BSD 4_3 development

[unix-history] / usr / contrib / nntp / rrn / ndir.c

/* $Header: ndir.c,v 4.3.1.3 85/05/23 11:19:24 lwall Exp $
*
* $Log:        ndir.c,v $
* Revision 4.3.1.3  85/05/23  11:19:24  lwall
* Oops, shouldn't have included sys/types.h again.
* 
* Revision 4.3.1.2  85/05/15  14:46:00  lwall
* Changed short to ino_t, which may be ushort on some systems.
* 
* Revision 4.3.1.1  85/05/10  11:35:34  lwall
* Branch for patches.
* 
* Revision 4.3  85/05/01  11:42:55  lwall
* Baseline for release with 4.3bsd.
* 
*/

#include "EXTERN.h"
#include "common.h"
#include "INTERN.h"
#include "ndir.h"

#ifdef USENDIR
/*
* support for Berkeley directory reading routine on a V7 file system
*/

/*
* open a directory.
*/
DIR *
opendir(name)
char *name;
{
       register DIR *dirp;
       register int fd;

       if ((fd = open(name, 0)) == -1)
               return NULL;
       if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
               close (fd);
               return NULL;
       }
       dirp->dd_fd = fd;
       dirp->dd_loc = 0;
       return dirp;
}

/*
* read an old style directory entry and present it as a new one
*/
#ifndef pyr
#define ODIRSIZ 14

struct  olddirect {
       ino_t   od_ino;
       char    od_name[ODIRSIZ];
};
#else   an Pyramid in the ATT universe
#define ODIRSIZ 248

struct  olddirect {
       long    od_ino;
       short   od_fill1, od_fill2;
       char    od_name[ODIRSIZ];
};
#endif

/*
* get next entry in a directory.
*/
struct direct *
readdir(dirp)
register DIR *dirp;
{
       register struct olddirect *dp;
       static struct direct dir;

       for (;;) {
               if (dirp->dd_loc == 0) {
                       dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf,
                           DIRBLKSIZ);
                       if (dirp->dd_size <= 0)
                               return NULL;
               }
               if (dirp->dd_loc >= dirp->dd_size) {
                       dirp->dd_loc = 0;
                       continue;
               }
               dp = (struct olddirect *)(dirp->dd_buf + dirp->dd_loc);
               dirp->dd_loc += sizeof(struct olddirect);
               if (dp->od_ino == 0)
                       continue;
               dir.d_ino = dp->od_ino;
               strncpy(dir.d_name, dp->od_name, ODIRSIZ);
               dir.d_name[ODIRSIZ] = '\0'; /* insure null termination */
               dir.d_namlen = strlen(dir.d_name);
               dir.d_reclen = DIRSIZ(&dir);
               return (&dir);
       }
}

/*
* close a directory.
*/
void
closedir(dirp)
register DIR *dirp;
{
       close(dirp->dd_fd);
       dirp->dd_fd = -1;
       dirp->dd_loc = 0;
       free(dirp);
}
#endif USENDIR