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Avoid warning when compiling. #4

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Avoid warning when compiling. #4

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57 changes: 29 additions & 28 deletions evolution_by_versions/03_539kernel_progenitor/main.c
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Original file line number Diff line number Diff line change
@@ -1,45 +1,46 @@
volatile unsigned char *video = 0xB8000;
volatile unsigned char *video = (unsigned char *)0xB8000;

int nextTextPos = 0;
int currLine = 0;

void print( char * );
void print(char *);
void println();
void printi( int );
void printi(int);

void kernel_main()
{
print( "Welcome to 539kernel!" );
print("Welcome to 539kernel!");
println();
print( "We are now in Protected-mode" );
print("We are now in Protected-mode");
println();
printi( 539 );
printi(539);
println();

while( 1 );

while (1)
;
}

void interrupt_handler( int interrupt_number )
void interrupt_handler(int interrupt_number)
{
println();
print( "Interrupt Received " );
printi( interrupt_number );
print("Interrupt Received ");
printi(interrupt_number);
}

void print( char *str )
void print(char *str)
{
int currCharLocationInVidMem, currColorLocationInVidMem;
while ( *str != '\0' )

while (*str != '\0')
{
currCharLocationInVidMem = nextTextPos * 2;
currCharLocationInVidMem = nextTextPos * 2;
currColorLocationInVidMem = currCharLocationInVidMem + 1;
video[ currCharLocationInVidMem ] = *str;
video[ currColorLocationInVidMem ] = 15;

video[currCharLocationInVidMem] = *str;
video[currColorLocationInVidMem] = 15;

nextTextPos++;

str++;
}
}
Expand All @@ -49,21 +50,21 @@ void println()
nextTextPos = ++currLine * 80;
}

void printi( int number )
void printi(int number)
{
char* digitToStr[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
if ( number >= 0 && number <= 9 )
char *digitToStr[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"};

if (number >= 0 && number <= 9)
{
print( digitToStr[ number ] );
print(digitToStr[number]);
return;
}
else
{
int remaining = number % 10;
number = number / 10;
printi( number );
printi( remaining );

printi(number);
printi(remaining);
}
}