Thread: Register tranfer language interpreter in C

why do you need a to "psedo" a CPU instruction set (ASM)? seems kinda pointless to me :\ . why don't you just make a real assembler (lol)?

is this what you want (pardon my D )?

Code:

/*
CASM - a "psedo"-asmbler
by Samuel Fredrickson
*/

import std.c.stdio;

/* global registers - just the basics*/
char[2] ax;
char[2] bx;
char[2] cx;
char[2] dx;

void mov(char[32] line)
{
	if(line[3] != ' ')
	{
		printf("ERROR: mov syntax is \'mov [dest],[value]\'\n");
	}
	if(line[4] == 'a' && line[5] == 'x')
	{
		ax[0] = line[7];
		ax[1] = line[8];
		printf("ax = %c%c\n",ax[0],ax[1]);
		return;
	}
	else if(line[4] == 'b' && line[5] == 'x')
	{
		bx[0] = line[7];
		bx[1] = line[8];
		printf("bx = %c%c\n",ax[0],ax[1]);
		return;
	}
	else if(line[4] == 'c' && line[5] == 'x')
	{
		cx[0] = line[7];
		cx[1] = line[8];
		printf("bx = %c%c\n",ax[0],ax[1]);
		return;
	}
	else if(line[4] == 'd' && line[5] == 'x')
	{
		dx[0] = line[7];
		dx[1] = line[8];
		printf("dx = %c%c\n",ax[0],ax[1]);
		return;
	}
}

int main(char[][] args)
{
	char *filename;
	FILE *f;
	static char buff[32];
	int i;
	
	for(i = 0;i <= args.length;i++)
	{
		if(args[i] == "-f")
		{
			filename = args[i+1];
		}
	}
	if( (f = fopen(filename,"r")) == null)
	{
		printf("ERROR: Could not Open File");
		return 0;
	}
	
	// get line information
	while((fgets(buff,32,f)) != null)
	{
		if(buff[0] == 'm' && buff[1] ==	'o' && buff[2] == 'v')
		{
			mov(buff);
		}
	}
	return 0;
}

there are some bugs -- mainly if I try to 'mov' anything else besides ax, it gets the value wrong.

pardon the D code again -- it shouldn't be that hard to translate to C/C++

No timing issues, no binary, nothing hard.

yeah, im not a genius at programming and I could do something like that. this is a question that if answered might help him to(i also need it answered), what is the best way to parse a file without using alot of switch/if/else statements?