C language library function Daquan (letter B) --- instructions for use)

C language library function Daquan (letter B) --- instructions for use (conversion) -- Linux general technology-Linux programming and kernel information, the following is read details. Function Name: bar
Function: Draw a two-dimensional bar chart
Usage: void far bar (int left, int top, int right, int bottom );
Program example:
# Include
# Include
# Include
# Include

Int main (void)
{
/* Request auto detection */
Int gdriver = DETECT, gmode, errorcode;
Int midx, midy, I;

/* Initialize graphics and local variables */
Initgraph (& gdriver, & gmode ,"");

/* Read result of initialization */
Errorcode = graphresult ();
If (errorcode! = GrOk)/* an error occurred */
{
Printf ("Graphics error: % s \ n", grapherrormsg (errorcode ));
Printf ("Press any key to halt :");
Getch ();
Exit (1);/* terminate with an error code */
}

Midx = getmaxx ()/2;
Midy = getmaxy ()/2;

/* Loop through the fill patterns */
For (I = SOLID_FILL; I {
/* Set the fill style */
Setfillstyle (I, getmaxcolor ());

/* Draw the bar */
Bar (midx-50, midy-50, midx + 50,
Midy + 50 );

Getch ();
}

/* Clean up */
Closegraph ();
Return 0;
}

Function Name: bar3d
Function: Draw a three-dimensional bar chart
Usage: void far bar3d (int left, int top, int right, int bottom,
Int depth, int topflag );
Program example:

# Include
# Include
# Include
# Include

Int main (void)
{
/* Request auto detection */
Int gdriver = DETECT, gmode, errorcode;
Int midx, midy, I;

/* Initialize graphics, local variables */
Initgraph (& gdriver, & gmode ,"");

/* Read result of initialization */
Errorcode = graphresult ();
If (errorcode! = GrOk)/* an error occurred */
{
Printf ("Graphics error: % s \ n", grapherrormsg (errorcode ));
Printf ("Press any key to halt :");
Getch ();
Exit (1);/* terminate with error code */
}

Midx = getmaxx ()/2;
Midy = getmaxy ()/2;

/* Loop through the fill patterns */
For (I = EMPTY_FILL; I {
/* Set the fill style */
Setfillstyle (I, getmaxcolor ());

/* Draw the 3-d bar */
Bar3d (midx-50, midy-50, midx + 50, midy + 50, 10, 1 );

Getch ();
}

/* Clean up */
Closegraph ();
Return 0;
}

Function Name: bdos
Power: DOS system call
Usage: int bdos (int dosfun, unsigned dosdx, unsigned dosal );
Program example:

# Include
# Include

/* Get current drive as 'A', 'B ',...*/
Char current_drive (void)
{
Char curdrive;

/* Get current disk as 0, 1 ,...*/
Curdrive = bdos (0x19, 0, 0 );
Return ('A' + curdrive );
}

Int main (void)
{
Printf ("The current drive is % c: \ n", current_drive ());
Return 0;
}

Function Name: bdosptr
Power: DOS system call
Usage: int bdosptr (int dosfun, void * argument, unsigned dosal );
Program example:

# Include
# Include
# Include
# Include
# Include
# Include

# Define BUFLEN 80

Int main (void)
{
Char buffer [BUFLEN];
Int test;

Printf ("Enter full pathname of a directory \ n ");
Gets (buffer );

Test = bdosptr (0x3B, buffer, 0 );
If (test)
{
Printf ("DOS error message: % d \ n", errno );
/* See errno. h for error listings */
Exit (1 );
}

Getcwd (buffer, BUFLEN );
Printf ("The current directory is: % s \ n", buffer );

Return 0;
}

Function Name: bioscom
Function: serial I/O communication
Usage: int bioscom (int cmd, char abyte, int port );
Program example:

# Include
# Include

# Define COM1 0
# Define DATA_READY 0x100
# Define TRUE 1
# Define FALSE 0

# Define SETTINGS (0x80 | 0x02 | 0x00 | 0x00)

Int main (void)
{
Int in, out, status, DONE = FALSE;

Bioscom (0, SETTINGS, COM1 );
Cprintf ("... BIOSCOM [ESC] to exit... \ n ");
While (! DONE)
{
Status = bioscom (3, 0, COM1 );
If (status & DATA_READY)
If (out = bioscom (2, 0, COM1) & 0x7F )! = 0)
Putch (out );
If (kbhit ())
{
If (in = getch () = '\ x1B ')
DONE = TRUE;
Bioscom (1, in, COM1 );
}
}
Return 0;
}

Function Name: biosdisk
Function: Hard Disk I/O
Usage: int biosdisk (int cmd, int drive, int head, int track, int sector
Int nsects, void * buffer );
Program example:

# Include
# Include

Int main (void)
{
Int result;
Char buffer [512];

Printf ("Testing to see if drive a: is ready \ n ");
Result = biosdisk (, buffer );
Result & = 0x02;
(Result )? (Printf ("Drive A: Ready \ n ")):
(Printf ("Drive A: Not Ready \ n "));

Return 0;
}

Function Name: biosequip
Skill: Check the device
Usage: int biosequip (void );
Program example:

# Include
# Include

Int main (void)
{
Int result;
Char buffer [512];

Printf ("Testing to see if drive a: is ready \ n ");
Result = biosdisk (, buffer );
Result & = 0x02;
(Result )? (Printf ("Drive A: Ready \ n ")):
(Printf ("Drive A: Not Ready \ n "));

Return 0;
}

Function Name: bioskey
Function: Use the keyboard interface of the BIOS service directly.
Usage: int bioskey (int cmd );
Program example:

# Include
# Include
# Include

# Define RIGHT 0x01
# Define LEFT 0x02
# Define CTRL 0x04
# Define ALT 0x08

Int main (void)
{
Int key, modifiers;

/* Function 1 returns 0 until a key is pressed */
While (bioskey (1) = 0 );

/* Function 0 returns the key that is waiting */
Key = bioskey (0 );

/* Use function 2 to determine if shift keys were used */
Modifiers = bioskey (2 );
If (modifiers)
{
Printf ("[");
If (modifiers & RIGHT) printf ("RIGHT ");
If (modifiers & LEFT) printf ("LEFT ");
If (modifiers & CTRL) printf ("CTRL ");
If (modifiers & ALT) printf ("ALT ");
Printf ("]");
}
/* Print out the character read */
If (isalnum (key & 0xFF ))
Printf ("'% C' \ n", key );
Else
Printf ("% # 02x \ n", key );
Return 0;
}

Function Name: biosmemory
Function: return the size of the storage block.
Usage: int biosmemory (void );
Program example:

# Include
# Include

Int main (void)
{
Int memory_size;

Memory_size = biosmemory ();/* returns value up to 640 K */
Printf ("RAM size = % dK \ n", memory_size );
Return 0;
}

Function Name: biosprint
Power: directly use the BIOS service printer I/O
Usage: int biosprint (int cmd, int byte, int port );
Program example:

# Include
# Include
# Include

Int main (void)
{
# Define STATUS 2/* printer status command */
# Define PORTNUM 0/* port number for LPT1 */

Int status, abyte = 0;

Printf ("Please turn off your printer. Press any key to continue \ n ");
Getch ();
Status = biosprint (STATUS, abyte, PORTNUM );
If (status & 0x01)
Printf ("Device time out. \ n ");
If (status & 0x08)
Printf ("I/O error. \ n ");

If (status & 0x10)
Printf ("Selected. \ n ");
If (status & 0x20)
Printf ("Out of paper. \ n ");

If (status & 0x40)
Printf ("Acknowledge. \ n ");
If (status & 0x80)
Printf ("Not busy. \ n ");

Return 0;
}

Function Name: biostime
Function: read or set the BIOS time.
Usage: long biostime (int cmd, long newtime );
Program example:

# Include
# Include
# Include
# Include

Int main (void)
{
Long bios_time;

Clrscr ();
Cprintf ("The number of clock ticks since midnight is: \ r \ n ");
Cprintf ("The number of seconds since midnight is: \ r \ n ");
Cprintf ("The number of minutes since midnight is: \ r \ n ");
Cprintf ("The number of hours since midnight is: \ r \ n ");
Cprintf ("\ r \ nPress any key to quit :");
While (! Kbhit ())
{
Bios_time = biostime (0, 0L );

Gotoxy (50, 1 );
Cprintf ("% lu", bios_time );

Gotoxy (50, 2 );
Cprintf ("%. 4f", bios_time/CLK_TCK );

Gotoxy (50, 3 );
Cprintf ("%. 4f", bios_time/CLK_TCK/60 );

Gotoxy (50, 4 );
Cprintf ("%. 4f", bios_time/CLK_TCK/3600 );
}
Return 0;
}

Function Name: brk
Function: change the data segment space allocation
Usage: int brk (void * endds );
Program example:

# Include
# Include

Int main (void)
{
Char * ptr;

Printf ("Changing allocation with brk () \ n ");
Ptr = malloc (1 );
Printf ("Before brk () call: % lu bytes free \ n", coreleft ());
Brk (ptr + 1000 );
Printf ("After brk () call: % lu bytes free \ n", coreleft ());
Return 0;
}

Function Name: bsearch
Merit: Binary Search
Usage: void * bsearch (const void * key, const void * base, size_t * nelem,
Size_t width, int (* fcmp) (const void *, const *));
Program example:

# Include
# Include

# Define NELEMS (arr) (sizeof (arr)/sizeof (arr [0])

Int numarray [] = {123,145,512,627,800,933 };

Int numeric (const int * p1, const int * p2)
{
Return (* p1-* p2 );
}

Int lookup (int key)
{
Int * itemptr;

/* The cast of (int (*) (const void *, const void *))
Is needed to avoid a type mismatch error
Compile time */
Itemptr = bsearch (& key, numarray, NELEMS (numarray ),
Sizeof (int), (int (*) (const void *, const void *) numeric );
Return (itemptr! = NULL );
}

Int main (void)
{
If (lookup (512 ))
Printf ("512 is in the table. \ n ");
Else
Printf ("512 isn' t in the table. \ n ");

Return 0;
}