Plan 9 from Bell Labs’s /usr/web/sources/contrib/rsc/linuxemu/libc/port/sbrk.c

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Distributed under the MIT License.
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#include <u.h>
#include <libc.h>

extern	char	end[];
static	char	*bloc = { end };
extern	int	brk_(void*);

enum
{
	Round	= 7
};

int
brk(void *p)
{
	ulong bl;

	bl = ((ulong)p + Round) & ~Round;
	if(brk_((void*)bl) < 0)
		return -1;
	bloc = (char*)bl;
	return 0;
}

void*
sbrk(ulong n)
{
	ulong bl;

	bl = ((ulong)bloc + Round) & ~Round;
	if(brk_((void*)(bl+n)) < 0)
		return (void*)-1;
	bloc = (char*)bl + n;
	return (void*)bl;
}

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