get rid of old style directory entries (known only in readdir.c)

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

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

static char sccsid[] = "@(#)readdir.c 1.4 %G%";

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

/*
* read an old stlye directory entry and present it as a new one
*/
#ifndef DIRSIZ
#define DIRSIZ  14
#endif

struct  olddirect {
       ino_t   d_ino;
       char    d_name[DIRSIZ];
};

/*
* get next entry in a directory.
*/
struct direct *
readdir(dirp)
       register DIR *dirp;
{
       register struct olddirect *dp;
       static union {
               struct direct un_dir;
               char pad[MAXDIRSIZ];
       } dirun;
#define dir dirun.un_dir

       for (;;) {
               if (dirp->dd_loc == 0) {
                       dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, 
                           MAXDIRSIZ);
                       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->d_ino == 0)
                       continue;
               dir.d_ino = dp->d_ino;
               strncpy(dir.d_name, dp->d_name, DIRSIZ);
               dir.d_namlen = strlen(dir.d_name);
               dir.d_reclen = ((sizeof(struct direct) + dir.d_namlen)
                   + 4) & ~03;
               return (&dir);
       }
}