILITY  32
#define MAXPRECISION        77
#define TDS_MAX_CONN        4096
#define TDS_MAX_DYNID_LEN   30
 
/* defaults to use if no others are found */
#define TDS_DEF_SERVER      "SYBASE"
#define TDS_DEF_BLKSZ       512
#define TDS_DEF_CHARSET     "iso_1"
#define TDS_DEF_LANG        "us_english"
#if TDS42
#define TDS_DEFAULT_VERSION 0x402
#define TDS_DEF_PORT        1433
#elif TDS46
#define TDS_DEFAULT_VERSION 0x406
#define TDS_DEF_PORT        4000
#elif TDS50
#define TDS_DEFAULT_VERSION 0x500
#define TDS_DEF_PORT        4000
#elif TDS70
#define TDS_DEFAULT_VERSION 0x700
#define TDS_DEF_PORT        1433
#elif TDS71
#define TDS_DEFAULT_VERSION 0x701
#define TDS_DEF_PORT        1433
#elif TDS72
#define TDS_DEFAULT_VERSION 0x702
#define TDS_DEF_PORT        1433
#elif TDS73
#define TDS_DEFAULT_VERSION 0x703
#define TDS_DEF_PORT        1433
#elif TDS74
#define TDS_DEFAULT_VERSION 0x704
#define TDS_DEF_PORT        1433
#else
#define TDS_DEFAULT_VERSION 0x000
#define TDS_DEF_PORT        1433
#endif
 
/* normalized strings from freetds.conf file */
#define TDS_STR_VERSION  "tds version"
#define TDS_STR_BLKSZ    "initial block size"
#define TDS_STR_SWAPDT   "swap broken dates"
#define TDS_STR_DUMPFILE "dump file"
#define TDS_STR_DEBUGLVL "debug level"
#define TDS_STR_DEBUGFLAGS "debug flags"
#define TDS_STR_TIMEOUT  "timeout"
#define TDS_STR_QUERY_TIMEOUT  "query timeout"
#define TDS_STR_CONNTIMEOUT "connect timeout"
#define TDS_STR_HOSTNAME "hostname"
#define TDS_STR_HOST     "host"
#define TDS_STR_PORT     "port"
#define TDS_STR_TEXTSZ   "text size"
/* for big endian hosts */
#define TDS_STR_EMUL_LE "emulate little endian"
#define TDS_STR_CHARSET "charset"
#define TDS_STR_CLCHARSET   "client charset"
#define TDS_STR_USE_UTF_16  "use utf-16"
#define TDS_STR_LANGUAGE    "language"
#define TDS_STR_APPENDMODE  "dump file append"
#define TDS_STR_DATEFMT "date format"
#define TDS_STR_INSTANCE "instance"
#define TDS_STR_ASA_DATABASE    "asa database"
#define TDS_STR_DATABASE    "database"
#define TDS_STR_ENCRYPTION   "encryption"
#define TDS_STR_USENTLMV2   "use ntlmv2"
#define TDS_STR_USELANMAN   "use lanman"
/* conf values */
#define TDS_STR_ENCRYPTION_OFF   "off"
#define TDS_STR_ENCRYPTION_REQUEST "request"
#define TDS_STR_ENCRYPTION_REQUIRE "require"
/* Defines to enable optional GSSAPI delegation */
#define TDS_GSSAPI_DELEGATION "enable gssapi delegation"
/* Kerberos realm name */
#define TDS_STR_REALM   "realm"
/* Kerberos SPN */
#define TDS_STR_SPN "spn"
/* CA file */
#define TDS_STR_CAFILE  "ca file"
/* CRL file */
#define TDS_STR_CRLFILE "crl file"
/* check SSL hostname */
#define TDS_STR_CHECKSSLHOSTNAME    "check certificate hostname"
/* database filename to attach on login (MSSQL) */
#define TDS_STR_DBFILENAME  "database filename"
/* Application Intent MSSQL 2012 support */
#define TDS_STR_READONLY_INTENT "read-only intent"
/* configurable cipher suite to send to openssl's SSL_set_cipher_list() function */
#define TLS_STR_OPENSSL_CIPHERS "openssl ciphers"
 
 
/* TODO do a better check for alignment than this */
typedef union
{
    void *p;
    int i;
    TDS_INT8 ui;
} tds_align_struct;
 
#define TDS_ALIGN_SIZE sizeof(tds_align_struct)
 
struct tds_capability_type
{
    unsigned char type;
    unsigned char len; /* always sizeof(values) */
    unsigned char values[TDS_MAX_CAPABILITY/2-2];
} /* TDS_CAPABILITY_TYPE */;
 
struct tds_capabilities
{
    TDS_CAPABILITY_TYPE types[2];
} /* TDS_CAPABILITIES */;
 
#define TDS_MAX_LOGIN_STR_SZ 128
struct tds_login
{
    DSTR server_name;       /**< server name (in freetds.conf) */
    int port;           /**< port of database service */
    TDS_USMALLINT tds_version;  /**< TDS version */
    int block_size;
    DSTR language;          /* e.g. us-english */
    DSTR server_charset;        /**< charset of server e.g. iso_1 */
    TDS_INT connect_timeout;
    DSTR client_host_name;
    DSTR server_host_name;
    DSTR server_realm_name;     /**< server realm name (in freetds.conf) */
    DSTR server_spn;        /**< server SPN (in freetds.conf) */
    DSTR db_filename;       /**< database filename to attach (MSSQL) */
    DSTR cafile;            /**< certificate authorities file */
    DSTR crlfile;           /**< certificate revocation file */
    DSTR openssl_ciphers;
    DSTR app_name;
    DSTR user_name;         /**< account for login */
    DSTR password;          /**< password of account login */
    DSTR new_password;          /**< new password to set (TDS 7.2+) */
 
    DSTR library;   /* Ct-Library, DB-Library,  TDS-Library or ODBC */
    TDS_TINYINT encryption_level;
 
    TDS_INT query_timeout;
    TDS_CAPABILITIES capabilities;
    DSTR client_charset;
    DSTR database;
 
    struct addrinfo *ip_addrs;          /**< ip(s) of server */
    struct addrinfo *connected_addr;    /* ip of connected server */
    DSTR instance_name;
    DSTR dump_file;
    int debug_flags;
    int text_size;
    DSTR routing_address;
    TDS_USMALLINT routing_port;
 
    unsigned char option_flag2;
 
    unsigned int bulk_copy:1;   /**< if bulk copy should be enabled */
    unsigned int suppress_language:1;
    unsigned int emul_little_endian:1;
    unsigned int gssapi_use_delegation:1;
    unsigned int use_ntlmv2:1;
    unsigned int use_lanman:1;
    unsigned int mars:1;
    unsigned int use_utf16:1;
    unsigned int use_new_password:1;
    unsigned int valid_configuration:1;
    unsigned int check_ssl_hostname:1;
    unsigned int readonly_intent:1;
} /* TDSLOGIN */;
 
typedef struct tds_headers
{
    const char *qn_options;
    const char *qn_msgtext;
    TDS_INT qn_timeout;
    /* TDS 7.4+: trace activity ID char[20] */
} TDSHEADERS;
 
struct tds_locale
{
    char *language;
    char *server_charset;
    char *date_fmt;
} /* TDSLOCALE */;
 
/** 
 * Information about blobs (e.g. text or image).
 * current_row contains this structure.
 */
typedef struct tds_blob
{
    TDS_CHAR *textvalue;
    TDS_CHAR textptr[16];
    TDS_CHAR timestamp[8];
    unsigned char valid_ptr;
} TDSBLOB;
 
/**
 * Store variant informations
 */
typedef struct tds_variant
{
    /* this MUST have same position and place of textvalue in tds_blob */
    TDS_CHAR *data;
    TDS_INT size;
    TDS_INT data_len;
    TDS_SERVER_TYPE type;
    TDS_UCHAR collation[5];
} TDSVARIANT;
 
/**
 * Information relevant to libiconv.  The name is an iconv name, not 
 * the same as found in master..syslanguages. 
 */
typedef struct tds_encoding
{
    /** name of the encoding (ie UTF-8) */
    const char *name;
    unsigned char min_bytes_per_char;
    unsigned char max_bytes_per_char;
    /** internal numeric index into array of all encodings */
    unsigned char canonic;
} TDS_ENCODING;
 
struct tds_bcpcoldata
{
    TDS_UCHAR *data;
    TDS_INT    datalen;
    TDS_INT    is_null;
} /* BCPCOLDATA */;
 
 
typedef TDSRET  tds_func_get_info(TDSSOCKET *tds, TDSCOLUMN *col);
typedef TDSRET  tds_func_get_data(TDSSOCKET *tds, TDSCOLUMN *col);
typedef TDS_INT tds_func_row_len(TDSCOLUMN *col);
typedef unsigned tds_func_put_info_len(TDSSOCKET *tds, TDSCOLUMN *col);
typedef TDSRET  tds_func_put_info(TDSSOCKET *tds, TDSCOLUMN *col);
typedef TDSRET  tds_func_put_data(TDSSOCKET *tds, TDSCOLUMN *col, int bcp7);
typedef int     tds_func_check(const TDSCOLUMN *col);
 
struct tds_column_funcs
{
    tds_func_get_info *get_info;
    tds_func_get_data *get_data;
    tds_func_row_len  *row_len;
    /**
     * Returns metadata column information size.
     * \tds
     * \param col  column to send
     */
    tds_func_put_info_len *put_info_len;
    /**
     * Send metadata column information to server.
     * \tds
     * \param col  column to send
     */
    tds_func_put_info *put_info;
    /**
     * Send column data to server.
     * Usually send parameters unless bcp7 is specified, in
     * this case send BCP for TDS7+ (Sybase use a completely
     * different format for BCP)
     * \tds
     * \param col  column to send
     * \param bcp7 1 to send BCP column on TDS7+
     */
    tds_func_put_data *put_data;
#if ENABLE_EXTRA_CHECKS
    /**
     * Check column is valid.
     * Some things should be checked:
     * - column_type and on_server.column_type;
     * - column_size and on_server.column_size;
     * - column_cur_size;
     * - column_prec and column_scale;
     * - is_XXXX_type macros/functions (nullable/fixed/blob/variable);
     * - tds_get_size_by_type;
     * - tds_get_conversion_type.
     *
     * \tds
     * \param col  column to check
     */
    tds_func_check    *check;
#endif
#if 0
    TDSRET (*convert)(TDSSOCKET *tds, TDSCOLUMN *col);
#endif
} /* TDSCOLUMNFUNCS */;
 
/** 
 * Metadata about columns in regular and compute rows 
 */
struct tds_column
{
    const TDSCOLUMNFUNCS *funcs;
    TDS_INT column_usertype;
    TDS_INT column_flags;
 
    TDS_INT column_size;        /**< maximun size of data. For fixed is the size. */
 
    TDS_SERVER_TYPE column_type;    /**< This type can be different from wire type because
                     * conversion (e.g. UCS-2->Ascii) can be applied.
                     * I'm beginning to wonder about the wisdom of this, however.
                     * April 2003 jkl
                     */
    TDS_TINYINT column_varint_size; /**< size of length when reading from wire (0, 1, 2 or 4) */
 
    TDS_TINYINT column_prec;    /**< precision for decimal/numeric */
    TDS_TINYINT column_scale;   /**< scale for decimal/numeric */
 
    struct
    {
        TDS_SERVER_TYPE column_type;    /**< type of data, saved from wire */
        TDS_INT column_size;
    } on_server;
 
    TDSICONV *char_conv;    /**< refers to previously allocated iconv information */
 
    DSTR table_name;
    DSTR column_name;
    DSTR table_column_name;
 
        TDS_INT column_def_size;
        unsigned char* column_default;
 
    unsigned char *column_data;
    void (*column_data_free)(struct tds_column *column);
    unsigned int column_nullable:1;
    unsigned int column_writeable:1;
    unsigned int column_identity:1;
    unsigned int column_key:1;
    unsigned int column_hidden:1;
    unsigned int column_output:1;
    unsigned int column_timestamp:1;
        unsigned int column_hasdefault:1;
    TDS_UCHAR column_collation[5];
 
    /* additional fields flags for compute results */
    TDS_TINYINT column_operator;
    TDS_SMALLINT column_operand;
 
    /* FIXME this is data related, not column */
    /** size written in variable (ie: char, text, binary). -1 if NULL. */
    TDS_INT column_cur_size;
 
    /* related to binding or info stored by client libraries */
    /* FIXME find a best place to store these data, some are unused */
    TDS_SMALLINT column_bindtype;
    TDS_SMALLINT column_bindfmt;
    TDS_UINT column_bindlen;
    TDS_SMALLINT *column_nullbind;
    TDS_CHAR *column_varaddr;
    TDS_INT *column_lenbind;
    TDS_INT column_textpos;
    TDS_INT column_text_sqlgetdatapos;
    TDS_CHAR column_text_sqlputdatainfo;
 
    BCPCOLDATA *bcp_column_data;
    /**
     * The length, in bytes, of any length prefix this column may have.
     * For example, strings in some non-C programming languages are
     * made up of a one-byte length prefix, followed by the string
     * data itself.
     * If the data do not have a length prefix, set prefixlen to 0.
     * Currently not very used in code, however do not remove.
     */
    TDS_INT bcp_prefix_len;
    TDS_INT bcp_term_len;
    TDS_CHAR *bcp_terminator;
};
 
 
/** Hold information for any results */
struct tds_result_info
{
    /* TODO those fields can became a struct */
    TDSCOLUMN **columns;
    TDS_USMALLINT num_cols;
    TDS_USMALLINT computeid;
    TDS_INT ref_count;
    TDSSOCKET *attached_to;
    unsigned char *current_row;
    void (*row_free)(struct tds_result_info* result, unsigned char *row);
    TDS_INT row_size;
 
    TDS_SMALLINT *bycolumns;
    TDS_USMALLINT by_cols;
    TDS_TINYINT rows_exist;
    /* TODO remove ?? used only in dblib */
    TDS_TINYINT more_results;
} /* TDSRESULTINFO */;
 
/** values for tds->state */
typedef enum tds_states
{
    TDS_IDLE,   /**< no data expected */
    TDS_WRITING,    /**< client is writing data */
    TDS_SENDING,    /**< client would send data */
    TDS_PENDING,    /**< cilent is waiting for data */
    TDS_READING,    /**< client is reading data */
    TDS_DEAD    /**< no connection */
} TDS_STATE;
 
typedef enum tds_operations
{
    TDS_OP_NONE     = 0,
 
    /* mssql operations */
    TDS_OP_CURSOR       = TDS_SP_CURSOR,
    TDS_OP_CURSOROPEN   = TDS_SP_CURSOROPEN,
    TDS_OP_CURSORPREPARE    = TDS_SP_CURSORPREPARE,
    TDS_OP_CURSOREXECUTE    = TDS_SP_CURSOREXECUTE,
    TDS_OP_CURSORPREPEXEC   = TDS_SP_CURSORPREPEXEC,
    TDS_OP_CURSORUNPREPARE  = TDS_SP_CURSORUNPREPARE,
    TDS_OP_CURSORFETCH  = TDS_SP_CURSORFETCH,
    TDS_OP_CURSOROPTION = TDS_SP_CURSOROPTION,
    TDS_OP_CURSORCLOSE  = TDS_SP_CURSORCLOSE,
    TDS_OP_EXECUTESQL   = TDS_SP_EXECUTESQL,
    TDS_OP_PREPARE      = TDS_SP_PREPARE,
    TDS_OP_EXECUTE      = TDS_SP_EXECUTE,
    TDS_OP_PREPEXEC     = TDS_SP_PREPEXEC,
    TDS_OP_PREPEXECRPC  = TDS_SP_PREPEXECRPC,
    TDS_OP_UNPREPARE    = TDS_SP_UNPREPARE,
 
    /* sybase operations */
    TDS_OP_DYN_DEALLOC  = 100,
} TDS_OPERATION;
 
#define TDS_DBG_LOGIN   __FILE__, ((__LINE__ << 4) | 11)
#define TDS_DBG_HEADER  __FILE__, ((__LINE__ << 4) | 10)
#define TDS_DBG_FUNC    __FILE__, ((__LINE__ << 4) |  7)
#define TDS_DBG_INFO2   __FILE__, ((__LINE__ << 4) |  6)
#define TDS_DBG_INFO1   __FILE__, ((__LINE__ << 4) |  5)
#define TDS_DBG_NETWORK __FILE__, ((__LINE__ << 4) |  4)
#define TDS_DBG_WARN    __FILE__, ((__LINE__ << 4) |  3)
#define TDS_DBG_ERROR   __FILE__, ((__LINE__ << 4) |  2)
#define TDS_DBG_SEVERE  __FILE__, ((__LINE__ << 4) |  1)
 
#define TDS_DBGFLAG_FUNC    0x80
#define TDS_DBGFLAG_INFO2   0x40
#define TDS_DBGFLAG_INFO1   0x20
#define TDS_DBGFLAG_NETWORK 0x10
#define TDS_DBGFLAG_WARN    0x08
#define TDS_DBGFLAG_ERROR   0x04
#define TDS_DBGFLAG_SEVERE  0x02
#define TDS_DBGFLAG_ALL     0xfff
#define TDS_DBGFLAG_LOGIN   0x0800
#define TDS_DBGFLAG_HEADER  0x0400
#define TDS_DBGFLAG_PID     0x1000
#define TDS_DBGFLAG_TIME    0x2000
#define TDS_DBGFLAG_SOURCE  0x4000
#define TDS_DBGFLAG_THREAD  0x8000
 
#if 0
/**
 * An attempt at better logging.
 * Using these bitmapped values, various logging features can be turned on and off.
 * It can be especially helpful to turn packet data on/off for security reasons.
 */
enum TDS_DBG_LOG_STATE
{
      TDS_DBG_LOGIN =  (1 << 0) /**< for diagnosing login problems;                                       
                       otherwise the username/password information is suppressed. */
    , TDS_DBG_API =    (1 << 1) /**< Log calls to client libraries */
    , TDS_DBG_ASYNC =  (1 << 2) /**< Log asynchronous function starts or completes. */
    , TDS_DBG_DIAG =   (1 << 3) /**< Log client- and server-generated messages */
    , TDS_DBG_error =  (1 << 4)
    /* TODO:  ^^^^^ make upper case when old #defines (above) are removed */
    /* Log FreeTDS runtime/logic error occurs. */
    , TDS_DBG_PACKET = (1 << 5) /**< Log hex dump of packets to/from the server. */
    , TDS_DBG_LIBTDS = (1 << 6) /**< Log calls to (and in) libtds */
    , TDS_DBG_CONFIG = (1 << 7) /**< replaces TDSDUMPCONFIG */
    , TDS_DBG_DEFAULT = 0xFE    /**< all above except login packets */
};
#endif
 
typedef struct tds_message
{
    TDS_CHAR *server;
    TDS_CHAR *message;
    TDS_CHAR *proc_name;
    TDS_CHAR *sql_state;
    TDS_INT msgno;
    TDS_INT line_number;
    /* -1 .. 255 */
    TDS_SMALLINT state;
    TDS_TINYINT priv_msg_type;
    TDS_TINYINT severity;
    /* for library-generated errors */
    int oserr;
        TDS_CHAR *osstr;
} TDSMESSAGE;
 
typedef struct tds_upd_col
{
    struct tds_upd_col *next;   
    TDS_INT colnamelength;
    char * columnname;
} TDSUPDCOL;
 
typedef enum {
      TDS_CURSOR_STATE_UNACTIONED = 0       /* initial value */
    , TDS_CURSOR_STATE_REQUESTED = 1    /* called by ct_cursor */ 
    , TDS_CURSOR_STATE_SENT = 2     /* sent to server */
    , TDS_CURSOR_STATE_ACTIONED = 3     /* acknowledged by server */
} TDS_CURSOR_STATE;
 
struct tds_cursor_status
{
    TDS_CURSOR_STATE declare;
    TDS_CURSOR_STATE cursor_row;
    TDS_CURSOR_STATE open;
    TDS_CURSOR_STATE fetch;
    TDS_CURSOR_STATE close; 
    TDS_CURSOR_STATE dealloc;
} /* TDS_CURSOR_STATUS */;
 
typedef enum tds_cursor_operation
{
    TDS_CURSOR_POSITION = 0,
    TDS_CURSOR_UPDATE = 1,
    TDS_CURSOR_DELETE = 2,
    TDS_CURSOR_INSERT = 4
} TDS_CURSOR_OPERATION;
 
typedef enum tds_cursor_fetch
{
    TDS_CURSOR_FETCH_NEXT = 1,
    TDS_CURSOR_FETCH_PREV,
    TDS_CURSOR_FETCH_FIRST,
    TDS_CURSOR_FETCH_LAST,
    TDS_CURSOR_FETCH_ABSOLUTE,
    TDS_CURSOR_FETCH_RELATIVE
} TDS_CURSOR_FETCH;
 
/**
 * Holds informations about a cursor
 */
struct tds_cursor
{
    struct tds_cursor *next;    /**< next in linked list, keep first */
    TDS_INT ref_count;      /**< reference counter so client can retain safely a pointer */
    char *cursor_name;      /**< name of the cursor */
    TDS_INT cursor_id;      /**< cursor id returned by the server after cursor declare */
    TDS_TINYINT options;        /**< read only|updatable TODO use it */
    /**
     * true if cursor was marker to be closed when connection is idle
     */
    TDS_TINYINT defer_close;
    char *query;                    /**< SQL query */
    /* TODO for updatable columns */
    /* TDS_TINYINT number_upd_cols; */  /**< number of updatable columns */
    /* TDSUPDCOL *cur_col_list; */  /**< updatable column list */
    TDS_INT cursor_rows;        /**< number of cursor rows to fetch */
    /* TDSPARAMINFO *params; */ /** cursor parameter */
    TDS_CURSOR_STATUS status;
    TDS_USMALLINT srv_status;
    TDSRESULTINFO *res_info;    /** row fetched from this cursor */
    TDS_INT type, concurrency;
} /* TDSCURSOR */;
 
/**
 * Current environment as reported by the server
 */
struct tds_env
{
    /** packet size (512-65535) */
    int block_size;
    char *language;
    /** character set encoding */
    char *charset;
    /** database name */
    char *database;
} /* TDSENV */;
 
/**
 * Holds information for a dynamic (also called prepared) query.
 */
struct tds_dynamic
{
    struct tds_dynamic *next;   /**< next in linked list, keep first */
    TDS_INT ref_count;      /**< reference counter so client can retain safely a pointer */
    /** numeric id for mssql7+*/
    TDS_INT num_id;
    /** 
     * id of dynamic.
     * Usually this id correspond to server one but if not specified
     * is generated automatically by libTDS
     */
    char id[30];
    /**
     * this dynamic query cannot be prepared so libTDS have to construct a simple query.
     * This can happen for instance is tds protocol doesn't support dynamics or trying
     * to prepare query under Sybase that have BLOBs as parameters.
     */
    TDS_TINYINT emulated;
    /**
     * true if dynamic was marker to be closed when connection is idle
     */
    TDS_TINYINT defer_close;
    /* int dyn_state; */ /* TODO use it */
    TDSPARAMINFO *res_info; /**< query results */
    /**
     * query parameters.
     * Mostly used executing query however is a good idea to prepare query
     * again if parameter type change in an incompatible way (ie different
     * types or larger size). Is also better to prepare a query knowing
     * parameter types earlier.
     */
    TDSPARAMINFO *params;
    /** saved query, we need to know original query if prepare is impossible */
    char *query;
} /* TDSDYNAMIC */;
 
typedef enum {
    TDS_MULTIPLE_QUERY,
    TDS_MULTIPLE_EXECUTE,
    TDS_MULTIPLE_RPC
} TDS_MULTIPLE_TYPE;
 
typedef struct tds_multiple
{
    TDS_MULTIPLE_TYPE type;
    unsigned int flags;
} TDSMULTIPLE;
 
/* forward declaration */
typedef int (*err_handler_t) (const TDSCONTEXT *, TDSSOCKET *, TDSMESSAGE *);
 
struct tds_context
{
    TDSLOCALE *locale;
    void *parent;
    /* handlers */
    int (*msg_handler) (const TDSCONTEXT *, TDSSOCKET *, TDSMESSAGE *);
    int (*err_handler) (const TDSCONTEXT *, TDSSOCKET *, TDSMESSAGE *);
    int (*int_handler) (void *);
};
 
enum TDS_ICONV_ENTRY
{ 
      client2ucs2
    , client2server_chardata
    , initial_char_conv_count   /* keep last */
};
 
struct tds_authentication
{
    TDS_UCHAR *packet;
    int packet_len;
    TDSRET (*free)(TDSCONNECTION* conn, struct tds_authentication * auth);
    TDSRET (*handle_next)(TDSSOCKET * tds, struct tds_authentication * auth, size_t len);
} /* TDSAUTHENTICATION */;
 
struct tds_packet
{
    struct tds_packet *next;
    short sid;
    unsigned len, capacity;
    unsigned char buf[1];
} /* TDSPACKET */;
 
struct tds_poll_wakeup
{
    TDS_SYS_SOCKET s_signal, s_signaled;
} /* TDSPOLLWAKEUP */;
 
/* field related to connection */
struct tds_connection
{
    TDS_USMALLINT tds_version;
    TDS_UINT product_version;   /**< version of product (Sybase/MS and full version) */
    char *product_name;
 
    TDS_SYS_SOCKET s;       /**< tcp socket, INVALID_SOCKET if not connected */
    TDSPOLLWAKEUP wakeup;
    const TDSCONTEXT *tds_ctx;
 
    /** environment is shared between all sessions */
    TDSENV env;
 
    /**
     * linked list of cursors allocated for this connection
     * contains only cursors allocated on the server
     */
    TDSCURSOR *cursors;
    /**
     * list of dynamic allocated for this connection
     * contains only dynamic allocated on the server
     */
    TDSDYNAMIC *dyns;
 
    int char_conv_count;
    TDSICONV **char_convs;
 
    TDS_UCHAR collation[5];
    TDS_UCHAR tds72_transaction[8];
 
    TDS_CAPABILITIES capabilities;
    unsigned int emul_little_endian:1;
    unsigned int use_iconv:1;
    unsigned int tds71rev1:1;
    unsigned int pending_close:1;   /**< true is connection has pending closing (cursors or dynamic) */
    unsigned int encrypt_single_packet:1;
#if ENABLE_ODBC_MARS
    unsigned int mars:1;
 
    TDSSOCKET *in_net_tds;
    TDSPACKET *packets;
    TDSPACKET *recv_packet;
    TDSPACKET *send_packets;
    unsigned send_pos, recv_pos;
 
#ifdef TDS_HAVE_MUTEX
    tds_mutex list_mtx;
#endif
#define BUSY_SOCKET ((TDSSOCKET*)(TDS_UINTPTR)1)
#define TDSSOCKET_VALID(tds) (((TDS_UINTPTR)(tds)) > 1)
    struct tds_socket **sessions;
    unsigned num_sessions;
    unsigned num_cached_packets;
    TDSPACKET *packet_cache;
#endif
 
    int spid;
    int client_spid;
 
    void *tls_session;
#if defined(HAVE_GNUTLS)
    void *tls_credentials;
#elif defined(HAVE_OPENSSL)
    void *tls_ctx;
#else
    void *tls_dummy;
#endif
    TDSAUTHENTICATION *authentication;
    char *server;
};
 
/**
 * Information for a server connection
 */
struct tds_socket
{
#if ENABLE_ODBC_MARS
    TDSCONNECTION *conn;
#else
    TDSCONNECTION conn[1];
#endif
 
    /** Input buffer.
     * Points to receiving packet buffer.
     * As input buffer contains just the raw packet actually this pointer
     * is the address of recv_packet->buf.
     */
    unsigned char *in_buf;
 
    /** Output buffer.
     * Points to sending packet buffer.
     * Output buffer can contain additional data before the raw TDS packet
     * so this buffer can point some bytes after send_packet->buf.
     */
    unsigned char *out_buf;
 
    /** Maximum size of packet pointed by out_buf.
     * The buffer is actually a bit larger to make possible to do some
     * optimizations (at least TDS_ADDITIONAL_SPACE bytes).
     */
    unsigned int out_buf_max;
    unsigned in_pos;        /**< current position in in_buf */
    unsigned out_pos;       /**< current position in out_buf */
    unsigned in_len;        /**< input buffer length */
    unsigned char in_flag;      /**< input buffer type */
    unsigned char out_flag;     /**< output buffer type */
 
    void *parent;
 
#if ENABLE_ODBC_MARS
    short sid;
    tds_condition packet_cond;
    TDS_UINT recv_seq;
    TDS_UINT send_seq;
    TDS_UINT recv_wnd;
    TDS_UINT send_wnd;
#endif
    /* packet we received */
    TDSPACKET *recv_packet;
    /** packet we are preparing to send */
    TDSPACKET *send_packet;
 
    /**
     * Current query information. 
     * Contains information in process, both normal and compute results.
     * This pointer shouldn't be freed; it's just an alias to another structure.
     */
    TDSRESULTINFO *current_results;
    TDSRESULTINFO *res_info;
    TDS_UINT num_comp_info;
    TDSCOMPUTEINFO **comp_info;
    TDSPARAMINFO *param_info;
    TDSCURSOR *cur_cursor;      /**< cursor in use */
    TDS_TINYINT bulk_query;     /**< true is query sent was a bulk query so we need to switch state to QUERYING */
    TDS_TINYINT has_status;     /**< true is ret_status is valid */
    bool in_row;            /**< true if we are getting rows */
    TDS_INT ret_status;         /**< return status from store procedure */
    TDS_STATE state;
    volatile 
    unsigned char in_cancel;    /**< indicate we are waiting a cancel reply; discard tokens till acknowledge; 
    1 mean we have to send cancel packet, 2 already sent. */
 
    TDS_INT8 rows_affected;     /**< rows updated/deleted/inserted/selected, TDS_NO_COUNT if not valid */
    TDS_INT query_timeout;
 
    TDSDYNAMIC *cur_dyn;        /**< dynamic structure in use */
 
    TDSLOGIN *login;    /**< config for login stuff. After login this field is NULL */
 
    void (*env_chg_func) (TDSSOCKET * tds, int type, char *oldval, char *newval);
    TDS_OPERATION current_op;
 
    int option_value;
#ifdef TDS_HAVE_MUTEX
    tds_mutex wire_mtx;
#endif
};
 
#define tds_get_ctx(tds) ((tds)->conn->tds_ctx)
#define tds_set_ctx(tds, val) do { ((tds)->conn->tds_ctx) = (val); } while(0)
#define tds_get_parent(tds) ((tds)->parent)
#define tds_set_parent(tds, val) do { ((tds)->parent) = (val); } while(0)
#define tds_get_s(tds) ((tds)->conn->s)
#define tds_set_s(tds, val) do { ((tds)->conn->s) = (val); } while(0)
 
 
/* config.c */
const TDS_COMPILETIME_SETTINGS *tds_get_compiletime_settings(void);
typedef void (*TDSCONFPARSE) (const char *option, const char *value, void *param);
int tds_read_conf_section(FILE * in, const char *section, TDSCONFPARSE tds_conf_parse, void *parse_param);
int tds_read_conf_file(TDSLOGIN * login, const char *server);
void tds_parse_conf_section(const char *option, const char *value, void *param);
TDSLOGIN *tds_read_config_info(TDSSOCKET * tds, TDSLOGIN * login, TDSLOCALE * locale);
void tds_fix_login(TDSLOGIN* login);
TDS_USMALLINT * tds_config_verstr(const char *tdsver, TDSLOGIN* login);
struct addrinfo *tds_lookup_host(const char *servername);
TDSRET tds_lookup_host_set(const char *servername, struct addrinfo **addr);
const char *tds_addrinfo2str(struct addrinfo *addr, char *name, int namemax);
 
TDSRET tds_set_interfaces_file_loc(const char *interfloc);
extern const char STD_DATETIME_FMT[];
int tds_parse_boolean(const char *value, int default_value);
int tds_config_boolean(const char *option, const char *value, TDSLOGIN * login);
 
TDSLOCALE *tds_get_locale(void);
TDSRET tds_alloc_row(TDSRESULTINFO * res_info);
TDSRET tds_alloc_compute_row(TDSCOMPUTEINFO * res_info);
BCPCOLDATA * tds_alloc_bcp_column_data(unsigned int column_size);
TDSDYNAMIC *tds_lookup_dynamic(TDSCONNECTION * conn, const char *id);
/*@observer@*/ const char *tds_prtype(int token);
int tds_get_varint_size(TDSCONNECTION * conn, int datatype);
TDS_SERVER_TYPE tds_get_cardinal_type(TDS_SERVER_TYPE datatype, int usertype);
 
 
/* iconv.c */
TDSRET tds_iconv_open(TDSCONNECTION * conn, const char *charset, int use_utf16);
void tds_iconv_close(TDSCONNECTION * conn);
void tds_srv_charset_changed(TDSCONNECTION * conn, const char *charset);
void tds7_srv_charset_changed(TDSCONNECTION * conn, int sql_collate, int lcid);
int tds_iconv_alloc(TDSCONNECTION * conn);
void tds_iconv_free(TDSCONNECTION * conn);
TDSICONV *tds_iconv_from_collate(TDSCONNECTION * conn, TDS_UCHAR collate[5]);
 
 
/* threadsafe.c */
char *tds_timestamp_str(char *str, int maxlen);
struct tm *tds_localtime_r(const time_t *timep, struct tm *result);
struct hostent *tds_gethostbyname_r(const char *servername, struct hostent *result, char *buffer, int buflen, int *h_errnop);
int tds_getservice(const char *name);
char *tds_get_homedir(void);
 
 
/* mem.c */
void tds_free_socket(TDSSOCKET * tds);
void tds_free_all_results(TDSSOCKET * tds);
void tds_free_results(TDSRESULTINFO * res_info);
void tds_free_param_results(TDSPARAMINFO * param_info);
void tds_free_param_result(TDSPARAMINFO * param_info);
void tds_free_msg(TDSMESSAGE * message);
void tds_cursor_deallocated(TDSCONNECTION *conn, TDSCURSOR *cursor);
void tds_release_cursor(TDSCURSOR **pcursor);
void tds_free_bcp_column_data(BCPCOLDATA * coldata);
TDSRESULTINFO *tds_alloc_results(TDS_USMALLINT num_cols);
TDSCOMPUTEINFO **tds_alloc_compute_results(TDSSOCKET * tds, TDS_USMALLINT num_cols, TDS_USMALLINT by_cols);
TDSCONTEXT *tds_alloc_context(void * parent);
void tds_free_context(TDSCONTEXT * locale);
TDSPARAMINFO *tds_alloc_param_result(TDSPARAMINFO * old_param);
void tds_free_input_params(TDSDYNAMIC * dyn);
void tds_release_dynamic(TDSDYNAMIC ** dyn);
static inline
void tds_release_cur_dyn(TDSSOCKET * tds)
{
    tds_release_dynamic(&tds->cur_dyn);
}
void tds_dynamic_deallocated(TDSCONNECTION *conn, TDSDYNAMIC *dyn);
void tds_set_cur_dyn(TDSSOCKET *tds, TDSDYNAMIC *dyn);
TDSSOCKET *tds_realloc_socket(TDSSOCKET * tds, unsigned int bufsize);
char *tds_alloc_client_sqlstate(int msgno);
char *tds_alloc_lookup_sqlstate(TDSSOCKET * tds, int msgno);
TDSLOGIN *tds_alloc_login(int use_environment);
TDSDYNAMIC *tds_alloc_dynamic(TDSCONNECTION * conn, const char *id);
void tds_free_login(TDSLOGIN * login);
TDSLOGIN *tds_init_login(TDSLOGIN * login, TDSLOCALE * locale);
TDSLOCALE *tds_alloc_locale(void);
void *tds_alloc_param_data(TDSCOLUMN * curparam);
void tds_free_locale(TDSLOCALE * locale);
TDSCURSOR * tds_alloc_cursor(TDSSOCKET * tds, const char *name, size_t namelen,
                             const char *query, size_t querylen);
void tds_free_row(TDSRESULTINFO * res_info, unsigned char *row);
TDSSOCKET *tds_alloc_socket(TDSCONTEXT * context, unsigned int bufsize);
TDSSOCKET *tds_alloc_additional_socket(TDSCONNECTION *conn);
void tds_set_current_results(TDSSOCKET *tds, TDSRESULTINFO *info);
void tds_detach_results(TDSRESULTINFO *info);
void * tds_realloc(void **pp, size_t new_size);
#define TDS_RESIZE(p, n_elem) \
    tds_realloc((void **) &(p), sizeof(*(p)) * (size_t) (n_elem))
#define tds_new(type, n) ((type *) malloc(sizeof(type) * (n)))
#define tds_new0(type, n) ((type *) calloc(n, sizeof(type)))
 
TDSPACKET *tds_alloc_packet(void *buf, unsigned len);
TDSPACKET *tds_realloc_packet(TDSPACKET *packet, unsigned len);
void tds_free_packets(TDSPACKET *packet);
TDSBCPINFO *tds_alloc_bcpinfo(void);
void tds_free_bcpinfo(TDSBCPINFO *bcpinfo);
void tds_deinit_bcpinfo(TDSBCPINFO *bcpinfo);
 
 
/* login.c */
void tds_set_packet(TDSLOGIN * tds_login, int packet_size);
void tds_set_port(TDSLOGIN * tds_login, int port);
bool tds_set_passwd(TDSLOGIN * tds_login, const char *password) TDS_WUR;
void tds_set_bulk(TDSLOGIN * tds_login, TDS_TINYINT enabled);
bool tds_set_user(TDSLOGIN * tds_login, const char *username) TDS_WUR;
bool tds_set_app(TDSLOGIN * tds_login, const char *application) TDS_WUR;
bool tds_set_host(TDSLOGIN * tds_login, const char *hostname) TDS_WUR;
bool tds_set_library(TDSLOGIN * tds_login, const char *library) TDS_WUR;
bool tds_set_server(TDSLOGIN * tds_login, const char *server) TDS_WUR;
bool tds_set_client_charset(TDSLOGIN * tds_login, const char *charset) TDS_WUR;
bool tds_set_language(TDSLOGIN * tds_login, const char *language) TDS_WUR;
void tds_set_version(TDSLOGIN * tds_login, TDS_TINYINT major_ver, TDS_TINYINT minor_ver);
int tds_connect_and_login(TDSSOCKET * tds, TDSLOGIN * login);
 
 
/* query.c */
void tds_start_query(TDSSOCKET *tds, unsigned char packet_type);
 
TDSRET tds_submit_query(TDSSOCKET * tds, const char *query);
TDSRET tds_submit_query_params(TDSSOCKET * tds, const char *query, TDSPARAMINFO * params, TDSHEADERS * head);
TDSRET tds_submit_queryf(TDSSOCKET * tds, const char *queryf, ...);
TDSRET tds_submit_prepare(TDSSOCKET * tds, const char *query, const char *id, TDSDYNAMIC ** dyn_out, TDSPARAMINFO * params);
TDSRET tds_submit_execdirect(TDSSOCKET * tds, const char *query, TDSPARAMINFO * params, TDSHEADERS * head);
TDSRET tds71_submit_prepexec(TDSSOCKET * tds, const char *query, const char *id, TDSDYNAMIC ** dyn_out, TDSPARAMINFO * params);
TDSRET tds_submit_execute(TDSSOCKET * tds, TDSDYNAMIC * dyn);
TDSRET tds_send_cancel(TDSSOCKET * tds);
const char *tds_next_placeholder(const char *start);
int tds_count_placeholders(const char *query);
int tds_needs_unprepare(TDSCONNECTION * conn, TDSDYNAMIC * dyn);
TDSRET tds_deferred_unprepare(TDSCONNECTION * conn, TDSDYNAMIC * dyn);
TDSRET tds_submit_unprepare(TDSSOCKET * tds, TDSDYNAMIC * dyn);
TDSRET tds_submit_rpc(TDSSOCKET * tds, const char *rpc_name, TDSPARAMINFO * params, TDSHEADERS * head);
TDSRET tds_submit_optioncmd(TDSSOCKET * tds, TDS_OPTION_CMD command, TDS_OPTION option, TDS_OPTION_ARG *param, TDS_INT param_size);
TDSRET tds_submit_begin_tran(TDSSOCKET *tds);
TDSRET tds_submit_rollback(TDSSOCKET *tds, int cont);
TDSRET tds_submit_commit(TDSSOCKET *tds, int cont);
TDSRET tds_disconnect(TDSSOCKET * tds);
size_t tds_quote_id(TDSSOCKET * tds, char *buffer, const char *id,
                    ssize_t idlen);
size_t tds_quote_string(TDSSOCKET * tds, char *buffer, const char *str,
                        ssize_t len);
const char *tds_skip_comment(const char *s);
const char *tds_skip_quoted(const char *s);
size_t tds_fix_column_size(TDSSOCKET * tds, TDSCOLUMN * curcol);
const char *tds_convert_string(TDSSOCKET * tds, TDSICONV * char_conv,
                               const char *s, ssize_t len, size_t *out_len);
void tds_convert_string_free(const char *original, const char *converted);
#if !ENABLE_EXTRA_CHECKS
#define tds_convert_string_free(original, converted) \
    do { if (original != converted) free((char*) converted); } while(0)
#endif
TDSRET tds_get_column_declaration(TDSSOCKET * tds, TDSCOLUMN * curcol, char *out);
 
TDSRET tds_cursor_declare(TDSSOCKET * tds, TDSCURSOR * cursor, TDSPARAMINFO *params, int *send);
TDSRET tds_cursor_setrows(TDSSOCKET * tds, TDSCURSOR * cursor, int *send);
TDSRET tds_cursor_open(TDSSOCKET * tds, TDSCURSOR * cursor, TDSPARAMINFO *params, int *send);
TDSRET tds_cursor_fetch(TDSSOCKET * tds, TDSCURSOR * cursor, TDS_CURSOR_FETCH fetch_type, TDS_INT i_row);
TDSRET tds_cursor_get_cursor_info(TDSSOCKET * tds, TDSCURSOR * cursor, TDS_UINT * row_number, TDS_UINT * row_count);
TDSRET tds_cursor_close(TDSSOCKET * tds, TDSCURSOR * cursor);
TDSRET tds_cursor_dealloc(TDSSOCKET * tds, TDSCURSOR * cursor);
TDSRET tds_deferred_cursor_dealloc(TDSCONNECTION *conn, TDSCURSOR * cursor);
TDSRET tds_cursor_update(TDSSOCKET * tds, TDSCURSOR * cursor, TDS_CURSOR_OPERATION op, TDS_INT i_row, TDSPARAMINFO * params);
TDSRET tds_cursor_setname(TDSSOCKET * tds, TDSCURSOR * cursor);
 
TDSRET tds_multiple_init(TDSSOCKET *tds, TDSMULTIPLE *multiple, TDS_MULTIPLE_TYPE type, TDSHEADERS * head);
TDSRET tds_multiple_done(TDSSOCKET *tds, TDSMULTIPLE *multiple);
TDSRET tds_multiple_query(TDSSOCKET *tds, TDSMULTIPLE *multiple, const char *query, TDSPARAMINFO * params);
TDSRET tds_multiple_execute(TDSSOCKET *tds, TDSMULTIPLE *multiple, TDSDYNAMIC * dyn);
 
 
/* token.c */
TDSRET tds_process_cancel(TDSSOCKET * tds);
int tds_get_token_size(int marker);
TDSRET tds_process_login_tokens(TDSSOCKET * tds);
TDSRET tds_process_simple_query(TDSSOCKET * tds);
int tds5_send_optioncmd(TDSSOCKET * tds, TDS_OPTION_CMD tds_command, TDS_OPTION tds_option, TDS_OPTION_ARG * tds_argument,
            TDS_INT * tds_argsize);
TDSRET tds_process_tokens(TDSSOCKET * tds, /*@out@*/ TDS_INT * result_type, /*@out@*/ int *done_flags, unsigned flag);
int determine_adjusted_size(const TDSICONV * char_conv, int size);
 
 
/* data.c */
void tds_set_param_type(TDSCONNECTION * conn, TDSCOLUMN * curcol, TDS_SERVER_TYPE type);
void tds_set_column_type(TDSCONNECTION * conn, TDSCOLUMN * curcol, TDS_SERVER_TYPE type);
 
 
/* tds_convert.c */
TDSRET tds_datecrack(TDS_INT datetype, const void *di, TDSDATEREC * dr);
TDS_SERVER_TYPE tds_get_conversion_type(TDS_SERVER_TYPE srctype, int colsize);
extern const char tds_hex_digits[];
 
 
/* write.c */
int tds_init_write_buf(TDSSOCKET * tds);
int tds_put_n(TDSSOCKET * tds, const void *buf, size_t n);
int tds_put_string(TDSSOCKET * tds, const char *buf, int len);
int tds_put_int(TDSSOCKET * tds, TDS_INT i);
int tds_put_int8(TDSSOCKET * tds, TDS_INT8 i);
int tds_put_smallint(TDSSOCKET * tds, TDS_SMALLINT si);
/** Output a tinyint value */
#define tds_put_tinyint(tds, ti) tds_put_byte(tds,ti)
int tds_put_byte(TDSSOCKET * tds, unsigned char c);
TDSRET tds_flush_packet(TDSSOCKET * tds);
int tds_put_buf(TDSSOCKET * tds, const unsigned char *buf, int dsize, int ssize);
 
 
/* read.c */
unsigned char tds_get_byte(TDSSOCKET * tds);
void tds_unget_byte(TDSSOCKET * tds);
unsigned char tds_peek(TDSSOCKET * tds);
TDS_USMALLINT tds_get_usmallint(TDSSOCKET * tds);
#define tds_get_smallint(tds) ((TDS_SMALLINT) tds_get_usmallint(tds))
TDS_UINT tds_get_uint(TDSSOCKET * tds);
#define tds_get_int(tds) ((TDS_INT) tds_get_uint(tds))
TDS_UINT8 tds_get_uint8(TDSSOCKET * tds);
#define tds_get_int8(tds) ((TDS_INT8) tds_get_uint8(tds))
size_t tds_get_string(TDSSOCKET * tds, size_t string_len, char *dest, size_t dest_size);
TDSRET tds_get_char_data(TDSSOCKET * tds, char *dest, size_t wire_size, TDSCOLUMN * curcol);
void *tds_get_n(TDSSOCKET * tds, /*@out@*/ /*@null@*/ void *dest, size_t n);
int tds_get_size_by_type(TDS_SERVER_TYPE servertype);
DSTR* tds_dstr_get(TDSSOCKET * tds, DSTR * s, size_t len);
 
 
/* util.c */
int tdserror (const TDSCONTEXT * tds_ctx, TDSSOCKET * tds, int msgno, int errnum);
TDS_STATE tds_set_state(TDSSOCKET * tds, TDS_STATE state);
void tds_swap_bytes(void *buf, int bytes);
#ifdef ENABLE_DEVELOPING
unsigned int tds_gettime_ms(void);
#endif
char *tds_strndup(const void *s, TDS_INTPTR len);
 
 
/* log.c */
void tdsdump_off(void);
void tdsdump_on(void);
int tdsdump_state(void);
int tdsdump_isopen(void);
#include <freetds/popvis.h>
int tdsdump_open(const char *filename);
#include <freetds/pushvis.h>
void tdsdump_close(void);
void tdsdump_do_dump_buf(const char* file, unsigned int level_line,
                         const char *msg, const void *buf, size_t length);
void tdsdump_col(const TDSCOLUMN *col);
void tdsdump_do_log(const char* file, unsigned int level_line,
                    const char *fmt, ...)
#if defined(__GNUC__) && __GNUC__ >= 2
#if defined(__MINGW32__)
    __attribute__ ((__format__ (ms_printf, 3, 4)))
#else
    __attribute__ ((__format__ (__printf__, 3, 4)))
#endif
#endif
;
#define TDSDUMP_LOG_FAST \
    if (TDS_UNLIKELY(tds_write_dump && !tdsdump_elided)) tdsdump_do_log
#define tdsdump_log TDSDUMP_LOG_FAST
#define TDSDUMP_BUF_FAST \
    if (TDS_UNLIKELY(tds_write_dump && !tdsdump_elided)) tdsdump_do_dump_buf
#define tdsdump_dump_buf TDSDUMP_BUF_FAST
 
extern int tds_write_dump;
extern int tds_debug_flags;
extern int tds_g_append_mode;
extern
#ifdef NCBI_TLS_VAR
NCBI_TLS_VAR
#endif
int tdsdump_elided;
 
 
/* net.c */
TDSERRNO tds_open_socket(TDSSOCKET * tds, struct addrinfo *ipaddr, unsigned int port, int timeout, int *p_oserr);
void tds_close_socket(TDSSOCKET * tds);
int tds7_get_instance_ports(FILE *output, struct addrinfo *addr);
int tds7_get_instance_port(struct addrinfo *addr, const char *instance);
char *tds_prwsaerror(int erc);
void tds_prwsaerror_free(char *s);
ssize_t tds_connection_read(TDSSOCKET * tds, unsigned char *buf,
                            size_t buflen);
ssize_t tds_connection_write(TDSSOCKET *tds, const unsigned char *buf,
                             size_t buflen, int final);
#define TDSSELREAD  POLLIN
#define TDSSELWRITE POLLOUT
int tds_select(TDSSOCKET * tds, unsigned tds_sel, int timeout_seconds);
void tds_connection_close(TDSCONNECTION *conn);
ssize_t tds_goodread(TDSSOCKET * tds, unsigned char *buf, size_t buflen);
ssize_t tds_goodwrite(TDSSOCKET * tds, const unsigned char *buffer,
                      size_t buflen);
void tds_socket_flush(TDS_SYS_SOCKET sock);
int tds_socket_set_nonblocking(TDS_SYS_SOCKET sock);
int tds_wakeup_init(TDSPOLLWAKEUP *wakeup);
void tds_wakeup_close(TDSPOLLWAKEUP *wakeup);
void tds_wakeup_send(TDSPOLLWAKEUP *wakeup, char cancel);
static inline TDS_SYS_SOCKET tds_wakeup_get_fd(const TDSPOLLWAKEUP *wakeup)
{
    return wakeup->s_signaled;
}
 
 
/* packet.c */
int tds_read_packet(TDSSOCKET * tds);
TDSRET tds_write_packet(TDSSOCKET * tds, unsigned char final);
#if ENABLE_ODBC_MARS
int tds_append_cancel(TDSSOCKET *tds);
TDSRET tds_append_fin(TDSSOCKET *tds);
#else
int tds_put_cancel(TDSSOCKET * tds);
#endif
 
 
/* vstrbuild.c */
TDSRET tds_vstrbuild(char *buffer, int buflen, int *resultlen, const char *text, int textlen, const char *formats, int formatlen,
          va_list ap);
 
 
/* numeric.c */
char *tds_money_to_string(const TDS_MONEY * money, char *s);
TDS_INT tds_numeric_to_string(const TDS_NUMERIC * numeric, char *s);
TDS_INT tds_numeric_change_prec_scale(TDS_NUMERIC * numeric, unsigned char new_prec, unsigned char new_scale);
 
 
/* getmac.c */
void tds_getmac(TDS_SYS_SOCKET s, unsigned char mac[6]);
 
 
/* challenge.c */
#ifndef HAVE_SSPI
TDSAUTHENTICATION * tds_ntlm_get_auth(TDSSOCKET * tds);
TDSAUTHENTICATION * tds_gss_get_auth(TDSSOCKET * tds);
#else
TDSAUTHENTICATION * tds_sspi_get_auth(TDSSOCKET * tds);
#endif
 
 
/* random.c */
void tds_random_buffer(unsigned char *out, int len);
 
 
/* sec_negotiate.c */
TDSAUTHENTICATION * tds5_negotiate_get_auth(TDSSOCKET * tds);
void tds5_negotiate_set_msg_type(TDSSOCKET * tds, TDSAUTHENTICATION * auth, unsigned msg_type);
 
 
/* bulk.c */
 
/** bcp direction */
enum tds_bcp_directions
{
    TDS_BCP_IN = 1,
    TDS_BCP_OUT = 2,
    TDS_BCP_QUERYOUT = 3
};
 
struct tds_bcpinfo
{
    const char *hint;
    void *parent;
    DSTR tablename;
    TDS_CHAR *insert_stmt;
    TDS_INT direction;
    TDS_INT identity_insert_on;
    TDS_INT xfer_init;
    TDS_INT bind_count;
    TDSRESULTINFO *bindinfo;
        TDS_INT text_sent;
        TDS_INT next_col;
        TDS_INT blob_cols;
};
 
TDSRET tds_bcp_init(TDSSOCKET *tds, TDSBCPINFO *bcpinfo);
typedef TDSRET (*tds_bcp_get_col_data) (TDSBCPINFO *bulk, TDSCOLUMN *bcpcol, int offset);
typedef void (*tds_bcp_null_error)   (TDSBCPINFO *bulk, int index, int offset);
TDSRET tds_bcp_send_record(TDSSOCKET *tds, TDSBCPINFO *bcpinfo, tds_bcp_get_col_data get_col_data, tds_bcp_null_error null_error, int offset);
TDSRET tds_bcp_done(TDSSOCKET *tds, int *rows_copied);
TDSRET tds_bcp_start(TDSSOCKET *tds, TDSBCPINFO *bcpinfo);
TDSRET tds_bcp_start_copy_in(TDSSOCKET *tds, TDSBCPINFO *bcpinfo);
 
TDSRET tds_bcp_fread(TDSSOCKET * tds, TDSICONV * conv, FILE * stream,
             const char *terminator, size_t term_len, char **outbuf, size_t * outbytes);
 
TDSRET tds_writetext_start(TDSSOCKET *tds, const char *objname, const char *textptr, const char *timestamp, int with_log, TDS_UINT size);
TDSRET tds_writetext_continue(TDSSOCKET *tds, const TDS_UCHAR *text, TDS_UINT size);
TDSRET tds_writetext_end(TDSSOCKET *tds);
 
 
static inline
bool tds_capability_enabled(const TDS_CAPABILITY_TYPE *cap, unsigned cap_num)
{
    return (cap->values[sizeof(cap->values)-1-(cap_num>>3)] >> (cap_num&7)) & 1;
}
#define tds_capability_has_req(conn, cap) \
    tds_capability_enabled(&conn->capabilities.types[0], cap)
 
#define IS_TDS42(x) (x->tds_version==0x402)
#define IS_TDS46(x) (x->tds_version==0x406)
#define IS_TDS50(x) (x->tds_version==0x500)
#define IS_TDS70(x) (x->tds_version==0x700)
#define IS_TDS71(x) (x->tds_version==0x701)
#define IS_TDS72(x) (x->tds_version==0x702)
#define IS_TDS73(x) (x->tds_version==0x703)
 
#define IS_TDS50_PLUS(x) ((x)->tds_version>=0x500)
#define IS_TDS7_PLUS(x)  ((x)->tds_version>=0x700)
#define IS_TDS71_PLUS(x) ((x)->tds_version>=0x701)
#define IS_TDS72_PLUS(x) ((x)->tds_version>=0x702)
#define IS_TDS73_PLUS(x) ((x)->tds_version>=0x703)
#define IS_TDS74_PLUS(x) ((x)->tds_version>=0x704)
 
#define TDS_MAJOR(x) ((x)->tds_version >> 8)
#define TDS_MINOR(x) ((x)->tds_version & 0xff)
 
#define IS_TDSDEAD(x) (((x) == NULL) || (x)->state == TDS_DEAD)
 
/** Check if product is Sybase (such as Adaptive Server Enterrprice). x should be a TDSSOCKET*. */
#define TDS_IS_SYBASE(x) (!((x)->conn->product_version & 0x80000000u))
/** Check if product is Microsft SQL Server. x should be a TDSSOCKET*. */
#define TDS_IS_MSSQL(x) (((x)->conn->product_version & 0x80000000u)!=0)
 
/** Calc a version number for mssql. Use with TDS_MS_VER(7,0,842).
 * For test for a range of version you can use check like
 * if (tds->product_version >= TDS_MS_VER(7,0,0) && tds->product_version < TDS_MS_VER(8,0,0)) */
#define TDS_MS_VER(maj,min,x) (0x80000000u|((maj)<<24)|((min)<<16)|(x))
 
/* TODO test if not similar to ms one*/
/** Calc a version number for Sybase. */
#define TDS_SYB_VER(maj,min,x) (((maj)<<24)|((min)<<16)|(x)<<8)
 
#ifdef __cplusplus
#if 0
{
#endif
}
#endif
 
#include <freetds/popvis.h>
 
#define TDS_PUT_INT(tds,v) tds_put_int((tds), ((TDS_INT)(v)))
#define TDS_PUT_SMALLINT(tds,v) tds_put_smallint((tds), ((TDS_SMALLINT)(v)))
#define TDS_PUT_BYTE(tds,v) tds_put_byte((tds), ((unsigned char)(v)))
 
#endif /* _tds_h_ */