Subversion Repositories planix.SVN

#include "lib.h"
#include <string.h>
#include <stdlib.h>
#include "sys9.h"
#include "dir.h"

enum
{
        DIRSIZE = STATFIXLEN + 16 * 4           /* enough for encoded stat buf + some reasonable strings */
};

Dir*
_dirstat(char *name)
{
        Dir *d;
        uchar *buf;
        int n, nd, i;

        nd = DIRSIZE;
        for(i=0; i<2; i++){     /* should work by the second try */
                d = malloc(sizeof(Dir) + BIT16SZ +nd);
                if(d == nil)
                        return nil;
                buf = (uchar*)&d[1];
                n = _STAT(name, buf, BIT16SZ+nd);
                if(n < BIT16SZ){
                        free(d);
                        return nil;
                }
                nd = GBIT16((uchar*)buf);       /* size needed to store whole stat buffer */
                if(nd <= n){
                        _convM2D(buf, n, d, (char*)&d[1]);
                        return d;
                }
                /* else sizeof(Dir)+BIT16SZ+nd is plenty */
                free(d);
        }
        return nil;
}

int
_dirwstat(char *name, Dir *d)
{
        uchar *buf;
        int r;

        r = _sizeD2M(d);
        buf = malloc(r);
        if(buf == nil)
                return -1;
        _convD2M(d, buf, r);
        r = _WSTAT(name, buf, r);
        free(buf);
        return r;
}

Dir*
_dirfstat(int fd)
{
        Dir *d;
        uchar *buf;
        int n, nd, i;

        nd = DIRSIZE;
        for(i=0; i<2; i++){     /* should work by the second try */
                d = malloc(sizeof(Dir) + nd);
                if(d == nil)
                        return nil;
                buf = (uchar*)&d[1];
                n = _FSTAT(fd, buf, nd);
                if(n < BIT16SZ){
                        free(d);
                        return nil;
                }
                nd = GBIT16(buf);       /* size needed to store whole stat buffer */
                if(nd <= n){
                        _convM2D(buf, n, d, (char*)&d[1]);
                        return d;
                }
                /* else sizeof(Dir)+nd is plenty */
                free(d);
        }
        return nil;
}

int
_dirfwstat(int fd, Dir *d)
{
        uchar *buf;
        int r;

        r = _sizeD2M(d);
        buf = malloc(r);
        if(buf == nil)
                return -1;
        _convD2M(d, buf, r);
        r = _FWSTAT(fd, buf, r);
        free(buf);
        return r;
}

void
_nulldir(Dir *d)
{
        memset(d, ~0, sizeof(Dir));
        d->name = d->uid = d->gid = d->muid = "";
}