这是一个头文件，里面包含了很多BIOS和DOS调用函数

概述

文件内容

包含的函数(peekb poke pokeb ranbrd randbwr segread sleep setblock unlike dostounix unixtodo)

概述

这是一个头文件，里面包含了很多BIOS和DOS调用函数

文件内容

/*

* dos.h

* This file has no copyright assigned and is placed in the Public Domain.

* This file is a part of the mingw-runtime package.

* No warranty is given; refer to the file DISCLAIMER within the package.

*

* DOS-specific functions and structures.

*

*/

#ifndef _DOS_H_

#define _DOS_H_

/* All the headers include this file. */

#include <_mingw.h>

#define __need_wchar_t

#ifndef RC_INVOKED

#include <stddef.h>

#endif /* Not RC_INVOKED */

/* For DOS file attributes */

#include <io.h>

#ifndef RC_INVOKED

#ifdef __cplusplus

extern "C" {

#endif

#ifndef __MSVCRT__ /* these are in CRTDLL, but not MSVCRT */

#ifndef __DECLSPEC_SUPPORTED

extern unsigned int *_imp___basemajor_dll;

extern unsigned int *_imp___baseminor_dll;

extern unsigned int *_imp___baseversion_dll;

extern unsigned int *_imp___osmajor_dll;

extern unsigned int *_imp___osminor_dll;

extern unsigned int *_imp___osmode_dll;

#define _basemajor (*_imp___basemajor_dll)

#define _baseminor (*_imp___baseminor_dll)

#define _baseversion (*_imp___baseversion_dll)

#define _osmajor (*_imp___osmajor_dll)

#define _osminor (*_imp___osminor_dll)

#define _osmode (*_imp___osmode_dll)

#else /* __DECLSPEC_SUPPORTED */

__MINGW_IMPORT unsigned int _basemajor_dll;

__MINGW_IMPORT unsigned int _baseminor_dll;

__MINGW_IMPORT unsigned int _baseversion_dll;

__MINGW_IMPORT unsigned int _osmajor_dll;

__MINGW_IMPORT unsigned int _osminor_dll;

__MINGW_IMPORT unsigned int _osmode_dll;

#define _basemajor _basemajor_dll

#define _baseminor _baseminor_dll

#define _baseversion _baseversion_dll

#define _osmajor _osmajor_dll

#define _osminor _osminor_dll

#define _osmode _osmode_dll

#endif /* __DECLSPEC_SUPPORTED */

#endif /* ! __MSVCRT__ */

#ifndef _DISKFREE_T_DEFINED

/* needed by _getdiskfree (also in direct.h) */

struct _diskfree_t {

unsigned total_clusters;

unsigned avail_clusters;

unsigned sectors_per_cluster;

unsigned bytes_per_sector;

};

#define _DISKFREE_T_DEFINED

#endif

_CRTIMP unsigned __cdecl _getdiskfree (unsigned, struct _diskfree_t *);

#ifndef _NO_OLDNAMES

# define diskfree_t _diskfree_t

#endif

#ifdef __cplusplus

}

#endif

#endif /* Not RC_INVOKED */

#endif /* Not _DOS_H_ */

包含的函数

peekb

函数名称: peekb

函数原型: int peekb(unsigned segment, unsigned offset)

函数功能: 内存中读出一个字（8位）

函数返回: 读出的字内容

参数说明: segmemt-段地址，offset-段内偏移地址

所属文件: <dos.h>

#include <stdio.h>

#include <conio.h>

#include <dos.h>

int main()

{

int value=0;

printf("The current status of your keyboard is:");

value=peek(0x0040,0x0017);

if (value&1)

printf("Right shift on");

else

printf("Right shift off");

if (value&2)

printf("Left shift on");

else

printf("Left shift off");

if (value&4)

printf("Control key on");

else

printf("Control key off");

if (value&8)

printf("Alt key on");

else

printf("Alt key off");

if (value&16)

printf("Scroll lock on");

else

printf("Scroll lock off");

if (value&32)

printf("Num lock on");

else

printf("Num lock off");

if (value&64)

printf("Caps lock on");

else

printf("Caps lock off");

return 0;

}

poke

函数名称: poke

函数原型: void poke(unsigned segment, unsigned offset,int word)

函数功能: 往内存中写入一个字（16位）

函数返回:

参数说明: segmemt-段地址，offset-段内偏移地址，word-要写入的字

所属文件: <dos.h>

#include <dos.h>

#include <conio.h>

int main()

{

clrscr();

cprintf("Make sure the scroll lock key is off and press any key");

getch();

poke(0x0000,0x0417,16);

cprintf("The scroll lock is now on");

return 0;

}

pokeb

函数名称: pokeb

函数原型: void pokeb(unsigned segment, unsigned offset,char ch)

函数功能: 往内存中写入一个字（8位）

函数返回:

参数说明: segmemt-段地址，offset-段内偏移地址，ch-要写入的字

所属文件: <dos.h>

#include <dos.h>

#include <conio.h>

int main()

{

clrscr();

cprintf("Make sure the scroll lock key is off and press any key");

getch();

pokeb(0x0000,0x0417,16);

cprintf("The scroll lock is now on");

return 0;

}

ranbrd

函数名称: randbrd

函数原型: int randbrd(struct fcb *fcb, int rcnt)

函数功能: 使用DOS 0x27中断，将文件内容读入磁盘缓冲区

函数返回: 0-读取所有记录

1-文件结束

2-循环读取

3-文件结束，但最后一条记录未完成

参数说明: rcnt-记录条数

所属文件: <dos.h>

#include <process.h>

#include <string.h>

#include <stdio.h>

#include <dos.h>

int main()

{

char far *save_dta;

char line[80],buffer[256];

struct fcb blk;

int i,result;

printf("Enter drive and file name");

gets(line);

if (!parsfnm(line,&blk,1))

{

printf("Error in call to parsfnm");

exit(1);

}

printf("Drive #%d File: %s",blk.fcb_drive,blk.fcb_name);

bdosptr(0x0F,&blk,0);

save_dta=getdta();

setdta(buffer);

blk.fcb_recsize=128;

blk.fcb_random=0L;

result=randbrd(&blk,1);

if (!result)

printf("Read OK");

else

{

perror("Error during read");

exit(1);

}

printf("The first 128 characters are:");

for (i=0;i<128;i++)

putchar(buffer);

setdta(save_dta);

return 0;

}

randbwr

函数名称: randbwr

函数原型: int randbwr(struct fcb *fcb, int rcnt)

函数功能: 使用DOS 0x28中断，将磁盘缓冲区内容写入文件

函数返回: 0-写完所有记录

1-磁盘空间不足，未操作

2-写记录绕回 0xFFFF

参数说明: rcnt-记录条数

所属文件: <dos.h>

#include <process.h>

#include <string.h>

#include <stdio.h>

#include <dos.h>

int main()

{

char far *save_dta;

char line[80];

char buffer[256]="RANDBWR test!";

struct fcb blk;

int result;

printf("Enter a file name to create");

gets(line);

parsfnm(line,&blk,1);

printf("Drive #%d File: %s",blk.fcb_drive,blk.fcb_name);

if (bdosptr(0x16,&blk,0)==-1)

{

perror("Error creating file");

exit(1);

}

save_dta=getdta();

setdta(buffer);

blk.fcb_recsize=256;

blk.fcb_random=0L;

result=randbwr(&blk,1);

if (!result)

printf("Write OK");

else

{

perror("Disk error");

exit(1);

}

if (bdosptr(0x10,&blk,0)==-1)

{

perror("Error closing file");

exit(1);

}

setdta(save_dta);

return 0;

}

segread

函数名称: segread

函数原型: void segread(struct SREGS *segp)

函数功能: 按SREGS格式设置断寄存器的数值

函数返回:

参数说明: 该函数得到的segp参数供intdosx和int86函数使用segp段寄存器内容，结构SREGS定义如下：

struct SREGS{

unsigned int es;

unsigned int cs;

unsigned int ss;

unsigned int ds;

};

所属文件: <dos.h>

#include <stdio.h>

#include <dos.h>

int main()

{

struct SREGS segs;

segread(&segs);

printf("Current segment register settings");

printf("CS: %X DS: %X",segs.cs,segs.ds);

printf("ES: %X SS: %X",segs.es,segs.ss);

return 0;

}

sleep

函数名称: sleep

函数原型: void sleep(unsigned seconds)

函数功能: seconds-停止运行的秒数

函数返回:

参数说明:

所属文件: <dos.h>

#include <dos.h>

#include <stdio.h>

int main()

{

int i;

for (i=1;i<5;i++)

{

printf("Sleeping for %d seconds",i);

sleep(i);

}

return 0;

}

setblock

函数名称: setblock

函数原型: int setblock(unsigned segx,unsigned newsize)

函数功能: 修改段地址为segx的内存块的大小

函数返回:

参数说明: segx-内存块的段地址，该地址是使用allocmem分配的

所属文件: <dos.h>

#include <dos.h>

#include <alloc.h>

#include <stdio.h>

#include <stdlib.h>

int main()

{

unsigned int size,segp;

int stat;

size=64; /* (64 x 16)=1024 bytes */

stat=allocmem(size,&segp);

if (stat==-1)

printf("Allocated memory at segment: %X",segp);

else

{

printf("Failed: maximum number of paragraphs available is %d",stat);

exit(1);

}

stat=setblock(segp,size*2);

if (stat==-1)

printf("Expanded memory block at segment: %X",segp);

else

printf("Failed: maximum number of paragraphs available is %d",stat);

freemem(segp);

return 0;

}

unlike

函数名称: unlink

函数原型: int unlink(const char *fname)

函数功能: 删除一个指定文件

函数返回: 0:操作成功，-1:操作失败

参数说明: fname-要删除的文件名称

所属文件: <dos.h>

#include <stdio.h>

#include <io.h>

int main()

{

FILE *fp=fopen("junk.jnk","w");

int status;

fprintf(fp,"junk");

status=access("junk.jnk",0);

if (status == 0)

printf("File exists");

else

printf("File doesn't exist");

fclose(fp);

unlink("junk.jnk");

status=access("junk.jnk",0);

if (status==0)

printf("File exists");

else

printf("File doesn't exist");

return 0;

}

dostounix

函数名称: dostounix

函数原型: long dostounix(struct data *d,struct time *t)

函数功能: 将DOS的日期和时间格式转换成UNIX标准

函数返回:

参数说明: d,t-日期和时间指针

所属文件: <dos.h>

#include <time.h>

#include <stddef.h>

#include <dos.h>

#include <stdio.h>

int main()

{

time_t t;

struct time d_time;

struct date d_date;

struct tm *local;

getdate(&d_date);

gettime(&d_time);

t=dostounix(&d_date,&d_time);

local=localtime(&t);

printf("Time and Date: %s",asctime(local));

return 0;

}

unixtodo

函数名称: unixtodos

函数原型: void unixtodos(long utime, struct date *d, struct time *t)

函数功能: 将UNIX格式的时间和日期转换成DOS格式

函数返回:

参数说明: utime-UNIX格式的时间日期.d,t-DOS格式的日期时间

所属文件: <dos.h>

#include <stdio.h>

#include <dos.h>

char *month[]={"---","Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};

#define SECONDS_PER_DAY 86400L

struct date dt;

struct time tm;

int main()

{

unsigned long val;

getdate(&dt);

gettime(&tm);

printf("today is %d %s %d",dt.da_day,month[dt.da_mon],dt.da_year);

val=dostounix(&dt,&tm);

val-=(SECONDS_PER_DAY*42);

unixtodos(val,&dt,&tm);

printf("42 days ago it was %d %s %d",dt.da_day,month[dt.da_mon],dt.da_year);

return 0;

}

未完待续.