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Re: AC_HEADER_DIRENT


From: Paul Eggert
Subject: Re: AC_HEADER_DIRENT
Date: Mon, 10 Jul 2006 23:10:46 -0700
User-agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux)

"Derek R. Price" <address@hidden> writes:

> Patch attached.

Thanks.  I found a few other instances of checking for dirent.h,
and a couple of places we need to include <sys/types.h> before
<dirent.h> (this is for POSIX before 2001).  I installed this
into gnulib, and will propagate it into coreutils shortly.

Index: lib/ChangeLog
===================================================================
RCS file: /cvsroot/gnulib/gnulib/lib/ChangeLog,v
retrieving revision 1.1197
diff -p -u -r1.1197 ChangeLog
--- lib/ChangeLog       9 Jul 2006 10:18:17 -0000       1.1197
+++ lib/ChangeLog       11 Jul 2006 06:00:18 -0000
@@ -1,3 +1,11 @@
+2006-07-10  Derek R. Price  <address@hidden>
+
+       * backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
+       Ignore the obsolescent !HAVE_DIRENT_H case.  Consolidate NAMLEN
+       macros into the GNU _D_EXACT_NAMLEN.
+       * savedir.c:  Likewise.
+       (savedirstream): Use _D_EXACT_NAMLEN in preference to strlen.
+
 2006-07-09  Jim Meyering  <address@hidden>
 
        * argp-pv.c: Remove a doubled word in a comment.
Index: lib/backupfile.c
===================================================================
RCS file: /cvsroot/gnulib/gnulib/lib/backupfile.c,v
retrieving revision 1.50
diff -p -u -r1.50 backupfile.c
--- lib/backupfile.c    6 Jul 2006 23:29:27 -0000       1.50
+++ lib/backupfile.c    11 Jul 2006 06:00:18 -0000
@@ -41,15 +41,10 @@
 
 #include <unistd.h>
 
-#if HAVE_DIRENT_H
-# include <dirent.h>
-# define NLENGTH(direct) strlen ((direct)->d_name)
-#else
-# define dirent direct
-# define NLENGTH(direct) ((size_t) (direct)->d_namlen)
-# include <ndir.h>
+#include <dirent.h>
+#ifndef _D_EXACT_NAMLEN
+# define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name)
 #endif
-
 #if D_INO_IN_DIRENT
 # define REAL_DIR_ENTRY(dp) ((dp)->d_ino != 0)
 #else
@@ -211,7 +206,7 @@ numbered_backup (char **buffer, size_t b
       size_t versionlen;
       size_t new_buflen;
 
-      if (! REAL_DIR_ENTRY (dp) || NLENGTH (dp) < baselen + 4)
+      if (! REAL_DIR_ENTRY (dp) || _D_EXACT_NAMLEN (dp) < baselen + 4)
        continue;
 
       if (memcmp (buf + base_offset, dp->d_name, baselen + 2) != 0)
Index: lib/dirfd.h
===================================================================
RCS file: /cvsroot/gnulib/gnulib/lib/dirfd.h,v
retrieving revision 1.7
diff -p -u -r1.7 dirfd.h
--- lib/dirfd.h 6 Jul 2006 23:29:27 -0000       1.7
+++ lib/dirfd.h 11 Jul 2006 06:00:18 -0000
@@ -19,12 +19,7 @@
 
 #include <sys/types.h>
 
-#if HAVE_DIRENT_H
-# include <dirent.h>
-#else
-# define dirent direct
-# include <ndir.h>
-#endif
+#include <dirent.h>
 
 #ifndef HAVE_DECL_DIRFD
 "this configure-time declaration test was not run"
Index: lib/fts.c
===================================================================
RCS file: /cvsroot/gnulib/gnulib/lib/fts.c,v
retrieving revision 1.12
diff -p -u -r1.12 fts.c
--- lib/fts.c   6 Jul 2006 23:29:27 -0000       1.12
+++ lib/fts.c   11 Jul 2006 06:00:18 -0000
@@ -75,17 +75,9 @@ static char sccsid[] = "@(#)fts.c    8.6 (B
 # include "lstat.h"
 #endif
 
-#if HAVE_DIRENT_H || _LIBC
-# include <dirent.h>
-# ifdef _D_EXACT_NAMLEN
-#  define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent)
-# else
-#  define NAMLEN(dirent) strlen ((dirent)->d_name)
-# endif
-#else
-# define dirent direct
-# define NAMLEN(dirent) (dirent)->d_namlen
-# include <ndir.h>
+#include <dirent.h>
+#ifndef _D_EXACT_NAMLEN
+# define _D_EXACT_NAMLEN(dirent) strlen ((dirent)->d_name)
 #endif
 
 #ifdef _LIBC
@@ -829,11 +821,13 @@ fts_build (register FTS *sp, int type)
                if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name))
                        continue;
 
-               if ((p = fts_alloc(sp, dp->d_name, NAMLEN (dp))) == NULL)
+               if ((p = fts_alloc (sp, dp->d_name,
+                                   _D_EXACT_NAMLEN (dp))) == NULL)
                        goto mem1;
-               if (NAMLEN (dp) >= maxlen) {/* include space for NUL */
+               if (_D_EXACT_NAMLEN (dp) >= maxlen) {
+                       /* include space for NUL */
                        oldaddr = sp->fts_path;
-                       if (! fts_palloc(sp, NAMLEN (dp) + len + 1)) {
+                       if (! fts_palloc(sp, _D_EXACT_NAMLEN (dp) + len + 1)) {
                                /*
                                 * No more memory.  Save
                                 * errno, free up the current structure and the
@@ -858,7 +852,7 @@ mem1:                               saved_errno = errno;
                        maxlen = sp->fts_pathlen - len;
                }
 
-               new_len = len + NAMLEN (dp);
+               new_len = len + _D_EXACT_NAMLEN (dp);
                if (new_len < len) {
                        /*
                         * In the unlikely even that we would end up
Index: lib/getcwd.c
===================================================================
RCS file: /cvsroot/gnulib/gnulib/lib/getcwd.c,v
retrieving revision 1.13
diff -p -u -r1.13 getcwd.c
--- lib/getcwd.c        6 Jul 2006 23:29:27 -0000       1.13
+++ lib/getcwd.c        11 Jul 2006 06:00:18 -0000
@@ -36,13 +36,7 @@
 # define __set_errno(val) (errno = (val))
 #endif
 
-#if HAVE_DIRENT_H || _LIBC
-# include <dirent.h>
-#else
-# define dirent direct
-# define _D_EXACT_NAMLEN(d) (d)->d_namlen
-# include <ndir.h>
-#endif
+#include <dirent.h>
 #ifndef _D_EXACT_NAMLEN
 # define _D_EXACT_NAMLEN(d) strlen ((d)->d_name)
 #endif
Index: lib/glob.c
===================================================================
RCS file: /cvsroot/gnulib/gnulib/lib/glob.c,v
retrieving revision 1.7
diff -p -u -r1.7 glob.c
--- lib/glob.c  6 Jul 2006 23:29:27 -0000       1.7
+++ lib/glob.c  11 Jul 2006 06:00:18 -0000
@@ -47,20 +47,12 @@
 # define __set_errno(val) errno = (val)
 #endif
 
-#if defined HAVE_DIRENT_H || defined __GNU_LIBRARY__
-# include <dirent.h>
-# define NAMLEN(dirent) strlen((dirent)->d_name)
-#else
-# define dirent direct
-# define NAMLEN(dirent) (dirent)->d_namlen
-# include <ndir.h>
-#endif
+#include <dirent.h>
 
 
 /* In GNU systems, <dirent.h> defines this macro for us.  */
-#ifdef _D_NAMLEN
-# undef NAMLEN
-# define NAMLEN(d) _D_NAMLEN(d)
+#ifndef _D_EXACT_NAMLEN
+# define _D_EXACT_NAMLEN(dirent) strlen ((dirent)->d_name)
 #endif
 
 /* When used in the GNU libc the symbol _DIRENT_HAVE_D_TYPE is available
@@ -86,13 +78,6 @@
 
 /* If the system has the `struct dirent64' type we use it internally.  */
 #if defined _LIBC && !defined COMPILE_GLOB64
-# if defined HAVE_DIRENT_H || defined __GNU_LIBRARY__
-#  define CONVERT_D_NAMLEN(d64, d32)
-# else
-#  define CONVERT_D_NAMLEN(d64, d32) \
-  (d64)->d_namlen = (d32)->d_namlen;
-# endif
-
 # if (defined POSIX || defined WINDOWS32) && !defined __GNU_LIBRARY__
 #  define CONVERT_D_INO(d64, d32)
 # else
@@ -109,7 +94,6 @@
 
 # define CONVERT_DIRENT_DIRENT64(d64, d32) \
   memcpy ((d64)->d_name, (d32)->d_name, NAMLEN (d32) + 1);                   \
-  CONVERT_D_NAMLEN (d64, d32)                                                \
   CONVERT_D_INO (d64, d32)                                                   \
   CONVERT_D_TYPE (d64, d32)
 #endif
Index: lib/glob_.h
===================================================================
RCS file: /cvsroot/gnulib/gnulib/lib/glob_.h,v
retrieving revision 1.5
diff -p -u -r1.5 glob_.h
--- lib/glob_.h 10 Jan 2006 21:49:07 -0000      1.5
+++ lib/glob_.h 11 Jul 2006 06:00:18 -0000
@@ -46,10 +46,6 @@
 #endif
 
 
-#ifndef HAVE_DIRENT_H
-# define dirent direct
-#endif
-
 #define glob rpl_glob
 #define globfree rpl_globfree
 #define glob_pattern_p rpl_glob_pattern_p
Index: lib/savedir.c
===================================================================
RCS file: /cvsroot/gnulib/gnulib/lib/savedir.c,v
retrieving revision 1.30
diff -p -u -r1.30 savedir.c
--- lib/savedir.c       6 Jul 2006 23:29:27 -0000       1.30
+++ lib/savedir.c       11 Jul 2006 06:00:19 -0000
@@ -29,11 +29,9 @@
 
 #include <errno.h>
 
-#if HAVE_DIRENT_H
-# include <dirent.h>
-#else
-# define dirent direct
-# include <ndir.h>
+#include <dirent.h>
+#ifndef _D_EXACT_NAMLEN
+# define _D_EXACT_NAMLEN(dp)   strlen ((dp)->d_name)
 #endif
 
 #include <stddef.h>
@@ -81,7 +79,7 @@ savedirstream (DIR *dirp)
       entry = dp->d_name;
       if (entry[entry[0] != '.' ? 0 : entry[1] != '.' ? 1 : 2] != '\0')
        {
-         size_t entry_size = strlen (entry) + 1;
+         size_t entry_size = _D_EXACT_NAMLEN (dp) + 1;
          if (used + entry_size < used)
            xalloc_die ();
          if (allocated <= used + entry_size)
Index: m4/ChangeLog
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/ChangeLog,v
retrieving revision 1.867
diff -p -u -r1.867 ChangeLog
--- m4/ChangeLog        11 Jul 2006 03:30:49 -0000      1.867
+++ m4/ChangeLog        11 Jul 2006 06:00:19 -0000
@@ -1,3 +1,11 @@
+2006-07-10  Derek R. Price  <address@hidden>
+       and Paul Eggert  <address@hidden>
+
+       * backupfile.m4, d-ino.m4, d-type.m4, dirfd.m4, fts.m4, getcwd.m4:
+       * savedir.m4:
+       Ignore the obsolescent !HAVE_DIRENT_H case.  Consolidate NAMLEN
+       macros into the GNU _D_EXACT_NAMLEN.
+
 2006-07-10  Paul Eggert  <address@hidden>
 
        * stdint.m4 (gl_STDINT_H): Like yesterday's change to
Index: m4/backupfile.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/backupfile.m4,v
retrieving revision 1.11
diff -p -u -r1.11 backupfile.m4
--- m4/backupfile.m4    6 Jul 2006 23:29:27 -0000       1.11
+++ m4/backupfile.m4    11 Jul 2006 06:00:19 -0000
@@ -1,4 +1,4 @@
-# backupfile.m4 serial 10
+# backupfile.m4 serial 11
 dnl Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -10,7 +10,6 @@ AC_DEFUN([gl_BACKUPFILE],
   AC_LIBOBJ([backupfile])
 
   dnl Prerequisites of lib/backupfile.c.
-  AC_CHECK_HEADERS_ONCE([dirent.h])
   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])
   AC_REQUIRE([gl_AC_DOS])
   AC_REQUIRE([AC_SYS_LONG_FILE_NAMES])
Index: m4/d-ino.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/d-ino.m4,v
retrieving revision 1.9
diff -p -u -r1.9 d-ino.m4
--- m4/d-ino.m4 6 Jul 2006 23:29:27 -0000       1.9
+++ m4/d-ino.m4 11 Jul 2006 06:00:19 -0000
@@ -13,18 +13,12 @@ dnl
 # with or without modifications, as long as this notice is preserved.
 
 AC_DEFUN([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO],
-  [AC_CHECK_HEADERS_ONCE([dirent.h])dnl
-   AC_CACHE_CHECK([for d_ino member in directory struct],
+  [AC_CACHE_CHECK([for d_ino member in directory struct],
                  jm_cv_struct_dirent_d_ino,
      [AC_TRY_LINK(dnl
        [
 #include <sys/types.h>
-#ifdef HAVE_DIRENT_H
-# include <dirent.h>
-#else
-# define dirent direct
-# include <ndir.h>
-#endif
+#include <dirent.h>
        ],
        [struct dirent dp; dp.d_ino = 0;],
 
Index: m4/d-type.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/d-type.m4,v
retrieving revision 1.10
diff -p -u -r1.10 d-type.m4
--- m4/d-type.m4        6 Jul 2006 23:29:27 -0000       1.10
+++ m4/d-type.m4        11 Jul 2006 06:00:19 -0000
@@ -13,18 +13,12 @@ dnl
 # with or without modifications, as long as this notice is preserved.
 
 AC_DEFUN([gl_CHECK_TYPE_STRUCT_DIRENT_D_TYPE],
-  [AC_CHECK_HEADERS_ONCE([dirent.h])dnl
-   AC_CACHE_CHECK([for d_type member in directory struct],
+  [AC_CACHE_CHECK([for d_type member in directory struct],
                  jm_cv_struct_dirent_d_type,
      [AC_TRY_LINK(dnl
        [
 #include <sys/types.h>
-#ifdef HAVE_DIRENT_H
-# include <dirent.h>
-#else
-# define dirent direct
-# include <ndir.h>
-#endif
+#include <dirent.h>
        ],
        [struct dirent dp; dp.d_type = 0;],
 
Index: m4/dirfd.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/dirfd.m4,v
retrieving revision 1.20
diff -p -u -r1.20 dirfd.m4
--- m4/dirfd.m4 6 Jul 2006 23:29:27 -0000       1.20
+++ m4/dirfd.m4 11 Jul 2006 06:00:19 -0000
@@ -1,4 +1,4 @@
-#serial 12   -*- Autoconf -*-
+#serial 13   -*- Autoconf -*-
 
 dnl Find out how to get the file descriptor associated with an open DIR*.
 
@@ -17,22 +17,16 @@ AC_DEFUN([gl_FUNC_DIRFD],
   dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
   AC_REQUIRE([AC_PROG_CPP])
   AC_REQUIRE([AC_PROG_EGREP])
-  AC_CHECK_HEADERS_ONCE([dirent.h])dnl
-
-  dirfd_headers='
-#if HAVE_DIRENT_H
-# include <dirent.h>
-#else
-# define dirent direct
-# include <ndir.h>
-#endif
-'
   AC_CHECK_FUNCS(dirfd)
-  AC_CHECK_DECLS([dirfd], , , $dirfd_headers)
+  AC_CHECK_DECLS([dirfd], , ,
+    [#include <sys/types.h>
+     #include <dirent.h>])
 
   AC_CACHE_CHECK([whether dirfd is a macro],
     gl_cv_func_dirfd_macro,
-    [AC_EGREP_CPP([dirent_header_defines_dirfd], [$dirfd_headers
+    [AC_EGREP_CPP([dirent_header_defines_dirfd], [
+#include <sys/types.h>
+#include <dirent.h>
 #ifdef dirfd
  dirent_header_defines_dirfd
 #endif],
@@ -53,8 +47,8 @@ AC_DEFUN([gl_FUNC_DIRFD],
 
          CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr"
          AC_TRY_COMPILE(
-           [$dirfd_headers
-           ],
+           [#include <sys/types.h>
+            #include <dirent.h>],
            [DIR *dir_p = opendir("."); (void) dir_p->DIR_FD_MEMBER_NAME;],
            dir_fd_found=yes
          )
Index: m4/fts.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/fts.m4,v
retrieving revision 1.7
diff -p -u -r1.7 fts.m4
--- m4/fts.m4   6 Jul 2006 23:29:27 -0000       1.7
+++ m4/fts.m4   11 Jul 2006 06:00:19 -0000
@@ -1,4 +1,4 @@
-#serial 7
+#serial 9
 dnl Copyright (C) 2005, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -29,5 +29,5 @@ AC_DEFUN([gl_FUNC_FTS_CORE],
   dnl Prerequisites of lib/fts.c.
 
   # Checks for header files.
-  AC_CHECK_HEADERS_ONCE([dirent.h sys/param.h])dnl
+  AC_CHECK_HEADERS_ONCE([sys/param.h])dnl
 ])
Index: m4/getcwd.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/getcwd.m4,v
retrieving revision 1.11
diff -p -u -r1.11 getcwd.m4
--- m4/getcwd.m4        6 Jul 2006 23:29:27 -0000       1.11
+++ m4/getcwd.m4        11 Jul 2006 06:00:19 -0000
@@ -61,7 +61,6 @@ AC_DEFUN([gl_FUNC_GETCWD],
 AC_DEFUN([gl_PREREQ_GETCWD],
 [
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  AC_CHECK_HEADERS_ONCE([dirent.h])dnl
   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])
   :
 ])
Index: m4/glob.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/glob.m4,v
retrieving revision 1.7
diff -p -u -r1.7 glob.m4
--- m4/glob.m4  9 Jul 2006 10:18:17 -0000       1.7
+++ m4/glob.m4  11 Jul 2006 06:00:19 -0000
@@ -1,4 +1,4 @@
-# glob.m4 serial 4
+# glob.m4 serial 5
 dnl Copyright (C) 2005, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -74,7 +74,6 @@ if (glob ("conf*-globtest", 0, NULL, &fo
 AC_DEFUN([gl_PREREQ_GLOB],
 [ AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_TYPE])dnl
   AC_REQUIRE([AC_GNU_SOURCE])dnl
-  AC_CHECK_HEADERS_ONCE([dirent.h])dnl
   AC_CHECK_HEADERS_ONCE([sys/cdefs.h unistd.h])dnl
   AC_CHECK_FUNCS_ONCE([getlogin_r getpwnam_r])dnl
   :])
Index: m4/savedir.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/savedir.m4,v
retrieving revision 1.6
diff -p -u -r1.6 savedir.m4
--- m4/savedir.m4       6 Jul 2006 23:29:27 -0000       1.6
+++ m4/savedir.m4       11 Jul 2006 06:00:19 -0000
@@ -1,4 +1,4 @@
-# savedir.m4 serial 7
+# savedir.m4 serial 8
 dnl Copyright (C) 2002, 2003, 2005, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -8,7 +8,4 @@ AC_DEFUN([gl_SAVEDIR],
 [
   AC_LIBSOURCES([savedir.c, savedir.h])
   AC_LIBOBJ([savedir])
-
-  dnl Prerequisites of lib/savedir.c.
-  AC_CHECK_HEADERS_ONCE([dirent.h])dnl
 ])




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