diff options
Diffstat (limited to 'sysdeps/unix/readdir.c')
-rw-r--r-- | sysdeps/unix/readdir.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/sysdeps/unix/readdir.c b/sysdeps/unix/readdir.c new file mode 100644 index 0000000..3ffa63e --- /dev/null +++ b/sysdeps/unix/readdir.c @@ -0,0 +1,82 @@ +/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <ansidecl.h> +#include <errno.h> +#include <limits.h> +#include <stddef.h> +#include <string.h> +#include <dirent.h> +#include <unistd.h> +#include <sys/types.h> + +#include "direct.h" /* This file defines `struct direct'. */ + +/* direct.h may have an alternate definition for this. */ +#ifndef D_RECLEN +#define D_RECLEN(dp) ((dp)->d_reclen) +#endif + + +/* Read a directory entry from DIRP. */ +struct dirent * +DEFUN(readdir, (dirp), DIR *dirp) +{ + if (dirp == NULL || dirp->__data == NULL) + { + errno = EINVAL; + return NULL; + } + + while (1) + { + struct direct *dp; + + if (dirp->__offset >= dirp->__size) + { + /* We've emptied out our buffer. Refill it. */ + + off_t base; + ssize_t bytes = __getdirentries (dirp->__fd, dirp->__data, + dirp->__allocation, &base); + if (bytes <= 0) + return NULL; + dirp->__size = (size_t) bytes; + + /* Reset the offset into the buffer. */ + dirp->__offset = 0; + } + + dp = (struct direct *) &dirp->__data[dirp->__offset]; + dirp->__offset += D_RECLEN (dp); + + if (dp->d_ino != 0) + { + /* Not a deleted file. */ + register struct dirent *d = &dirp->__entry; + register const char *p; + d->d_fileno = (ino_t) dp->d_ino; + /* On some systems the name length does not actually mean much. + But we always use it as a maximum. */ + p = memchr ((PTR) dp->d_name, '\0', D_NAMLEN (dp) + 1); + d->d_namlen = (p != NULL) ? p - dp->d_name : D_NAMLEN (dp); + memcpy (d->d_name, dp->d_name, d->d_namlen + 1); + return d; + } + } +} |