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Annotation of 43BSDReno/contrib/isode-beta/dirent/rewinddir.c, revision 1.1.1.1

1.1       root        1: /*
                      2:        rewinddir -- rewind a directory stream
                      3: 
                      4:        last edit:      25-Apr-1987     D A Gwyn
                      5: 
                      6:        This is not simply a call to seekdir(), because seekdir()
                      7:        will use the current buffer whenever possible and we need
                      8:        rewinddir() to forget about buffered data.
                      9: */
                     10: 
                     11: #include       <sys/errno.h>
                     12: #include       <sys/types.h>
                     13: #include       "usr.dirent.h"
                     14: 
                     15: #ifndef        GETDENTS
                     16: extern off_t   lseek();
                     17: 
                     18: extern int     errno;
                     19: 
                     20: #ifndef NULL
                     21: #define        NULL    0
                     22: #endif
                     23: 
                     24: #ifndef SEEK_SET
                     25: #define        SEEK_SET        0
                     26: #endif
                     27: 
                     28: void
                     29: rewinddir( dirp )
                     30:        register DIR            *dirp;  /* stream from opendir() */
                     31:        {
                     32:        if ( dirp == NULL || dirp->dd_buf == NULL )
                     33:                {
                     34:                errno = EFAULT;
                     35:                return;                 /* invalid pointer */
                     36:                }
                     37: 
                     38:        dirp->dd_loc = dirp->dd_size = 0;       /* invalidate buffer */
                     39:        (void)lseek( dirp->dd_fd, (off_t)0, SEEK_SET ); /* may set errno */
                     40:        }
                     41: #endif

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