60 lines
1.7 KiB
Plaintext
60 lines
1.7 KiB
Plaintext
import vpsdk.syscall as _sc
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import string
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import t, c
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HEAP_BLOCK_MAGIC: t.CDefine = 0x48454150
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@t.Object
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class _heap_hdr:
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magic: uint32
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size: uint32
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_heap_inited: int = 0
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def _heap_init():
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global _heap_inited
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_heap_inited = 1
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def malloc(size: t.CSizeT) -> t.CPtr | t.CExport:
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global _heap_inited
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if size == 0: return None
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if _heap_inited == 0:
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_heap_init()
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hdr_size: t.CSizeT = _heap_hdr.__sizeof__()
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total: t.CSizeT = hdr_size + size
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ptr: uint64 = _sc._syscall1(uint64(_sc.SYSCALL_MMAP), uint64(total))
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if ptr == 0: return None
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hdr: _heap_hdr | t.CPtr = t.CPtr(ptr)
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hdr.magic = HEAP_BLOCK_MAGIC
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hdr.size = uint32(size)
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return t.CPtr(ptr + hdr_size)
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def free(ptr: t.CPtr) -> t.CExport:
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if ptr is None: return
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hdr_size: t.CSizeT = _heap_hdr.__sizeof__()
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hdr: _heap_hdr | t.CPtr = t.CPtr(uint64(ptr) - hdr_size)
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if hdr.magic != HEAP_BLOCK_MAGIC: return
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def calloc(nmemb: t.CSizeT, size: t.CSizeT) -> t.CPtr | t.CExport:
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total: t.CSizeT = nmemb * size
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p: t.CPtr = malloc(total)
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if p:
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string.memset(p, 0, total)
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return p
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def realloc(ptr: t.CPtr, size: t.CSizeT) -> t.CPtr | t.CExport:
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if ptr is None: return malloc(size)
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if size == 0:
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free(ptr)
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return None
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hdr_size: t.CSizeT = _heap_hdr.__sizeof__()
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hdr: _heap_hdr | t.CPtr = t.CPtr(uint64(ptr) - hdr_size)
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if hdr.magic != HEAP_BLOCK_MAGIC: return None
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old_size: t.CSizeT = hdr.size
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new_ptr: t.CPtr = malloc(size)
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if new_ptr is None: return None
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copy_size: t.CSizeT = old_size if old_size < size else size
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string.memcpy(new_ptr, ptr, copy_size)
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free(ptr)
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return new_ptr
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