?? vector-demo.c
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#include <geos.h>#include <conio.h>#include <stdlib.h>unsigned char x,y;void_func oldMouseVector, oldKeyVector;void foo1 (void) { // do something on mouse press/release gotoxy(x,y); ++x; cputc('A'); // call previous routine oldMouseVector();}void foo2 (void) { // do something on key press/release gotoxy(x,y); ++y; cputc('B'); // call previous routine oldKeyVector();}void hook_into_system(void) { // hook into system vectors - preserve old value oldMouseVector = mouseVector; mouseVector = foo1; oldKeyVector = keyVector; keyVector = foo2;}void remove_hooks(void) { mouseVector = oldMouseVector; keyVector = oldKeyVector;}int main(void) { x = 0; y = 0;/* To make cc65 do something for you before exiting you might register a function to be called using atexit call. #include <stdlib.h> then and write:*/ atexit(&remove_hooks); clrscr(); cputsxy(0,1, CBOLDON "Just" COUTLINEON "a " CITALICON "string." CPLAINTEXT ); hook_into_system();/* This program will loop forever though */ MainLoop();/* If not using atexit() you have to remember about restoring system vectors right before exiting your application. Otherwise the system will most likely crash. remove_hooks();*/ return 0;}
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