[ChangeLog]

Work around some portability problems with symlinks.
* Makefile.in (GNULIB_MODULES): Add lstat, readlink, symlink.
* configure.in (lstat, HAVE_LSTAT): Remove special hack.
* lib/lstat.c, lib/readlink.c, lib/stat.c, lib/symlink.c:
* m4/dos.m4, m4/lstat.m4, m4/readlink.m4, m4/stat.m4, m4/symlink.m4:
New files, automatically generated from gnulib.
* aclocal.m4, configure, lib/Makefile.in, lib/gnulib.mk:
* lib/stdlib.in.h, m4/gl-comp.m4, m4/stdlib_h.m4: Regenerate.

2011-02-22  Paul Eggert  <eggert@cs.ucla.edu>
[src/ChangeLog]
Work around some portability problems with symlinks.
* fileio.c (Frename_file, Fmake_symbolic_link, Ffile_symlink_p):
Simplify the code by assuming that the readlink and symlink calls
exist, even if they always fail on this host.
(Ffile_readable_p): Likewise, for fifos.
* config.in: Regenerate.

7 files changed, 427 insertions, 15 deletions

diff --git a/lib/Makefile.in b/lib/Makefile.in
index 48e7b1d6507..e9b9f2eb86e 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -24,7 +24,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk --no-libtool --macro-prefix=gl --no-vc-files crypto/md5 dtoastr filemode getloadavg getopt-gnu ignore-value mktime strftime sys_stat
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk --no-libtool --macro-prefix=gl --no-vc-files crypto/md5 dtoastr filemode getloadavg getopt-gnu ignore-value lstat mktime readlink strftime symlink sys_stat
 
 VPATH = @srcdir@
 pkgdatadir = $(datadir)/@PACKAGE@
@@ -50,16 +50,18 @@ DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in \
 subdir = lib
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/00gnulib.m4 \
-        $(top_srcdir)/m4/c-strtod.m4 $(top_srcdir)/m4/extensions.m4 \
-        $(top_srcdir)/m4/filemode.m4 $(top_srcdir)/m4/getloadavg.m4 \
-        $(top_srcdir)/m4/getopt.m4 $(top_srcdir)/m4/gl-comp.m4 \
-        $(top_srcdir)/m4/gnulib-common.m4 \
+        $(top_srcdir)/m4/c-strtod.m4 $(top_srcdir)/m4/dos.m4 \
+        $(top_srcdir)/m4/extensions.m4 $(top_srcdir)/m4/filemode.m4 \
+        $(top_srcdir)/m4/getloadavg.m4 $(top_srcdir)/m4/getopt.m4 \
+        $(top_srcdir)/m4/gl-comp.m4 $(top_srcdir)/m4/gnulib-common.m4 \
         $(top_srcdir)/m4/include_next.m4 $(top_srcdir)/m4/longlong.m4 \
-        $(top_srcdir)/m4/md5.m4 $(top_srcdir)/m4/mktime.m4 \
-        $(top_srcdir)/m4/multiarch.m4 $(top_srcdir)/m4/st_dm_mode.m4 \
-        $(top_srcdir)/m4/stdbool.m4 $(top_srcdir)/m4/stddef_h.m4 \
-        $(top_srcdir)/m4/stdint.m4 $(top_srcdir)/m4/stdlib_h.m4 \
-        $(top_srcdir)/m4/strftime.m4 $(top_srcdir)/m4/sys_stat_h.m4 \
+        $(top_srcdir)/m4/lstat.m4 $(top_srcdir)/m4/md5.m4 \
+        $(top_srcdir)/m4/mktime.m4 $(top_srcdir)/m4/multiarch.m4 \
+        $(top_srcdir)/m4/readlink.m4 $(top_srcdir)/m4/st_dm_mode.m4 \
+        $(top_srcdir)/m4/stat.m4 $(top_srcdir)/m4/stdbool.m4 \
+        $(top_srcdir)/m4/stddef_h.m4 $(top_srcdir)/m4/stdint.m4 \
+        $(top_srcdir)/m4/stdlib_h.m4 $(top_srcdir)/m4/strftime.m4 \
+        $(top_srcdir)/m4/symlink.m4 $(top_srcdir)/m4/sys_stat_h.m4 \
         $(top_srcdir)/m4/time_h.m4 $(top_srcdir)/m4/time_r.m4 \
         $(top_srcdir)/m4/tm_gmtoff.m4 $(top_srcdir)/m4/unistd_h.m4 \
         $(top_srcdir)/m4/wchar_t.m4 $(top_srcdir)/configure.in
@@ -179,6 +181,7 @@ GNULIB_LINKAT = @GNULIB_LINKAT@
 GNULIB_LSEEK = @GNULIB_LSEEK@
 GNULIB_LSTAT = @GNULIB_LSTAT@
 GNULIB_MALLOC_POSIX = @GNULIB_MALLOC_POSIX@
+GNULIB_MBTOWC = @GNULIB_MBTOWC@
 GNULIB_MKDIRAT = @GNULIB_MKDIRAT@
 GNULIB_MKDTEMP = @GNULIB_MKDTEMP@
 GNULIB_MKFIFO = @GNULIB_MKFIFO@
@@ -225,6 +228,7 @@ GNULIB_UNLOCKPT = @GNULIB_UNLOCKPT@
 GNULIB_UNSETENV = @GNULIB_UNSETENV@
 GNULIB_USLEEP = @GNULIB_USLEEP@
 GNULIB_UTIMENSAT = @GNULIB_UTIMENSAT@
+GNULIB_WCTOMB = @GNULIB_WCTOMB@
 GNULIB_WRITE = @GNULIB_WRITE@
 GNULIB__EXIT = @GNULIB__EXIT@
 GNU_OBJC_CFLAGS = @GNU_OBJC_CFLAGS@
@@ -452,6 +456,7 @@ REPLACE_LOCALTIME_R = @REPLACE_LOCALTIME_R@
 REPLACE_LSEEK = @REPLACE_LSEEK@
 REPLACE_LSTAT = @REPLACE_LSTAT@
 REPLACE_MALLOC = @REPLACE_MALLOC@
+REPLACE_MBTOWC = @REPLACE_MBTOWC@
 REPLACE_MKDIR = @REPLACE_MKDIR@
 REPLACE_MKFIFO = @REPLACE_MKFIFO@
 REPLACE_MKNOD = @REPLACE_MKNOD@
@@ -478,6 +483,7 @@ REPLACE_UNLINKAT = @REPLACE_UNLINKAT@
 REPLACE_UNSETENV = @REPLACE_UNSETENV@
 REPLACE_USLEEP = @REPLACE_USLEEP@
 REPLACE_UTIMENSAT = @REPLACE_UTIMENSAT@
+REPLACE_WCTOMB = @REPLACE_WCTOMB@
 REPLACE_WRITE = @REPLACE_WRITE@
 RSVG_CFLAGS = @RSVG_CFLAGS@
 RSVG_LIBS = @RSVG_LIBS@
@@ -600,9 +606,10 @@ BUILT_SOURCES = arg-nonnull.h c++defs.h $(GETOPT_H) $(STDBOOL_H) \
 EXTRA_DIST = $(top_srcdir)/./arg-nonnull.h $(top_srcdir)/./c++defs.h \
         md5.c md5.h ftoastr.c ftoastr.h filemode.c filemode.h \
         getloadavg.c getopt.c getopt.in.h getopt1.c getopt_int.h \
-        intprops.h mktime-internal.h mktime.c stdbool.in.h stddef.in.h \
-        stdint.in.h stdlib.in.h strftime.c strftime.h sys_stat.in.h \
-        time.in.h time_r.c unistd.in.h $(top_srcdir)/./warn-on-use.h
+        intprops.h lstat.c mktime-internal.h mktime.c readlink.c \
+        stat.c stdbool.in.h stddef.in.h stdint.in.h stdlib.in.h \
+        strftime.c strftime.h symlink.c sys_stat.in.h time.in.h \
+        time_r.c unistd.in.h $(top_srcdir)/./warn-on-use.h
 MOSTLYCLEANDIRS = sys
 MOSTLYCLEANFILES = core *.stackdump arg-nonnull.h arg-nonnull.h-t \
         c++defs.h c++defs.h-t getopt.h getopt.h-t stdbool.h \
@@ -615,7 +622,8 @@ libgnu_a_SOURCES = dtoastr.c gettext.h ignore-value.h
 libgnu_a_LIBADD = $(gl_LIBOBJS)
 libgnu_a_DEPENDENCIES = $(gl_LIBOBJS)
 EXTRA_libgnu_a_SOURCES = md5.c ftoastr.c filemode.c getloadavg.c \
-        getopt.c getopt1.c mktime.c strftime.c time_r.c
+        getopt.c getopt1.c lstat.c mktime.c readlink.c stat.c \
+        strftime.c symlink.c time_r.c
 ARG_NONNULL_H = arg-nonnull.h
 CXXDEFS_H = c++defs.h
 WARN_ON_USE_H = warn-on-use.h
@@ -674,9 +682,13 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/getloadavg.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/getopt.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/getopt1.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/lstat.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/md5.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/mktime.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/readlink.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/stat.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/strftime.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/symlink.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/time_r.Po@am__quote@
 
 .c.o:
@@ -1001,6 +1013,7 @@ stdlib.h: stdlib.in.h $(CXXDEFS_H) $(ARG_NONNULL_H) $(WARN_ON_USE_H)
               -e 's|@''GNULIB_GETSUBOPT''@|$(GNULIB_GETSUBOPT)|g' \
               -e 's|@''GNULIB_GRANTPT''@|$(GNULIB_GRANTPT)|g' \
               -e 's|@''GNULIB_MALLOC_POSIX''@|$(GNULIB_MALLOC_POSIX)|g' \
+              -e 's|@''GNULIB_MBTOWC''@|$(GNULIB_MBTOWC)|g' \
               -e 's|@''GNULIB_MKDTEMP''@|$(GNULIB_MKDTEMP)|g' \
               -e 's|@''GNULIB_MKOSTEMP''@|$(GNULIB_MKOSTEMP)|g' \
               -e 's|@''GNULIB_MKOSTEMPS''@|$(GNULIB_MKOSTEMPS)|g' \
@@ -1019,6 +1032,7 @@ stdlib.h: stdlib.in.h $(CXXDEFS_H) $(ARG_NONNULL_H) $(WARN_ON_USE_H)
               -e 's|@''GNULIB_SYSTEM_POSIX''@|$(GNULIB_SYSTEM_POSIX)|g' \
               -e 's|@''GNULIB_UNLOCKPT''@|$(GNULIB_UNLOCKPT)|g' \
               -e 's|@''GNULIB_UNSETENV''@|$(GNULIB_UNSETENV)|g' \
+              -e 's|@''GNULIB_WCTOMB''@|$(GNULIB_WCTOMB)|g' \
               < $(srcdir)/stdlib.in.h | \
           sed -e 's|@''HAVE__EXIT''@|$(HAVE__EXIT)|g' \
               -e 's|@''HAVE_ATOLL''@|$(HAVE_ATOLL)|g' \
@@ -1047,6 +1061,7 @@ stdlib.h: stdlib.in.h $(CXXDEFS_H) $(ARG_NONNULL_H) $(WARN_ON_USE_H)
               -e 's|@''REPLACE_CALLOC''@|$(REPLACE_CALLOC)|g' \
               -e 's|@''REPLACE_CANONICALIZE_FILE_NAME''@|$(REPLACE_CANONICALIZE_FILE_NAME)|g' \
               -e 's|@''REPLACE_MALLOC''@|$(REPLACE_MALLOC)|g' \
+              -e 's|@''REPLACE_MBTOWC''@|$(REPLACE_MBTOWC)|g' \
               -e 's|@''REPLACE_MKSTEMP''@|$(REPLACE_MKSTEMP)|g' \
               -e 's|@''REPLACE_PUTENV''@|$(REPLACE_PUTENV)|g' \
               -e 's|@''REPLACE_REALLOC''@|$(REPLACE_REALLOC)|g' \
@@ -1054,6 +1069,7 @@ stdlib.h: stdlib.in.h $(CXXDEFS_H) $(ARG_NONNULL_H) $(WARN_ON_USE_H)
               -e 's|@''REPLACE_SETENV''@|$(REPLACE_SETENV)|g' \
               -e 's|@''REPLACE_STRTOD''@|$(REPLACE_STRTOD)|g' \
               -e 's|@''REPLACE_UNSETENV''@|$(REPLACE_UNSETENV)|g' \
+              -e 's|@''REPLACE_WCTOMB''@|$(REPLACE_WCTOMB)|g' \
               -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
               -e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \
               -e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)'; \
diff --git a/lib/gnulib.mk b/lib/gnulib.mk
index 32bf5714d17..1d918ff5fae 100644
--- a/lib/gnulib.mk
+++ b/lib/gnulib.mk
@@ -9,7 +9,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk --no-libtool --macro-prefix=gl --no-vc-files crypto/md5 dtoastr filemode getloadavg getopt-gnu ignore-value mktime strftime sys_stat
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk --no-libtool --macro-prefix=gl --no-vc-files crypto/md5 dtoastr filemode getloadavg getopt-gnu ignore-value lstat mktime readlink strftime symlink sys_stat
 
 
 MOSTLYCLEANFILES += core *.stackdump
@@ -151,6 +151,15 @@ EXTRA_DIST += intprops.h
 
 ## end   gnulib module intprops
 
+## begin gnulib module lstat
+
+
+EXTRA_DIST += lstat.c
+
+EXTRA_libgnu_a_SOURCES += lstat.c
+
+## end   gnulib module lstat
+
 ## begin gnulib module mktime
 
 
@@ -160,6 +169,24 @@ EXTRA_libgnu_a_SOURCES += mktime.c
 
 ## end   gnulib module mktime
 
+## begin gnulib module readlink
+
+
+EXTRA_DIST += readlink.c
+
+EXTRA_libgnu_a_SOURCES += readlink.c
+
+## end   gnulib module readlink
+
+## begin gnulib module stat
+
+
+EXTRA_DIST += stat.c
+
+EXTRA_libgnu_a_SOURCES += stat.c
+
+## end   gnulib module stat
+
 ## begin gnulib module stdbool
 
 BUILT_SOURCES += $(STDBOOL_H)
@@ -267,6 +294,7 @@ stdlib.h: stdlib.in.h $(CXXDEFS_H) $(ARG_NONNULL_H) $(WARN_ON_USE_H)
               -e 's|@''GNULIB_GETSUBOPT''@|$(GNULIB_GETSUBOPT)|g' \
               -e 's|@''GNULIB_GRANTPT''@|$(GNULIB_GRANTPT)|g' \
               -e 's|@''GNULIB_MALLOC_POSIX''@|$(GNULIB_MALLOC_POSIX)|g' \
+              -e 's|@''GNULIB_MBTOWC''@|$(GNULIB_MBTOWC)|g' \
               -e 's|@''GNULIB_MKDTEMP''@|$(GNULIB_MKDTEMP)|g' \
               -e 's|@''GNULIB_MKOSTEMP''@|$(GNULIB_MKOSTEMP)|g' \
               -e 's|@''GNULIB_MKOSTEMPS''@|$(GNULIB_MKOSTEMPS)|g' \
@@ -285,6 +313,7 @@ stdlib.h: stdlib.in.h $(CXXDEFS_H) $(ARG_NONNULL_H) $(WARN_ON_USE_H)
               -e 's|@''GNULIB_SYSTEM_POSIX''@|$(GNULIB_SYSTEM_POSIX)|g' \
               -e 's|@''GNULIB_UNLOCKPT''@|$(GNULIB_UNLOCKPT)|g' \
               -e 's|@''GNULIB_UNSETENV''@|$(GNULIB_UNSETENV)|g' \
+              -e 's|@''GNULIB_WCTOMB''@|$(GNULIB_WCTOMB)|g' \
               < $(srcdir)/stdlib.in.h | \
           sed -e 's|@''HAVE__EXIT''@|$(HAVE__EXIT)|g' \
               -e 's|@''HAVE_ATOLL''@|$(HAVE_ATOLL)|g' \
@@ -313,6 +342,7 @@ stdlib.h: stdlib.in.h $(CXXDEFS_H) $(ARG_NONNULL_H) $(WARN_ON_USE_H)
               -e 's|@''REPLACE_CALLOC''@|$(REPLACE_CALLOC)|g' \
               -e 's|@''REPLACE_CANONICALIZE_FILE_NAME''@|$(REPLACE_CANONICALIZE_FILE_NAME)|g' \
               -e 's|@''REPLACE_MALLOC''@|$(REPLACE_MALLOC)|g' \
+              -e 's|@''REPLACE_MBTOWC''@|$(REPLACE_MBTOWC)|g' \
               -e 's|@''REPLACE_MKSTEMP''@|$(REPLACE_MKSTEMP)|g' \
               -e 's|@''REPLACE_PUTENV''@|$(REPLACE_PUTENV)|g' \
               -e 's|@''REPLACE_REALLOC''@|$(REPLACE_REALLOC)|g' \
@@ -320,6 +350,7 @@ stdlib.h: stdlib.in.h $(CXXDEFS_H) $(ARG_NONNULL_H) $(WARN_ON_USE_H)
               -e 's|@''REPLACE_SETENV''@|$(REPLACE_SETENV)|g' \
               -e 's|@''REPLACE_STRTOD''@|$(REPLACE_STRTOD)|g' \
               -e 's|@''REPLACE_UNSETENV''@|$(REPLACE_UNSETENV)|g' \
+              -e 's|@''REPLACE_WCTOMB''@|$(REPLACE_WCTOMB)|g' \
               -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
               -e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \
               -e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)'; \
@@ -340,6 +371,15 @@ EXTRA_libgnu_a_SOURCES += strftime.c
 
 ## end   gnulib module strftime
 
+## begin gnulib module symlink
+
+
+EXTRA_DIST += symlink.c
+
+EXTRA_libgnu_a_SOURCES += symlink.c
+
+## end   gnulib module symlink
+
 ## begin gnulib module sys_stat
 
 BUILT_SOURCES += sys/stat.h
diff --git a/lib/lstat.c b/lib/lstat.c
new file mode 100644
index 00000000000..b26065ede28
--- /dev/null
+++ b/lib/lstat.c
@@ -0,0 +1,91 @@
+/* Work around a bug of lstat on some systems
+
+   Copyright (C) 1997-2006, 2008-2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* written by Jim Meyering */
+
+#include <config.h>
+
+#if !HAVE_LSTAT
+/* On systems that lack symlinks, our replacement <sys/stat.h> already
+   defined lstat as stat, so there is nothing further to do other than
+   avoid an empty file.  */
+typedef int dummy;
+#else /* HAVE_LSTAT */
+
+/* Get the original definition of lstat.  It might be defined as a macro.  */
+# define __need_system_sys_stat_h
+# include <sys/types.h>
+# include <sys/stat.h>
+# undef __need_system_sys_stat_h
+
+static inline int
+orig_lstat (const char *filename, struct stat *buf)
+{
+  return lstat (filename, buf);
+}
+
+/* Specification.  */
+# include <sys/stat.h>
+
+# include <string.h>
+# include <errno.h>
+
+/* lstat works differently on Linux and Solaris systems.  POSIX (see
+   `pathname resolution' in the glossary) requires that programs like
+   `ls' take into consideration the fact that FILE has a trailing slash
+   when FILE is a symbolic link.  On Linux and Solaris 10 systems, the
+   lstat function already has the desired semantics (in treating
+   `lstat ("symlink/", sbuf)' just like `lstat ("symlink/.", sbuf)',
+   but on Solaris 9 and earlier it does not.
+
+   If FILE has a trailing slash and specifies a symbolic link,
+   then use stat() to get more info on the referent of FILE.
+   If the referent is a non-directory, then set errno to ENOTDIR
+   and return -1.  Otherwise, return stat's result.  */
+
+int
+rpl_lstat (const char *file, struct stat *sbuf)
+{
+  size_t len;
+  int lstat_result = orig_lstat (file, sbuf);
+
+  if (lstat_result != 0)
+    return lstat_result;
+
+  /* This replacement file can blindly check against '/' rather than
+     using the ISSLASH macro, because all platforms with '\\' either
+     lack symlinks (mingw) or have working lstat (cygwin) and thus do
+     not compile this file.  0 len should have already been filtered
+     out above, with a failure return of ENOENT.  */
+  len = strlen (file);
+  if (file[len - 1] != '/' || S_ISDIR (sbuf->st_mode))
+    return 0;
+
+  /* At this point, a trailing slash is only permitted on
+     symlink-to-dir; but it should have found information on the
+     directory, not the symlink.  Call stat() to get info about the
+     link's referent.  Our replacement stat guarantees valid results,
+     even if the symlink is not pointing to a directory.  */
+  if (!S_ISLNK (sbuf->st_mode))
+    {
+      errno = ENOTDIR;
+      return -1;
+    }
+  return stat (file, sbuf);
+}
+
+#endif /* HAVE_LSTAT */
diff --git a/lib/readlink.c b/lib/readlink.c
new file mode 100644
index 00000000000..35d045b9a12
--- /dev/null
+++ b/lib/readlink.c
@@ -0,0 +1,74 @@
+/* Stub for readlink().
+   Copyright (C) 2003-2007, 2009-2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <unistd.h>
+
+#include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#if !HAVE_READLINK
+
+/* readlink() substitute for systems that don't have a readlink() function,
+   such as DJGPP 2.03 and mingw32.  */
+
+ssize_t
+readlink (const char *name, char *buf _GL_UNUSED,
+          size_t bufsize _GL_UNUSED)
+{
+  struct stat statbuf;
+
+  /* In general we should use lstat() here, not stat().  But on platforms
+     without symbolic links, lstat() - if it exists - would be equivalent to
+     stat(), therefore we can use stat().  This saves us a configure check.  */
+  if (stat (name, &statbuf) >= 0)
+    errno = EINVAL;
+  return -1;
+}
+
+#else /* HAVE_READLINK */
+
+# undef readlink
+
+/* readlink() wrapper that uses correct types, for systems like cygwin
+   1.5.x where readlink returns int, and which rejects trailing slash,
+   for Solaris 9.  */
+
+ssize_t
+rpl_readlink (const char *name, char *buf, size_t bufsize)
+{
+# if READLINK_TRAILING_SLASH_BUG
+  size_t len = strlen (name);
+  if (len && name[len - 1] == '/')
+    {
+      /* Even if name without the slash is a symlink to a directory,
+         both lstat() and stat() must resolve the trailing slash to
+         the directory rather than the symlink.  We can therefore
+         safely use stat() to distinguish between EINVAL and
+         ENOTDIR/ENOENT, avoiding extra overhead of rpl_lstat().  */
+      struct stat st;
+      if (stat (name, &st) == 0)
+        errno = EINVAL;
+      return -1;
+    }
+# endif /* READLINK_TRAILING_SLASH_BUG */
+  return readlink (name, buf, bufsize);
+}
+
+#endif /* HAVE_READLINK */
diff --git a/lib/stat.c b/lib/stat.c
new file mode 100644
index 00000000000..f16d9144afc
--- /dev/null
+++ b/lib/stat.c
@@ -0,0 +1,104 @@
+/* Work around platform bugs in stat.
+   Copyright (C) 2009-2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* written by Eric Blake */
+
+#include <config.h>
+
+/* Get the original definition of stat.  It might be defined as a macro.  */
+#define __need_system_sys_stat_h
+#include <sys/types.h>
+#include <sys/stat.h>
+#undef __need_system_sys_stat_h
+
+static inline int
+orig_stat (const char *filename, struct stat *buf)
+{
+  return stat (filename, buf);
+}
+
+/* Specification.  */
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <string.h>
+
+/* Store information about NAME into ST.  Work around bugs with
+   trailing slashes.  Mingw has other bugs (such as st_ino always
+   being 0 on success) which this wrapper does not work around.  But
+   at least this implementation provides the ability to emulate fchdir
+   correctly.  */
+
+int
+rpl_stat (char const *name, struct stat *st)
+{
+  int result = orig_stat (name, st);
+#if REPLACE_FUNC_STAT_FILE
+  /* Solaris 9 mistakenly succeeds when given a non-directory with a
+     trailing slash.  */
+  if (result == 0 && !S_ISDIR (st->st_mode))
+    {
+      size_t len = strlen (name);
+      if (ISSLASH (name[len - 1]))
+        {
+          errno = ENOTDIR;
+          return -1;
+        }
+    }
+#endif /* REPLACE_FUNC_STAT_FILE */
+#if REPLACE_FUNC_STAT_DIR
+  if (result == -1 && errno == ENOENT)
+    {
+      /* Due to mingw's oddities, there are some directories (like
+         c:\) where stat() only succeeds with a trailing slash, and
+         other directories (like c:\windows) where stat() only
+         succeeds without a trailing slash.  But we want the two to be
+         synonymous, since chdir() manages either style.  Likewise, Mingw also
+         reports ENOENT for names longer than PATH_MAX, when we want
+         ENAMETOOLONG, and for stat("file/"), when we want ENOTDIR.
+         Fortunately, mingw PATH_MAX is small enough for stack
+         allocation.  */
+      char fixed_name[PATH_MAX + 1] = {0};
+      size_t len = strlen (name);
+      bool check_dir = false;
+      if (PATH_MAX <= len)
+        errno = ENAMETOOLONG;
+      else if (len)
+        {
+          strcpy (fixed_name, name);
+          if (ISSLASH (fixed_name[len - 1]))
+            {
+              check_dir = true;
+              while (len && ISSLASH (fixed_name[len - 1]))
+                fixed_name[--len] = '\0';
+              if (!len)
+                fixed_name[0] = '/';
+            }
+          else
+            fixed_name[len++] = '/';
+          result = orig_stat (fixed_name, st);
+          if (result == 0 && check_dir && !S_ISDIR (st->st_mode))
+            {
+              result = -1;
+              errno = ENOTDIR;
+            }
+        }
+    }
+#endif /* REPLACE_FUNC_STAT_DIR */
+  return result;
+}
diff --git a/lib/stdlib.in.h b/lib/stdlib.in.h
index 62d18c62811..2697a4bd1db 100644
--- a/lib/stdlib.in.h
+++ b/lib/stdlib.in.h
@@ -274,6 +274,21 @@ _GL_WARN_ON_USE (malloc, "malloc is not POSIX compliant everywhere - "
                  "use gnulib module malloc-posix for portability");
 #endif
 
+/* Convert a multibyte character to a wide character.  */
+#if @GNULIB_MBTOWC@
+# if @REPLACE_MBTOWC@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef mbtowc
+#   define mbtowc rpl_mbtowc
+#  endif
+_GL_FUNCDECL_RPL (mbtowc, int, (wchar_t *pwc, const char *s, size_t n));
+_GL_CXXALIAS_RPL (mbtowc, int, (wchar_t *pwc, const char *s, size_t n));
+# else
+_GL_CXXALIAS_SYS (mbtowc, int, (wchar_t *pwc, const char *s, size_t n));
+# endif
+_GL_CXXALIASWARN (mbtowc);
+#endif
+
 #if @GNULIB_MKDTEMP@
 /* Create a unique temporary directory from TEMPLATE.
    The last six characters of TEMPLATE must be "XXXXXX";
@@ -723,6 +738,21 @@ _GL_WARN_ON_USE (unsetenv, "unsetenv is unportable - "
 # endif
 #endif
 
+/* Convert a wide character to a multibyte character.  */
+#if @GNULIB_WCTOMB@
+# if @REPLACE_WCTOMB@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef wctomb
+#   define wctomb rpl_wctomb
+#  endif
+_GL_FUNCDECL_RPL (wctomb, int, (char *s, wchar_t wc));
+_GL_CXXALIAS_RPL (wctomb, int, (char *s, wchar_t wc));
+# else
+_GL_CXXALIAS_SYS (wctomb, int, (char *s, wchar_t wc));
+# endif
+_GL_CXXALIASWARN (wctomb);
+#endif
+
 
 #endif /* _GL_STDLIB_H */
 #endif /* _GL_STDLIB_H */
diff --git a/lib/symlink.c b/lib/symlink.c
new file mode 100644
index 00000000000..2896cc9655b
--- /dev/null
+++ b/lib/symlink.c
@@ -0,0 +1,57 @@
+/* Stub for symlink().
+   Copyright (C) 2009-2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <unistd.h>
+
+#include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
+
+
+#if HAVE_SYMLINK
+
+# undef symlink
+
+/* Create a symlink, but reject trailing slash.  */
+int
+rpl_symlink (char const *contents, char const *name)
+{
+  size_t len = strlen (name);
+  if (len && name[len - 1] == '/')
+    {
+      struct stat st;
+      if (lstat (name, &st) == 0)
+        errno = EEXIST;
+      return -1;
+    }
+  return symlink (contents, name);
+}
+
+#else /* !HAVE_SYMLINK */
+
+/* The system does not support symlinks.  */
+int
+symlink (char const *contents _GL_UNUSED,
+         char const *name _GL_UNUSED)
+{
+  errno = ENOSYS;
+  return -1;
+}
+
+#endif /* !HAVE_SYMLINK */