check that requested file is actually a directory

[unix-history] / usr / src / lib / libc / gen / opendir.c

/* Copyright (c) 1982 Regents of the University of California */

static char sccsid[] = "@(#)opendir.c 4.2 %G%";

#include <sys/types.h>
#include <sys/stat.h>
#include <ndir.h>

/*
* open a directory.
*/
DIR *
opendir(name)
       char *name;
{
       register DIR *dirp;
       struct stat sbuf;

       dirp = (DIR *)malloc(sizeof(DIR));
       dirp->dd_fd = open(name, 0);
       if (dirp->dd_fd == -1) {
               free(dirp);
               return NULL;
       }
       fstat(dirp->dd_fd, &sbuf);
       if ((sbuf.st_mode & S_IFDIR) == 0) {
               free(dirp);
               return NULL;
       }
       dirp->dd_loc = 0;
       return dirp;
}