summaryrefslogtreecommitdiff
path: root/ext/fiddle/pointer.c
diff options
context:
space:
mode:
authortenderlove <tenderlove@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2012-11-27 05:59:34 +0000
committertenderlove <tenderlove@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2012-11-27 05:59:34 +0000
commit1eac1cb21ebb095886393ee71acd0ed8f6dedab8 (patch)
tree5200317a05b1ae0a676f02ff206f2b5dc6b10b87 /ext/fiddle/pointer.c
parent1d8d7a3eec54a5440a1942c0b589c228138834ae (diff)
reverting r37881
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37891 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'ext/fiddle/pointer.c')
-rw-r--r--ext/fiddle/pointer.c691
1 files changed, 0 insertions, 691 deletions
diff --git a/ext/fiddle/pointer.c b/ext/fiddle/pointer.c
deleted file mode 100644
index a06f60c..0000000
--- a/ext/fiddle/pointer.c
+++ /dev/null
@@ -1,691 +0,0 @@
-/* -*- C -*-
- * $Id$
- */
-
-#include <ruby/ruby.h>
-#include <ruby/io.h>
-#include <ctype.h>
-#include <fiddle.h>
-
-VALUE rb_cPointer;
-
-typedef void (*freefunc_t)(void*);
-
-struct ptr_data {
- void *ptr;
- long size;
- freefunc_t free;
- VALUE wrap[2];
-};
-
-#define RPTR_DATA(obj) ((struct ptr_data *)(DATA_PTR(obj)))
-
-static inline freefunc_t
-get_freefunc(VALUE func, volatile VALUE *wrap)
-{
- VALUE addrnum;
- if (NIL_P(func)) {
- *wrap = 0;
- return NULL;
- }
- addrnum = rb_Integer(func);
- *wrap = (addrnum != func) ? func : 0;
- return (freefunc_t)(VALUE)NUM2PTR(addrnum);
-}
-
-static ID id_to_ptr;
-
-static void
-dlptr_mark(void *ptr)
-{
- struct ptr_data *data = ptr;
- if (data->wrap[0]) {
- rb_gc_mark(data->wrap[0]);
- }
- if (data->wrap[1]) {
- rb_gc_mark(data->wrap[1]);
- }
-}
-
-static void
-dlptr_free(void *ptr)
-{
- struct ptr_data *data = ptr;
- if (data->ptr) {
- if (data->free) {
- (*(data->free))(data->ptr);
- }
- }
-}
-
-static size_t
-dlptr_memsize(const void *ptr)
-{
- const struct ptr_data *data = ptr;
- return data ? sizeof(*data) + data->size : 0;
-}
-
-static const rb_data_type_t dlptr_data_type = {
- "fiddle/pointer",
- {dlptr_mark, dlptr_free, dlptr_memsize,},
-};
-
-VALUE
-rb_dlptr_new2(VALUE klass, void *ptr, long size, freefunc_t func)
-{
- struct ptr_data *data;
- VALUE val;
-
- rb_secure(4);
- val = TypedData_Make_Struct(klass, struct ptr_data, &dlptr_data_type, data);
- data->ptr = ptr;
- data->free = func;
- data->size = size;
- OBJ_TAINT(val);
-
- return val;
-}
-
-VALUE
-rb_dlptr_new(void *ptr, long size, freefunc_t func)
-{
- return rb_dlptr_new2(rb_cPointer, 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_cPointer)) {
- TypedData_Get_Struct(val, struct ptr_data, &dlptr_data_type, 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 = TypedData_Make_Struct(klass, struct ptr_data, &dlptr_data_type, data);
- data->ptr = 0;
- data->size = 0;
- data->free = 0;
-
- return obj;
-}
-
-/*
- * call-seq:
- * DL::CPtr.new(address) => dl_cptr
- * DL::CPtr.new(address, size) => dl_cptr
- * DL::CPtr.new(address, size, freefunc) => dl_cptr
- *
- * Create a new pointer to +address+ with an optional +size+ and +freefunc+.
- * +freefunc+ will be called when the instance is garbage collected.
- */
-static VALUE
-rb_dlptr_initialize(int argc, VALUE argv[], VALUE self)
-{
- VALUE ptr, sym, size, wrap = 0, funcwrap = 0;
- struct ptr_data *data;
- void *p = NULL;
- freefunc_t f = NULL;
- long s = 0;
-
- if (rb_scan_args(argc, argv, "12", &ptr, &size, &sym) >= 1) {
- VALUE addrnum = rb_Integer(ptr);
- if (addrnum != ptr) wrap = ptr;
- p = NUM2PTR(addrnum);
- }
- if (argc >= 2) {
- s = NUM2LONG(size);
- }
- if (argc >= 3) {
- f = get_freefunc(sym, &funcwrap);
- }
-
- if (p) {
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, data);
- if (data->ptr && data->free) {
- /* Free previous memory. Use of inappropriate initialize may cause SEGV. */
- (*(data->free))(data->ptr);
- }
- data->wrap[0] = wrap;
- data->wrap[1] = funcwrap;
- data->ptr = p;
- data->size = s;
- data->free = f;
- }
-
- return Qnil;
-}
-
-/*
- * call-seq:
- *
- * Fiddle::Pointer.malloc(size, freefunc = nil) => fiddle pointer instance
- *
- * Allocate +size+ bytes of memory and associate it with an optional
- * +freefunc+ that will be called when the pointer is garbage collected.
- * +freefunc+ must be an address pointing to a function or an instance of
- * Fiddle::Function
- */
-static VALUE
-rb_dlptr_s_malloc(int argc, VALUE argv[], VALUE klass)
-{
- VALUE size, sym, obj, wrap = 0;
- long 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 = get_freefunc(sym, &wrap);
- break;
- default:
- rb_bug("rb_dlptr_s_malloc");
- }
-
- obj = rb_dlptr_malloc(s,f);
- if (wrap) RPTR_DATA(obj)->wrap[1] = wrap;
-
- return obj;
-}
-
-/*
- * call-seq: to_i
- *
- * Returns the integer memory location of this DL::CPtr.
- */
-static VALUE
-rb_dlptr_to_i(VALUE self)
-{
- struct ptr_data *data;
-
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, data);
- return PTR2NUM(data->ptr);
-}
-
-/*
- * call-seq: to_value
- *
- * Cast this CPtr to a ruby object.
- */
-static VALUE
-rb_dlptr_to_value(VALUE self)
-{
- struct ptr_data *data;
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, data);
- return (VALUE)(data->ptr);
-}
-
-/*
- * call-seq: ptr
- *
- * Returns a DL::CPtr that is a dereferenced pointer for this DL::CPtr.
- * Analogous to the star operator in C.
- */
-VALUE
-rb_dlptr_ptr(VALUE self)
-{
- struct ptr_data *data;
-
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, data);
- return rb_dlptr_new(*((void**)(data->ptr)),0,0);
-}
-
-/*
- * call-seq: ref
- *
- * Returns a DL::CPtr that is a reference pointer for this DL::CPtr.
- * Analogous to the ampersand operator in C.
- */
-VALUE
-rb_dlptr_ref(VALUE self)
-{
- struct ptr_data *data;
-
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, data);
- return rb_dlptr_new(&(data->ptr),0,0);
-}
-
-/*
- * call-seq: null?
- *
- * Returns true if this is a null pointer.
- */
-VALUE
-rb_dlptr_null_p(VALUE self)
-{
- struct ptr_data *data;
-
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, data);
- return data->ptr ? Qfalse : Qtrue;
-}
-
-/*
- * call-seq: free=(function)
- *
- * Set the free function for this pointer to the DL::CFunc in +function+.
- */
-static VALUE
-rb_dlptr_free_set(VALUE self, VALUE val)
-{
- struct ptr_data *data;
-
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, data);
- data->free = get_freefunc(val, &data->wrap[1]);
-
- return Qnil;
-}
-
-/*
- * call-seq: free
- *
- * Get the free function for this pointer. Returns Fiddle::Function.
- */
-static VALUE
-rb_dlptr_free_get(VALUE self)
-{
- struct ptr_data *pdata;
- VALUE address;
- VALUE arg_types;
- VALUE ret_type;
-
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, pdata);
-
- if (!pdata->free)
- return Qnil;
-
- address = PTR2NUM(pdata->free);
- ret_type = INT2NUM(TYPE_VOID);
- arg_types = rb_ary_new();
- rb_ary_push(arg_types, INT2NUM(TYPE_VOIDP));
-
- return rb_fiddle_new_function(address, arg_types, ret_type);
-}
-
-/*
- * call-seq:
- *
- * ptr.to_s => string
- * ptr.to_s(len) => string
- *
- * Returns the pointer contents as a string. When called with no arguments,
- * this method will return the contents until the first NULL byte. When
- * called with +len+, a string of +len+ bytes will be returned.
- */
-static VALUE
-rb_dlptr_to_s(int argc, VALUE argv[], VALUE self)
-{
- struct ptr_data *data;
- VALUE arg1, val;
- int len;
-
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, 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;
-}
-
-/*
- * call-seq:
- *
- * ptr.to_str => string
- * ptr.to_str(len) => string
- *
- * Returns the pointer contents as a string. When called with no arguments,
- * this method will return the contents with the length of this pointer's
- * +size+. When called with +len+, a string of +len+ bytes will be returned.
- */
-static VALUE
-rb_dlptr_to_str(int argc, VALUE argv[], VALUE self)
-{
- struct ptr_data *data;
- VALUE arg1, val;
- int len;
-
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, 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;
-}
-
-/*
- * call-seq: inspect
- *
- * Returns a string formatted with an easily readable representation of the
- * internal state of the DL::CPtr
- */
-static VALUE
-rb_dlptr_inspect(VALUE self)
-{
- struct ptr_data *data;
- char str[1024];
-
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, 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);
-}
-
-/*
- * call-seq:
- * ptr == other => true or false
- * ptr.eql?(other) => true or false
- *
- * Returns true if +other+ wraps the same pointer, otherwise returns
- * false.
- */
-VALUE
-rb_dlptr_eql(VALUE self, VALUE other)
-{
- void *ptr1, *ptr2;
-
- if(!rb_obj_is_kind_of(other, rb_cPointer)) return Qfalse;
-
- ptr1 = rb_dlptr2cptr(self);
- ptr2 = rb_dlptr2cptr(other);
-
- return ptr1 == ptr2 ? Qtrue : Qfalse;
-}
-
-/*
- * call-seq:
- * ptr <=> other => -1, 0, 1, or nil
- *
- * Returns -1 if less than, 0 if equal to, 1 if greater than +other+. Returns
- * nil if +ptr+ cannot be compared to +other+.
- */
-static VALUE
-rb_dlptr_cmp(VALUE self, VALUE other)
-{
- void *ptr1, *ptr2;
- SIGNED_VALUE diff;
-
- if(!rb_obj_is_kind_of(other, rb_cPointer)) return Qnil;
-
- ptr1 = rb_dlptr2cptr(self);
- ptr2 = rb_dlptr2cptr(other);
- diff = (SIGNED_VALUE)ptr1 - (SIGNED_VALUE)ptr2;
- if (!diff) return INT2FIX(0);
- return diff > 0 ? INT2NUM(1) : INT2NUM(-1);
-}
-
-/*
- * call-seq:
- * ptr + n => new cptr
- *
- * Returns a new DL::CPtr that has been advanced +n+ bytes.
- */
-static 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);
-}
-
-/*
- * call-seq:
- * ptr - n => new cptr
- *
- * Returns a new DL::CPtr that has been moved back +n+ bytes.
- */
-static 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);
-}
-
-/*
- * call-seq:
- * ptr[index] -> an_integer
- * ptr[start, length] -> a_string
- *
- * Returns integer stored at _index_. If _start_ and _length_ are given,
- * a string containing the bytes from _start_ of length _length_ will be
- * returned.
- */
-VALUE
-rb_dlptr_aref(int argc, VALUE argv[], VALUE self)
-{
- VALUE arg0, arg1;
- VALUE retval = Qnil;
- size_t offset, len;
- struct ptr_data *data;
-
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, data);
- if (!data->ptr) rb_raise(rb_eFiddleError, "NULL pointer dereference");
- switch( rb_scan_args(argc, argv, "11", &arg0, &arg1) ){
- case 1:
- offset = NUM2ULONG(arg0);
- retval = INT2NUM(*((char *)data->ptr + offset));
- break;
- case 2:
- offset = NUM2ULONG(arg0);
- len = NUM2ULONG(arg1);
- retval = rb_tainted_str_new((char *)data->ptr + offset, len);
- break;
- default:
- rb_bug("rb_dlptr_aref()");
- }
- return retval;
-}
-
-/*
- * call-seq:
- * ptr[index] = int -> int
- * ptr[start, length] = string or cptr or addr -> string or dl_cptr or addr
- *
- * Set the value at +index+ to +int+. Or, set the memory at +start+ until
- * +length+ with the contents of +string+, the memory from +dl_cptr+, or the
- * memory pointed at by the memory address +addr+.
- */
-VALUE
-rb_dlptr_aset(int argc, VALUE argv[], VALUE self)
-{
- VALUE arg0, arg1, arg2;
- VALUE retval = Qnil;
- size_t offset, len;
- void *mem;
- struct ptr_data *data;
-
- TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, data);
- if (!data->ptr) rb_raise(rb_eFiddleError, "NULL pointer dereference");
- switch( rb_scan_args(argc, argv, "21", &arg0, &arg1, &arg2) ){
- case 2:
- offset = NUM2ULONG(arg0);
- ((char*)data->ptr)[offset] = NUM2UINT(arg1);
- retval = arg1;
- break;
- case 3:
- offset = NUM2ULONG(arg0);
- len = NUM2ULONG(arg1);
- if (RB_TYPE_P(arg2, T_STRING)) {
- mem = StringValuePtr(arg2);
- }
- else if( rb_obj_is_kind_of(arg2, rb_cPointer) ){
- mem = rb_dlptr2cptr(arg2);
- }
- else{
- mem = NUM2PTR(arg2);
- }
- memcpy((char *)data->ptr + offset, mem, len);
- retval = arg2;
- break;
- default:
- rb_bug("rb_dlptr_aset()");
- }
- return retval;
-}
-
-/*
- * call-seq: size=(size)
- *
- * Set the size of this pointer to +size+
- */
-static VALUE
-rb_dlptr_size_set(VALUE self, VALUE size)
-{
- RPTR_DATA(self)->size = NUM2LONG(size);
- return size;
-}
-
-/*
- * call-seq: size
- *
- * Get the size of this pointer.
- */
-static VALUE
-rb_dlptr_size_get(VALUE self)
-{
- return LONG2NUM(RPTR_DATA(self)->size);
-}
-
-/*
- * call-seq:
- * Fiddle::Pointer.to_ptr(val) => cptr
- * Fiddle::Pointer[val] => cptr
- *
- * Get the underlying pointer for ruby object +val+ and return it as a
- * Fiddle::Pointer object.
- */
-static VALUE
-rb_dlptr_s_to_ptr(VALUE self, VALUE val)
-{
- VALUE ptr, wrap = val, vptr;
-
- if (RTEST(rb_obj_is_kind_of(val, rb_cIO))){
- rb_io_t *fptr;
- FILE *fp;
- GetOpenFile(val, fptr);
- fp = rb_io_stdio_file(fptr);
- ptr = rb_dlptr_new(fp, 0, NULL);
- }
- else if (RTEST(rb_obj_is_kind_of(val, rb_cString))){
- char *str = StringValuePtr(val);
- ptr = rb_dlptr_new(str, RSTRING_LEN(val), NULL);
- }
- else if ((vptr = rb_check_funcall(val, id_to_ptr, 0, 0)) != Qundef){
- if (rb_obj_is_kind_of(vptr, rb_cPointer)){
- ptr = vptr;
- wrap = 0;
- }
- else{
- rb_raise(rb_eFiddleError, "to_ptr should return a Fiddle::Pointer object");
- }
- }
- else{
- VALUE num = rb_Integer(val);
- if (num == val) wrap = 0;
- ptr = rb_dlptr_new(NUM2PTR(num), 0, NULL);
- }
- OBJ_INFECT(ptr, val);
- if (wrap) RPTR_DATA(ptr)->wrap[0] = wrap;
- return ptr;
-}
-
-void
-Init_fiddle_pointer(void)
-{
- id_to_ptr = rb_intern("to_ptr");
-
- /* Document-class: Fiddle::Pointer
- *
- * Fiddle::Pointer is a class to handle C pointers
- *
- */
- rb_cPointer = rb_define_class_under(mFiddle, "Pointer", rb_cObject);
- rb_define_alloc_func(rb_cPointer, rb_dlptr_s_allocate);
- rb_define_singleton_method(rb_cPointer, "malloc", rb_dlptr_s_malloc, -1);
- rb_define_singleton_method(rb_cPointer, "to_ptr", rb_dlptr_s_to_ptr, 1);
- rb_define_singleton_method(rb_cPointer, "[]", rb_dlptr_s_to_ptr, 1);
- rb_define_method(rb_cPointer, "initialize", rb_dlptr_initialize, -1);
- rb_define_method(rb_cPointer, "free=", rb_dlptr_free_set, 1);
- rb_define_method(rb_cPointer, "free", rb_dlptr_free_get, 0);
- rb_define_method(rb_cPointer, "to_i", rb_dlptr_to_i, 0);
- rb_define_method(rb_cPointer, "to_int", rb_dlptr_to_i, 0);
- rb_define_method(rb_cPointer, "to_value", rb_dlptr_to_value, 0);
- rb_define_method(rb_cPointer, "ptr", rb_dlptr_ptr, 0);
- rb_define_method(rb_cPointer, "+@", rb_dlptr_ptr, 0);
- rb_define_method(rb_cPointer, "ref", rb_dlptr_ref, 0);
- rb_define_method(rb_cPointer, "-@", rb_dlptr_ref, 0);
- rb_define_method(rb_cPointer, "null?", rb_dlptr_null_p, 0);
- rb_define_method(rb_cPointer, "to_s", rb_dlptr_to_s, -1);
- rb_define_method(rb_cPointer, "to_str", rb_dlptr_to_str, -1);
- rb_define_method(rb_cPointer, "inspect", rb_dlptr_inspect, 0);
- rb_define_method(rb_cPointer, "<=>", rb_dlptr_cmp, 1);
- rb_define_method(rb_cPointer, "==", rb_dlptr_eql, 1);
- rb_define_method(rb_cPointer, "eql?", rb_dlptr_eql, 1);
- rb_define_method(rb_cPointer, "+", rb_dlptr_plus, 1);
- rb_define_method(rb_cPointer, "-", rb_dlptr_minus, 1);
- rb_define_method(rb_cPointer, "[]", rb_dlptr_aref, -1);
- rb_define_method(rb_cPointer, "[]=", rb_dlptr_aset, -1);
- rb_define_method(rb_cPointer, "size", rb_dlptr_size_get, 0);
- rb_define_method(rb_cPointer, "size=", rb_dlptr_size_set, 1);
-
- /* Document-const: NULL
- *
- * A NULL pointer
- */
- rb_define_const(mFiddle, "NULL", rb_dlptr_new(0, 0, 0));
-}