Power-Programmierung/CD2.mdf/c/library/mslang/cursor/cursor.c

C/C++ Source or Header | 1994-03-18 | 11KB | 194 lines

#include <conio.h>
#include "cursor.h"

 /*************************************************************************\
|                                                                           |
|  Programmer     : Omer YALHI                                              |
|  CompuServe     : 71501,243                                               |
|  America OnLine : Falcon Men                                              |
|  Internet       : [e-mail]                                        |
|  Type           : Freeware                                                |
|  Purpose        : Some cursor routines                                    |
|  Version        : 1.0                                                     |
|  Last Modified  : March 18'94                                             |
|  Compiler Used  : Microsoft Visual C++ 1.0                                |
|                                                                           |
 \*************************************************************************/

 /*************************************************************************\
|                              FUNCTIONS                                    |
 \*************************************************************************/

 /*************************************************************************\
|                                                                           |
| void eeol();                                                              |
|___________________________________________________________________________|
|                                                                           |
| Erases the line from current cursor position to the end of line           |
| Uses whatever the current attribute is.  Doesn't change the               |
| cursor position.                                                          |
|___________________________________________________________________________|
|                                                                           |
| Inputs  : None                                                            |
| Returns : None                                                            |
|                                                                           |
 \*************************************************************************/
void eeol()
{
    int    x = wherex();                /* get current col */
    int    y = wherey();                /* get current row */
    int    xOld = x;                    /* save current col */
    int    yOld = y;                    /* save current row */
    int    styleOld = getcursor();        /* save cursor style */

    showcursor(NOCURSOR);            /* hide cursor */
    for(; x < 80; x++)    {            /* start from current location */
        gotoxy(x, y);                /*   till the end of line */
        _cprintf(" ");                /*   and erase the character */
    }
    showcursor(styleOld);            /* show cursor as it was before */
    gotoxy(xOld, yOld);                /* place cursor where it was before */
}

 /*************************************************************************\
|                                                                           |
| void gotoxy(int x, int y);                                                |
|___________________________________________________________________________|
|                                                                           |
| Places cursor to the specified postion.  Uses page 0.                     |
|___________________________________________________________________________|
|                                                                           |
| Inputs  : int x -> column for cursor (lowest = 1)                         |
| Returns : int y -> row for cursor (lowest = 1)                            |
|                                                                           |
 \*************************************************************************/
void gotoxy(int x, int y)
{
    x--;                            /* service uses base 0 so decrement */
    y--;                            /* service uses base 0 so decrement */
    __asm    {
        mov    ah, 2                    /* service no 2 */
        mov    bh, 0                    /* use page number 0 */
        mov    cx, y                    /* y is in cl now, don't care what ch is */
        mov    dx, x                   /* put col info in dx.  x is in dl now */
        mov    dh, cl                    /* put row info in dh.  dx has row and col info */
        int    10h                        /* invoke interrupt routine */
    }
}

 /*************************************************************************\
|                                                                           |
| int wherey();                                                             |
|___________________________________________________________________________|
|                                                                           |
| Returns the current row position of the cursor.  Uses page number 0.      |
|___________________________________________________________________________|
|                                                                           |
| Inputs  : None                                                            |
| Returns : current row postion of the cursor                               |
|                                                                           |
 \*************************************************************************/
int wherey()
{
    int    y;                            /* value to be returned */

    __asm    {
        mov ah, 3                    /* service no 3 */
        mov bh, 0                    /* use page number 0 */
        int    10h                     /* invoke interrupt routine */
        mov    dl, dh                  /* dh has row information, so put in loe byte */
        xor dh, dh                  /* we don't need dh */
        inc    dl                      /* service uses base 0, so increment */
        mov    y, dx                    /* save row information y */
    }
    return    y;                        /* return row number */
}

 /*************************************************************************\
|                                                                           |
| int wherex();                                                             |
|___________________________________________________________________________|
|                                                                           |
| Returns the current column position of the cursor.  Uses page number 0.   |
|___________________________________________________________________________|
|                                                                           |
| Inputs  : None                                                            |
| Returns : current column postion of the cursor                            |
|                                                                           |
 \*************************************************************************/
int wherex()
{
    int    x;                            /* value to be returned */

    __asm    {
        mov ah, 3                    /* service no 3 */
        mov bh, 0                    /* use page number 0 */
        int    10h                     /* invoke interrupt routine */
        xor dh, dh                  /* col info is in dl, we don't need dh */
        inc    dl                      /* service uses base 0, so increment */
        mov    x, dx                    /* save col information in x */
    }
    return    x;                        /* return column number */
}

 /*************************************************************************\
|                                                                           |
| void showcursor(int style);                                               |
|___________________________________________________________________________|
|                                                                           |
| Changes the shape of the cursor according to the style.                   |
|___________________________________________________________________________|
|                                                                           |
| Inputs  : int style -> style to be used.  Available styles defined in     |
|                        cursor.h are :                                     |
|                                                                           |
|                        NOCURSOR                                           |
|                        NORMALCURSOR                                       |
|                        BLOCKCURSOR                                        |
|                                                                           |
| Returns : None                                                            |
|                                                                           |
 \*************************************************************************/
void showcursor(int style)
{
    __asm    {
        mov    ah, 1                    /* service no 1 */
        mov cx, style                /* put style in cx */
        int    10h                        /* invoke interrupt routine */
    }
}

 /*************************************************************************\
|                                                                           |
| int getcursor();                                                          |
|___________________________________________________________________________|
|                                                                           |
| Returns the style of the cursor.                                          |
|___________________________________________________________________________|
|                                                                           |
| Inputs  : None                                                            |
|                                                                           |
| Returns : style -> Available styles defined in cursor.h are :             |
|                                                                           |
|                        NOCURSOR                                           |
|                        NORMALCURSOR                                       |
|                        BLOCKCURSOR                                        |
|                                                                           |
|                    Note that the returned value might not be one of the   |
|                    defined styles.                                        |
|                                                                           |
 \*************************************************************************/
int getcursor()
{
    int    style;                        /* value to be returned */

    __asm    {
        mov    ah, 3                    /* service no 3 */
        mov    bh, 0                    /* use page number 0 */
        int    10h                        /* invoke interrupt routine */
        mov    style, cx                /* put info in style */
    }
    return style;                    /* return style */
}