4.3BSD - /usr/src/new/mh/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: }

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Defined macros