uxn-utils/ref/uxnmin.c

#include <stdio.h>

typedef unsigned char Uint8;
typedef signed char Sint8;
typedef unsigned short Uint16;

typedef struct {
	Uint8 dat[0x100], ptr;
} Stack;

typedef struct Uxn {
	Uint8 ram[0x10000], dev[0x100];
	Stack wst, rst;
} Uxn;

int uxn_eval(Uxn *u, Uint16 pc);

Uint8
emu_dei(Uxn *u, Uint8 addr)
{
	return u->dev[addr];
}

void
emu_deo(Uxn *u, Uint8 addr, Uint8 value)
{
	u->dev[addr] = value;
	switch(addr) {
	case 0x18: fputc(u->dev[0x18], stdout), fflush(stdout); return;
	case 0x19: fputc(u->dev[0x19], stderr), fflush(stderr); return;
	}
}

#define FLIP     { s = ins & 0x40 ? &u->wst : &u->rst; }
#define JUMP(x)  { if(m2) pc = (x); else pc += (Sint8)(x); }
#define POP1(o)  { o = s->dat[--*sp]; }
#define POP2(o)  { o = s->dat[--*sp] | (s->dat[--*sp] << 0x8); }
#define POPx(o)  { if(m2) { POP2(o) } else POP1(o) }
#define PUSH1(y) { s->dat[s->ptr++] = (y); }
#define PUSH2(y) { tt = (y); s->dat[s->ptr++] = tt >> 0x8; s->dat[s->ptr++] = tt; }
#define PUSHx(y) { if(m2) { PUSH2(y) } else PUSH1(y) }
#define PEEK(o, x, r) { if(m2) { r = (x); o = ram[r++] << 8 | ram[r]; } else o = ram[(x)]; }
#define POKE(x, y, r) { if(m2) { r = (x); ram[r++] = y >> 8; ram[r] = y; } else ram[(x)] = (y); }
#define DEVR(o, p)    { if(m2) { o = (emu_dei(u, p) << 8) | emu_dei(u, p + 1); } else o = emu_dei(u, p); }
#define DEVW(p, y)    { if(m2) { emu_deo(u, p, y >> 8); emu_deo(u, p + 1, y); } else emu_deo(u, p, y); }
#define next { ins = ram[pc++]; \
	m2 = ins & 0x20; \
	s = ins & 0x40 ? &u->rst : &u->wst; \
	if(ins & 0x80) kp = s->ptr, sp = &kp; else sp = &s->ptr; \
	goto *lut[ins & 0x1f]; }

int
uxn_eval(Uxn *u, Uint16 pc)
{
	Uint8 t, kp, *sp, ins, m2, *ram = u->ram;
	Uint16 tt, a, b, c;
	Stack *s;
	static void* lut[] = {
		&&_imm, &&_inc, &&_pop, &&_nip, &&_swp, &&_rot, &&_dup, &&_ovr,
		&&_equ, &&_neq, &&_gth, &&_lth, &&_jmp, &&_jcn, &&_jsr, &&_sth,
		&&_ldz, &&_stz, &&_ldr, &&_str, &&_lda, &&_sta, &&_dei, &&_deo,
		&&_add, &&_sub, &&_mul, &&_div, &&_and, &&_ora, &&_eor, &&_sft };
	if(!pc || u->dev[0x0f]) return 0;
	next
	_imm: 
		switch(ins) {
			case 0x00: /* BRK */ return 1;
			case 0x20: /* JCI */ POP1(b) if(!b) { pc += 2; break; }
			case 0x40: /* JMI */ a = ram[pc++] << 8 | ram[pc++]; pc += a; break;
			case 0x60: /* JSI */ PUSH2(pc + 2) a = ram[pc++] << 8 | ram[pc++]; pc += a; break;
			case 0x80: case 0xc0: /* LIT  */ PUSH1(ram[pc++]) break;
			case 0xa0: case 0xe0: /* LIT2 */ PUSH1(ram[pc++]) PUSH1(ram[pc++]) break;
		} next
	_inc: POPx(a) PUSHx(a + 1) next
	_pop: POPx(a) next
	_nip: POPx(a) POPx(b) PUSHx(a) next
	_swp: POPx(a) POPx(b) PUSHx(a) PUSHx(b) next
	_rot: POPx(a) POPx(b) POPx(c) PUSHx(b) PUSHx(a) PUSHx(c) next
	_dup: POPx(a) PUSHx(a) PUSHx(a) next
	_ovr: POPx(a) POPx(b) PUSHx(b) PUSHx(a) PUSHx(b) next
	_equ: POPx(a) POPx(b) PUSH1(b == a) next
	_neq: POPx(a) POPx(b) PUSH1(b != a) next
	_gth: POPx(a) POPx(b) PUSH1(b > a) next
	_lth: POPx(a) POPx(b) PUSH1(b < a) next
	_jmp: POPx(a) JUMP(a) next
	_jcn: POPx(a) POP1(b) if(b) JUMP(a) next
	_jsr: POPx(a) FLIP PUSH2(pc) JUMP(a) next
	_sth: POPx(a) FLIP PUSHx(a) next
	_ldz: POP1(a) PEEK(b, a, t) PUSHx(b) next
	_stz: POP1(a) POPx(b) POKE(a, b, t) next
	_ldr: POP1(a) PEEK(b, pc + (Sint8)a, tt) PUSHx(b) next
	_str: POP1(a) POPx(b) POKE(pc + (Sint8)a, b, tt) next
	_lda: POP2(a) PEEK(b, a, tt) PUSHx(b) next
	_sta: POP2(a) POPx(b) POKE(a, b, tt) next
	_dei: POP1(a) DEVR(b, a) PUSHx(b) next
	_deo: POP1(a) POPx(b) DEVW(a, b) next
	_add: POPx(a) POPx(b) PUSHx(b + a) next
	_sub: POPx(a) POPx(b) PUSHx(b - a) next
	_mul: POPx(a) POPx(b) PUSHx(b * a) next
	_div: POPx(a) POPx(b) PUSHx(a ? b / a : 0) next
	_and: POPx(a) POPx(b) PUSHx(b & a) next
	_ora: POPx(a) POPx(b) PUSHx(b | a) next
	_eor: POPx(a) POPx(b) PUSHx(b ^ a) next
	_sft: POP1(a) POPx(b) PUSHx(b >> (a & 0xf) << (a >> 4)) next
}

void
console_input(Uxn *u, char c, int type)
{
	u->dev[0x12] = c, u->dev[0x17] = type;
	uxn_eval(u, u->dev[0x10] << 8 | u->dev[0x11]);
}

int
main(int argc, char **argv)
{
	FILE *f;
	int i = 1;
	Uxn u = {0};
	if(argc < 2) {
		fprintf(stdout, "usage: %s file.rom [args..]\n", argv[0]);
		return 0;
	}
	f = fopen(argv[i++], "rb");
	if(!f) {
		fprintf(stderr, "uxnmin: Error %s\n", argv[1]);
		return 0;
	}
	u.dev[0x17] = argc - i;
	fread(&u.ram[0x0100], 0xff00, 1, f), fclose(f);
	if(uxn_eval(&u, 0x0100) && (u.dev[0x10] << 8 | u.dev[0x11])) {
		for(; i < argc; i++) {
			char *p = argv[i];
			while(*p) console_input(&u, *p++, 0x2);
			console_input(&u, '\n', i == argc - 1 ? 0x4 : 0x3);
		}
		while(!u.dev[0x0f]) {
			int c = fgetc(stdin);
			if(c == EOF) {
				console_input(&u, 0x00, 0x4);
				break;
			}
			console_input(&u, (Uint8)c, 0x1);
		}
	}
	return u.dev[0x0f] & 0x7f;
}