* [gentoo-commits] proj/sandbox:master commit in: libsbutil/, libsbutil/gnulib/, /
@ 2015-09-20 8:15 Mike Frysinger
0 siblings, 0 replies; only message in thread
From: Mike Frysinger @ 2015-09-20 8:15 UTC (permalink / raw
To: gentoo-commits
commit: 105b7e047e98e8f9211a30133d0cc1cb97aef9b0
Author: Mike Frysinger <vapier <AT> gentoo <DOT> org>
AuthorDate: Sun Sep 20 07:03:30 2015 +0000
Commit: Mike Frysinger <vapier <AT> gentoo <DOT> org>
CommitDate: Sun Sep 20 07:03:30 2015 +0000
URL: https://gitweb.gentoo.org/proj/sandbox.git/commit/?id=105b7e04
libsbutil: gnulib: import modules for canonicalize_filename_mode
This lays the groundwork for fixing handling of broken symlinks. The
gnulib code is hand imported because using the gnulib tool imports a
ton of code we do not want. Only the bare minimum is imported so we
can use the canonicalize_filename_mode function.
This function is needed to canonicalize symlinks that are ultimately
broken. The current sandbox/C library code only supports two modes:
(1) dereference a single symlink
(2) dereference *all* symlinks, but only if all links are valid
For sandbox, we need to know the final path a symlink points to even
if that path doesn't (yet) exist.
Note: This commit doesn't actually fix the bug, just brings in the
functions we need to do so.
URL: https://bugs.gentoo.org/540828
Reported-by: Rick Farina <zerochaos <AT> gentoo.org>
Signed-off-by: Mike Frysinger <vapier <AT> gentoo.org>
configure.ac | 5 +-
| 2 +
libsbutil/Makefile.am | 24 +
libsbutil/gnulib/areadlink-with-size.c | 104 +++
libsbutil/gnulib/areadlink.h | 33 +
libsbutil/gnulib/bitrotate.c | 3 +
libsbutil/gnulib/bitrotate.h | 136 ++++
libsbutil/gnulib/canonicalize.c | 354 +++++++++
libsbutil/gnulib/canonicalize.h | 48 ++
libsbutil/gnulib/careadlinkat.h | 67 ++
libsbutil/gnulib/dosname.h | 53 ++
libsbutil/gnulib/file-set.c | 74 ++
libsbutil/gnulib/file-set.h | 15 +
libsbutil/gnulib/gl-inline.h | 92 +++
libsbutil/gnulib/glue.h | 10 +
libsbutil/gnulib/hash-pjw.c | 40 ++
libsbutil/gnulib/hash-pjw.h | 23 +
libsbutil/gnulib/hash-triple.c | 77 ++
libsbutil/gnulib/hash-triple.h | 24 +
libsbutil/gnulib/hash.c | 1225 ++++++++++++++++++++++++++++++++
libsbutil/gnulib/hash.h | 103 +++
libsbutil/gnulib/pathmax.h | 83 +++
libsbutil/gnulib/same-inode.h | 33 +
libsbutil/gnulib/same.h | 25 +
libsbutil/gnulib/xalloc-oversized.h | 38 +
libsbutil/gnulib/xalloc.h | 1 +
libsbutil/gnulib/xgetcwd.h | 21 +
libsbutil/sbutil.h | 3 +
28 files changed, 2715 insertions(+), 1 deletion(-)
diff --git a/configure.ac b/configure.ac
index 73227db..e705d41 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
AC_PREREQ([2.61])
AC_INIT([sandbox], [2.8], [sandbox@gentoo.org])
-AM_INIT_AUTOMAKE([1.12 dist-xz no-dist-gzip silent-rules -Wall])
+AM_INIT_AUTOMAKE([1.12 dist-xz no-dist-gzip silent-rules subdir-objects -Wall])
AM_SILENT_RULES([yes]) # AM_INIT_AUTOMAKE([silent-rules]) is broken atm
AC_CONFIG_HEADER([config.h])
AC_CONFIG_MACRO_DIR([m4])
@@ -417,6 +417,9 @@ if test "x${LDFLAG_VER}" = "x" ; then
fi
AC_SUBST([LDFLAG_VER])
+dnl Add some glue for gnulib modules that include config.h directly.
+AH_BOTTOM([#include "headers.h"])
+
AC_CONFIG_TESTDIR([tests])
AC_CONFIG_FILES([src/sandbox.sh], [chmod +x src/sandbox.sh])
--git a/headers.h b/headers.h
index 42b7c25..1dc140e 100644
--- a/headers.h
+++ b/headers.h
@@ -146,4 +146,6 @@
# include "localdecls.h"
#endif
+#include "libsbutil/gnulib/glue.h"
+
#endif
diff --git a/libsbutil/Makefile.am b/libsbutil/Makefile.am
index 39a5ab6..0c41500 100644
--- a/libsbutil/Makefile.am
+++ b/libsbutil/Makefile.am
@@ -42,6 +42,30 @@ libsbutil_la_SOURCES = \
src/config.c \
include/rcscripts/util/dynbuf.h \
src/dynbuf.c \
+ gnulib/areadlink.h \
+ gnulib/areadlink-with-size.c \
+ gnulib/bitrotate.c \
+ gnulib/bitrotate.h \
+ gnulib/canonicalize.c \
+ gnulib/canonicalize.h \
+ gnulib/careadlinkat.h \
+ gnulib/dosname.h \
+ gnulib/file-set.c \
+ gnulib/file-set.h \
+ gnulib/gl-inline.h \
+ gnulib/glue.h \
+ gnulib/hash.c \
+ gnulib/hash.h \
+ gnulib/hash-pjw.c \
+ gnulib/hash-pjw.h \
+ gnulib/hash-triple.c \
+ gnulib/hash-triple.h \
+ gnulib/pathmax.h \
+ gnulib/same.h \
+ gnulib/same-inode.h \
+ gnulib/xalloc.h \
+ gnulib/xalloc-oversized.h \
+ gnulib/xgetcwd.h \
$(LOCAL_INCLUDES)
EXTRA_DIST = headers.h
diff --git a/libsbutil/gnulib/areadlink-with-size.c b/libsbutil/gnulib/areadlink-with-size.c
new file mode 100644
index 0000000..e3a8c50
--- /dev/null
+++ b/libsbutil/gnulib/areadlink-with-size.c
@@ -0,0 +1,104 @@
+/* readlink wrapper to return the link name in malloc'd storage.
+ Unlike xreadlink and xreadlink_with_size, don't ever call exit.
+
+ Copyright (C) 2001, 2003-2007, 2009-2015 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 <jim@meyering.net> */
+
+#include <config.h>
+
+#include "areadlink.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#ifndef SSIZE_MAX
+# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
+#endif
+
+/* SYMLINK_MAX is used only for an initial memory-allocation sanity
+ check, so it's OK to guess too small on hosts where there is no
+ arbitrary limit to symbolic link length. */
+#ifndef SYMLINK_MAX
+# define SYMLINK_MAX 1024
+#endif
+
+#define MAXSIZE (SIZE_MAX < SSIZE_MAX ? SIZE_MAX : SSIZE_MAX)
+
+/* Call readlink to get the symbolic link value of FILE.
+ SIZE is a hint as to how long the link is expected to be;
+ typically it is taken from st_size. It need not be correct.
+ Return a pointer to that NUL-terminated string in malloc'd storage.
+ If readlink fails, malloc fails, or if the link value is longer
+ than SSIZE_MAX, return NULL (caller may use errno to diagnose). */
+
+char *
+areadlink_with_size (char const *file, size_t size)
+{
+ /* Some buggy file systems report garbage in st_size. Defend
+ against them by ignoring outlandish st_size values in the initial
+ memory allocation. */
+ size_t symlink_max = SYMLINK_MAX;
+ size_t INITIAL_LIMIT_BOUND = 8 * 1024;
+ size_t initial_limit = (symlink_max < INITIAL_LIMIT_BOUND
+ ? symlink_max + 1
+ : INITIAL_LIMIT_BOUND);
+
+ /* The initial buffer size for the link value. */
+ size_t buf_size = size < initial_limit ? size + 1 : initial_limit;
+
+ while (1)
+ {
+ ssize_t r;
+ size_t link_length;
+ char *buffer = malloc (buf_size);
+
+ if (buffer == NULL)
+ return NULL;
+ r = readlink (file, buffer, buf_size);
+ link_length = r;
+
+ /* On AIX 5L v5.3 and HP-UX 11i v2 04/09, readlink returns -1
+ with errno == ERANGE if the buffer is too small. */
+ if (r < 0 && errno != ERANGE)
+ {
+ int saved_errno = errno;
+ free (buffer);
+ errno = saved_errno;
+ return NULL;
+ }
+
+ if (link_length < buf_size)
+ {
+ buffer[link_length] = 0;
+ return buffer;
+ }
+
+ free (buffer);
+ if (buf_size <= MAXSIZE / 2)
+ buf_size *= 2;
+ else if (buf_size < MAXSIZE)
+ buf_size = MAXSIZE;
+ else
+ {
+ errno = ENOMEM;
+ return NULL;
+ }
+ }
+}
diff --git a/libsbutil/gnulib/areadlink.h b/libsbutil/gnulib/areadlink.h
new file mode 100644
index 0000000..d9e0fa1
--- /dev/null
+++ b/libsbutil/gnulib/areadlink.h
@@ -0,0 +1,33 @@
+/* Read symbolic links without size limitation.
+
+ Copyright (C) 2001, 2003-2004, 2007, 2009-2015 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 <jim@meyering.net> */
+
+#include <stddef.h>
+
+extern char *areadlink (char const *filename);
+extern char *areadlink_with_size (char const *filename, size_t size_hint);
+
+#if GNULIB_AREADLINKAT
+extern char *areadlinkat (int fd, char const *filename);
+#endif
+
+#if GNULIB_AREADLINKAT_WITH_SIZE
+extern char *areadlinkat_with_size (int fd, char const *filename,
+ size_t size_hint);
+#endif
diff --git a/libsbutil/gnulib/bitrotate.c b/libsbutil/gnulib/bitrotate.c
new file mode 100644
index 0000000..a8f6028
--- /dev/null
+++ b/libsbutil/gnulib/bitrotate.c
@@ -0,0 +1,3 @@
+#include <config.h>
+#define BITROTATE_INLINE _GL_EXTERN_INLINE
+#include "bitrotate.h"
diff --git a/libsbutil/gnulib/bitrotate.h b/libsbutil/gnulib/bitrotate.h
new file mode 100644
index 0000000..1665e99
--- /dev/null
+++ b/libsbutil/gnulib/bitrotate.h
@@ -0,0 +1,136 @@
+/* bitrotate.h - Rotate bits in integers
+ Copyright (C) 2008-2015 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 Simon Josefsson <simon@josefsson.org>, 2008. */
+
+#ifndef _GL_BITROTATE_H
+#define _GL_BITROTATE_H
+
+#include <limits.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
+_GL_INLINE_HEADER_BEGIN
+#ifndef BITROTATE_INLINE
+# define BITROTATE_INLINE _GL_INLINE
+#endif
+
+#ifdef UINT64_MAX
+/* Given an unsigned 64-bit argument X, return the value corresponding
+ to rotating the bits N steps to the left. N must be between 1 and
+ 63 inclusive. */
+BITROTATE_INLINE uint64_t
+rotl64 (uint64_t x, int n)
+{
+ return ((x << n) | (x >> (64 - n))) & UINT64_MAX;
+}
+
+/* Given an unsigned 64-bit argument X, return the value corresponding
+ to rotating the bits N steps to the right. N must be between 1 to
+ 63 inclusive.*/
+BITROTATE_INLINE uint64_t
+rotr64 (uint64_t x, int n)
+{
+ return ((x >> n) | (x << (64 - n))) & UINT64_MAX;
+}
+#endif
+
+/* Given an unsigned 32-bit argument X, return the value corresponding
+ to rotating the bits N steps to the left. N must be between 1 and
+ 31 inclusive. */
+BITROTATE_INLINE uint32_t
+rotl32 (uint32_t x, int n)
+{
+ return ((x << n) | (x >> (32 - n))) & UINT32_MAX;
+}
+
+/* Given an unsigned 32-bit argument X, return the value corresponding
+ to rotating the bits N steps to the right. N must be between 1 to
+ 31 inclusive.*/
+BITROTATE_INLINE uint32_t
+rotr32 (uint32_t x, int n)
+{
+ return ((x >> n) | (x << (32 - n))) & UINT32_MAX;
+}
+
+/* Given a size_t argument X, return the value corresponding
+ to rotating the bits N steps to the left. N must be between 1 and
+ (CHAR_BIT * sizeof (size_t) - 1) inclusive. */
+BITROTATE_INLINE size_t
+rotl_sz (size_t x, int n)
+{
+ return ((x << n) | (x >> ((CHAR_BIT * sizeof x) - n))) & SIZE_MAX;
+}
+
+/* Given a size_t argument X, return the value corresponding
+ to rotating the bits N steps to the right. N must be between 1 to
+ (CHAR_BIT * sizeof (size_t) - 1) inclusive. */
+BITROTATE_INLINE size_t
+rotr_sz (size_t x, int n)
+{
+ return ((x >> n) | (x << ((CHAR_BIT * sizeof x) - n))) & SIZE_MAX;
+}
+
+/* Given an unsigned 16-bit argument X, return the value corresponding
+ to rotating the bits N steps to the left. N must be between 1 to
+ 15 inclusive, but on most relevant targets N can also be 0 and 16
+ because 'int' is at least 32 bits and the arguments must widen
+ before shifting. */
+BITROTATE_INLINE uint16_t
+rotl16 (uint16_t x, int n)
+{
+ return ((x << n) | (x >> (16 - n))) & UINT16_MAX;
+}
+
+/* Given an unsigned 16-bit argument X, return the value corresponding
+ to rotating the bits N steps to the right. N must be in 1 to 15
+ inclusive, but on most relevant targets N can also be 0 and 16
+ because 'int' is at least 32 bits and the arguments must widen
+ before shifting. */
+BITROTATE_INLINE uint16_t
+rotr16 (uint16_t x, int n)
+{
+ return ((x >> n) | (x << (16 - n))) & UINT16_MAX;
+}
+
+/* Given an unsigned 8-bit argument X, return the value corresponding
+ to rotating the bits N steps to the left. N must be between 1 to 7
+ inclusive, but on most relevant targets N can also be 0 and 8
+ because 'int' is at least 32 bits and the arguments must widen
+ before shifting. */
+BITROTATE_INLINE uint8_t
+rotl8 (uint8_t x, int n)
+{
+ return ((x << n) | (x >> (8 - n))) & UINT8_MAX;
+}
+
+/* Given an unsigned 8-bit argument X, return the value corresponding
+ to rotating the bits N steps to the right. N must be in 1 to 7
+ inclusive, but on most relevant targets N can also be 0 and 8
+ because 'int' is at least 32 bits and the arguments must widen
+ before shifting. */
+BITROTATE_INLINE uint8_t
+rotr8 (uint8_t x, int n)
+{
+ return ((x >> n) | (x << (8 - n))) & UINT8_MAX;
+}
+
+_GL_INLINE_HEADER_END
+
+#endif /* _GL_BITROTATE_H */
diff --git a/libsbutil/gnulib/canonicalize.c b/libsbutil/gnulib/canonicalize.c
new file mode 100644
index 0000000..397ac76
--- /dev/null
+++ b/libsbutil/gnulib/canonicalize.c
@@ -0,0 +1,354 @@
+/* Return the canonical absolute name of a given file.
+ Copyright (C) 1996-2015 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>
+
+#include "canonicalize.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "areadlink.h"
+#include "file-set.h"
+#include "hash-triple.h"
+#include "pathmax.h"
+#include "xalloc.h"
+#include "xgetcwd.h"
+#include "dosname.h"
+
+#define MULTIPLE_BITS_SET(i) (((i) & ((i) - 1)) != 0)
+
+/* In this file, we cannot handle file names longer than PATH_MAX.
+ On systems with no file name length limit, use a fallback. */
+#ifndef PATH_MAX
+# define PATH_MAX 8192
+#endif
+
+#ifndef DOUBLE_SLASH_IS_DISTINCT_ROOT
+# define DOUBLE_SLASH_IS_DISTINCT_ROOT 0
+#endif
+
+#if ISSLASH ('\\')
+# define SLASHES "/\\"
+#else
+# define SLASHES "/"
+#endif
+
+#if !((HAVE_CANONICALIZE_FILE_NAME && FUNC_REALPATH_WORKS) \
+ || GNULIB_CANONICALIZE_LGPL)
+/* Return the canonical absolute name of file NAME. A canonical name
+ does not contain any ".", ".." components nor any repeated file name
+ separators ('/') or symlinks. All components must exist.
+ The result is malloc'd. */
+
+char *
+canonicalize_file_name (const char *name)
+{
+ return canonicalize_filename_mode (name, CAN_EXISTING);
+}
+#endif /* !HAVE_CANONICALIZE_FILE_NAME */
+
+/* Return true if we've already seen the triple, <FILENAME, dev, ino>.
+ If *HT is not initialized, initialize it. */
+static bool
+seen_triple (Hash_table **ht, char const *filename, struct stat const *st)
+{
+ if (*ht == NULL)
+ {
+ size_t initial_capacity = 7;
+ *ht = hash_initialize (initial_capacity,
+ NULL,
+ triple_hash,
+ triple_compare_ino_str,
+ triple_free);
+ if (*ht == NULL)
+ xalloc_die ();
+ }
+
+ if (seen_file (*ht, filename, st))
+ return true;
+
+ record_file (*ht, filename, st);
+ return false;
+}
+
+/* Return the canonical absolute name of file NAME, while treating
+ missing elements according to CAN_MODE. A canonical name
+ does not contain any ".", ".." components nor any repeated file name
+ separators ('/') or, depending on other CAN_MODE flags, symlinks.
+ Whether components must exist or not depends on canonicalize mode.
+ The result is malloc'd. */
+
+char *
+canonicalize_filename_mode (const char *name, canonicalize_mode_t can_mode)
+{
+ char *rname, *dest, *extra_buf = NULL;
+ char const *start;
+ char const *end;
+ char const *rname_limit;
+ size_t extra_len = 0;
+ Hash_table *ht = NULL;
+ int saved_errno;
+ int can_flags = can_mode & ~CAN_MODE_MASK;
+ bool logical = can_flags & CAN_NOLINKS;
+ size_t prefix_len;
+
+ can_mode &= CAN_MODE_MASK;
+
+ if (MULTIPLE_BITS_SET (can_mode))
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ if (name == NULL)
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ if (name[0] == '\0')
+ {
+ errno = ENOENT;
+ return NULL;
+ }
+
+ /* This is always zero for Posix hosts, but can be 2 for MS-Windows
+ and MS-DOS X:/foo/bar file names. */
+ prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
+
+ if (!IS_ABSOLUTE_FILE_NAME (name))
+ {
+ rname = xgetcwd ();
+ if (!rname)
+ return NULL;
+ dest = strchr (rname, '\0');
+ if (dest - rname < PATH_MAX)
+ {
+ char *p = xrealloc (rname, PATH_MAX);
+ dest = p + (dest - rname);
+ rname = p;
+ rname_limit = rname + PATH_MAX;
+ }
+ else
+ {
+ rname_limit = dest;
+ }
+ start = name;
+ prefix_len = FILE_SYSTEM_PREFIX_LEN (rname);
+ }
+ else
+ {
+ rname = xmalloc (PATH_MAX);
+ rname_limit = rname + PATH_MAX;
+ dest = rname;
+ if (prefix_len)
+ {
+ memcpy (rname, name, prefix_len);
+ dest += prefix_len;
+ }
+ *dest++ = '/';
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT)
+ {
+ if (ISSLASH (name[1]) && !ISSLASH (name[2]) && !prefix_len)
+ *dest++ = '/';
+ *dest = '\0';
+ }
+ start = name + prefix_len;
+ }
+
+ for ( ; *start; start = end)
+ {
+ /* Skip sequence of multiple file name separators. */
+ while (ISSLASH (*start))
+ ++start;
+
+ /* Find end of component. */
+ for (end = start; *end && !ISSLASH (*end); ++end)
+ /* Nothing. */;
+
+ if (end - start == 0)
+ break;
+ else if (end - start == 1 && start[0] == '.')
+ /* nothing */;
+ else if (end - start == 2 && start[0] == '.' && start[1] == '.')
+ {
+ /* Back up to previous component, ignore if at root already. */
+ if (dest > rname + prefix_len + 1)
+ for (--dest; dest > rname && !ISSLASH (dest[-1]); --dest)
+ continue;
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rname + 1
+ && !prefix_len && ISSLASH (*dest) && !ISSLASH (dest[1]))
+ dest++;
+ }
+ else
+ {
+ struct stat st;
+
+ if (!ISSLASH (dest[-1]))
+ *dest++ = '/';
+
+ if (dest + (end - start) >= rname_limit)
+ {
+ ptrdiff_t dest_offset = dest - rname;
+ size_t new_size = rname_limit - rname;
+
+ if (end - start + 1 > PATH_MAX)
+ new_size += end - start + 1;
+ else
+ new_size += PATH_MAX;
+ rname = xrealloc (rname, new_size);
+ rname_limit = rname + new_size;
+
+ dest = rname + dest_offset;
+ }
+
+ dest = memcpy (dest, start, end - start);
+ dest += end - start;
+ *dest = '\0';
+
+ if (logical && (can_mode == CAN_MISSING))
+ {
+ /* Avoid the stat in this case as it's inconsequential.
+ i.e. we're neither resolving symlinks or testing
+ component existence. */
+ st.st_mode = 0;
+ }
+ else if ((logical ? stat (rname, &st) : lstat (rname, &st)) != 0)
+ {
+ saved_errno = errno;
+ if (can_mode == CAN_EXISTING)
+ goto error;
+ if (can_mode == CAN_ALL_BUT_LAST)
+ {
+ if (end[strspn (end, SLASHES)] || saved_errno != ENOENT)
+ goto error;
+ continue;
+ }
+ st.st_mode = 0;
+ }
+
+ if (S_ISLNK (st.st_mode))
+ {
+ char *buf;
+ size_t n, len;
+
+ /* Detect loops. We cannot use the cycle-check module here,
+ since it's actually possible to encounter the same symlink
+ more than once in a given traversal. However, encountering
+ the same symlink,NAME pair twice does indicate a loop. */
+ if (seen_triple (&ht, name, &st))
+ {
+ if (can_mode == CAN_MISSING)
+ continue;
+ saved_errno = ELOOP;
+ goto error;
+ }
+
+ buf = areadlink_with_size (rname, st.st_size);
+ if (!buf)
+ {
+ if (can_mode == CAN_MISSING && errno != ENOMEM)
+ continue;
+ saved_errno = errno;
+ goto error;
+ }
+
+ n = strlen (buf);
+ len = strlen (end);
+
+ if (!extra_len)
+ {
+ extra_len =
+ ((n + len + 1) > PATH_MAX) ? (n + len + 1) : PATH_MAX;
+ extra_buf = xmalloc (extra_len);
+ }
+ else if ((n + len + 1) > extra_len)
+ {
+ extra_len = n + len + 1;
+ extra_buf = xrealloc (extra_buf, extra_len);
+ }
+
+ /* Careful here, end may be a pointer into extra_buf... */
+ memmove (&extra_buf[n], end, len + 1);
+ name = end = memcpy (extra_buf, buf, n);
+
+ if (IS_ABSOLUTE_FILE_NAME (buf))
+ {
+ size_t pfxlen = FILE_SYSTEM_PREFIX_LEN (buf);
+
+ if (pfxlen)
+ memcpy (rname, buf, pfxlen);
+ dest = rname + pfxlen;
+ *dest++ = '/'; /* It's an absolute symlink */
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT)
+ {
+ if (ISSLASH (buf[1]) && !ISSLASH (buf[2]) && !pfxlen)
+ *dest++ = '/';
+ *dest = '\0';
+ }
+ /* Install the new prefix to be in effect hereafter. */
+ prefix_len = pfxlen;
+ }
+ else
+ {
+ /* Back up to previous component, ignore if at root
+ already: */
+ if (dest > rname + prefix_len + 1)
+ for (--dest; dest > rname && !ISSLASH (dest[-1]); --dest)
+ continue;
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rname + 1
+ && ISSLASH (*dest) && !ISSLASH (dest[1]) && !prefix_len)
+ dest++;
+ }
+
+ free (buf);
+ }
+ else
+ {
+ if (!S_ISDIR (st.st_mode) && *end && (can_mode != CAN_MISSING))
+ {
+ saved_errno = ENOTDIR;
+ goto error;
+ }
+ }
+ }
+ }
+ if (dest > rname + prefix_len + 1 && ISSLASH (dest[-1]))
+ --dest;
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rname + 1 && !prefix_len
+ && ISSLASH (*dest) && !ISSLASH (dest[1]))
+ dest++;
+ *dest = '\0';
+ if (rname_limit != dest + 1)
+ rname = xrealloc (rname, dest - rname + 1);
+
+ free (extra_buf);
+ if (ht)
+ hash_free (ht);
+ return rname;
+
+error:
+ free (extra_buf);
+ free (rname);
+ if (ht)
+ hash_free (ht);
+ errno = saved_errno;
+ return NULL;
+}
diff --git a/libsbutil/gnulib/canonicalize.h b/libsbutil/gnulib/canonicalize.h
new file mode 100644
index 0000000..236cba5
--- /dev/null
+++ b/libsbutil/gnulib/canonicalize.h
@@ -0,0 +1,48 @@
+/* Return the canonical absolute name of a given file.
+ Copyright (C) 1996-2007, 2009-2015 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/>. */
+
+#ifndef CANONICALIZE_H_
+# define CANONICALIZE_H_
+
+#include <stdlib.h> /* for canonicalize_file_name */
+
+#define CAN_MODE_MASK (CAN_EXISTING | CAN_ALL_BUT_LAST | CAN_MISSING)
+
+enum canonicalize_mode_t
+ {
+ /* All components must exist. */
+ CAN_EXISTING = 0,
+
+ /* All components excluding last one must exist. */
+ CAN_ALL_BUT_LAST = 1,
+
+ /* No requirements on components existence. */
+ CAN_MISSING = 2,
+
+ /* Don't expand symlinks. */
+ CAN_NOLINKS = 4
+ };
+typedef enum canonicalize_mode_t canonicalize_mode_t;
+
+/* Return the canonical absolute name of file NAME, while treating
+ missing elements according to CAN_MODE. A canonical name
+ does not contain any `.', `..' components nor any repeated file name
+ separators ('/') or, depending on other CAN_MODE flags, symlinks.
+ Whether components must exist or not depends on canonicalize mode.
+ The result is malloc'd. */
+char *canonicalize_filename_mode (const char *, canonicalize_mode_t);
+
+#endif /* !CANONICALIZE_H_ */
diff --git a/libsbutil/gnulib/careadlinkat.h b/libsbutil/gnulib/careadlinkat.h
new file mode 100644
index 0000000..4eb9fcc
--- /dev/null
+++ b/libsbutil/gnulib/careadlinkat.h
@@ -0,0 +1,67 @@
+/* Read symbolic links into a buffer without size limitation, relative to fd.
+
+ Copyright (C) 2011-2015 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 Paul Eggert, Bruno Haible, and Jim Meyering. */
+
+#ifndef _GL_CAREADLINKAT_H
+#define _GL_CAREADLINKAT_H
+
+#include <fcntl.h>
+#include <unistd.h>
+
+struct allocator;
+
+/* Assuming the current directory is FD, get the symbolic link value
+ of FILENAME as a null-terminated string and put it into a buffer.
+ If FD is AT_FDCWD, FILENAME is interpreted relative to the current
+ working directory, as in openat.
+
+ If the link is small enough to fit into BUFFER put it there.
+ BUFFER's size is BUFFER_SIZE, and BUFFER can be null
+ if BUFFER_SIZE is zero.
+
+ If the link is not small, put it into a dynamically allocated
+ buffer managed by ALLOC. It is the caller's responsibility to free
+ the returned value if it is nonnull and is not BUFFER.
+
+ The PREADLINKAT function specifies how to read links. It operates
+ like POSIX readlinkat()
+ <http://pubs.opengroup.org/onlinepubs/9699919799/functions/readlink.html>
+ but can assume that its first argument is the same as FD.
+
+ If successful, return the buffer address; otherwise return NULL and
+ set errno. */
+
+char *careadlinkat (int fd, char const *filename,
+ char *buffer, size_t buffer_size,
+ struct allocator const *alloc,
+ ssize_t (*preadlinkat) (int, char const *,
+ char *, size_t));
+
+/* Suitable value for careadlinkat's FD argument. */
+#if HAVE_READLINKAT
+/* AT_FDCWD is declared in <fcntl.h>. */
+#else
+/* Define AT_FDCWD independently, so that the careadlinkat module does
+ not depend on the fcntl-h module. We might as well use the same value
+ as fcntl-h. */
+# ifndef AT_FDCWD
+# define AT_FDCWD (-3041965)
+# endif
+#endif
+
+#endif /* _GL_CAREADLINKAT_H */
diff --git a/libsbutil/gnulib/dosname.h b/libsbutil/gnulib/dosname.h
new file mode 100644
index 0000000..893baf6
--- /dev/null
+++ b/libsbutil/gnulib/dosname.h
@@ -0,0 +1,53 @@
+/* File names on MS-DOS/Windows systems.
+
+ Copyright (C) 2000-2001, 2004-2006, 2009-2015 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/>.
+
+ From Paul Eggert and Jim Meyering. */
+
+#ifndef _DOSNAME_H
+#define _DOSNAME_H
+
+#if (defined _WIN32 || defined __WIN32__ || \
+ defined __MSDOS__ || defined __CYGWIN__ || \
+ defined __EMX__ || defined __DJGPP__)
+ /* This internal macro assumes ASCII, but all hosts that support drive
+ letters use ASCII. */
+# define _IS_DRIVE_LETTER(C) (((unsigned int) (C) | ('a' - 'A')) - 'a' \
+ <= 'z' - 'a')
+# define FILE_SYSTEM_PREFIX_LEN(Filename) \
+ (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':' ? 2 : 0)
+# ifndef __CYGWIN__
+# define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 1
+# endif
+# define ISSLASH(C) ((C) == '/' || (C) == '\\')
+#else
+# define FILE_SYSTEM_PREFIX_LEN(Filename) 0
+# define ISSLASH(C) ((C) == '/')
+#endif
+
+#ifndef FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
+# define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0
+#endif
+
+#if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
+# define IS_ABSOLUTE_FILE_NAME(F) ISSLASH ((F)[FILE_SYSTEM_PREFIX_LEN (F)])
+# else
+# define IS_ABSOLUTE_FILE_NAME(F) \
+ (ISSLASH ((F)[0]) || FILE_SYSTEM_PREFIX_LEN (F) != 0)
+#endif
+#define IS_RELATIVE_FILE_NAME(F) (! IS_ABSOLUTE_FILE_NAME (F))
+
+#endif /* DOSNAME_H_ */
diff --git a/libsbutil/gnulib/file-set.c b/libsbutil/gnulib/file-set.c
new file mode 100644
index 0000000..1cf2f0c
--- /dev/null
+++ b/libsbutil/gnulib/file-set.c
@@ -0,0 +1,74 @@
+/* Specialized functions to manipulate a set of files.
+ Copyright (C) 2007, 2009-2015 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>
+#include "file-set.h"
+
+#include "hash-triple.h"
+#include "xalloc.h"
+
+/* Record file, FILE, and dev/ino from *STATS, in the hash table, HT.
+ If HT is NULL, return immediately.
+ If memory allocation fails, exit immediately. */
+void
+record_file (Hash_table *ht, char const *file, struct stat const *stats)
+{
+ struct F_triple *ent;
+
+ if (ht == NULL)
+ return;
+
+ ent = xmalloc (sizeof *ent);
+ ent->name = xstrdup (file);
+ ent->st_ino = stats->st_ino;
+ ent->st_dev = stats->st_dev;
+
+ {
+ struct F_triple *ent_from_table = hash_insert (ht, ent);
+ if (ent_from_table == NULL)
+ {
+ /* Insertion failed due to lack of memory. */
+ xalloc_die ();
+ }
+
+ if (ent_from_table != ent)
+ {
+ /* There was alread a matching entry in the table, so ENT was
+ not inserted. Free it. */
+ triple_free (ent);
+ }
+ }
+}
+
+/* Return true if there is an entry in hash table, HT,
+ for the file described by FILE and STATS. */
+bool
+seen_file (Hash_table const *ht, char const *file,
+ struct stat const *stats)
+{
+ struct F_triple new_ent;
+
+ if (ht == NULL)
+ return false;
+
+ new_ent.name = (char *) file;
+ new_ent.st_ino = stats->st_ino;
+ new_ent.st_dev = stats->st_dev;
+
+ return !!hash_lookup (ht, &new_ent);
+}
diff --git a/libsbutil/gnulib/file-set.h b/libsbutil/gnulib/file-set.h
new file mode 100644
index 0000000..4e47d95
--- /dev/null
+++ b/libsbutil/gnulib/file-set.h
@@ -0,0 +1,15 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdbool.h>
+
+#include "hash.h"
+
+extern void record_file (Hash_table *ht, char const *file,
+ struct stat const *stats)
+#if defined __GNUC__ && ((__GNUC__ == 3 && __GNUC_MINOR__ >= 3) || __GNUC__ > 3)
+ __attribute__ ((nonnull (2, 3)))
+#endif
+;
+
+extern bool seen_file (Hash_table const *ht, char const *file,
+ struct stat const *stats);
diff --git a/libsbutil/gnulib/gl-inline.h b/libsbutil/gnulib/gl-inline.h
new file mode 100644
index 0000000..bb8598e
--- /dev/null
+++ b/libsbutil/gnulib/gl-inline.h
@@ -0,0 +1,92 @@
+/* Expansion of gl_EXTERN_INLINE */
+
+/* Please see the Gnulib manual for how to use these macros.
+
+ Suppress extern inline with HP-UX cc, as it appears to be broken; see
+ <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>.
+
+ Suppress extern inline with Sun C in standards-conformance mode, as it
+ mishandles inline functions that call each other. E.g., for 'inline void f
+ (void) { } inline void g (void) { f (); }', c99 incorrectly complains
+ 'reference to static identifier "f" in extern inline function'.
+ This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16.
+
+ Suppress extern inline (with or without __attribute__ ((__gnu_inline__)))
+ on configurations that mistakenly use 'static inline' to implement
+ functions or macros in standard C headers like <ctype.h>. For example,
+ if isdigit is mistakenly implemented via a static inline function,
+ a program containing an extern inline function that calls isdigit
+ may not work since the C standard prohibits extern inline functions
+ from calling static functions. This bug is known to occur on:
+
+ OS X 10.8 and earlier; see:
+ http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html
+
+ DragonFly; see
+ http://muscles.dragonflybsd.org/bulk/bleeding-edge-potential/latest-per-pkg/ah-tty-0.3.12.log
+
+ FreeBSD; see:
+ http://lists.gnu.org/archive/html/bug-gnulib/2014-07/msg00104.html
+
+ OS X 10.9 has a macro __header_inline indicating the bug is fixed for C and
+ for clang but remains for g++; see <http://trac.macports.org/ticket/41033>.
+ Assume DragonFly and FreeBSD will be similar. */
+#if (((defined __APPLE__ && defined __MACH__) \
+ || defined __DragonFly__ || defined __FreeBSD__) \
+ && (defined __header_inline \
+ ? (defined __cplusplus && defined __GNUC_STDC_INLINE__ \
+ && ! defined __clang__) \
+ : ((! defined _DONT_USE_CTYPE_INLINE_ \
+ && (defined __GNUC__ || defined __cplusplus)) \
+ || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
+ && defined __GNUC__ && ! defined __cplusplus))))
+# define _GL_EXTERN_INLINE_STDHEADER_BUG
+#endif
+#if ((__GNUC__ \
+ ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
+ : (199901L <= __STDC_VERSION__ \
+ && !defined __HP_cc \
+ && !(defined __SUNPRO_C && __STDC__))) \
+ && !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
+# define _GL_INLINE inline
+# define _GL_EXTERN_INLINE extern inline
+# define _GL_EXTERN_INLINE_IN_USE
+#elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
+ && !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
+# if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__
+ /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */
+# define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
+# else
+# define _GL_INLINE extern inline
+# endif
+# define _GL_EXTERN_INLINE extern
+# define _GL_EXTERN_INLINE_IN_USE
+#else
+# define _GL_INLINE static _GL_UNUSED
+# define _GL_EXTERN_INLINE static _GL_UNUSED
+#endif
+
+/* In GCC 4.6 (inclusive) to 5.1 (exclusive),
+ suppress bogus "no previous prototype for 'FOO'"
+ and "no previous declaration for 'FOO'" diagnostics,
+ when FOO is an inline function in the header; see
+ <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113> and
+ <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63877>. */
+#if __GNUC__ == 4 && 6 <= __GNUC_MINOR__
+# if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
+# define _GL_INLINE_HEADER_CONST_PRAGMA
+# else
+# define _GL_INLINE_HEADER_CONST_PRAGMA \
+ _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
+# endif
+# define _GL_INLINE_HEADER_BEGIN \
+ _Pragma ("GCC diagnostic push") \
+ _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
+ _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \
+ _GL_INLINE_HEADER_CONST_PRAGMA
+# define _GL_INLINE_HEADER_END \
+ _Pragma ("GCC diagnostic pop")
+#else
+# define _GL_INLINE_HEADER_BEGIN
+# define _GL_INLINE_HEADER_END
+#endif
diff --git a/libsbutil/gnulib/glue.h b/libsbutil/gnulib/glue.h
new file mode 100644
index 0000000..083ab73
--- /dev/null
+++ b/libsbutil/gnulib/glue.h
@@ -0,0 +1,10 @@
+/* gnulib-specific glue logic that normally gnulib macros would set up.
+ *
+ * Copyright 1999-2015 Gentoo Foundation
+ * Licensed under the GPL-2
+ */
+
+#define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
+#define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
+
+#include "gl-inline.h"
diff --git a/libsbutil/gnulib/hash-pjw.c b/libsbutil/gnulib/hash-pjw.c
new file mode 100644
index 0000000..b2e0251
--- /dev/null
+++ b/libsbutil/gnulib/hash-pjw.c
@@ -0,0 +1,40 @@
+/* hash-pjw.c -- compute a hash value from a NUL-terminated string.
+
+ Copyright (C) 2001, 2003, 2006, 2009-2015 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>
+
+#include "hash-pjw.h"
+
+#include <limits.h>
+
+#define SIZE_BITS (sizeof (size_t) * CHAR_BIT)
+
+/* A hash function for NUL-terminated char* strings using
+ the method described by Bruno Haible.
+ See http://www.haible.de/bruno/hashfunc.html. */
+
+size_t
+hash_pjw (const void *x, size_t tablesize)
+{
+ const char *s;
+ size_t h = 0;
+
+ for (s = x; *s; s++)
+ h = *s + ((h << 9) | (h >> (SIZE_BITS - 9)));
+
+ return h % tablesize;
+}
diff --git a/libsbutil/gnulib/hash-pjw.h b/libsbutil/gnulib/hash-pjw.h
new file mode 100644
index 0000000..f4b005c
--- /dev/null
+++ b/libsbutil/gnulib/hash-pjw.h
@@ -0,0 +1,23 @@
+/* hash-pjw.h -- declaration for a simple hash function
+ Copyright (C) 2001, 2003, 2009-2015 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 <stddef.h>
+
+/* Compute a hash code for a NUL-terminated string starting at X,
+ and return the hash code modulo TABLESIZE.
+ The result is platform dependent: it depends on the size of the 'size_t'
+ type and on the signedness of the 'char' type. */
+extern size_t hash_pjw (void const *x, size_t tablesize) _GL_ATTRIBUTE_PURE;
diff --git a/libsbutil/gnulib/hash-triple.c b/libsbutil/gnulib/hash-triple.c
new file mode 100644
index 0000000..c3b6d9f
--- /dev/null
+++ b/libsbutil/gnulib/hash-triple.c
@@ -0,0 +1,77 @@
+/* Hash functions for file-related triples: name, device, inode.
+ Copyright (C) 2007, 2009-2015 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>
+
+#include "hash-triple.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "hash-pjw.h"
+#include "same.h"
+#include "same-inode.h"
+
+#define STREQ(a, b) (strcmp (a, b) == 0)
+
+/* Hash an F_triple, and *do* consider the file name. */
+size_t
+triple_hash (void const *x, size_t table_size)
+{
+ struct F_triple const *p = x;
+ size_t tmp = hash_pjw (p->name, table_size);
+
+ /* Ignoring the device number here should be fine. */
+ return (tmp ^ p->st_ino) % table_size;
+}
+
+/* Hash an F_triple, without considering the file name. */
+size_t
+triple_hash_no_name (void const *x, size_t table_size)
+{
+ struct F_triple const *p = x;
+
+ /* Ignoring the device number here should be fine. */
+ return p->st_ino % table_size;
+}
+
+/* Compare two F_triple structs. */
+bool
+triple_compare (void const *x, void const *y)
+{
+ struct F_triple const *a = x;
+ struct F_triple const *b = y;
+ return (SAME_INODE (*a, *b) && same_name (a->name, b->name)) ? true : false;
+}
+
+bool
+triple_compare_ino_str (void const *x, void const *y)
+{
+ struct F_triple const *a = x;
+ struct F_triple const *b = y;
+ return (SAME_INODE (*a, *b) && STREQ (a->name, b->name)) ? true : false;
+}
+
+/* Free an F_triple. */
+void
+triple_free (void *x)
+{
+ struct F_triple *a = x;
+ free (a->name);
+ free (a);
+}
diff --git a/libsbutil/gnulib/hash-triple.h b/libsbutil/gnulib/hash-triple.h
new file mode 100644
index 0000000..0658d81
--- /dev/null
+++ b/libsbutil/gnulib/hash-triple.h
@@ -0,0 +1,24 @@
+#ifndef HASH_TRIPLE_H
+#define HASH_TRIPLE_H
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdbool.h>
+
+/* Describe a just-created or just-renamed destination file. */
+struct F_triple
+{
+ char *name;
+ ino_t st_ino;
+ dev_t st_dev;
+};
+
+extern size_t triple_hash (void const *x, size_t table_size) _GL_ATTRIBUTE_PURE;
+extern size_t triple_hash_no_name (void const *x, size_t table_size)
+ _GL_ATTRIBUTE_PURE;
+extern bool triple_compare (void const *x, void const *y);
+extern bool triple_compare_ino_str (void const *x, void const *y)
+ _GL_ATTRIBUTE_PURE;
+extern void triple_free (void *x);
+
+#endif
diff --git a/libsbutil/gnulib/hash.c b/libsbutil/gnulib/hash.c
new file mode 100644
index 0000000..4f27d5c
--- /dev/null
+++ b/libsbutil/gnulib/hash.c
@@ -0,0 +1,1225 @@
+/* hash - hashing table processing.
+
+ Copyright (C) 1998-2004, 2006-2007, 2009-2015 Free Software Foundation, Inc.
+
+ Written by Jim Meyering, 1992.
+
+ 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/>. */
+
+/* A generic hash table package. */
+
+/* Define USE_OBSTACK to 1 if you want the allocator to use obstacks instead
+ of malloc. If you change USE_OBSTACK, you have to recompile! */
+
+#include <config.h>
+
+#include "hash.h"
+
+#include "bitrotate.h"
+#include "xalloc-oversized.h"
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#if USE_OBSTACK
+# include "obstack.h"
+# ifndef obstack_chunk_alloc
+# define obstack_chunk_alloc malloc
+# endif
+# ifndef obstack_chunk_free
+# define obstack_chunk_free free
+# endif
+#endif
+
+struct hash_entry
+ {
+ void *data;
+ struct hash_entry *next;
+ };
+
+struct hash_table
+ {
+ /* The array of buckets starts at BUCKET and extends to BUCKET_LIMIT-1,
+ for a possibility of N_BUCKETS. Among those, N_BUCKETS_USED buckets
+ are not empty, there are N_ENTRIES active entries in the table. */
+ struct hash_entry *bucket;
+ struct hash_entry const *bucket_limit;
+ size_t n_buckets;
+ size_t n_buckets_used;
+ size_t n_entries;
+
+ /* Tuning arguments, kept in a physically separate structure. */
+ const Hash_tuning *tuning;
+
+ /* Three functions are given to 'hash_initialize', see the documentation
+ block for this function. In a word, HASHER randomizes a user entry
+ into a number up from 0 up to some maximum minus 1; COMPARATOR returns
+ true if two user entries compare equally; and DATA_FREER is the cleanup
+ function for a user entry. */
+ Hash_hasher hasher;
+ Hash_comparator comparator;
+ Hash_data_freer data_freer;
+
+ /* A linked list of freed struct hash_entry structs. */
+ struct hash_entry *free_entry_list;
+
+#if USE_OBSTACK
+ /* Whenever obstacks are used, it is possible to allocate all overflowed
+ entries into a single stack, so they all can be freed in a single
+ operation. It is not clear if the speedup is worth the trouble. */
+ struct obstack entry_stack;
+#endif
+ };
+
+/* A hash table contains many internal entries, each holding a pointer to
+ some user-provided data (also called a user entry). An entry indistinctly
+ refers to both the internal entry and its associated user entry. A user
+ entry contents may be hashed by a randomization function (the hashing
+ function, or just "hasher" for short) into a number (or "slot") between 0
+ and the current table size. At each slot position in the hash table,
+ starts a linked chain of entries for which the user data all hash to this
+ slot. A bucket is the collection of all entries hashing to the same slot.
+
+ A good "hasher" function will distribute entries rather evenly in buckets.
+ In the ideal case, the length of each bucket is roughly the number of
+ entries divided by the table size. Finding the slot for a data is usually
+ done in constant time by the "hasher", and the later finding of a precise
+ entry is linear in time with the size of the bucket. Consequently, a
+ larger hash table size (that is, a larger number of buckets) is prone to
+ yielding shorter chains, *given* the "hasher" function behaves properly.
+
+ Long buckets slow down the lookup algorithm. One might use big hash table
+ sizes in hope to reduce the average length of buckets, but this might
+ become inordinate, as unused slots in the hash table take some space. The
+ best bet is to make sure you are using a good "hasher" function (beware
+ that those are not that easy to write! :-), and to use a table size
+ larger than the actual number of entries. */
+
+/* If an insertion makes the ratio of nonempty buckets to table size larger
+ than the growth threshold (a number between 0.0 and 1.0), then increase
+ the table size by multiplying by the growth factor (a number greater than
+ 1.0). The growth threshold defaults to 0.8, and the growth factor
+ defaults to 1.414, meaning that the table will have doubled its size
+ every second time 80% of the buckets get used. */
+#define DEFAULT_GROWTH_THRESHOLD 0.8f
+#define DEFAULT_GROWTH_FACTOR 1.414f
+
+/* If a deletion empties a bucket and causes the ratio of used buckets to
+ table size to become smaller than the shrink threshold (a number between
+ 0.0 and 1.0), then shrink the table by multiplying by the shrink factor (a
+ number greater than the shrink threshold but smaller than 1.0). The shrink
+ threshold and factor default to 0.0 and 1.0, meaning that the table never
+ shrinks. */
+#define DEFAULT_SHRINK_THRESHOLD 0.0f
+#define DEFAULT_SHRINK_FACTOR 1.0f
+
+/* Use this to initialize or reset a TUNING structure to
+ some sensible values. */
+static const Hash_tuning default_tuning =
+ {
+ DEFAULT_SHRINK_THRESHOLD,
+ DEFAULT_SHRINK_FACTOR,
+ DEFAULT_GROWTH_THRESHOLD,
+ DEFAULT_GROWTH_FACTOR,
+ false
+ };
+
+/* Information and lookup. */
+
+/* The following few functions provide information about the overall hash
+ table organization: the number of entries, number of buckets and maximum
+ length of buckets. */
+
+/* Return the number of buckets in the hash table. The table size, the total
+ number of buckets (used plus unused), or the maximum number of slots, are
+ the same quantity. */
+
+size_t
+hash_get_n_buckets (const Hash_table *table)
+{
+ return table->n_buckets;
+}
+
+/* Return the number of slots in use (non-empty buckets). */
+
+size_t
+hash_get_n_buckets_used (const Hash_table *table)
+{
+ return table->n_buckets_used;
+}
+
+/* Return the number of active entries. */
+
+size_t
+hash_get_n_entries (const Hash_table *table)
+{
+ return table->n_entries;
+}
+
+/* Return the length of the longest chain (bucket). */
+
+size_t
+hash_get_max_bucket_length (const Hash_table *table)
+{
+ struct hash_entry const *bucket;
+ size_t max_bucket_length = 0;
+
+ for (bucket = table->bucket; bucket < table->bucket_limit; bucket++)
+ {
+ if (bucket->data)
+ {
+ struct hash_entry const *cursor = bucket;
+ size_t bucket_length = 1;
+
+ while (cursor = cursor->next, cursor)
+ bucket_length++;
+
+ if (bucket_length > max_bucket_length)
+ max_bucket_length = bucket_length;
+ }
+ }
+
+ return max_bucket_length;
+}
+
+/* Do a mild validation of a hash table, by traversing it and checking two
+ statistics. */
+
+bool
+hash_table_ok (const Hash_table *table)
+{
+ struct hash_entry const *bucket;
+ size_t n_buckets_used = 0;
+ size_t n_entries = 0;
+
+ for (bucket = table->bucket; bucket < table->bucket_limit; bucket++)
+ {
+ if (bucket->data)
+ {
+ struct hash_entry const *cursor = bucket;
+
+ /* Count bucket head. */
+ n_buckets_used++;
+ n_entries++;
+
+ /* Count bucket overflow. */
+ while (cursor = cursor->next, cursor)
+ n_entries++;
+ }
+ }
+
+ if (n_buckets_used == table->n_buckets_used && n_entries == table->n_entries)
+ return true;
+
+ return false;
+}
+
+void
+hash_print_statistics (const Hash_table *table, FILE *stream)
+{
+ size_t n_entries = hash_get_n_entries (table);
+ size_t n_buckets = hash_get_n_buckets (table);
+ size_t n_buckets_used = hash_get_n_buckets_used (table);
+ size_t max_bucket_length = hash_get_max_bucket_length (table);
+
+ fprintf (stream, "# entries: %lu\n", (unsigned long int) n_entries);
+ fprintf (stream, "# buckets: %lu\n", (unsigned long int) n_buckets);
+ fprintf (stream, "# buckets used: %lu (%.2f%%)\n",
+ (unsigned long int) n_buckets_used,
+ (100.0 * n_buckets_used) / n_buckets);
+ fprintf (stream, "max bucket length: %lu\n",
+ (unsigned long int) max_bucket_length);
+}
+
+/* Hash KEY and return a pointer to the selected bucket.
+ If TABLE->hasher misbehaves, abort. */
+static struct hash_entry *
+safe_hasher (const Hash_table *table, const void *key)
+{
+ size_t n = table->hasher (key, table->n_buckets);
+ if (! (n < table->n_buckets))
+ abort ();
+ return table->bucket + n;
+}
+
+/* If ENTRY matches an entry already in the hash table, return the
+ entry from the table. Otherwise, return NULL. */
+
+void *
+hash_lookup (const Hash_table *table, const void *entry)
+{
+ struct hash_entry const *bucket = safe_hasher (table, entry);
+ struct hash_entry const *cursor;
+
+ if (bucket->data == NULL)
+ return NULL;
+
+ for (cursor = bucket; cursor; cursor = cursor->next)
+ if (entry == cursor->data || table->comparator (entry, cursor->data))
+ return cursor->data;
+
+ return NULL;
+}
+
+/* Walking. */
+
+/* The functions in this page traverse the hash table and process the
+ contained entries. For the traversal to work properly, the hash table
+ should not be resized nor modified while any particular entry is being
+ processed. In particular, entries should not be added, and an entry
+ may be removed only if there is no shrink threshold and the entry being
+ removed has already been passed to hash_get_next. */
+
+/* Return the first data in the table, or NULL if the table is empty. */
+
+void *
+hash_get_first (const Hash_table *table)
+{
+ struct hash_entry const *bucket;
+
+ if (table->n_entries == 0)
+ return NULL;
+
+ for (bucket = table->bucket; ; bucket++)
+ if (! (bucket < table->bucket_limit))
+ abort ();
+ else if (bucket->data)
+ return bucket->data;
+}
+
+/* Return the user data for the entry following ENTRY, where ENTRY has been
+ returned by a previous call to either 'hash_get_first' or 'hash_get_next'.
+ Return NULL if there are no more entries. */
+
+void *
+hash_get_next (const Hash_table *table, const void *entry)
+{
+ struct hash_entry const *bucket = safe_hasher (table, entry);
+ struct hash_entry const *cursor;
+
+ /* Find next entry in the same bucket. */
+ cursor = bucket;
+ do
+ {
+ if (cursor->data == entry && cursor->next)
+ return cursor->next->data;
+ cursor = cursor->next;
+ }
+ while (cursor != NULL);
+
+ /* Find first entry in any subsequent bucket. */
+ while (++bucket < table->bucket_limit)
+ if (bucket->data)
+ return bucket->data;
+
+ /* None found. */
+ return NULL;
+}
+
+/* Fill BUFFER with pointers to active user entries in the hash table, then
+ return the number of pointers copied. Do not copy more than BUFFER_SIZE
+ pointers. */
+
+size_t
+hash_get_entries (const Hash_table *table, void **buffer,
+ size_t buffer_size)
+{
+ size_t counter = 0;
+ struct hash_entry const *bucket;
+ struct hash_entry const *cursor;
+
+ for (bucket = table->bucket; bucket < table->bucket_limit; bucket++)
+ {
+ if (bucket->data)
+ {
+ for (cursor = bucket; cursor; cursor = cursor->next)
+ {
+ if (counter >= buffer_size)
+ return counter;
+ buffer[counter++] = cursor->data;
+ }
+ }
+ }
+
+ return counter;
+}
+
+/* Call a PROCESSOR function for each entry of a hash table, and return the
+ number of entries for which the processor function returned success. A
+ pointer to some PROCESSOR_DATA which will be made available to each call to
+ the processor function. The PROCESSOR accepts two arguments: the first is
+ the user entry being walked into, the second is the value of PROCESSOR_DATA
+ as received. The walking continue for as long as the PROCESSOR function
+ returns nonzero. When it returns zero, the walking is interrupted. */
+
+size_t
+hash_do_for_each (const Hash_table *table, Hash_processor processor,
+ void *processor_data)
+{
+ size_t counter = 0;
+ struct hash_entry const *bucket;
+ struct hash_entry const *cursor;
+
+ for (bucket = table->bucket; bucket < table->bucket_limit; bucket++)
+ {
+ if (bucket->data)
+ {
+ for (cursor = bucket; cursor; cursor = cursor->next)
+ {
+ if (! processor (cursor->data, processor_data))
+ return counter;
+ counter++;
+ }
+ }
+ }
+
+ return counter;
+}
+
+/* Allocation and clean-up. */
+
+/* Return a hash index for a NUL-terminated STRING between 0 and N_BUCKETS-1.
+ This is a convenience routine for constructing other hashing functions. */
+
+#if USE_DIFF_HASH
+
+/* About hashings, Paul Eggert writes to me (FP), on 1994-01-01: "Please see
+ B. J. McKenzie, R. Harries & T. Bell, Selecting a hashing algorithm,
+ Software--practice & experience 20, 2 (Feb 1990), 209-224. Good hash
+ algorithms tend to be domain-specific, so what's good for [diffutils'] io.c
+ may not be good for your application." */
+
+size_t
+hash_string (const char *string, size_t n_buckets)
+{
+# define HASH_ONE_CHAR(Value, Byte) \
+ ((Byte) + rotl_sz (Value, 7))
+
+ size_t value = 0;
+ unsigned char ch;
+
+ for (; (ch = *string); string++)
+ value = HASH_ONE_CHAR (value, ch);
+ return value % n_buckets;
+
+# undef HASH_ONE_CHAR
+}
+
+#else /* not USE_DIFF_HASH */
+
+/* This one comes from 'recode', and performs a bit better than the above as
+ per a few experiments. It is inspired from a hashing routine found in the
+ very old Cyber 'snoop', itself written in typical Greg Mansfield style.
+ (By the way, what happened to this excellent man? Is he still alive?) */
+
+size_t
+hash_string (const char *string, size_t n_buckets)
+{
+ size_t value = 0;
+ unsigned char ch;
+
+ for (; (ch = *string); string++)
+ value = (value * 31 + ch) % n_buckets;
+ return value;
+}
+
+#endif /* not USE_DIFF_HASH */
+
+/* Return true if CANDIDATE is a prime number. CANDIDATE should be an odd
+ number at least equal to 11. */
+
+static bool _GL_ATTRIBUTE_CONST
+is_prime (size_t candidate)
+{
+ size_t divisor = 3;
+ size_t square = divisor * divisor;
+
+ while (square < candidate && (candidate % divisor))
+ {
+ divisor++;
+ square += 4 * divisor;
+ divisor++;
+ }
+
+ return (candidate % divisor ? true : false);
+}
+
+/* Round a given CANDIDATE number up to the nearest prime, and return that
+ prime. Primes lower than 10 are merely skipped. */
+
+static size_t _GL_ATTRIBUTE_CONST
+next_prime (size_t candidate)
+{
+ /* Skip small primes. */
+ if (candidate < 10)
+ candidate = 10;
+
+ /* Make it definitely odd. */
+ candidate |= 1;
+
+ while (SIZE_MAX != candidate && !is_prime (candidate))
+ candidate += 2;
+
+ return candidate;
+}
+
+void
+hash_reset_tuning (Hash_tuning *tuning)
+{
+ *tuning = default_tuning;
+}
+
+/* If the user passes a NULL hasher, we hash the raw pointer. */
+static size_t
+raw_hasher (const void *data, size_t n)
+{
+ /* When hashing unique pointers, it is often the case that they were
+ generated by malloc and thus have the property that the low-order
+ bits are 0. As this tends to give poorer performance with small
+ tables, we rotate the pointer value before performing division,
+ in an attempt to improve hash quality. */
+ size_t val = rotr_sz ((size_t) data, 3);
+ return val % n;
+}
+
+/* If the user passes a NULL comparator, we use pointer comparison. */
+static bool
+raw_comparator (const void *a, const void *b)
+{
+ return a == b;
+}
+
+
+/* For the given hash TABLE, check the user supplied tuning structure for
+ reasonable values, and return true if there is no gross error with it.
+ Otherwise, definitively reset the TUNING field to some acceptable default
+ in the hash table (that is, the user loses the right of further modifying
+ tuning arguments), and return false. */
+
+static bool
+check_tuning (Hash_table *table)
+{
+ const Hash_tuning *tuning = table->tuning;
+ float epsilon;
+ if (tuning == &default_tuning)
+ return true;
+
+ /* Be a bit stricter than mathematics would require, so that
+ rounding errors in size calculations do not cause allocations to
+ fail to grow or shrink as they should. The smallest allocation
+ is 11 (due to next_prime's algorithm), so an epsilon of 0.1
+ should be good enough. */
+ epsilon = 0.1f;
+
+ if (epsilon < tuning->growth_threshold
+ && tuning->growth_threshold < 1 - epsilon
+ && 1 + epsilon < tuning->growth_factor
+ && 0 <= tuning->shrink_threshold
+ && tuning->shrink_threshold + epsilon < tuning->shrink_factor
+ && tuning->shrink_factor <= 1
+ && tuning->shrink_threshold + epsilon < tuning->growth_threshold)
+ return true;
+
+ table->tuning = &default_tuning;
+ return false;
+}
+
+/* Compute the size of the bucket array for the given CANDIDATE and
+ TUNING, or return 0 if there is no possible way to allocate that
+ many entries. */
+
+static size_t _GL_ATTRIBUTE_PURE
+compute_bucket_size (size_t candidate, const Hash_tuning *tuning)
+{
+ if (!tuning->is_n_buckets)
+ {
+ float new_candidate = candidate / tuning->growth_threshold;
+ if (SIZE_MAX <= new_candidate)
+ return 0;
+ candidate = new_candidate;
+ }
+ candidate = next_prime (candidate);
+ if (xalloc_oversized (candidate, sizeof (struct hash_entry *)))
+ return 0;
+ return candidate;
+}
+
+/* Allocate and return a new hash table, or NULL upon failure. The initial
+ number of buckets is automatically selected so as to _guarantee_ that you
+ may insert at least CANDIDATE different user entries before any growth of
+ the hash table size occurs. So, if have a reasonably tight a-priori upper
+ bound on the number of entries you intend to insert in the hash table, you
+ may save some table memory and insertion time, by specifying it here. If
+ the IS_N_BUCKETS field of the TUNING structure is true, the CANDIDATE
+ argument has its meaning changed to the wanted number of buckets.
+
+ TUNING points to a structure of user-supplied values, in case some fine
+ tuning is wanted over the default behavior of the hasher. If TUNING is
+ NULL, the default tuning parameters are used instead. If TUNING is
+ provided but the values requested are out of bounds or might cause
+ rounding errors, return NULL.
+
+ The user-supplied HASHER function, when not NULL, accepts two
+ arguments ENTRY and TABLE_SIZE. It computes, by hashing ENTRY contents, a
+ slot number for that entry which should be in the range 0..TABLE_SIZE-1.
+ This slot number is then returned.
+
+ The user-supplied COMPARATOR function, when not NULL, accepts two
+ arguments pointing to user data, it then returns true for a pair of entries
+ that compare equal, or false otherwise. This function is internally called
+ on entries which are already known to hash to the same bucket index,
+ but which are distinct pointers.
+
+ The user-supplied DATA_FREER function, when not NULL, may be later called
+ with the user data as an argument, just before the entry containing the
+ data gets freed. This happens from within 'hash_free' or 'hash_clear'.
+ You should specify this function only if you want these functions to free
+ all of your 'data' data. This is typically the case when your data is
+ simply an auxiliary struct that you have malloc'd to aggregate several
+ values. */
+
+Hash_table *
+hash_initialize (size_t candidate, const Hash_tuning *tuning,
+ Hash_hasher hasher, Hash_comparator comparator,
+ Hash_data_freer data_freer)
+{
+ Hash_table *table;
+
+ if (hasher == NULL)
+ hasher = raw_hasher;
+ if (comparator == NULL)
+ comparator = raw_comparator;
+
+ table = malloc (sizeof *table);
+ if (table == NULL)
+ return NULL;
+
+ if (!tuning)
+ tuning = &default_tuning;
+ table->tuning = tuning;
+ if (!check_tuning (table))
+ {
+ /* Fail if the tuning options are invalid. This is the only occasion
+ when the user gets some feedback about it. Once the table is created,
+ if the user provides invalid tuning options, we silently revert to
+ using the defaults, and ignore further request to change the tuning
+ options. */
+ goto fail;
+ }
+
+ table->n_buckets = compute_bucket_size (candidate, tuning);
+ if (!table->n_buckets)
+ goto fail;
+
+ table->bucket = calloc (table->n_buckets, sizeof *table->bucket);
+ if (table->bucket == NULL)
+ goto fail;
+ table->bucket_limit = table->bucket + table->n_buckets;
+ table->n_buckets_used = 0;
+ table->n_entries = 0;
+
+ table->hasher = hasher;
+ table->comparator = comparator;
+ table->data_freer = data_freer;
+
+ table->free_entry_list = NULL;
+#if USE_OBSTACK
+ obstack_init (&table->entry_stack);
+#endif
+ return table;
+
+ fail:
+ free (table);
+ return NULL;
+}
+
+/* Make all buckets empty, placing any chained entries on the free list.
+ Apply the user-specified function data_freer (if any) to the datas of any
+ affected entries. */
+
+void
+hash_clear (Hash_table *table)
+{
+ struct hash_entry *bucket;
+
+ for (bucket = table->bucket; bucket < table->bucket_limit; bucket++)
+ {
+ if (bucket->data)
+ {
+ struct hash_entry *cursor;
+ struct hash_entry *next;
+
+ /* Free the bucket overflow. */
+ for (cursor = bucket->next; cursor; cursor = next)
+ {
+ if (table->data_freer)
+ table->data_freer (cursor->data);
+ cursor->data = NULL;
+
+ next = cursor->next;
+ /* Relinking is done one entry at a time, as it is to be expected
+ that overflows are either rare or short. */
+ cursor->next = table->free_entry_list;
+ table->free_entry_list = cursor;
+ }
+
+ /* Free the bucket head. */
+ if (table->data_freer)
+ table->data_freer (bucket->data);
+ bucket->data = NULL;
+ bucket->next = NULL;
+ }
+ }
+
+ table->n_buckets_used = 0;
+ table->n_entries = 0;
+}
+
+/* Reclaim all storage associated with a hash table. If a data_freer
+ function has been supplied by the user when the hash table was created,
+ this function applies it to the data of each entry before freeing that
+ entry. */
+
+void
+hash_free (Hash_table *table)
+{
+ struct hash_entry *bucket;
+ struct hash_entry *cursor;
+ struct hash_entry *next;
+
+ /* Call the user data_freer function. */
+ if (table->data_freer && table->n_entries)
+ {
+ for (bucket = table->bucket; bucket < table->bucket_limit; bucket++)
+ {
+ if (bucket->data)
+ {
+ for (cursor = bucket; cursor; cursor = cursor->next)
+ table->data_freer (cursor->data);
+ }
+ }
+ }
+
+#if USE_OBSTACK
+
+ obstack_free (&table->entry_stack, NULL);
+
+#else
+
+ /* Free all bucket overflowed entries. */
+ for (bucket = table->bucket; bucket < table->bucket_limit; bucket++)
+ {
+ for (cursor = bucket->next; cursor; cursor = next)
+ {
+ next = cursor->next;
+ free (cursor);
+ }
+ }
+
+ /* Also reclaim the internal list of previously freed entries. */
+ for (cursor = table->free_entry_list; cursor; cursor = next)
+ {
+ next = cursor->next;
+ free (cursor);
+ }
+
+#endif
+
+ /* Free the remainder of the hash table structure. */
+ free (table->bucket);
+ free (table);
+}
+
+/* Insertion and deletion. */
+
+/* Get a new hash entry for a bucket overflow, possibly by recycling a
+ previously freed one. If this is not possible, allocate a new one. */
+
+static struct hash_entry *
+allocate_entry (Hash_table *table)
+{
+ struct hash_entry *new;
+
+ if (table->free_entry_list)
+ {
+ new = table->free_entry_list;
+ table->free_entry_list = new->next;
+ }
+ else
+ {
+#if USE_OBSTACK
+ new = obstack_alloc (&table->entry_stack, sizeof *new);
+#else
+ new = malloc (sizeof *new);
+#endif
+ }
+
+ return new;
+}
+
+/* Free a hash entry which was part of some bucket overflow,
+ saving it for later recycling. */
+
+static void
+free_entry (Hash_table *table, struct hash_entry *entry)
+{
+ entry->data = NULL;
+ entry->next = table->free_entry_list;
+ table->free_entry_list = entry;
+}
+
+/* This private function is used to help with insertion and deletion. When
+ ENTRY matches an entry in the table, return a pointer to the corresponding
+ user data and set *BUCKET_HEAD to the head of the selected bucket.
+ Otherwise, return NULL. When DELETE is true and ENTRY matches an entry in
+ the table, unlink the matching entry. */
+
+static void *
+hash_find_entry (Hash_table *table, const void *entry,
+ struct hash_entry **bucket_head, bool delete)
+{
+ struct hash_entry *bucket = safe_hasher (table, entry);
+ struct hash_entry *cursor;
+
+ *bucket_head = bucket;
+
+ /* Test for empty bucket. */
+ if (bucket->data == NULL)
+ return NULL;
+
+ /* See if the entry is the first in the bucket. */
+ if (entry == bucket->data || table->comparator (entry, bucket->data))
+ {
+ void *data = bucket->data;
+
+ if (delete)
+ {
+ if (bucket->next)
+ {
+ struct hash_entry *next = bucket->next;
+
+ /* Bump the first overflow entry into the bucket head, then save
+ the previous first overflow entry for later recycling. */
+ *bucket = *next;
+ free_entry (table, next);
+ }
+ else
+ {
+ bucket->data = NULL;
+ }
+ }
+
+ return data;
+ }
+
+ /* Scan the bucket overflow. */
+ for (cursor = bucket; cursor->next; cursor = cursor->next)
+ {
+ if (entry == cursor->next->data
+ || table->comparator (entry, cursor->next->data))
+ {
+ void *data = cursor->next->data;
+
+ if (delete)
+ {
+ struct hash_entry *next = cursor->next;
+
+ /* Unlink the entry to delete, then save the freed entry for later
+ recycling. */
+ cursor->next = next->next;
+ free_entry (table, next);
+ }
+
+ return data;
+ }
+ }
+
+ /* No entry found. */
+ return NULL;
+}
+
+/* Internal helper, to move entries from SRC to DST. Both tables must
+ share the same free entry list. If SAFE, only move overflow
+ entries, saving bucket heads for later, so that no allocations will
+ occur. Return false if the free entry list is exhausted and an
+ allocation fails. */
+
+static bool
+transfer_entries (Hash_table *dst, Hash_table *src, bool safe)
+{
+ struct hash_entry *bucket;
+ struct hash_entry *cursor;
+ struct hash_entry *next;
+ for (bucket = src->bucket; bucket < src->bucket_limit; bucket++)
+ if (bucket->data)
+ {
+ void *data;
+ struct hash_entry *new_bucket;
+
+ /* Within each bucket, transfer overflow entries first and
+ then the bucket head, to minimize memory pressure. After
+ all, the only time we might allocate is when moving the
+ bucket head, but moving overflow entries first may create
+ free entries that can be recycled by the time we finally
+ get to the bucket head. */
+ for (cursor = bucket->next; cursor; cursor = next)
+ {
+ data = cursor->data;
+ new_bucket = safe_hasher (dst, data);
+
+ next = cursor->next;
+
+ if (new_bucket->data)
+ {
+ /* Merely relink an existing entry, when moving from a
+ bucket overflow into a bucket overflow. */
+ cursor->next = new_bucket->next;
+ new_bucket->next = cursor;
+ }
+ else
+ {
+ /* Free an existing entry, when moving from a bucket
+ overflow into a bucket header. */
+ new_bucket->data = data;
+ dst->n_buckets_used++;
+ free_entry (dst, cursor);
+ }
+ }
+ /* Now move the bucket head. Be sure that if we fail due to
+ allocation failure that the src table is in a consistent
+ state. */
+ data = bucket->data;
+ bucket->next = NULL;
+ if (safe)
+ continue;
+ new_bucket = safe_hasher (dst, data);
+
+ if (new_bucket->data)
+ {
+ /* Allocate or recycle an entry, when moving from a bucket
+ header into a bucket overflow. */
+ struct hash_entry *new_entry = allocate_entry (dst);
+
+ if (new_entry == NULL)
+ return false;
+
+ new_entry->data = data;
+ new_entry->next = new_bucket->next;
+ new_bucket->next = new_entry;
+ }
+ else
+ {
+ /* Move from one bucket header to another. */
+ new_bucket->data = data;
+ dst->n_buckets_used++;
+ }
+ bucket->data = NULL;
+ src->n_buckets_used--;
+ }
+ return true;
+}
+
+/* For an already existing hash table, change the number of buckets through
+ specifying CANDIDATE. The contents of the hash table are preserved. The
+ new number of buckets is automatically selected so as to _guarantee_ that
+ the table may receive at least CANDIDATE different user entries, including
+ those already in the table, before any other growth of the hash table size
+ occurs. If TUNING->IS_N_BUCKETS is true, then CANDIDATE specifies the
+ exact number of buckets desired. Return true iff the rehash succeeded. */
+
+bool
+hash_rehash (Hash_table *table, size_t candidate)
+{
+ Hash_table storage;
+ Hash_table *new_table;
+ size_t new_size = compute_bucket_size (candidate, table->tuning);
+
+ if (!new_size)
+ return false;
+ if (new_size == table->n_buckets)
+ return true;
+ new_table = &storage;
+ new_table->bucket = calloc (new_size, sizeof *new_table->bucket);
+ if (new_table->bucket == NULL)
+ return false;
+ new_table->n_buckets = new_size;
+ new_table->bucket_limit = new_table->bucket + new_size;
+ new_table->n_buckets_used = 0;
+ new_table->n_entries = 0;
+ new_table->tuning = table->tuning;
+ new_table->hasher = table->hasher;
+ new_table->comparator = table->comparator;
+ new_table->data_freer = table->data_freer;
+
+ /* In order for the transfer to successfully complete, we need
+ additional overflow entries when distinct buckets in the old
+ table collide into a common bucket in the new table. The worst
+ case possible is a hasher that gives a good spread with the old
+ size, but returns a constant with the new size; if we were to
+ guarantee table->n_buckets_used-1 free entries in advance, then
+ the transfer would be guaranteed to not allocate memory.
+ However, for large tables, a guarantee of no further allocation
+ introduces a lot of extra memory pressure, all for an unlikely
+ corner case (most rehashes reduce, rather than increase, the
+ number of overflow entries needed). So, we instead ensure that
+ the transfer process can be reversed if we hit a memory
+ allocation failure mid-transfer. */
+
+ /* Merely reuse the extra old space into the new table. */
+#if USE_OBSTACK
+ new_table->entry_stack = table->entry_stack;
+#endif
+ new_table->free_entry_list = table->free_entry_list;
+
+ if (transfer_entries (new_table, table, false))
+ {
+ /* Entries transferred successfully; tie up the loose ends. */
+ free (table->bucket);
+ table->bucket = new_table->bucket;
+ table->bucket_limit = new_table->bucket_limit;
+ table->n_buckets = new_table->n_buckets;
+ table->n_buckets_used = new_table->n_buckets_used;
+ table->free_entry_list = new_table->free_entry_list;
+ /* table->n_entries and table->entry_stack already hold their value. */
+ return true;
+ }
+
+ /* We've allocated new_table->bucket (and possibly some entries),
+ exhausted the free list, and moved some but not all entries into
+ new_table. We must undo the partial move before returning
+ failure. The only way to get into this situation is if new_table
+ uses fewer buckets than the old table, so we will reclaim some
+ free entries as overflows in the new table are put back into
+ distinct buckets in the old table.
+
+ There are some pathological cases where a single pass through the
+ table requires more intermediate overflow entries than using two
+ passes. Two passes give worse cache performance and takes
+ longer, but at this point, we're already out of memory, so slow
+ and safe is better than failure. */
+ table->free_entry_list = new_table->free_entry_list;
+ if (! (transfer_entries (table, new_table, true)
+ && transfer_entries (table, new_table, false)))
+ abort ();
+ /* table->n_entries already holds its value. */
+ free (new_table->bucket);
+ return false;
+}
+
+/* Insert ENTRY into hash TABLE if there is not already a matching entry.
+
+ Return -1 upon memory allocation failure.
+ Return 1 if insertion succeeded.
+ Return 0 if there is already a matching entry in the table,
+ and in that case, if MATCHED_ENT is non-NULL, set *MATCHED_ENT
+ to that entry.
+
+ This interface is easier to use than hash_insert when you must
+ distinguish between the latter two cases. More importantly,
+ hash_insert is unusable for some types of ENTRY values. When using
+ hash_insert, the only way to distinguish those cases is to compare
+ the return value and ENTRY. That works only when you can have two
+ different ENTRY values that point to data that compares "equal". Thus,
+ when the ENTRY value is a simple scalar, you must use
+ hash_insert_if_absent. ENTRY must not be NULL. */
+int
+hash_insert_if_absent (Hash_table *table, void const *entry,
+ void const **matched_ent)
+{
+ void *data;
+ struct hash_entry *bucket;
+
+ /* The caller cannot insert a NULL entry, since hash_lookup returns NULL
+ to indicate "not found", and hash_find_entry uses "bucket->data == NULL"
+ to indicate an empty bucket. */
+ if (! entry)
+ abort ();
+
+ /* If there's a matching entry already in the table, return that. */
+ if ((data = hash_find_entry (table, entry, &bucket, false)) != NULL)
+ {
+ if (matched_ent)
+ *matched_ent = data;
+ return 0;
+ }
+
+ /* If the growth threshold of the buckets in use has been reached, increase
+ the table size and rehash. There's no point in checking the number of
+ entries: if the hashing function is ill-conditioned, rehashing is not
+ likely to improve it. */
+
+ if (table->n_buckets_used
+ > table->tuning->growth_threshold * table->n_buckets)
+ {
+ /* Check more fully, before starting real work. If tuning arguments
+ became invalid, the second check will rely on proper defaults. */
+ check_tuning (table);
+ if (table->n_buckets_used
+ > table->tuning->growth_threshold * table->n_buckets)
+ {
+ const Hash_tuning *tuning = table->tuning;
+ float candidate =
+ (tuning->is_n_buckets
+ ? (table->n_buckets * tuning->growth_factor)
+ : (table->n_buckets * tuning->growth_factor
+ * tuning->growth_threshold));
+
+ if (SIZE_MAX <= candidate)
+ return -1;
+
+ /* If the rehash fails, arrange to return NULL. */
+ if (!hash_rehash (table, candidate))
+ return -1;
+
+ /* Update the bucket we are interested in. */
+ if (hash_find_entry (table, entry, &bucket, false) != NULL)
+ abort ();
+ }
+ }
+
+ /* ENTRY is not matched, it should be inserted. */
+
+ if (bucket->data)
+ {
+ struct hash_entry *new_entry = allocate_entry (table);
+
+ if (new_entry == NULL)
+ return -1;
+
+ /* Add ENTRY in the overflow of the bucket. */
+
+ new_entry->data = (void *) entry;
+ new_entry->next = bucket->next;
+ bucket->next = new_entry;
+ table->n_entries++;
+ return 1;
+ }
+
+ /* Add ENTRY right in the bucket head. */
+
+ bucket->data = (void *) entry;
+ table->n_entries++;
+ table->n_buckets_used++;
+
+ return 1;
+}
+
+/* If ENTRY matches an entry already in the hash table, return the pointer
+ to the entry from the table. Otherwise, insert ENTRY and return ENTRY.
+ Return NULL if the storage required for insertion cannot be allocated.
+ This implementation does not support duplicate entries or insertion of
+ NULL. */
+
+void *
+hash_insert (Hash_table *table, void const *entry)
+{
+ void const *matched_ent;
+ int err = hash_insert_if_absent (table, entry, &matched_ent);
+ return (err == -1
+ ? NULL
+ : (void *) (err == 0 ? matched_ent : entry));
+}
+
+/* If ENTRY is already in the table, remove it and return the just-deleted
+ data (the user may want to deallocate its storage). If ENTRY is not in the
+ table, don't modify the table and return NULL. */
+
+void *
+hash_delete (Hash_table *table, const void *entry)
+{
+ void *data;
+ struct hash_entry *bucket;
+
+ data = hash_find_entry (table, entry, &bucket, true);
+ if (!data)
+ return NULL;
+
+ table->n_entries--;
+ if (!bucket->data)
+ {
+ table->n_buckets_used--;
+
+ /* If the shrink threshold of the buckets in use has been reached,
+ rehash into a smaller table. */
+
+ if (table->n_buckets_used
+ < table->tuning->shrink_threshold * table->n_buckets)
+ {
+ /* Check more fully, before starting real work. If tuning arguments
+ became invalid, the second check will rely on proper defaults. */
+ check_tuning (table);
+ if (table->n_buckets_used
+ < table->tuning->shrink_threshold * table->n_buckets)
+ {
+ const Hash_tuning *tuning = table->tuning;
+ size_t candidate =
+ (tuning->is_n_buckets
+ ? table->n_buckets * tuning->shrink_factor
+ : (table->n_buckets * tuning->shrink_factor
+ * tuning->growth_threshold));
+
+ if (!hash_rehash (table, candidate))
+ {
+ /* Failure to allocate memory in an attempt to
+ shrink the table is not fatal. But since memory
+ is low, we can at least be kind and free any
+ spare entries, rather than keeping them tied up
+ in the free entry list. */
+#if ! USE_OBSTACK
+ struct hash_entry *cursor = table->free_entry_list;
+ struct hash_entry *next;
+ while (cursor)
+ {
+ next = cursor->next;
+ free (cursor);
+ cursor = next;
+ }
+ table->free_entry_list = NULL;
+#endif
+ }
+ }
+ }
+ }
+
+ return data;
+}
+
+/* Testing. */
+
+#if TESTING
+
+void
+hash_print (const Hash_table *table)
+{
+ struct hash_entry *bucket = (struct hash_entry *) table->bucket;
+
+ for ( ; bucket < table->bucket_limit; bucket++)
+ {
+ struct hash_entry *cursor;
+
+ if (bucket)
+ printf ("%lu:\n", (unsigned long int) (bucket - table->bucket));
+
+ for (cursor = bucket; cursor; cursor = cursor->next)
+ {
+ char const *s = cursor->data;
+ /* FIXME */
+ if (s)
+ printf (" %s\n", s);
+ }
+ }
+}
+
+#endif /* TESTING */
diff --git a/libsbutil/gnulib/hash.h b/libsbutil/gnulib/hash.h
new file mode 100644
index 0000000..1e90c31
--- /dev/null
+++ b/libsbutil/gnulib/hash.h
@@ -0,0 +1,103 @@
+/* hash - hashing table processing.
+ Copyright (C) 1998-1999, 2001, 2003, 2009-2015 Free Software Foundation,
+ Inc.
+ Written by Jim Meyering <meyering@ascend.com>, 1998.
+
+ 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/>. */
+
+/* A generic hash table package. */
+
+/* Make sure USE_OBSTACK is defined to 1 if you want the allocator to use
+ obstacks instead of malloc, and recompile 'hash.c' with same setting. */
+
+#ifndef HASH_H_
+# define HASH_H_
+
+# include <stdio.h>
+# include <stdbool.h>
+
+/* The __attribute__ feature is available in gcc versions 2.5 and later.
+ The warn_unused_result attribute appeared first in gcc-3.4.0. */
+# if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+# define _GL_ATTRIBUTE_WUR __attribute__ ((__warn_unused_result__))
+# else
+# define _GL_ATTRIBUTE_WUR /* empty */
+# endif
+
+# ifndef _GL_ATTRIBUTE_DEPRECATED
+/* The __attribute__((__deprecated__)) feature
+ is available in gcc versions 3.1 and newer. */
+# if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 1)
+# define _GL_ATTRIBUTE_DEPRECATED /* empty */
+# else
+# define _GL_ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__))
+# endif
+# endif
+
+typedef size_t (*Hash_hasher) (const void *, size_t);
+typedef bool (*Hash_comparator) (const void *, const void *);
+typedef void (*Hash_data_freer) (void *);
+typedef bool (*Hash_processor) (void *, void *);
+
+struct hash_tuning
+ {
+ /* This structure is mainly used for 'hash_initialize', see the block
+ documentation of 'hash_reset_tuning' for more complete comments. */
+
+ float shrink_threshold; /* ratio of used buckets to trigger a shrink */
+ float shrink_factor; /* ratio of new smaller size to original size */
+ float growth_threshold; /* ratio of used buckets to trigger a growth */
+ float growth_factor; /* ratio of new bigger size to original size */
+ bool is_n_buckets; /* if CANDIDATE really means table size */
+ };
+
+typedef struct hash_tuning Hash_tuning;
+
+struct hash_table;
+
+typedef struct hash_table Hash_table;
+
+/* Information and lookup. */
+size_t hash_get_n_buckets (const Hash_table *) _GL_ATTRIBUTE_PURE;
+size_t hash_get_n_buckets_used (const Hash_table *) _GL_ATTRIBUTE_PURE;
+size_t hash_get_n_entries (const Hash_table *) _GL_ATTRIBUTE_PURE;
+size_t hash_get_max_bucket_length (const Hash_table *) _GL_ATTRIBUTE_PURE;
+bool hash_table_ok (const Hash_table *) _GL_ATTRIBUTE_PURE;
+void hash_print_statistics (const Hash_table *, FILE *);
+void *hash_lookup (const Hash_table *, const void *);
+
+/* Walking. */
+void *hash_get_first (const Hash_table *) _GL_ATTRIBUTE_PURE;
+void *hash_get_next (const Hash_table *, const void *);
+size_t hash_get_entries (const Hash_table *, void **, size_t);
+size_t hash_do_for_each (const Hash_table *, Hash_processor, void *);
+
+/* Allocation and clean-up. */
+size_t hash_string (const char *, size_t) _GL_ATTRIBUTE_PURE;
+void hash_reset_tuning (Hash_tuning *);
+Hash_table *hash_initialize (size_t, const Hash_tuning *,
+ Hash_hasher, Hash_comparator,
+ Hash_data_freer) _GL_ATTRIBUTE_WUR;
+void hash_clear (Hash_table *);
+void hash_free (Hash_table *);
+
+/* Insertion and deletion. */
+bool hash_rehash (Hash_table *, size_t) _GL_ATTRIBUTE_WUR;
+void *hash_insert (Hash_table *, const void *) _GL_ATTRIBUTE_WUR;
+
+int hash_insert_if_absent (Hash_table *table, const void *entry,
+ const void **matched_ent);
+void *hash_delete (Hash_table *, const void *);
+
+#endif
diff --git a/libsbutil/gnulib/pathmax.h b/libsbutil/gnulib/pathmax.h
new file mode 100644
index 0000000..2a5af08
--- /dev/null
+++ b/libsbutil/gnulib/pathmax.h
@@ -0,0 +1,83 @@
+/* Define PATH_MAX somehow. Requires sys/types.h.
+ Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009-2015 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 2, 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/>. */
+
+#ifndef _PATHMAX_H
+# define _PATHMAX_H
+
+/* POSIX:2008 defines PATH_MAX to be the maximum number of bytes in a filename,
+ including the terminating NUL byte.
+ <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html>
+ PATH_MAX is not defined on systems which have no limit on filename length,
+ such as GNU/Hurd.
+
+ This file does *not* define PATH_MAX always. Programs that use this file
+ can handle the GNU/Hurd case in several ways:
+ - Either with a package-wide handling, or with a per-file handling,
+ - Either through a
+ #ifdef PATH_MAX
+ or through a fallback like
+ #ifndef PATH_MAX
+ # define PATH_MAX 8192
+ #endif
+ or through a fallback like
+ #ifndef PATH_MAX
+ # define PATH_MAX pathconf ("/", _PC_PATH_MAX)
+ #endif
+ */
+
+# include <unistd.h>
+
+# include <limits.h>
+
+# ifndef _POSIX_PATH_MAX
+# define _POSIX_PATH_MAX 256
+# endif
+
+/* Don't include sys/param.h if it already has been. */
+# if defined HAVE_SYS_PARAM_H && !defined PATH_MAX && !defined MAXPATHLEN
+# include <sys/param.h>
+# endif
+
+# if !defined PATH_MAX && defined MAXPATHLEN
+# define PATH_MAX MAXPATHLEN
+# endif
+
+# ifdef __hpux
+/* On HP-UX, PATH_MAX designates the maximum number of bytes in a filename,
+ *not* including the terminating NUL byte, and is set to 1023.
+ Additionally, when _XOPEN_SOURCE is defined to 500 or more, PATH_MAX is
+ not defined at all any more. */
+# undef PATH_MAX
+# define PATH_MAX 1024
+# endif
+
+# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+/* The page "Naming Files, Paths, and Namespaces" on msdn.microsoft.com,
+ section "Maximum Path Length Limitation",
+ <http://msdn.microsoft.com/en-us/library/aa365247(v=vs.85).aspx#maxpath>
+ explains that the maximum size of a filename, including the terminating
+ NUL byte, is 260 = 3 + 256 + 1.
+ This is the same value as
+ - FILENAME_MAX in <stdio.h>,
+ - _MAX_PATH in <stdlib.h>,
+ - MAX_PATH in <windef.h>.
+ Undefine the original value, because mingw's <limits.h> gets it wrong. */
+# undef PATH_MAX
+# define PATH_MAX 260
+# endif
+
+#endif /* _PATHMAX_H */
diff --git a/libsbutil/gnulib/same-inode.h b/libsbutil/gnulib/same-inode.h
new file mode 100644
index 0000000..ecc3049
--- /dev/null
+++ b/libsbutil/gnulib/same-inode.h
@@ -0,0 +1,33 @@
+/* Determine whether two stat buffers refer to the same file.
+
+ Copyright (C) 2006, 2009-2015 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/>. */
+
+#ifndef SAME_INODE_H
+# define SAME_INODE_H 1
+
+# ifdef __VMS
+# define SAME_INODE(a, b) \
+ ((a).st_ino[0] == (b).st_ino[0] \
+ && (a).st_ino[1] == (b).st_ino[1] \
+ && (a).st_ino[2] == (b).st_ino[2] \
+ && (a).st_dev == (b).st_dev)
+# else
+# define SAME_INODE(a, b) \
+ ((a).st_ino == (b).st_ino \
+ && (a).st_dev == (b).st_dev)
+# endif
+
+#endif
diff --git a/libsbutil/gnulib/same.h b/libsbutil/gnulib/same.h
new file mode 100644
index 0000000..ee313c5
--- /dev/null
+++ b/libsbutil/gnulib/same.h
@@ -0,0 +1,25 @@
+/* Determine whether two file names refer to the same file.
+
+ Copyright (C) 1997-2000, 2003-2004, 2009-2015 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/>. */
+
+#ifndef SAME_H_
+# define SAME_H_ 1
+
+# include <stdbool.h>
+
+bool same_name (const char *source, const char *dest);
+
+#endif /* SAME_H_ */
diff --git a/libsbutil/gnulib/xalloc-oversized.h b/libsbutil/gnulib/xalloc-oversized.h
new file mode 100644
index 0000000..f0e9778
--- /dev/null
+++ b/libsbutil/gnulib/xalloc-oversized.h
@@ -0,0 +1,38 @@
+/* xalloc-oversized.h -- memory allocation size checking
+
+ Copyright (C) 1990-2000, 2003-2004, 2006-2015 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/>. */
+
+#ifndef XALLOC_OVERSIZED_H_
+# define XALLOC_OVERSIZED_H_
+
+# include <stddef.h>
+
+/* Return 1 if an array of N objects, each of size S, cannot exist due
+ to size arithmetic overflow. S must be positive and N must be
+ nonnegative. This is a macro, not a function, so that it
+ works correctly even when SIZE_MAX < N.
+
+ By gnulib convention, SIZE_MAX represents overflow in size
+ calculations, so the conservative dividend to use here is
+ SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
+ However, malloc (SIZE_MAX) fails on all known hosts where
+ sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
+ exactly-SIZE_MAX allocations on such hosts; this avoids a test and
+ branch when S is known to be 1. */
+# define xalloc_oversized(n, s) \
+ ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
+
+#endif /* !XALLOC_OVERSIZED_H_ */
diff --git a/libsbutil/gnulib/xalloc.h b/libsbutil/gnulib/xalloc.h
new file mode 100644
index 0000000..3077f27
--- /dev/null
+++ b/libsbutil/gnulib/xalloc.h
@@ -0,0 +1 @@
+#include "sbutil.h"
diff --git a/libsbutil/gnulib/xgetcwd.h b/libsbutil/gnulib/xgetcwd.h
new file mode 100644
index 0000000..765fab4
--- /dev/null
+++ b/libsbutil/gnulib/xgetcwd.h
@@ -0,0 +1,21 @@
+/* This is slightly wrong as libsbutil code is supposed to work both in
+ * libsandbox and in sandbox, but egetcwd is only available in the former.
+ * We'll worry about that if/when it becomes an issue for other programs.
+ *
+ * Copyright 1999-2015 Gentoo Foundation
+ * Licensed under the GPL-2
+ */
+
+_GL_INLINE_HEADER_BEGIN
+
+extern char *egetcwd(char *buf, size_t size);
+
+_GL_INLINE char *xgetcwd(void)
+{
+ char *ret = egetcwd(NULL, 0);
+ if (ret == NULL && errno == ENOMEM)
+ xalloc_die();
+ return ret;
+}
+
+_GL_INLINE_HEADER_END
diff --git a/libsbutil/sbutil.h b/libsbutil/sbutil.h
index c76465f..56fe6d3 100644
--- a/libsbutil/sbutil.h
+++ b/libsbutil/sbutil.h
@@ -140,10 +140,13 @@ char *__xstrndup(const char *str, size_t size, const char *file, const char *fun
#define xrealloc(_ptr, _size) __xrealloc(_ptr, _size, __FILE__, __func__, __LINE__)
#define xstrdup(_str) __xstrdup(_str, __FILE__, __func__, __LINE__)
#define xstrndup(_str, _size) __xstrndup(_str, _size, __FILE__, __func__, __LINE__)
+#define xalloc_die() __sb_ebort(__FILE__, __func__, __LINE__, "out of memory")
/* errno helpers */
#define save_errno() int old_errno = errno;
#define restore_errno() errno = old_errno;
#define saved_errno old_errno
+#include "gnulib/canonicalize.h"
+
#endif /* __SBUTIL_H__ */
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