Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>

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

enum
{
        Round   = 7
};

int
brk(void *p)
{
        uintptr bl;

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

void*
sbrk(ulong n)
{
        uintptr bl;

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