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rewinddir.c
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C/C++ Source or Header
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1990-07-19
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761b
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31 lines
/* rewinddir -- rewind a directory stream Author: D.A. Gwyn */
/* last edit: 25-Apr-1987 D A Gwyn
This is not simply a call to seekdir(), because seekdir()
will use the current buffer whenever possible and we need
rewinddir() to forget about buffered data.
*/
#include <lib.h>
#include <dirent.h>
#include <unistd.h>
#define DULL (DIR *) NULL
#define CULL (char *) NULL
#ifndef SEEK_SET
#define SEEK_SET 0
#endif
void rewinddir(dirp)
register DIR *dirp; /* stream from opendir() */
{
if (dirp == DULL || dirp->dd_buf == CULL || dirp->dd_magic != _DIR_MAGIC) {
errno = EFAULT;
return; /* invalid pointer */
}
dirp->dd_loc = dirp->dd_size = 0; /* invalidate buffer */
(void) lseek(dirp->dd_fd, (off_t) 0, SEEK_SET); /* may set errno */
}