int main(void)
{
char A[] = "1c0111001f010100061a024b53535009181c";
char B[] = "686974207468652062756c6c277320657965";
size_t size = strlen(A) / 2;
char buf[128], xor[128];
hex_to_bin(A, A);
hex_to_bin(B, B);
printf("A ^ B = \"%s\"\n", bin_to_hex(buf, str_xor(xor, A, B, size), size));
return 0;
}
static Extype_t
eval(Expr_t* ex, register Exnode_t* expr, void* env)
{
register Exnode_t* x;
register Exnode_t* a;
register Extype_t** t;
register int n;
Extype_t v;
Extype_t r;
Extype_t i;
char* e;
Exnode_t tmp;
Exassoc_t* assoc;
Extype_t args[FRAME+1];
Extype_t save[FRAME];
if (!expr || ex->loopcount)
{
v.integer = 1;
return v;
}
x = expr->data.operand.left;
switch (expr->op)
{
case BREAK:
case CONTINUE:
v = eval(ex, x, env);
ex->loopcount = v.integer;
ex->loopop = expr->op;
return v;
case CONSTANT:
return expr->data.constant.value;
case DEC:
n = -1;
add:
if (x->op == DYNAMIC)
r = getdyn(ex, x, env, &assoc);
else
{
if (x->data.variable.index)
i = eval(ex, x->data.variable.index, env);
else
i.integer = EX_SCALAR;
r = (*ex->disc->getf)(ex, x, x->data.variable.symbol, x->data.variable.reference, env, (int)i.integer, ex->disc);
}
v = r;
switch (x->type)
{
case FLOATING:
v.floating += n;
break;
case INTEGER:
case UNSIGNED:
v.integer += n;
break;
default:
goto huh;
}
set:
if (x->op == DYNAMIC)
{
if (x->type == STRING)
{
v.string = vmstrdup(ex->vm, v.string);
if (e = assoc ? assoc->value.string : x->data.variable.symbol->value->data.constant.value.string)
vmfree(ex->vm, e);
}
if (assoc)
assoc->value = v;
else
x->data.variable.symbol->value->data.constant.value = v;
}
else
{
if (x->data.variable.index)
i = eval(ex, x->data.variable.index, env);
else
i.integer = EX_SCALAR;
if ((*ex->disc->setf)(ex, x, x->data.variable.symbol, x->data.variable.reference, env, (int)i.integer, v, ex->disc) < 0)
exerror("%s: cannot set value", x->data.variable.symbol->name);
}
if (expr->subop == PRE)
r = v;
return r;
case DYNAMIC:
return getdyn(ex, expr, env, &assoc);
case EXIT:
v = eval(ex, x, env);
exit((int)v.integer);
/*NOTREACHED*/
v.integer = -1;
return v;
case IF:
v = eval(ex, x, env);
if (v.integer)
eval(ex, expr->data.operand.right->data.operand.left, env);
else
eval(ex, expr->data.operand.right->data.operand.right, env);
v.integer = 1;
return v;
case FOR:
case WHILE:
expr = expr->data.operand.right;
for (;;)
{
r = eval(ex, x, env);
if (!r.integer)
{
v.integer = 1;
return v;
}
if (expr->data.operand.right)
{
eval(ex, expr->data.operand.right, env);
if (ex->loopcount > 0 && (--ex->loopcount > 0 || ex->loopop != CONTINUE))
{
v.integer = 0;
return v;
}
}
if (expr->data.operand.left)
eval(ex, expr->data.operand.left, env);
}
/*NOTREACHED*/
case SWITCH:
v = eval(ex, x, env);
i.integer = x->type;
r.integer = 0;
x = expr->data.operand.right;
a = x->data.select.statement;
n = 0;
while (x = x->data.select.next)
{
if (!(t = x->data.select.constant))
n = 1;
else
for (; *t; t++)
{
switch ((int)i.integer)
{
case INTEGER:
case UNSIGNED:
if ((*t)->integer == v.integer)
break;
continue;
case STRING:
if ((ex->disc->version >= 19981111L && ex->disc->matchf) ? (*ex->disc->matchf)(ex, x, (*t)->string, expr->data.operand.left, v.string, env, ex->disc) : strmatch((*t)->string, v.string))
break;
continue;
case FLOATING:
if ((*t)->floating == v.floating)
break;
continue;
}
n = 1;
break;
}
if (n)
{
if (!x->data.select.statement)
{
r.integer = 1;
break;
}
r = eval(ex, x->data.select.statement, env);
if (ex->loopcount > 0)
{
ex->loopcount--;
break;
}
}
}
if (!n && a)
{
r = eval(ex, a, env);
if (ex->loopcount > 0)
ex->loopcount--;
}
return r;
case ITERATE:
v.integer = 0;
if (expr->data.generate.array->op == DYNAMIC)
{
n = expr->data.generate.index->type == STRING;
for (assoc = (Exassoc_t*)dtfirst((Dt_t*)expr->data.generate.array->data.variable.symbol->local.pointer); assoc; assoc = (Exassoc_t*)dtnext((Dt_t*)expr->data.generate.array->data.variable.symbol->local.pointer, assoc))
{
v.integer++;
if (n)
expr->data.generate.index->value->data.constant.value.string = assoc->name;
else
expr->data.generate.index->value->data.constant.value.integer = strtol(assoc->name, NiL, 0);
eval(ex, expr->data.generate.statement, env);
if (ex->loopcount > 0 && (--ex->loopcount > 0 || ex->loopop != CONTINUE))
{
v.integer = 0;
break;
}
}
}
else
{
r = (*ex->disc->getf)(ex, expr, expr->data.generate.array->data.variable.symbol, expr->data.generate.array->data.variable.reference, env, 0, ex->disc);
for (v.integer = 0; v.integer < r.integer; v.integer++)
{
expr->data.generate.index->value->data.constant.value.integer = v.integer;
eval(ex, expr->data.generate.statement, env);
if (ex->loopcount > 0 && (--ex->loopcount > 0 || ex->loopop != CONTINUE))
{
v.integer = 0;
break;
}
}
}
return v;
case CALL:
x = expr->data.call.args;
for (n = 0, a = expr->data.call.procedure->value->data.procedure.args; a && x; a = a->data.operand.right)
{
if (n < elementsof(args))
{
save[n] = a->data.operand.left->data.variable.symbol->value->data.constant.value;
args[n++] = eval(ex, x->data.operand.left, env);
}
else
a->data.operand.left->data.variable.symbol->value->data.constant.value = eval(ex, x->data.operand.left, env);
x = x->data.operand.right;
}
for (n = 0, a = expr->data.call.procedure->value->data.procedure.args; a && n < elementsof(save); a = a->data.operand.right)
a->data.operand.left->data.variable.symbol->value->data.constant.value = args[n++];
if (x)
exerror("too many actual args");
else if (a)
exerror("not enough actual args");
v = exeval(ex, expr->data.call.procedure->value->data.procedure.body, env);
for (n = 0, a = expr->data.call.procedure->value->data.procedure.args; a && n < elementsof(save); a = a->data.operand.right)
a->data.operand.left->data.variable.symbol->value->data.constant.value = save[n++];
return v;
case FUNCTION:
n = 0;
args[n++].string = (char*)env;
for (x = expr->data.operand.right; x && n < elementsof(args); x = x->data.operand.right)
args[n++] = eval(ex, x->data.operand.left, env);
return (*ex->disc->getf)(ex, expr->data.operand.left, expr->data.operand.left->data.variable.symbol, expr->data.operand.left->data.variable.reference, args+1, EX_CALL, ex->disc);
case ID:
if (expr->data.variable.index)
i = eval(ex, expr->data.variable.index, env);
else
i.integer = EX_SCALAR;
return (*ex->disc->getf)(ex, expr, expr->data.variable.symbol, expr->data.variable.reference, env, (int)i.integer, ex->disc);
case INC:
n = 1;
goto add;
case PRINTF:
v.integer = print(ex, expr, env, NiL);
return v;
case QUERY:
print(ex, expr, env, sfstderr);
v.integer = !astquery(2, "");
return v;
case RETURN:
ex->loopret = eval(ex, x, env);
ex->loopcount = 32767;
ex->loopop = expr->op;
return ex->loopret;
case SCANF:
case SSCANF:
v.integer = scan(ex, expr, env, NiL);
return v;
case SPRINTF:
print(ex, expr, env, ex->tmp);
v.string = exstash(ex->tmp, ex->ve);
return v;
case '=':
v = eval(ex, expr->data.operand.right, env);
if (expr->subop != '=')
{
r = v;
if (x->op == DYNAMIC)
v = getdyn(ex, x, env, &assoc);
else
{
if (x->data.variable.index)
v = eval(ex, x->data.variable.index, env);
else
v.integer = EX_SCALAR;
v = (*ex->disc->getf)(ex, x, x->data.variable.symbol, x->data.variable.reference, env, (int)v.integer, ex->disc);
}
switch (x->type)
{
case FLOATING:
switch (expr->subop)
{
case '+':
v.floating += r.floating;
break;
case '-':
v.floating -= r.floating;
break;
case '*':
v.floating *= r.floating;
break;
case '/':
if (r.floating == 0.0)
exerror("floating divide by 0");
else
v.floating /= r.floating;
break;
case '%':
if ((r.integer = r.floating) == 0)
exerror("floating 0 modulus");
else
v.floating = ((Sflong_t)v.floating) % r.integer;
break;
case '&':
v.floating = ((Sflong_t)v.floating) & ((Sflong_t)r.floating);
break;
case '|':
v.floating = ((Sflong_t)v.floating) | ((Sflong_t)r.floating);
break;
case '^':
v.floating = ((Sflong_t)v.floating) ^ ((Sflong_t)r.floating);
break;
case LS:
v.floating = ((Sflong_t)v.floating) << ((Sflong_t)r.floating);
break;
case RS:
#if _WIN32
v.floating = (Sflong_t)(((Sfulong_t)v.floating) >> ((Sflong_t)r.floating));
#else
v.floating = ((Sfulong_t)v.floating) >> ((Sflong_t)r.floating);
#endif
break;
default:
goto huh;
}
break;
case INTEGER:
case UNSIGNED:
switch (expr->subop)
{
case '+':
v.integer += r.integer;
break;
case '-':
v.integer -= r.integer;
break;
case '*':
v.integer *= r.integer;
break;
case '/':
if (r.integer == 0)
exerror("integer divide by 0");
else
v.integer /= r.integer;
break;
case '%':
if (r.integer == 0)
exerror("integer 0 modulus");
else
v.integer %= r.integer;
break;
case '&':
v.integer &= r.integer;
break;
case '|':
v.integer |= r.integer;
break;
case '^':
v.integer ^= r.integer;
break;
case LS:
v.integer <<= r.integer;
break;
case RS:
v.integer = (Sfulong_t)v.integer >> r.integer;
break;
default:
goto huh;
}
break;
case STRING:
switch (expr->subop)
{
case '+':
v.string = str_add(ex, v.string, r.string);
break;
case '|':
v.string = str_ior(ex, v.string, r.string);
break;
case '&':
v.string = str_and(ex, v.string, r.string);
break;
case '^':
v.string = str_xor(ex, v.string, r.string);
break;
case '%':
v.string = str_mod(ex, v.string, r.string);
break;
case '*':
v.string = str_mpy(ex, v.string, r.string);
break;
default:
goto huh;
}
break;
default:
goto huh;
}
}
else if (x->op == DYNAMIC)
