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array.c
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array.c
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/************************************************
array.c -
$Author$
$Date$
created at: Fri Aug 6 09:46:12 JST 1993
Copyright (C) 1993-1999 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
#include "util.h"
VALUE rb_cArray;
#define ARY_DEFAULT_SIZE 16
void
rb_mem_clear(mem, size)
register VALUE *mem;
register size_t size;
{
while (size--) {
*mem++ = Qnil;
}
}
static void
memfill(mem, size, val)
register VALUE *mem;
register size_t size;
register VALUE val;
{
while (size--) {
*mem++ = val;
}
}
#define ARY_FREEZE FL_USER1
#define ARY_TMPLOCK FL_USER2
static void
rb_ary_modify(ary)
VALUE ary;
{
if (FL_TEST(ary, ARY_FREEZE))
rb_raise(rb_eTypeError, "can't modify frozen array");
if (FL_TEST(ary, ARY_TMPLOCK))
rb_raise(rb_eTypeError, "can't modify array during sort");
if (!FL_TEST(ary, FL_TAINT) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't modify array");
}
VALUE
rb_ary_freeze(ary)
VALUE ary;
{
FL_SET(ary, ARY_FREEZE);
return ary;
}
static VALUE
rb_ary_frozen_p(ary)
VALUE ary;
{
if (FL_TEST(ary, ARY_FREEZE|ARY_TMPLOCK))
return Qtrue;
return Qfalse;
}
VALUE
rb_ary_new2(len)
long len;
{
NEWOBJ(ary, struct RArray);
OBJSETUP(ary, rb_cArray, T_ARRAY);
if (len < 0) {
rb_raise(rb_eArgError, "negative array size (or size too big)");
}
if (len > 0 && len*sizeof(VALUE) <= 0) {
rb_raise(rb_eArgError, "array size too big");
}
ary->len = 0;
ary->capa = len;
ary->ptr = 0;
if (len == 0) len++;
ary->ptr = ALLOC_N(VALUE, len);
return (VALUE)ary;
}
VALUE
rb_ary_new()
{
return rb_ary_new2(ARY_DEFAULT_SIZE);
}
#ifdef HAVE_STDARG_PROTOTYPES
#include <stdarg.h>
#define va_init_list(a,b) va_start(a,b)
#else
#include <varargs.h>
#define va_init_list(a,b) va_start(a)
#endif
VALUE
#ifdef HAVE_STDARG_PROTOTYPES
rb_ary_new3(long n, ...)
#else
rb_ary_new3(n, va_alist)
long n;
va_dcl
#endif
{
va_list ar;
VALUE ary;
long i;
if (n < 0) {
rb_raise(rb_eIndexError, "negative number of items(%d)", n);
}
ary = rb_ary_new2(n<ARY_DEFAULT_SIZE?ARY_DEFAULT_SIZE:n);
va_init_list(ar, n);
for (i=0; i<n; i++) {
RARRAY(ary)->ptr[i] = va_arg(ar, VALUE);
}
va_end(ar);
RARRAY(ary)->len = n;
return ary;
}
VALUE
rb_ary_new4(n, elts)
long n;
VALUE *elts;
{
VALUE ary;
ary = rb_ary_new2(n);
if (elts) {
MEMCPY(RARRAY(ary)->ptr, elts, VALUE, n);
}
RARRAY(ary)->len = n;
return ary;
}
VALUE
rb_assoc_new(car, cdr)
VALUE car, cdr;
{
VALUE ary;
ary = rb_ary_new2(2);
RARRAY(ary)->ptr[0] = car;
RARRAY(ary)->ptr[1] = cdr;
RARRAY(ary)->len = 2;
return ary;
}
static VALUE
rb_ary_s_new(argc, argv, klass)
int argc;
VALUE *argv;
VALUE klass;
{
long len = 0;
VALUE size, val;
NEWOBJ(ary, struct RArray);
OBJSETUP(ary, klass, T_ARRAY);
ary->len = 0;
ary->ptr = 0;
if (rb_scan_args(argc, argv, "02", &size, &val) == 0) {
ary->capa = ARY_DEFAULT_SIZE;
}
else {
long capa = NUM2LONG(size);
if (capa < 0) {
rb_raise(rb_eArgError, "negative array size");
}
if (capa > 0 && capa*sizeof(VALUE) <= 0) {
rb_raise(rb_eArgError, "array size too big");
}
ary->capa = capa;
len = capa;
}
ary->ptr = ALLOC_N(VALUE, ary->capa);
memfill(ary->ptr, len, val);
ary->len = len;
return (VALUE)ary;
}
static VALUE
rb_ary_s_create(argc, argv, klass)
int argc;
VALUE *argv;
VALUE klass;
{
NEWOBJ(ary, struct RArray);
OBJSETUP(ary, klass, T_ARRAY);
ary->len = ary->capa = 0;
if (argc == 0) {
ary->ptr = 0;
}
else {
ary->ptr = ALLOC_N(VALUE, argc);
MEMCPY(ary->ptr, argv, VALUE, argc);
}
ary->len = ary->capa = argc;
return (VALUE)ary;
}
void
rb_ary_store(ary, idx, val)
VALUE ary;
long idx;
VALUE val;
{
rb_ary_modify(ary);
if (idx < 0) {
idx += RARRAY(ary)->len;
if (idx < 0) {
rb_raise(rb_eIndexError, "index %d out of array",
idx - RARRAY(ary)->len);
}
}
if (idx >= RARRAY(ary)->capa) {
long capa_inc = RARRAY(ary)->capa / 2;
if (capa_inc < ARY_DEFAULT_SIZE) {
capa_inc = ARY_DEFAULT_SIZE;
}
RARRAY(ary)->capa = idx + capa_inc;
REALLOC_N(RARRAY(ary)->ptr, VALUE, RARRAY(ary)->capa);
}
if (idx > RARRAY(ary)->len) {
rb_mem_clear(RARRAY(ary)->ptr+RARRAY(ary)->len,
idx-RARRAY(ary)->len+1);
}
if (idx >= RARRAY(ary)->len) {
RARRAY(ary)->len = idx + 1;
}
RARRAY(ary)->ptr[idx] = val;
}
VALUE
rb_ary_push(ary, item)
VALUE ary;
VALUE item;
{
rb_ary_store(ary, RARRAY(ary)->len, item);
return ary;
}
static VALUE
rb_ary_push_method(argc, argv, ary)
int argc;
VALUE *argv;
VALUE ary;
{
while (argc--) {
rb_ary_store(ary, RARRAY(ary)->len, *argv++);
}
return ary;
}
VALUE
rb_ary_pop(ary)
VALUE ary;
{
rb_ary_modify(ary);
if (RARRAY(ary)->len == 0) return Qnil;
if (RARRAY(ary)->len * 10 < RARRAY(ary)->capa && RARRAY(ary)->capa > ARY_DEFAULT_SIZE) {
RARRAY(ary)->capa = RARRAY(ary)->len * 2;
REALLOC_N(RARRAY(ary)->ptr, VALUE, RARRAY(ary)->capa);
}
return RARRAY(ary)->ptr[--RARRAY(ary)->len];
}
VALUE
rb_ary_shift(ary)
VALUE ary;
{
VALUE top;
rb_ary_modify(ary);
if (RARRAY(ary)->len == 0) return Qnil;
top = RARRAY(ary)->ptr[0];
RARRAY(ary)->len--;
/* sliding items */
MEMMOVE(RARRAY(ary)->ptr, RARRAY(ary)->ptr+1, VALUE, RARRAY(ary)->len);
if (RARRAY(ary)->len * 10 < RARRAY(ary)->capa && RARRAY(ary)->capa > ARY_DEFAULT_SIZE) {
RARRAY(ary)->capa = RARRAY(ary)->len * 2;
REALLOC_N(RARRAY(ary)->ptr, VALUE, RARRAY(ary)->capa);
}
return top;
}
VALUE
rb_ary_unshift(ary, item)
VALUE ary, item;
{
rb_ary_modify(ary);
if (RARRAY(ary)->len >= RARRAY(ary)->capa) {
long capa_inc = RARRAY(ary)->capa / 2;
if (capa_inc < ARY_DEFAULT_SIZE) {
capa_inc = ARY_DEFAULT_SIZE;
}
RARRAY(ary)->capa+=capa_inc;
REALLOC_N(RARRAY(ary)->ptr, VALUE, RARRAY(ary)->capa);
}
/* sliding items */
MEMMOVE(RARRAY(ary)->ptr+1, RARRAY(ary)->ptr, VALUE, RARRAY(ary)->len);
RARRAY(ary)->len++;
RARRAY(ary)->ptr[0] = item;
return ary;
}
VALUE
rb_ary_entry(ary, offset)
VALUE ary;
long offset;
{
if (RARRAY(ary)->len == 0) return Qnil;
if (offset < 0) {
offset = RARRAY(ary)->len + offset;
}
if (offset < 0 || RARRAY(ary)->len <= offset) {
return Qnil;
}
return RARRAY(ary)->ptr[offset];
}
static VALUE
rb_ary_subary(ary, beg, len)
VALUE ary;
long beg, len;
{
VALUE ary2;
if (beg > RARRAY(ary)->len) return Qnil;
if (beg < 0) {
len += beg;
beg = 0;
}
if (len < 0) return Qnil;
if (beg + len > RARRAY(ary)->len) {
len = RARRAY(ary)->len - beg;
}
if (len < 0) {
len = 0;
}
if (len == 0) return rb_ary_new2(0);
ary2 = rb_ary_new2(len);
MEMCPY(RARRAY(ary2)->ptr, RARRAY(ary)->ptr+beg, VALUE, len);
RARRAY(ary2)->len = len;
return ary2;
}
VALUE
rb_ary_aref(argc, argv, ary)
int argc;
VALUE *argv;
VALUE ary;
{
VALUE arg1, arg2;
long beg, len;
if (rb_scan_args(argc, argv, "11", &arg1, &arg2) == 2) {
beg = NUM2LONG(arg1);
len = NUM2LONG(arg2);
if (beg < 0) {
beg = RARRAY(ary)->len + beg;
}
return rb_ary_subary(ary, beg, len);
}
/* special case - speeding up */
if (FIXNUM_P(arg1)) {
return rb_ary_entry(ary, FIX2LONG(arg1));
}
else if (TYPE(arg1) == T_BIGNUM) {
rb_raise(rb_eIndexError, "index too big");
}
else {
/* check if idx is Range */
switch (rb_range_beg_len(arg1, &beg, &len, RARRAY(ary)->len, 0)) {
case Qfalse:
break;
case Qnil:
return Qnil;
default:
return rb_ary_subary(ary, beg, len);
}
}
return rb_ary_entry(ary, NUM2LONG(arg1));
}
static VALUE
rb_ary_at(ary, pos)
VALUE ary, pos;
{
return rb_ary_entry(ary, NUM2LONG(pos));
}
static VALUE
rb_ary_first(ary)
VALUE ary;
{
if (RARRAY(ary)->len == 0) return Qnil;
return RARRAY(ary)->ptr[0];
}
static VALUE
rb_ary_last(ary)
VALUE ary;
{
if (RARRAY(ary)->len == 0) return Qnil;
return RARRAY(ary)->ptr[RARRAY(ary)->len-1];
}
static VALUE
rb_ary_index(ary, val)
VALUE ary;
VALUE val;
{
long i;
for (i=0; i<RARRAY(ary)->len; i++) {
if (rb_equal(RARRAY(ary)->ptr[i], val))
return INT2NUM(i);
}
return Qnil;
}
static VALUE
rb_ary_rindex(ary, val)
VALUE ary;
VALUE val;
{
long i = RARRAY(ary)->len;
while (i--) {
if (rb_equal(RARRAY(ary)->ptr[i], val))
return INT2NUM(i);
}
return Qnil;
}
static VALUE
rb_ary_indexes(argc, argv, ary)
int argc;
VALUE *argv;
VALUE ary;
{
VALUE new_ary;
long i;
new_ary = rb_ary_new2(argc);
for (i=0; i<argc; i++) {
rb_ary_push(new_ary, rb_ary_aref(1, argv+i, ary));
}
return new_ary;
}
static void
rb_ary_replace(ary, beg, len, rpl)
VALUE ary, rpl;
long beg, len;
{
if (len < 0) rb_raise(rb_eIndexError, "negative length %d", len);
if (beg < 0) {
beg += RARRAY(ary)->len;
}
if (beg < 0) {
beg -= RARRAY(ary)->len;
rb_raise(rb_eIndexError, "index %d out of array", beg);
}
if (beg + len > RARRAY(ary)->len) {
len = RARRAY(ary)->len - beg;
}
if (TYPE(rpl) != T_ARRAY) {
rpl = rb_Array(rpl);
}
rb_ary_modify(ary);
if (beg >= RARRAY(ary)->len) {
len = beg + RARRAY(rpl)->len;
if (len >= RARRAY(ary)->capa) {
RARRAY(ary)->capa=len;
REALLOC_N(RARRAY(ary)->ptr, VALUE, RARRAY(ary)->capa);
}
rb_mem_clear(RARRAY(ary)->ptr+RARRAY(ary)->len, beg-RARRAY(ary)->len);
MEMCPY(RARRAY(ary)->ptr+beg, RARRAY(rpl)->ptr, VALUE, RARRAY(rpl)->len);
RARRAY(ary)->len = len;
}
else {
long alen;
if (beg + len > RARRAY(ary)->len) {
len = RARRAY(ary)->len - beg;
}
alen = RARRAY(ary)->len + RARRAY(rpl)->len - len;
if (alen >= RARRAY(ary)->capa) {
RARRAY(ary)->capa=alen;
REALLOC_N(RARRAY(ary)->ptr, VALUE, RARRAY(ary)->capa);
}
if (len != RARRAY(rpl)->len) {
MEMMOVE(RARRAY(ary)->ptr+beg+RARRAY(rpl)->len, RARRAY(ary)->ptr+beg+len,
VALUE, RARRAY(ary)->len-(beg+len));
RARRAY(ary)->len = alen;
}
MEMCPY(RARRAY(ary)->ptr+beg, RARRAY(rpl)->ptr, VALUE, RARRAY(rpl)->len);
}
}
static VALUE
rb_ary_aset(argc, argv, ary)
int argc;
VALUE *argv;
VALUE ary;
{
VALUE arg1, arg2, arg3;
long offset, beg, len;
if (rb_scan_args(argc, argv, "21", &arg1, &arg2, &arg3) == 3) {
rb_ary_replace(ary, NUM2LONG(arg1), NUM2LONG(arg2), arg3);
return arg3;
}
else if (FIXNUM_P(arg1)) {
offset = FIX2LONG(arg1);
goto fixnum;
}
else if (rb_range_beg_len(arg1, &beg, &len, RARRAY(ary)->len, 1)) {
/* check if idx is Range */
rb_ary_replace(ary, beg, len, arg2);
return arg2;
}
if (TYPE(arg1) == T_BIGNUM) {
rb_raise(rb_eIndexError, "index too big");
}
offset = NUM2LONG(arg1);
fixnum:
rb_ary_store(ary, offset, arg2);
return arg2;
}
VALUE
rb_ary_each(ary)
VALUE ary;
{
long i;
for (i=0; i<RARRAY(ary)->len; i++) {
rb_yield(RARRAY(ary)->ptr[i]);
}
return ary;
}
static VALUE
rb_ary_each_index(ary)
VALUE ary;
{
long i;
for (i=0; i<RARRAY(ary)->len; i++) {
rb_yield(INT2NUM(i));
}
return ary;
}
static VALUE
rb_ary_reverse_each(ary)
VALUE ary;
{
long len = RARRAY(ary)->len;
while (len--) {
rb_yield(RARRAY(ary)->ptr[len]);
}
return ary;
}
static VALUE
rb_ary_length(ary)
VALUE ary;
{
return INT2NUM(RARRAY(ary)->len);
}
static VALUE
rb_ary_empty_p(ary)
VALUE ary;
{
if (RARRAY(ary)->len == 0)
return Qtrue;
return Qfalse;
}
static VALUE
rb_ary_clone(ary)
VALUE ary;
{
VALUE ary2 = rb_ary_new2(RARRAY(ary)->len);
CLONESETUP(ary2, ary);
MEMCPY(RARRAY(ary2)->ptr, RARRAY(ary)->ptr, VALUE, RARRAY(ary)->len);
RARRAY(ary2)->len = RARRAY(ary)->len;
return ary2;
}
static VALUE
rb_ary_dup(ary)
VALUE ary;
{
return rb_ary_s_create(RARRAY(ary)->len, RARRAY(ary)->ptr, CLASS_OF(ary));
}
static VALUE
to_ary(ary)
VALUE ary;
{
return rb_convert_type(ary, T_ARRAY, "Array", "to_ary");
}
extern VALUE rb_output_fs;
static VALUE
inspect_join(ary, arg)
VALUE ary;
VALUE *arg;
{
return rb_ary_join(arg[0], arg[1]);
}
VALUE
rb_ary_join(ary, sep)
VALUE ary, sep;
{
long i;
VALUE result, tmp;
if (RARRAY(ary)->len == 0) return rb_str_new(0, 0);
tmp = RARRAY(ary)->ptr[0];
switch (TYPE(tmp)) {
case T_STRING:
result = rb_str_dup(tmp);
break;
case T_ARRAY:
if (rb_inspecting_p(tmp)) {
result = rb_str_new2("[...]");
}
else {
VALUE args[2];
args[0] = tmp;
args[1] = sep;
result = rb_protect_inspect(inspect_join, ary, (VALUE)args);
}
break;
default:
result = rb_obj_as_string(tmp);
break;
}
for (i=1; i<RARRAY(ary)->len; i++) {
tmp = RARRAY(ary)->ptr[i];
switch (TYPE(tmp)) {
case T_STRING:
break;
case T_ARRAY:
if (rb_inspecting_p(tmp)) {
tmp = rb_str_new2("[...]");
}
else {
VALUE args[2];
args[0] = tmp;
args[1] = sep;
tmp = rb_protect_inspect(inspect_join, ary, (VALUE)args);
}
break;
default:
tmp = rb_obj_as_string(tmp);
}
if (!NIL_P(sep)) rb_str_concat(result, sep);
rb_str_cat(result, RSTRING(tmp)->ptr, RSTRING(tmp)->len);
if (OBJ_TAINTED(tmp)) OBJ_TAINT(result);
}
return result;
}
static VALUE
rb_ary_join_method(argc, argv, ary)
int argc;
VALUE *argv;
VALUE ary;
{
VALUE sep;
rb_scan_args(argc, argv, "01", &sep);
if (NIL_P(sep)) sep = rb_output_fs;
return rb_ary_join(ary, sep);
}
VALUE
rb_ary_to_s(ary)
VALUE ary;
{
VALUE str;
if (RARRAY(ary)->len == 0) return rb_str_new(0, 0);
str = rb_ary_join(ary, rb_output_fs);
if (NIL_P(str)) return rb_str_new(0, 0);
return str;
}
static ID inspect_key;
struct inspect_arg {
VALUE (*func)();
VALUE arg1, arg2;
};
VALUE
inspect_call(arg)
struct inspect_arg *arg;
{
return (*arg->func)(arg->arg1, arg->arg2);
}
static VALUE
inspect_ensure(obj)
VALUE obj;
{
VALUE inspect_tbl;
inspect_tbl = rb_thread_local_aref(rb_thread_current(), inspect_key);
rb_ary_pop(inspect_tbl);
return 0;
}
VALUE
rb_protect_inspect(func, obj, arg)
VALUE (*func)();
VALUE obj, arg;
{
struct inspect_arg iarg;
VALUE inspect_tbl;
if (!inspect_key) {
inspect_key = rb_intern("__inspect_key__");
}
inspect_tbl = rb_thread_local_aref(rb_thread_current(), inspect_key);
if (NIL_P(inspect_tbl)) {
inspect_tbl = rb_ary_new();
rb_thread_local_aset(rb_thread_current(), inspect_key, inspect_tbl);
}
rb_ary_push(inspect_tbl, obj);
iarg.func = func;
iarg.arg1 = obj;
iarg.arg2 = arg;
return rb_ensure(inspect_call, (VALUE)&iarg, inspect_ensure, obj);
}
VALUE
rb_inspecting_p(obj)
VALUE obj;
{
VALUE inspect_tbl;
if (!inspect_key) return Qfalse;
inspect_tbl = rb_thread_local_aref(rb_thread_current(), inspect_key);
if (NIL_P(inspect_tbl)) return Qfalse;
return rb_ary_includes(inspect_tbl, obj);
}
static VALUE
inspect_ary(ary)
VALUE ary;
{
long i = 0;
VALUE s, str;
str = rb_str_new2("[");
for (i=0; i<RARRAY(ary)->len; i++) {
s = rb_inspect(RARRAY(ary)->ptr[i]);
if (i > 0) rb_str_cat(str, ", ", 2);
rb_str_cat(str, RSTRING(s)->ptr, RSTRING(s)->len);
}
rb_str_cat(str, "]", 1);
return str;
}
static VALUE
rb_ary_inspect(ary)
VALUE ary;
{
if (RARRAY(ary)->len == 0) return rb_str_new2("[]");
if (rb_inspecting_p(ary)) return rb_str_new2("[...]");
return rb_protect_inspect(inspect_ary, ary, 0);
}
static VALUE
rb_ary_to_a(ary)
VALUE ary;
{
return ary;
}
VALUE
rb_ary_reverse(ary)
VALUE ary;
{
VALUE *p1, *p2;
VALUE tmp;
rb_ary_modify(ary);
if (RARRAY(ary)->len == 0) return ary;
p1 = RARRAY(ary)->ptr;
p2 = p1 + RARRAY(ary)->len - 1; /* points last item */
while (p1 < p2) {
tmp = *p1;
*p1 = *p2;
*p2 = tmp;
p1++; p2--;
}
return ary;
}
static VALUE
rb_ary_reverse_method(ary)
VALUE ary;
{
return rb_ary_reverse(rb_ary_dup(ary));
}
static ID cmp;
static int
sort_1(a, b)
VALUE *a, *b;
{
VALUE retval = rb_yield(rb_assoc_new(*a, *b));
return NUM2INT(retval);
}
static int
sort_2(a, b)
VALUE *a, *b;
{
VALUE retval;
if (FIXNUM_P(*a)) {
if (FIXNUM_P(*b)) return *a - *b;
}
else if (TYPE(*a) == T_STRING && TYPE(*b) == T_STRING) {
return rb_str_cmp(*a, *b);
}
retval = rb_funcall(*a, cmp, 1, *b);
return NUM2INT(retval);
}
static VALUE
sort_internal(ary)
VALUE ary;
{
qsort(RARRAY(ary)->ptr, RARRAY(ary)->len, sizeof(VALUE),
rb_iterator_p()?sort_1:sort_2);
return ary;
}
static VALUE
sort_unlock(ary)
VALUE ary;
{
FL_UNSET(ary, ARY_TMPLOCK);
return ary;
}
VALUE
rb_ary_sort_bang(ary)
VALUE ary;
{
rb_ary_modify(ary);
if (RARRAY(ary)->len <= 1) return ary;
FL_SET(ary, ARY_TMPLOCK); /* prohibit modification during sort */
rb_ensure(sort_internal, ary, sort_unlock, ary);
return ary;
}
VALUE
rb_ary_sort(ary)
VALUE ary;
{
ary = rb_ary_dup(ary);
rb_ary_sort_bang(ary);
return ary;
}
static VALUE
rb_ary_collect(ary)
VALUE ary;
{
long len, i;
VALUE collect;
if (!rb_iterator_p()) {
return rb_ary_dup(ary);
}
len = RARRAY(ary)->len;
collect = rb_ary_new2(len);
for (i=0; i<len; i++) {
rb_ary_push(collect, rb_yield(RARRAY(ary)->ptr[i]));
}
return collect;
}
VALUE
rb_ary_delete(ary, item)
VALUE ary;
VALUE item;
{
long i1, i2;
rb_ary_modify(ary);
for (i1 = i2 = 0; i1 < RARRAY(ary)->len; i1++) {
if (rb_equal(RARRAY(ary)->ptr[i1], item)) continue;
if (i1 != i2) {
RARRAY(ary)->ptr[i2] = RARRAY(ary)->ptr[i1];
}
i2++;
}
if (RARRAY(ary)->len == i2) {
if (rb_iterator_p()) {
return rb_yield(item);
}
return Qnil;
}
else {
RARRAY(ary)->len = i2;
}
return item;
}
VALUE
rb_ary_delete_at(ary, at)
VALUE ary;
VALUE at;
{
long i, pos = NUM2LONG(at), len = RARRAY(ary)->len;
VALUE del = Qnil;
rb_ary_modify(ary);
if (pos >= len) return Qnil;
if (pos < 0) pos += len;
if (pos < 0) return Qnil;
del = RARRAY(ary)->ptr[pos];
for (i = pos + 1; i < len; i++, pos++) {
RARRAY(ary)->ptr[pos] = RARRAY(ary)->ptr[i];
}