/*  dos.h

    Defines structs, unions, macros, and functions for dealing
    with MSDOS and the Intel iAPX86 microprocessor family.

    Copyright (c) 1987, 1991 by Borland International
    All Rights Reserved.
*/
#ifndef __DOS_H
#define __DOS_H

#if !defined( __DEFS_H )
#include <_defs.h>
#endif

extern  int _Cdecl  errno;
extern  int _Cdecl  _doserrno;

/* Variables */
extern  int const _Cdecl _8087;
extern  int       _Cdecl _argc;
extern  char    **_Cdecl _argv;
extern  char    **_Cdecl  environ;

extern  unsigned      _Cdecl _psp;
extern  unsigned      _Cdecl _heaplen;
extern  unsigned char _Cdecl _osmajor;
extern  unsigned char _Cdecl _osminor;
extern  unsigned      _Cdecl _stklen;
extern  unsigned      _Cdecl _fpstklen;
extern  unsigned      _Cdecl _version;
extern  unsigned      _Cdecl _osversion;      /* MSC name for _version */

#define FA_NORMAL   0x00        /* Normal file, no attributes */
#define FA_RDONLY   0x01        /* Read only attribute */
#define FA_HIDDEN   0x02        /* Hidden file */
#define FA_SYSTEM   0x04        /* System file */
#define FA_LABEL    0x08        /* Volume label */
#define FA_DIREC    0x10        /* Directory */
#define FA_ARCH     0x20        /* Archive */

/* MSC names for file attributes */

#define _A_NORMAL   0x00        /* Normal file, no attributes */
#define _A_RDONLY   0x01        /* Read only attribute */
#define _A_HIDDEN   0x02        /* Hidden file */
#define _A_SYSTEM   0x04        /* System file */
#define _A_VOLID    0x08        /* Volume label */
#define _A_SUBDIR   0x10        /* Directory */
#define _A_ARCH     0x20        /* Archive */

#define NFDS    20          /* Maximum number of fds */

struct  fcb {
    char    fcb_drive;      /* 0 = default, 1 = A, 2 = B */
    char    fcb_name[8];    /* File name */
    char    fcb_ext[3];     /* File extension */
    short   fcb_curblk;     /* Current block number */
    short   fcb_recsize;    /* Logical record size in bytes */
    long    fcb_filsize;    /* File size in bytes */
    short   fcb_date;       /* Date file was last written */
    char    fcb_resv[10];   /* Reserved for DOS */
    char    fcb_currec;     /* Current record in block */
    long    fcb_random;     /* Random record number */
};

struct  xfcb    {
    char        xfcb_flag;  /* Contains 0xff to indicate xfcb */
    char        xfcb_resv[5];/* Reserved for DOS */
    char        xfcb_attr;  /* Search attribute */
    struct  fcb xfcb_fcb;   /* The standard fcb */
};

struct  COUNTRY {
    int co_date;
    char    co_curr[5];
    char    co_thsep[2];
    char    co_desep[2];
    char    co_dtsep[2];
    char    co_tmsep[2];
    char    co_currstyle;
    char    co_digits;
    char    co_time;
    long    co_case;
    char    co_dasep[2];
    char    co_fill[10];
};

#if defined(__MSC) && !defined(__cplusplus)
struct  DOSERROR {
        int     exterror;
        char    class;
        char    action;
        char    locus;
};
#else
struct  DOSERROR {
        int     de_exterror;
        char    de_class;
        char    de_action;
        char    de_locus;
};
#endif  /* __MSC and not C++ */

struct  dfree   {
    unsigned df_avail;
    unsigned df_total;
    unsigned df_bsec;
    unsigned df_sclus;
};

struct diskfree_t {
    unsigned total_clusters;
    unsigned avail_clusters;
    unsigned sectors_per_cluster;
    unsigned bytes_per_sector;
};

struct  fatinfo {
    char     fi_sclus;
    char     fi_fatid;
    unsigned fi_nclus;
    int      fi_bysec;
};

struct  devhdr  {
    long        dh_next;        /* Next device pointer */
    short       dh_attr;        /* Attributes */
    unsigned short  dh_strat;   /* Driver strategy routine */
    unsigned short  dh_inter;   /* Driver interrupt routine */
    char        dh_name[8];     /* Device name */
};

struct  time    {
    unsigned char   ti_min;     /* Minutes */
    unsigned char   ti_hour;    /* Hours */
    unsigned char   ti_hund;    /* Hundredths of seconds */
    unsigned char   ti_sec;     /* Seconds */
};

struct dostime_t {
    unsigned char hour;         /* Hours */
    unsigned char minute;       /* Minutes */
    unsigned char second;       /* Seconds */
    unsigned char hsecond;      /* Hundredths of seconds */
};

struct  date    {
    int     da_year;        /* Year - 1980 */
    char        da_day;     /* Day of the month */
    char        da_mon;     /* Month (1 = Jan) */
};

struct dosdate_t {
    unsigned char day;      /* 1-31 */
    unsigned char month;    /* 1-12 */
    unsigned int  year;     /* 1980 - 2099 */
    unsigned char dayofweek;/* 0 - 6 (0=Sunday) */
};

#ifndef _REG_DEFS
#define _REG_DEFS

struct WORDREGS {
    unsigned int    ax, bx, cx, dx, si, di, cflag, flags;
};

struct BYTEREGS {
    unsigned char   al, ah, bl, bh, cl, ch, dl, dh;
};

union   REGS    {
    struct  WORDREGS x;
    struct  BYTEREGS h;
};

struct  SREGS   {
    unsigned int    es;
    unsigned int    cs;
    unsigned int    ss;
    unsigned int    ds;
};

struct  REGPACK {
    unsigned    r_ax, r_bx, r_cx, r_dx;
    unsigned    r_bp, r_si, r_di, r_ds, r_es, r_flags;
};

#endif  /* _REG_DEFS */

typedef struct {
    char    ds_drive;          /* do not change    */
    char    ds_pattern [13];   /*  these fields,       */
    char    ds_reserved [7];   /*   Microsoft reserved */
    char    ds_attrib;
    short   ds_time;
    short   ds_date;
    long    ds_size;
    char    ds_nameZ [13];     /* result of the search, asciiz */
}   dosSearchInfo;  /* used with DOS functions 4E, 4F   */


#ifndef _FFBLK_DEF
#define _FFBLK_DEF
struct  ffblk   {
    char        ff_reserved[21];
    char        ff_attrib;
    unsigned    ff_ftime;
    unsigned    ff_fdate;
    long        ff_fsize;
    char        ff_name[13];
};
#endif  /* _FFBLK_DEF */

/* The MSC find_t structure corresponds exactly to the ffblk structure */
struct find_t {
    char     reserved[21];      /* Microsoft reserved - do not change */
    char     attrib;            /* attribute byte for matched file */
    unsigned wr_time;           /* time of last write to file */
    unsigned wr_date;           /* date of last write to file */
    long     size;              /* size of file */
    char     name[13];          /* asciiz name of matched file */
};

/* axret values for _hardresume() */

#define _HARDERR_IGNORE 0   /* ignore error */
#define _HARDERR_RETRY  1   /* retry the operation */
#define _HARDERR_ABORT  2   /* abort program */
#define _HARDERR_FAIL   3   /* fail the operation */

#define SEEK_CUR    1
#define SEEK_END    2
#define SEEK_SET    0