diplodocus.org Git - nmh/blob - docs/historical/mh-6.8.5/miscellany/libndir/readdir.c

   1 static char sccsid[] = "@(#)readdir.c   4.1     (Berkeley)      83/03/21";
   2
   3 #include <sys/types.h>
   4 #include <dir.h>
   5
   6 /*
   7  * read an old stlye directory entry and present it as a new one
   8  */
   9 #define ODIRSIZ 14
  10
  11 struct  olddirect {
  12         ino_t   od_ino;
  13         char    od_name[ODIRSIZ];
  14 };
  15
  16 /*
  17  * get next entry in a directory.
  18  */
  19 struct direct *
  20 readdir(dirp)
  21         register DIR *dirp;
  22 {
  23         register struct olddirect *dp;
  24         static struct direct dir;
  25
  26         for (;;) {
  27                 if (dirp->dd_loc == 0) {
  28                         dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf,
  29                             DIRBLKSIZ);
  30                         if (dirp->dd_size <= 0)
  31                                 return NULL;
  32                 }
  33                 if (dirp->dd_loc >= dirp->dd_size) {
  34                         dirp->dd_loc = 0;
  35                         continue;
  36                 }
  37                 dp = (struct olddirect *)(dirp->dd_buf + dirp->dd_loc);
  38                 dirp->dd_loc += sizeof(struct olddirect);
  39                 if (dp->od_ino == 0)
  40                         continue;
  41                 dir.d_ino = dp->od_ino;
  42                 strncpy(dir.d_name, dp->od_name, ODIRSIZ);
  43                 dir.d_name[ODIRSIZ] = '\0'; /* insure null termination */
  44                 dir.d_namlen = strlen(dir.d_name);
  45                 dir.d_reclen = DIRBLKSIZ;
  46                 return (&dir);
  47         }
  48 }