NVlist.cc

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#include"NVlist.h"
#include"Error.h"

#include<fcntl.h>
#include<sys/mman.h>
#include<sys/stat.h>
#include<sys/types.h>

using namespace std;

void NVlist::sprepend(nvoff_t proot, const char *data, size_t szdata)
{
        Record *tail;
        Record *nr;
        nr = o2r(nvalloc(szdata + sizeof(Record)));
        tail = o2r(*(nvoff_t *) (mem_p + proot));

        nr->szdata = szdata;
        memcpy(nr->datap(), data, szdata);
        if (tail) {
                nr->next = tail->next;
                tail->next = r2o(nr);
        } else {
                *(nvoff_t *) (mem_p + proot) = nr->next = r2o(nr);
        }
}

void NVlist::sappend(nvoff_t proot, const char *data, size_t szdata)
{
        Record *tail;
        Record *nr;
        nr = o2r(nvalloc(szdata + sizeof(Record)));
        tail = o2r(*(nvoff_t *) (mem_p + proot));

        nr->szdata = szdata;
        memcpy(nr->datap(), data, szdata);
        if (tail) {
                nr->next = tail->next;
                *(nvoff_t *) (mem_p + proot) = tail->next = r2o(nr);
        } else {
                *(nvoff_t *) (mem_p + proot) = nr->next = r2o(nr);
        }
}

void NVlist::sremove(nvoff_t proot)
{
        Record *tail = o2r(*(nvoff_t *) (mem_p + proot));
        Record *nr = o2r(tail->next);

        if (tail == nr) {
                *(nvoff_t *) (mem_p + proot) = 0;
        } else {
                tail->next = nr->next;
        }
        nvfree(r2o(nr));
}

void NVlist::sclear(nvoff_t proot)
{
        while (*(nvoff_t *) (mem_p + proot))
                sremove(proot);
}

void NVlist::sprint(nvoff_t proot, ostream & os)
{
        int i = 0;
        Record *head = o2r(*(nvoff_t *) (mem_p + proot));
        Record *r = head;

        while (r) {
                r = o2r(r->next);
                os << i++ << ": " << r2o(r) << "(" << r->
                    szdata << "): " << r->datap() << endl;
                if (r == head)
                        r = NULL;
        }
}

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