sml_v1.c

/*
SML(simple machine language) simulator Simpletron DEMO.
Language Format: xxbb
The Lower 2 digits bb is memory address.
The Higher 2 digits xx is the operater.
Operators: READ, WRITE, LOAD, STORE, ADD, SUB, MUL, DIV, MOD, JMP, JMPN, JMPE, HALT
winxos 2012-11-04
*/
#define _CRT_SECURE_NO_WARNINGS
//¡ü for cancel visual studio 15' warnings (C4996: unsafe scanf).
#include <stdio.h>
#include <string.h>
#define READ 10
#define WRITE 11
#define LOAD 20
#define STORE 21
#define ADD 30
#define SUB 31
#define MUL 32
#define DIV 33
#define MOD 34
#define JMP 40
#define JMPN 41
#define JMPZ 42
#define HALT 43
#define MAX_MEM 100
int mem[MAX_MEM] = { 0 }, ADDER = 0; //ONLY ONE REGISTER ADDER
void showMemory() //Pretty Show Memory For Debugging 
{
	int i;
	printf("\nMEMORY:\n   ");
	for (i = 0; i<10; i++) printf("%6d", i);
	printf("\n  0");
	for (i = 0; i<MAX_MEM; i++)
	{
		printf("%6d", mem[i]);
		if (i % 10 == 9 && i != MAX_MEM - 1) printf("\n%3d", 1 + i / 10);
	}
	printf("\n");
}
void loadCode(int c[])
{
	int len = 0;
	while (c[len++] != -1);
	memset(mem, 0, sizeof(int)*MAX_MEM);
	memcpy(mem, c, len * sizeof(int));
}
void runSML() //
{
	int op = 0, addr = 0, *pt = mem;
	while (1)
	{
		op = *pt / 100;	//xxbb
		addr = *pt % 100;
		pt++;
		switch (op)
		{
		case READ:printf("INPUT:"); scanf("%d", &mem[addr]); break;
		case WRITE:printf("%d ", mem[addr]); break;
		case LOAD:ADDER = mem[addr]; break;
		case STORE:mem[addr] = ADDER; break;
		case ADD:ADDER += mem[addr]; break;
		case SUB:ADDER -= mem[addr]; break;
		case MUL:ADDER *= mem[addr]; break;
		case DIV:ADDER /= mem[addr]; break;
		case JMP:pt = mem + addr; break;
		case JMPN:ADDER<0 ? pt = mem + addr : 0; break;
		case JMPZ:ADDER == 0 ? pt = mem + addr : 0; break;
		case HALT:printf("\nHALT"); return;
		default:break;
		}
	}
}
int buf[MAX_MEM];
int* inputCode()
{
	printf("Enter -1 to end input.\n\n");
	int ct = 0, li = 0;
	while (ct != -1)
	{
		printf("%02d ? ", li);
		scanf("%d", &ct);
		buf[li++] = ct;
	}
	return buf;
}
int main()
{	//2036,2137,0000,2035,3137,4133,2037,3036,2137,3136,2138,0000,2038,3136,3136,4129,2037,3338,3238,3137,4222,4024,0000,4031,0000,2038,3136,2138,4011,0000,1137,0000,4002,0000,4300,99,1,0,0,-1
	printf("\t\tSimpletron simulator.\n\n");
	printf("\t\t\tVersion 1.0\n\n");
	printf("\t\t\t\twinxos 2012/11/05\n\n\n");
	while (1)
	{
		loadCode(inputCode()); //calculate the code length
		runSML();
		showMemory();
	}
	return 0;
} //end