diff options
Diffstat (limited to 'dirent/dirent.h')
| -rw-r--r-- | dirent/dirent.h | 52 |
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 |