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#include <u.h>
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#include <libc.h>
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extern	char	end[];
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static	char	*bloc = { end };
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extern	int	brk_(void*);
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enum
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{
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	Round	= 7
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};
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int
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brk(void *p)
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{
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	uintptr bl;
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	bl = ((uintptr)p + Round) & ~Round;
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	if(brk_((void*)bl) < 0)
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		return -1;
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	bloc = (char*)bl;
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	return 0;
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}
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void*
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sbrk(ulong n)
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{
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	uintptr bl;
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	bl = ((uintptr)bloc + Round) & ~Round;
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	if(brk_((void*)(bl+n)) < 0)
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		return (void*)-1;
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	bloc = (char*)bl + n;
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	return (void*)bl;
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}