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-rw-r--r--dirent/dirent.h52
1 files changed, 35 insertions, 17 deletions
diff --git a/dirent/dirent.h b/dirent/dirent.h
index 5b99437301..d93a146a83 100644
--- a/dirent/dirent.h
+++ b/dirent/dirent.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 92, 93, 94, 95, 96 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
@@ -29,30 +29,48 @@ __BEGIN_DECLS
#include <gnu/types.h>
+/* This file defines `struct dirent'.
-/* Directory entry structure.
+ It defines the macro `_DIRENT_HAVE_D_NAMLEN' iff there is a `d_namlen'
+ member that gives the length of `d_name'.
- This structure is laid out identically to the `struct direct' that
- represents directory entries in the GNU Hurd and in BSD 4.4 (and
- incidentally, on disk in the Berkeley fast file system). The `readdir'
- implementations for GNU and BSD know this; you must change them if you
- change this structure. */
+ It defines the macro `_DIRENT_HAVE_D_RECLEN' iff there is a `d_reclen'
+ member that gives the size of the entire directory entry. */
-struct dirent
- {
- __ino_t d_fileno; /* File serial number. */
- unsigned short int d_reclen; /* Length of the whole `struct dirent'. */
- unsigned char d_type; /* File type, possibly unknown. */
- unsigned char d_namlen; /* Length of the file name. */
-
- /* Only this member is in the POSIX standard. */
- char d_name[1]; /* File name (actually longer). */
- };
+#include <direntry.h>
#if defined(__USE_BSD) || defined(__USE_MISC)
#define d_ino d_fileno /* Backward compatibility. */
#endif
+/* These macros extract size information from a `struct dirent *'.
+ They may evaluate their argument multiple times, so it must not
+ have side effects. Each of these may involve a relatively costly
+ call to `strlen' on some systems, so these values should be cached.
+
+ _D_EXACT_NAMLEN (DP) returns the length of DP->d_name, not including
+ its terminating null character.
+
+ _D_ALLOC_NAMLEN (DP) returns a size at least (_D_EXACT_NAMLEN (DP) + 1);
+ that is, the allocation size needed to hold the DP->d_name string.
+ Use this macro when you don't need the exact length, just an upper bound.
+ This macro is less likely to require calling `strlen' than _D_EXACT_NAMLEN.
+ */
+
+#ifdef _DIRENT_HAVE_D_NAMLEN
+#define _D_EXACT_NAMLEN(d) ((d)->d_namlen)
+#define _D_ALLOC_NAMLEN(d) (_D_EXACT_NAMLEN (d) + 1)
+#else
+#define _D_EXACT_NAMLEN(d) (strlen ((d)->d_name))
+#ifdef _DIRENT_HAVE_D_RECLEN
+#define _D_ALLOC_NAMLEN(d) (((char *) (d) + (d)->d_reclen) - &(d)->d_name[0])
+#else
+#define _D_ALLOC_NAMLEN(d) (sizeof (d)->d_name > 1 ? sizeof (d)->d_name : \
+ _D_EXACT_NAMLEN (d) + 1)
+#endif
+#endif
+
+
#ifdef __USE_BSD
/* File types for `d_type'. */
enum