Yet another DCPU16 assembler

gistfile1.c

#include <stdio.h>
#include <string.h>

unsigned short out[100], *curr, *next;

const char *regs[] = {
	"a", "b", "c", "x",
	"y", "z", "i", "j"
};

int val(char *va)
{
	for (int i=0; i<8; i++)
		if (!strcmp(regs[i], va))
			return i;

	return 0;
}

const char *instrs[] = {
	"", "SET", "ADD", "SUB",
	"MUL", "DIV", "MOD", "SHL",
	"SHR", "AND", "BOR", "XOR",
	"IFE", "IFN", "IFG", "IFB"
};

int instr(const char *vi)
{
	for (int i=0; i<16; i++)
		if (!strcmp(instrs[i], vi))
			return i;

	return 0;
}

void assemble(char *line)
{
	char *vi = strsep(&line, " ");
	char *va = strsep(&line, ",");
	char *vb = strsep(&line, "\n");

	curr = next++;

	int n = instr(vi);
	n |= val(va) << 4;
	n |= val(vb) << 12;

	*curr = n;
}

int main()
{
	next = out;

	char buf[100];

	while (gets(buf) != 0) {
		assemble(buf);
	}

	for (unsigned short *p = out; p != next; p++) {
		printf("%04x ", *p);
	}
	puts("");

	return 0;
}