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bug#12958: Assume POSIX 1003.1-1988 or later for dirent.h.
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From: |
Paul Eggert |
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Subject: |
bug#12958: Assume POSIX 1003.1-1988 or later for dirent.h. |
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Date: |
Wed, 21 Nov 2012 20:16:23 -0800 |
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User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/17.0 Thunderbird/17.0 |
Here's a patch that I'd like to install to simplify Emacs based
on assuming that the underyling system supports POSIX 1003.1-1988
or later with respect to dirent.h. This is universal these days
on GNUish hosts. I'm CC'ing this to Eli, as this affects the
Microsoft port, by updating it a bit to use the POSIXish
"struct dirent" rather than the pre-POSIX "struct direct".
I have tested this on GNU/Linux but not on Microsoft.
=== modified file 'ChangeLog'
--- ChangeLog 2012-11-21 21:06:52 +0000
+++ ChangeLog 2012-11-22 04:03:01 +0000
@@ -1,3 +1,8 @@
+2012-11-22 Paul Eggert <eggert@cs.ucla.edu>
+
+ Assume POSIX 1003.1-1988 or later for dirent.h.
+ * configure.ac: Do not check for dirent.h or closdir.
+
2012-11-21 Paul Eggert <eggert@cs.ucla.edu>
Assume POSIX 1003.1-1988 or later for unistd.h (Bug#12945).
=== modified file 'admin/CPP-DEFINES'
--- admin/CPP-DEFINES 2012-11-21 21:06:52 +0000
+++ admin/CPP-DEFINES 2012-11-22 04:03:01 +0000
@@ -118,7 +118,6 @@
HAVE_CFSETSPEED
HAVE_CLOCK_GETTIME
HAVE_CLOCK_SETTIME
-HAVE_CLOSEDIR
HAVE_COFF_H
HAVE_COM_ERR_H
HAVE_COPYSIGN
@@ -143,7 +142,6 @@
HAVE_DEV_PTMX
HAVE_DIALOGS
HAVE_DIFFTIME
-HAVE_DIRENT_H
HAVE_DUP2
HAVE_ENDGRENT
HAVE_ENDPWENT
=== modified file 'admin/ChangeLog'
--- admin/ChangeLog 2012-11-21 21:06:52 +0000
+++ admin/ChangeLog 2012-11-22 04:03:01 +0000
@@ -1,3 +1,9 @@
+2012-11-22 Paul Eggert <eggert@cs.ucla.edu>
+
+ Assume POSIX 1003.1-1988 or later for dirent.h.
+ * CPP-DEFINES (HAVE_CLOSEDIR, HAVE_DIRENT_H): Remove.
+ * notes/copyright: Adjust to src/ndir.h -> nt/inc/dirent.h renaming.
+
2012-11-21 Paul Eggert <eggert@cs.ucla.edu>
Assume POSIX 1003.1-1988 or later for unistd.h (Bug#12945).
=== modified file 'admin/notes/copyright'
--- admin/notes/copyright 2012-01-19 07:21:25 +0000
+++ admin/notes/copyright 2012-11-22 04:03:01 +0000
@@ -380,7 +380,7 @@
src/gmalloc.c
- contains numerous copyrights from the GNU C library. Leave them alone.
-src/ndir.h
+nt/inc/dirent.h
- see comments below. This file is OK to be released with Emacs
22, but we may want to revisit it afterwards.
@@ -429,7 +429,7 @@
File says it's in the public domain, but that might not make it so.
etc/e/eterm-color.ti
-src/ndir.h
+nt/inc/dirent.h
On legal advice from Matt Norwood, the following comment was added
to these files in Feb/Mar 2007:
=== modified file 'configure.ac'
--- configure.ac 2012-11-21 21:06:52 +0000
+++ configure.ac 2012-11-22 04:03:01 +0000
@@ -1289,7 +1289,7 @@
linux/version.h sys/systeminfo.h
coff.h pty.h
sys/vlimit.h sys/resource.h
- sys/utsname.h pwd.h utmp.h dirent.h util.h)
+ sys/utsname.h pwd.h utmp.h util.h)
AC_MSG_CHECKING(if personality LINUX32 can be set)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/personality.h>]],
[[personality (PER_LINUX32)]])],
@@ -2891,7 +2891,7 @@
AC_CHECK_FUNCS(gethostname \
-closedir getrusage get_current_dir_name \
+getrusage get_current_dir_name \
lrand48 \
select getpagesize setlocale \
utimes getrlimit setrlimit shutdown getaddrinfo \
=== modified file 'nt/ChangeLog'
--- nt/ChangeLog 2012-11-21 21:06:52 +0000
+++ nt/ChangeLog 2012-11-22 04:03:01 +0000
@@ -1,3 +1,10 @@
+2012-11-22 Paul Eggert <eggert@cs.ucla.edu>
+
+ Assume POSIX 1003.1-1988 or later for dirent.h.
+ * inc/dirent.h: Rename from ../src/ndir.h, with these changes:
+ (struct dirent): Rename from struct direct. All uses changed.
+ * inc/sys/dir.h: Remove.
+
2012-11-21 Paul Eggert <eggert@cs.ucla.edu>
Assume POSIX 1003.1-1988 or later for unistd.h (Bug#12945).
=== renamed file 'src/ndir.h' => 'nt/inc/dirent.h'
--- src/ndir.h 2011-01-15 23:16:57 +0000
+++ nt/inc/dirent.h 2012-11-22 04:03:01 +0000
@@ -1,7 +1,5 @@
/*
- <dir.h> -- definitions for 4.2BSD-compatible directory access
-
- last edit: 09-Jul-1983 D A Gwyn
+ <dirent.h> -- definitions for POSIX-compatible directory access
* The code here is forced by the interface, and is not subject to
* copyright, constituting the only possible expression of the
@@ -16,7 +14,7 @@
#endif /* not WINDOWSNT */
/* NOTE: MAXNAMLEN must be one less than a multiple of 4 */
-struct direct /* data from readdir() */
+struct dirent /* data from readdir() */
{
long d_ino; /* inode number of entry */
unsigned short d_reclen; /* length of this record */
@@ -33,9 +31,8 @@
} DIR; /* stream data from opendir() */
extern DIR *opendir (char *);
-extern struct direct *readdir (DIR *);
+extern struct dirent *readdir (DIR *);
extern void seekdir (DIR *, long);
extern void closedir (DIR *);
#define rewinddir( dirp ) seekdir( dirp, 0L )
-
=== removed file 'nt/inc/sys/dir.h'
--- nt/inc/sys/dir.h 2011-01-15 23:16:57 +0000
+++ nt/inc/sys/dir.h 1970-01-01 00:00:00 +0000
@@ -1,6 +0,0 @@
-/*
- * map sys\dir.h to ..\..\..\src\ndir.h
- */
-
-#include "..\..\..\src\ndir.h"
-
=== modified file 'src/ChangeLog'
--- src/ChangeLog 2012-11-22 03:56:38 +0000
+++ src/ChangeLog 2012-11-22 04:06:38 +0000
@@ -1,3 +1,20 @@
+2012-11-22 Paul Eggert <eggert@cs.ucla.edu>
+
+ Assume POSIX 1003.1-1988 or later for dirent.h.
+ * dired.c: Assume HAVE_DIRENT_H.
+ (NAMLEN): Remove, replacing with ...
+ (dirent_namelen): New function. All uses changed. Use the GNU macro
+ _D_EXACT_NAMELEN if available, as it's faster than strlen.
+ (DIRENTRY): Remove, replacing all uses with 'struct dirent'.
+ (DIRENTRY_NONEMPTY): Remove, replacing with ...
+ (dirent_nonempty): New function. All uses changed.
+ * makefile.w32-in (DIR_H): Now just dirent.h, not sys/dir.h and ndir.h.
+ ($(BLD)/w32.$(O)): Depend on $(DIR_H), not $(SRC)/ndir.h.
+ * ndir.h: Rename to ../nt/inc/dirent.h.
+ * sysdep.h (closedir) [!HAVE_CLOSEDIR]: Remove.
+ Do not include <dirent.h>; no longer needed.
+ * w32.c: Include <dirent.h> rather than "ndir.h".
+
2012-11-22 Eli Zaretskii <eliz@gnu.org>
* w32.c (getcwd): Fix the 2nd argument type, to prevent conflicts
=== modified file 'src/dired.c'
--- src/dired.c 2012-10-01 02:07:14 +0000
+++ src/dired.c 2012-11-22 04:03:01 +0000
@@ -31,44 +31,10 @@
#include <errno.h>
#include <unistd.h>
-/* The d_nameln member of a struct dirent includes the '\0' character
- on some systems, but not on others. What's worse, you can't tell
- at compile-time which one it will be, since it really depends on
- the sort of system providing the filesystem you're reading from,
- not the system you are running on. Paul Eggert
- <eggert@bi.twinsun.com> says this occurs when Emacs is running on a
- SunOS 4.1.2 host, reading a directory that is remote-mounted from a
- Solaris 2.1 host and is in a native Solaris 2.1 filesystem.
-
- Since applying strlen to the name always works, we'll just do that. */
-#define NAMLEN(p) strlen (p->d_name)
-
-#ifdef HAVE_DIRENT_H
-
#include <dirent.h>
-#define DIRENTRY struct dirent
-
-#else /* not HAVE_DIRENT_H */
-
-#include <sys/dir.h>
-#include <sys/stat.h>
-
-#define DIRENTRY struct direct
-
-extern DIR *opendir (char *);
-extern struct direct *readdir (DIR *);
-
-#endif /* HAVE_DIRENT_H */
-
#include <filemode.h>
#include <stat-time.h>
-#ifdef MSDOS
-#define DIRENTRY_NONEMPTY(p) ((p)->d_name[0] != 0)
-#else
-#define DIRENTRY_NONEMPTY(p) ((p)->d_ino)
-#endif
-
#include "lisp.h"
#include "systime.h"
#include "character.h"
@@ -88,6 +54,28 @@
static ptrdiff_t scmp (const char *, const char *, ptrdiff_t);
+/* Return the number of bytes in DP's name. */
+static ptrdiff_t
+dirent_namelen (struct dirent *dp)
+{
+#ifdef _D_EXACT_NAMLEN
+ return _D_EXACT_NAMLEN (dp);
+#else
+ return strlen (dp->d_name);
+#endif
+}
+
+/* Return true if DP represents a real directory entry. */
+static bool
+dirent_nonempty (struct dirent *dp)
+{
+#ifdef MSDOS
+ return dp->d_name[0] != 0;
+#else
+ return 1;
+#endif
+}
+
#ifdef WINDOWSNT
Lisp_Object
directory_files_internal_w32_unwind (Lisp_Object arg)
@@ -124,7 +112,7 @@
bool needsep = 0;
ptrdiff_t count = SPECPDL_INDEX ();
struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5;
- DIRENTRY *dp;
+ struct dirent *dp;
#ifdef WINDOWSNT
Lisp_Object w32_save = Qnil;
#endif
@@ -225,14 +213,14 @@
if (dp == NULL)
break;
- if (DIRENTRY_NONEMPTY (dp))
+ if (dirent_nonempty (dp))
{
ptrdiff_t len;
bool wanted = 0;
Lisp_Object name, finalname;
struct gcpro gcpro1, gcpro2;
- len = NAMLEN (dp);
+ len = dirent_namelen (dp);
name = finalname = make_unibyte_string (dp->d_name, len);
GCPRO2 (finalname, name);
@@ -442,7 +430,8 @@
return file_name_completion (file, directory, 1, Qnil);
}
-static int file_name_completion_stat (Lisp_Object dirname, DIRENTRY *dp,
struct stat *st_addr);
+static int file_name_completion_stat (Lisp_Object dirname, struct dirent *dp,
+ struct stat *st_addr);
static Lisp_Object Qdefault_directory;
static Lisp_Object
@@ -499,7 +488,7 @@
/* (att3b compiler bug requires do a null comparison this way) */
while (1)
{
- DIRENTRY *dp;
+ struct dirent *dp;
ptrdiff_t len;
bool canexclude = 0;
@@ -517,10 +506,10 @@
if (!dp) break;
- len = NAMLEN (dp);
+ len = dirent_namelen (dp);
QUIT;
- if (! DIRENTRY_NONEMPTY (dp)
+ if (! dirent_nonempty (dp)
|| len < SCHARS (encoded_file)
|| 0 <= scmp (dp->d_name, SSDATA (encoded_file),
SCHARS (encoded_file)))
@@ -806,9 +795,10 @@
}
static int
-file_name_completion_stat (Lisp_Object dirname, DIRENTRY *dp, struct stat
*st_addr)
+file_name_completion_stat (Lisp_Object dirname, struct dirent *dp,
+ struct stat *st_addr)
{
- ptrdiff_t len = NAMLEN (dp);
+ ptrdiff_t len = dirent_namelen (dp);
ptrdiff_t pos = SCHARS (dirname);
int value;
USE_SAFE_ALLOCA;
=== modified file 'src/makefile.w32-in'
--- src/makefile.w32-in 2012-11-17 23:16:24 +0000
+++ src/makefile.w32-in 2012-11-22 04:03:01 +0000
@@ -413,8 +413,7 @@
$(MS_W32_H)
CONFIG_H = $(SRC)/config.h \
$(CONF_POST_H)
-DIR_H = $(NT_INC)/sys/dir.h \
- $(SRC)/ndir.h
+DIR_H = $(NT_INC)/dirent.h
W32GUI_H = $(SRC)/w32gui.h \
$(SYSTIME_H)
DISPEXTERN_H = $(SRC)/dispextern.h \
@@ -1175,7 +1174,6 @@
$(BLD)/w32.$(O) : \
$(SRC)/w32.c \
- $(SRC)/ndir.h \
$(SRC)/w32.h \
$(SRC)/w32common.h \
$(SRC)/w32heap.h \
@@ -1187,6 +1185,7 @@
$(CAREADLINKAT_H) \
$(CODING_H) \
$(CONFIG_H) \
+ $(DIR_H) \
$(DISPEXTERN_H) \
$(GRP_H) \
$(LISP_H) \
=== modified file 'src/sysdep.c'
--- src/sysdep.c 2012-11-21 21:06:52 +0000
+++ src/sysdep.c 2012-11-22 04:03:01 +0000
@@ -2220,28 +2220,6 @@
&emacs_norealloc_allocator, careadlinkatcwd);
}
-/* Directory routines for systems that don't have them. */
-
-#ifdef HAVE_DIRENT_H
-
-#include <dirent.h>
-
-#if !defined (HAVE_CLOSEDIR)
-
-int
-closedir (DIR *dirp /* stream from opendir */)
-{
- int rtnval;
-
- rtnval = emacs_close (dirp->dd_fd);
- xfree (dirp);
-
- return rtnval;
-}
-#endif /* not HAVE_CLOSEDIR */
-#endif /* HAVE_DIRENT_H */
-
-
/* Return a struct timeval that is roughly equivalent to T.
Use the least timeval not less than T.
Return an extremal value if the result would overflow. */
=== modified file 'src/w32.c'
--- src/w32.c 2012-11-22 03:56:38 +0000
+++ src/w32.c 2012-11-22 04:06:38 +0000
@@ -179,7 +179,7 @@
#undef sendto
#include "w32.h"
-#include "ndir.h"
+#include <dirent.h>
#include "w32common.h"
#include "w32heap.h"
#include "w32select.h"
@@ -2448,7 +2448,7 @@
and readdir. We can't use the procedures supplied in sysdep.c,
so we provide them here. */
-struct direct dir_static; /* simulated directory contents */
+struct dirent dir_static; /* simulated directory contents */
static HANDLE dir_find_handle = INVALID_HANDLE_VALUE;
static int dir_is_fat;
static char dir_pathname[MAXPATHLEN+1];
@@ -2518,7 +2518,7 @@
xfree ((char *) dirp);
}
-struct direct *
+struct dirent *
readdir (DIR *dirp)
{
int downcase = !NILP (Vw32_downcase_file_names);
@@ -2572,7 +2572,7 @@
downcase = 1; /* 8+3 aliases are returned in all caps */
}
dir_static.d_namlen = strlen (dir_static.d_name);
- dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3 +
+ dir_static.d_reclen = sizeof (struct dirent) - MAXNAMLEN + 3 +
dir_static.d_namlen - dir_static.d_namlen % 4;
/* If the file name in cFileName[] includes `?' characters, it means
- bug#12958: Assume POSIX 1003.1-1988 or later for dirent.h.,
Paul Eggert <=