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/***
*dos.h - definitions for MS-DOS interface routines
*
* Copyright (c) 1985-1988, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Defines the structs and unions used for the direct DOS interface
* routines; includes macros to access the segment and offset
* values of far pointers, so that they may be used by the routines; and
* provides function prototypes for direct DOS interface functions.
*
*******************************************************************************/
#ifndef NO_EXT_KEYS /* extensions enabled */
#define _CDECL cdecl
#define _NEAR near
#else /* extensions not enabled */
#define _CDECL
#define _NEAR
#endif /* NO_EXT_KEYS */
#ifndef _REGS_DEFINED
/* word registers */
struct WORDREGS {
unsigned int ax;
unsigned int bx;
unsigned int cx;
unsigned int dx;
unsigned int si;
unsigned int di;
unsigned int cflag;
};
/* byte registers */
struct BYTEREGS {
unsigned char al, ah;
unsigned char bl, bh;
unsigned char cl, ch;
unsigned char dl, dh;
};
/* general purpose registers union -
* overlays the corresponding word and byte registers.
*/
union REGS {
struct WORDREGS x;
struct BYTEREGS h;
};
/* segment registers */
struct SREGS {
unsigned int es;
unsigned int cs;
unsigned int ss;
unsigned int ds;
};
#define _REGS_DEFINED
#endif
/* dosexterror structure */
#ifndef _DOSERROR_DEFINED
struct DOSERROR {
int exterror;
char class;
char action;
char locus;
};
#define _DOSERROR_DEFINED
#endif
/* _dos_findfirst structure */
#ifndef _FIND_T_DEFINED
struct find_t {
char reserved[21];
char attrib;
unsigned wr_time;
unsigned wr_date;
long size;
char name[13];
};
#define _FIND_T_DEFINED
#endif
/* _dos_getdate/_dossetdate and _dos_gettime/_dos_settime structures */
#ifndef _DATETIME_T_DEFINED
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 */
};
struct dostime_t {
unsigned char hour; /* 0-23 */
unsigned char minute; /* 0-59 */
unsigned char second; /* 0-59 */
unsigned char hsecond; /* 0-99 */
};
#define _DATETIME_T_DEFINED
#endif
/* _dos_getdiskfree structure */
#ifndef _DISKFREE_T_DEFINED
struct diskfree_t {
unsigned total_clusters;
unsigned avail_clusters;
unsigned sectors_per_cluster;
unsigned bytes_per_sector;
};
#define _DISKFREE_T_DEFINED
#endif
/* manifest constants for _hardresume result parameter */
#define _HARDERR_IGNORE 0 /* Ignore the error */
#define _HARDERR_RETRY 1 /* Retry the operation */
#define _HARDERR_ABORT 2 /* Abort program issuing Interrupt 23h */
#define _HARDERR_FAIL 3 /* Fail the system call in progress */
/* _HARDERR_FAIL is not supported on DOS 2.x */
/* File attribute constants */
#define _A_NORMAL 0x00 /* Normal file - No read/write restrictions */
#define _A_RDONLY 0x01 /* Read only file */
#define _A_HIDDEN 0x02 /* Hidden file */
#define _A_SYSTEM 0x04 /* System file */
#define _A_VOLID 0x08 /* Volume ID file */
#define _A_SUBDIR 0x10 /* Subdirectory */
#define _A_ARCH 0x20 /* Archive file */
/* macros to break MS C "far" pointers into their segment and offset
* components
*/
#define FP_SEG(fp) (*((unsigned *)&(fp) + 1))
#define FP_OFF(fp) (*((unsigned *)&(fp)))
/* external variable declarations */
extern unsigned int _NEAR _CDECL _osversion;
/* function prototypes */
int _CDECL bdos(int, unsigned int, unsigned int);
void _CDECL _disable(void);
unsigned _CDECL _dos_allocmem(unsigned, unsigned *);
unsigned _CDECL _dos_close(int);
unsigned _CDECL _dos_creat(char *, unsigned, int *);
unsigned _CDECL _dos_creatnew(char *, unsigned, int *);
unsigned _CDECL _dos_findfirst(char *, unsigned, struct find_t *);
unsigned _CDECL _dos_findnext(struct find_t *);
unsigned _CDECL _dos_freemem(unsigned);
void _CDECL _dos_getdate(struct dosdate_t *);
void _CDECL _dos_getdrive(unsigned *);
unsigned _CDECL _dos_getdiskfree(unsigned, struct diskfree_t *);
unsigned _CDECL _dos_getfileattr(char *, unsigned *);
unsigned _CDECL _dos_getftime(int, unsigned *, unsigned *);
void _CDECL _dos_gettime(struct dostime_t *);
void _CDECL _dos_keep(unsigned, unsigned);
unsigned _CDECL _dos_open(char *, unsigned, int *);
unsigned _CDECL _dos_setblock(unsigned, unsigned, unsigned *);
unsigned _CDECL _dos_setdate(struct dosdate_t *);
void _CDECL _dos_setdrive(unsigned, unsigned *);
unsigned _CDECL _dos_setfileattr(char *, unsigned);
unsigned _CDECL _dos_setftime(int, unsigned, unsigned);
unsigned _CDECL _dos_settime(struct dostime_t *);
int _CDECL dosexterr(struct DOSERROR *);
void _CDECL _enable(void);
void _CDECL _hardresume(int);
void _CDECL _hardretn(int);
int _CDECL intdos(union REGS *, union REGS *);
int _CDECL intdosx(union REGS *, union REGS *, struct SREGS *);
int _CDECL int86(int, union REGS *, union REGS *);
int _CDECL int86x(int, union REGS *, union REGS *, struct SREGS *);
void _CDECL segread(struct SREGS *);
#ifndef NO_EXT_KEYS /* extensions enabled */
void _CDECL _chain_intr(void (_CDECL interrupt far *)());
void (_CDECL interrupt far * _CDECL _dos_getvect(unsigned))();
unsigned _CDECL _dos_read(int, void far *, unsigned, unsigned *);
void _CDECL _dos_setvect(unsigned, void (_CDECL interrupt far *)());
unsigned _CDECL _dos_write(int, void far *, unsigned, unsigned *);
void _CDECL _harderr(void (far *)());
#endif /* NO_EXT_KEYS */
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