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- /*
- readdir -- read next entry from a directory stream
- last edit: 25-Apr-1987 D A Gwyn
- */
- #include <errno.h>
- #include <sys/errno.h>
- #include <sys/types.h>
- #include <dirent.h>
- /* SVR3 system call, or emulation for getdents() */
- extern int getdents(int fildes, char *buf, unsigned nbyte);
- #ifndef NULL
- #define NULL 0
- #endif
- struct dirent *
- readdir(register DIR *dirp)
- {
- register struct dirent *dp; /* -> directory data */
- if ( dirp == NULL || dirp->dd_buf == NULL )
- {
- errno = EFAULT;
- return NULL; /* invalid pointer */
- }
- do {
- if ( dirp->dd_loc >= dirp->dd_size ) /* empty or obsolete */
- dirp->dd_loc = dirp->dd_size = 0;
- if ( dirp->dd_size == 0 /* need to refill buffer */
- && (dirp->dd_size =
- getdents( dirp->dd_fd, dirp->dd_buf, (unsigned)DIRBUF )
- ) <= 0
- )
- return NULL; /* EOF or error */
- dp = (struct dirent *)&dirp->dd_buf[dirp->dd_loc];
- dirp->dd_loc += dp->d_reclen;
- }
- while ( dp->d_ino == 0L ); /* don't rely on getdents() */
- return dp;
- }
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