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ruby--ruby/ext/dl/cptr.c

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/* -*- C -*-
* $Id$
*/
#include <ruby.h>
#include <rubyio.h>
#include <ctype.h>
#include <version.h> /* for ruby version code */
#include "dl.h"
VALUE rb_cDLCPtr;
static ID id_to_ptr;
static void
dlptr_free(struct ptr_data *data)
{
if (data->ptr) {
if (data->free) {
(*(data->free))(data->ptr);
}
}
}
static void
dlptr_mark(struct ptr_data *data)
{
}
void
dlptr_init(VALUE val)
{
struct ptr_data *data;
Data_Get_Struct(val, struct ptr_data, data);
OBJ_TAINT(val);
}
VALUE
rb_dlptr_new2(VALUE klass, void *ptr, long size, freefunc_t func)
{
struct ptr_data *data;
VALUE val;
rb_secure(4);
val = Data_Make_Struct(klass, struct ptr_data,
0, dlptr_free, data);
data->ptr = ptr;
data->free = func;
data->size = size;
dlptr_init(val);
return val;
}
VALUE
rb_dlptr_new(void *ptr, long size, freefunc_t func)
{
return rb_dlptr_new2(rb_cDLCPtr, ptr, size, func);
}
VALUE
rb_dlptr_malloc(long size, freefunc_t func)
{
void *ptr;
rb_secure(4);
ptr = ruby_xmalloc((size_t)size);
memset(ptr,0,(size_t)size);
return rb_dlptr_new(ptr, size, func);
}
void *
rb_dlptr2cptr(VALUE val)
{
struct ptr_data *data;
void *ptr;
if (rb_obj_is_kind_of(val, rb_cDLCPtr)) {
Data_Get_Struct(val, struct ptr_data, data);
ptr = data->ptr;
}
else if (val == Qnil) {
ptr = NULL;
}
else{
rb_raise(rb_eTypeError, "DL::PtrData was expected");
}
return ptr;
}
static VALUE
rb_dlptr_s_allocate(VALUE klass)
{
VALUE obj;
struct ptr_data *data;
rb_secure(4);
obj = Data_Make_Struct(klass, struct ptr_data, dlptr_mark, dlptr_free, data);
data->ptr = 0;
data->size = 0;
data->free = 0;
return obj;
}
static VALUE
rb_dlptr_initialize(int argc, VALUE argv[], VALUE self)
{
VALUE ptr, sym, size;
struct ptr_data *data;
void *p = NULL;
freefunc_t f = NULL;
long s = 0;
switch (rb_scan_args(argc, argv, "12", &ptr, &size, &sym)) {
case 1:
p = (void*)(NUM2PTR(rb_Integer(ptr)));
break;
case 2:
p = (void*)(NUM2PTR(rb_Integer(ptr)));
s = NUM2LONG(size);
break;
case 3:
p = (void*)(NUM2PTR(rb_Integer(ptr)));
s = NUM2LONG(size);
f = NIL_P(sym) ? NULL : RCFUNC_DATA(sym)->ptr;
break;
default:
rb_bug("rb_dlptr_initialize");
}
if (p) {
Data_Get_Struct(self, struct ptr_data, data);
if (data->ptr && data->free) {
/* Free previous memory. Use of inappropriate initialize may cause SEGV. */
(*(data->free))(data->ptr);
}
data->ptr = p;
data->size = s;
data->free = f;
}
return Qnil;
}
static VALUE
rb_dlptr_s_malloc(int argc, VALUE argv[], VALUE klass)
{
VALUE size, sym, obj;
int s;
freefunc_t f;
switch (rb_scan_args(argc, argv, "11", &size, &sym)) {
case 1:
s = NUM2LONG(size);
f = NULL;
break;
case 2:
s = NUM2LONG(size);
f = RCFUNC_DATA(sym)->ptr;
break;
default:
rb_bug("rb_dlptr_s_malloc");
}
obj = rb_dlptr_malloc(s,f);
return obj;
}
VALUE
rb_dlptr_to_i(VALUE self)
{
struct ptr_data *data;
Data_Get_Struct(self, struct ptr_data, data);
return PTR2NUM(data->ptr);
}
VALUE
rb_dlptr_to_value(VALUE self)
{
struct ptr_data *data;
Data_Get_Struct(self, struct ptr_data, data);
return (VALUE)(data->ptr);
}
VALUE
rb_dlptr_ptr(VALUE self)
{
struct ptr_data *data;
Data_Get_Struct(self, struct ptr_data, data);
return rb_dlptr_new(*((void**)(data->ptr)),0,0);
}
VALUE
rb_dlptr_ref(VALUE self)
{
struct ptr_data *data;
Data_Get_Struct(self, struct ptr_data, data);
return rb_dlptr_new(&(data->ptr),0,0);
}
VALUE
rb_dlptr_null_p(VALUE self)
{
struct ptr_data *data;
Data_Get_Struct(self, struct ptr_data, data);
return data->ptr ? Qfalse : Qtrue;
}
VALUE
rb_dlptr_free_set(VALUE self, VALUE val)
{
struct ptr_data *data;
extern VALUE rb_cDLCFunc;
Data_Get_Struct(self, struct ptr_data, data);
if( rb_obj_is_kind_of(val, rb_cDLCFunc) == Qtrue ){
data->free = RCFUNC_DATA(val)->ptr;
}
else{
data->free = NUM2PTR(rb_Integer(val));
}
return Qnil;
}
VALUE
rb_dlptr_free_get(VALUE self)
{
struct ptr_data *pdata;
Data_Get_Struct(self, struct ptr_data, pdata);
return rb_dlcfunc_new(pdata->free, DLTYPE_VOID, "free<anonymous>", CFUNC_CDECL);
}
VALUE
rb_dlptr_to_s(int argc, VALUE argv[], VALUE self)
{
struct ptr_data *data;
VALUE arg1, val;
int len;
Data_Get_Struct(self, struct ptr_data, data);
switch (rb_scan_args(argc, argv, "01", &arg1)) {
case 0:
val = rb_tainted_str_new2((char*)(data->ptr));
break;
case 1:
len = NUM2INT(arg1);
val = rb_tainted_str_new((char*)(data->ptr), len);
break;
default:
rb_bug("rb_dlptr_to_s");
}
return val;
}
VALUE
rb_dlptr_to_str(int argc, VALUE argv[], VALUE self)
{
struct ptr_data *data;
VALUE arg1, val;
int len;
Data_Get_Struct(self, struct ptr_data, data);
switch (rb_scan_args(argc, argv, "01", &arg1)) {
case 0:
val = rb_tainted_str_new((char*)(data->ptr),data->size);
break;
case 1:
len = NUM2INT(arg1);
val = rb_tainted_str_new((char*)(data->ptr), len);
break;
default:
rb_bug("rb_dlptr_to_str");
}
return val;
}
VALUE
rb_dlptr_inspect(VALUE self)
{
struct ptr_data *data;
char str[1024];
Data_Get_Struct(self, struct ptr_data, data);
snprintf(str, 1023, "#<%s:%p ptr=%p size=%ld free=%p>",
rb_class2name(CLASS_OF(self)), data, data->ptr, data->size, data->free);
return rb_str_new2(str);
}
VALUE
rb_dlptr_eql(VALUE self, VALUE other)
{
void *ptr1, *ptr2;
ptr1 = rb_dlptr2cptr(self);
ptr2 = rb_dlptr2cptr(other);
return ptr1 == ptr2 ? Qtrue : Qfalse;
}
VALUE
rb_dlptr_cmp(VALUE self, VALUE other)
{
void *ptr1, *ptr2;
ptr1 = rb_dlptr2cptr(self);
ptr2 = rb_dlptr2cptr(other);
return PTR2NUM((long)ptr1 - (long)ptr2);
}
VALUE
rb_dlptr_plus(VALUE self, VALUE other)
{
void *ptr;
long num, size;
ptr = rb_dlptr2cptr(self);
size = RPTR_DATA(self)->size;
num = NUM2LONG(other);
return rb_dlptr_new((char *)ptr + num, size - num, 0);
}
VALUE
rb_dlptr_minus(VALUE self, VALUE other)
{
void *ptr;
long num, size;
ptr = rb_dlptr2cptr(self);
size = RPTR_DATA(self)->size;
num = NUM2LONG(other);
return rb_dlptr_new((char *)ptr - num, size + num, 0);
}
VALUE
rb_dlptr_aref(int argc, VALUE argv[], VALUE self)
{
VALUE arg0, arg1;
size_t offset, len;
switch( rb_scan_args(argc, argv, "11", &arg0, &arg1) ){
case 1:
offset = NUM2ULONG(arg0);
len = 1;
break;
case 2:
offset = NUM2ULONG(arg0);
len = NUM2ULONG(arg1);
break;
defualt:
rb_bug("rb_dlptr_aset()");
}
return rb_tainted_str_new((char *)RPTR_DATA(self)->ptr + offset, len);
}
VALUE
rb_dlptr_aset(int argc, VALUE argv[], VALUE self)
{
VALUE arg0, arg1, arg2;
size_t offset, len;
void *mem;
switch( rb_scan_args(argc, argv, "21", &arg0, &arg1, &arg2) ){
case 2:
offset = NUM2ULONG(arg0);
len = 1;
mem = NUM2PTR(arg1);
break;
case 3:
offset = NUM2ULONG(arg0);
len = NUM2ULONG(arg1);
if( TYPE(arg2) == T_STRING ){
mem = StringValuePtr(arg2);
}
else if( rb_obj_is_kind_of(arg2, rb_cDLCPtr) ){
mem = rb_dlptr2cptr(arg2);
}
else{
mem = NUM2PTR(arg2);
}
break;
defualt:
rb_bug("rb_dlptr_aset()");
}
memcpy((char *)RPTR_DATA(self)->ptr + offset, mem, len);
return Qnil;
}
VALUE
rb_dlptr_size(int argc, VALUE argv[], VALUE self)
{
VALUE size;
if (rb_scan_args(argc, argv, "01", &size) == 0){
return LONG2NUM(RPTR_DATA(self)->size);
}
else{
RPTR_DATA(self)->size = NUM2LONG(size);
return size;
}
}
VALUE
rb_dlptr_s_to_ptr(VALUE self, VALUE val)
{
if( rb_obj_is_kind_of(val, rb_cIO) == Qtrue ){
OpenFile *fptr;
FILE *fp;
GetOpenFile(val, fptr);
#if RUBY_VERSION_CODE >= 190
fp = rb_io_stdio_file(fptr);
#else
fp = fptr->f;
#endif
return rb_dlptr_new(fp, sizeof(FILE), NULL);
}
else if( rb_respond_to(val, id_to_ptr) ){
VALUE vptr = rb_funcall(val, id_to_ptr, 0);
if( rb_obj_is_kind_of(vptr, rb_cDLCPtr) ){
return vptr;
}
else{
rb_raise(rb_eDLError, "to_ptr should return a CPtr object.");
}
}
else{
return rb_dlptr_new(NUM2PTR(rb_Integer(val)), 0, NULL);
}
}
void
Init_dlptr()
{
id_to_ptr = rb_intern("to_ptr");
rb_cDLCPtr = rb_define_class_under(rb_mDL, "CPtr", rb_cObject);
rb_define_alloc_func(rb_cDLCPtr, rb_dlptr_s_allocate);
rb_define_singleton_method(rb_cDLCPtr, "malloc", rb_dlptr_s_malloc, -1);
rb_define_singleton_method(rb_cDLCPtr, "to_ptr", rb_dlptr_s_to_ptr, 1);
rb_define_singleton_method(rb_cDLCPtr, "[]", rb_dlptr_s_to_ptr, 1);
rb_define_method(rb_cDLCPtr, "initialize", rb_dlptr_initialize, -1);
rb_define_method(rb_cDLCPtr, "free=", rb_dlptr_free_set, 1);
rb_define_method(rb_cDLCPtr, "free", rb_dlptr_free_get, 0);
rb_define_method(rb_cDLCPtr, "to_i", rb_dlptr_to_i, 0);
rb_define_method(rb_cDLCPtr, "to_value", rb_dlptr_to_value, 0);
rb_define_method(rb_cDLCPtr, "ptr", rb_dlptr_ptr, 0);
rb_define_method(rb_cDLCPtr, "+@", rb_dlptr_ptr, 0);
rb_define_method(rb_cDLCPtr, "ref", rb_dlptr_ref, 0);
rb_define_method(rb_cDLCPtr, "-@", rb_dlptr_ref, 0);
rb_define_method(rb_cDLCPtr, "null?", rb_dlptr_null_p, 0);
rb_define_method(rb_cDLCPtr, "to_s", rb_dlptr_to_s, -1);
rb_define_method(rb_cDLCPtr, "to_str", rb_dlptr_to_str, -1);
rb_define_method(rb_cDLCPtr, "inspect", rb_dlptr_inspect, 0);
rb_define_method(rb_cDLCPtr, "<=>", rb_dlptr_cmp, 1);
rb_define_method(rb_cDLCPtr, "==", rb_dlptr_eql, 1);
rb_define_method(rb_cDLCPtr, "eql?", rb_dlptr_eql, 1);
rb_define_method(rb_cDLCPtr, "+", rb_dlptr_plus, 1);
rb_define_method(rb_cDLCPtr, "-", rb_dlptr_minus, 1);
rb_define_method(rb_cDLCPtr, "[]", rb_dlptr_aref, -1);
rb_define_method(rb_cDLCPtr, "[]=", rb_dlptr_aset, -1);
rb_define_method(rb_cDLCPtr, "size", rb_dlptr_size, -1);
rb_define_method(rb_cDLCPtr, "size=", rb_dlptr_size, -1);
rb_define_const(rb_mDL, "NULL", rb_dlptr_new(0, 0, 0));
}
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