mirror of
https://github.com/ceph/go-ceph
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c45fa95b32
This change uses slices on top of C allocated array memory in order to have a simple (no pointer arithmetic) and safe (boundary-checked) access to its elements. Signed-off-by: Sven Anderson <sven@redhat.com>
64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
package cutil
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/*
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#include <stdlib.h>
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#include <string.h>
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typedef void* voidptr;
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*/
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import "C"
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import (
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"math"
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"unsafe"
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)
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const (
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// MaxIdx is the maximum index on 32 bit systems
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MaxIdx = math.MaxInt32 // 2GB, max int32 value, should be safe
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// PtrSize is the size of a pointer
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PtrSize = C.sizeof_voidptr
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// SizeTSize is the size of C.size_t
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SizeTSize = C.sizeof_size_t
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)
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// SizeT wraps size_t from C.
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type SizeT C.size_t
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// This section contains a bunch of types that are basically just
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// unsafe.Pointer but have specific types to help "self document" what the
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// underlying pointer is really meant to represent.
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// CPtr is an unsafe.Pointer to C allocated memory
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type CPtr unsafe.Pointer
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// CharPtrPtr is an unsafe pointer wrapping C's `char**`.
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type CharPtrPtr unsafe.Pointer
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// CharPtr is an unsafe pointer wrapping C's `char*`.
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type CharPtr unsafe.Pointer
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// SizeTPtr is an unsafe pointer wrapping C's `size_t*`.
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type SizeTPtr unsafe.Pointer
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// FreeFunc is a wrapper around calls to, or act like, C's free function.
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type FreeFunc func(unsafe.Pointer)
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// Malloc is C.malloc
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func Malloc(s SizeT) CPtr { return CPtr(C.malloc(C.size_t(s))) }
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// Free is C.free
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func Free(p CPtr) { C.free(unsafe.Pointer(p)) }
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// CString is C.CString
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func CString(s string) CharPtr { return CharPtr((C.CString(s))) }
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// CBytes is C.CBytes
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func CBytes(b []byte) CPtr { return CPtr(C.CBytes(b)) }
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// Memcpy is C.memcpy
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func Memcpy(dst, src CPtr, n SizeT) {
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C.memcpy(unsafe.Pointer(dst), unsafe.Pointer(src), C.size_t(n))
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}
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