Why this code crash ?

[MaaSTaaR]

Hello

i get this code from RYMOS : http://sourceforge.net/projects/rymos

unsigned int k_printf(char *message, unsigned int line)
{
	char *vidmem = (char *) 0xb8000;
	unsigned int i=0;

	i=(line*80*2);

	while(*message!=0) // 24h
	{
		if(*message==0x2F)
		{
			*message++;
			if(*message==0x6e)
			{
				line++;
				i=(line*80*2);
				*message++;
				if(*message==0)
				{
					return(1);
				};
			};
		};
		vidmem[i]=*message;
		*message++;
		i++;
		vidmem[i]=0x7;
		i++;
	};

	return(1);
};

i try to compile it with Dev-C++ , no any errors but when i run programme it's crash and show report problem (Windows XP)

[orbitz]

How do you knwo the problem is here? Are you sure it's not somewhere else? What line is the error on? Are you sure that this isn't just where the problem shows itself? Can you provide any helpful information at all?

[MaaSTaaR]

Hello ..

this is errors which show for me when i try run this code

unsigned int k_printf(char *message, unsigned int line)
{
	char *vidmem = (char *) 0xb8000;
	unsigned int i=0;

	i=(line*80*2);

	while(*message!=0) // 24h
	{
		if(*message==0x2F)
		{
			*message++;
			if(*message==0x6e)
			{
				line++;
				i=(line*80*2);
				*message++;
				if(*message==0)
				{
					return(1);
				};
			};
		};
		vidmem[i]=*message;
		*message++;
		i++;
		vidmem[i]=0x7;
		i++;
	};

	return(1);
};

int main() {
    k_printf("Test",0);
}

[quzah]

My guess is your attempt to assign a pointer to some spot in memory in hopes it's actually video memory, and then tweek it, under Windows XP:

char *vidmem = (char *) 0xb8000;

Quzah.

[Salem]

Or you could just stop trying to use the low-level code from one operating system as high level code on another operating system.

Or explain why you want to do this, and why the regular printf() isn't adequate for your needs.