Import strchrnul from gnulib and use it

For a forthcoming patch, I need a "skip_to_colon" function.  I noticed
there are two skip_to_semicolon (one in gdb and one in gdbserver). I
thought we could put it in common/, and generalize it for any character.
It turns out that the strchrnul function does exactly that.  I imported
the corresponding module from gnulib, for those systems that do not have
it.

There are probably more places where this function can be used instead
of doing the work by hand (I am looking at
remote-utils.c::look_up_one_symbol).

gdb/ChangeLog:

	* remote.c (skip_to_semicolon): Remove.
	(remote_parse_stop_reply): Use strchrnul instead of
	skip_to_semicolon.
	* gnulib/update-gnulib.sh (IMPORTED_GNULIB_MODULES): Add
	strchrnul.
	* gnulib/aclocal.m4: Regenerate.
	* gnulib/config.in: Regenerate.
	* gnulib/configure: Regenerate.
	* gnulib/import/Makefile.am: Regenerate.
	* gnulib/import/Makefile.in: Regenerate.
	* gnulib/import/m4/gnulib-cache.m4: Regenerate.
	* gnulib/import/m4/gnulib-comp.m4: Regenerate.
	* gnulib/import/m4/rawmemchr.m4: New file.
	* gnulib/import/m4/strchrnul.m4: New file.
	* gnulib/import/rawmemchr.c: New file.
	* gnulib/import/rawmemchr.valgrind: New file.
	* gnulib/import/strchrnul.c: New file.
	* gnulib/import/strchrnul.valgrind: New file.

gdb/gdbserver/ChangeLog:

	* server.c (skip_to_semicolon):  Remove.
	(process_point_options): Use strchrnul instead of
	skip_to_semicolon.

10 files changed, 428 insertions, 12 deletions

diff --git a/gdb/gnulib/import/Makefile.am b/gdb/gnulib/import/Makefile.am
index 32dab67..3fb324b 100644
--- a/gdb/gnulib/import/Makefile.am
+++ b/gdb/gnulib/import/Makefile.am
@@ -21,7 +21,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=import --m4-base=import/m4 --doc-base=doc --tests-base=tests --aux-dir=import/extra --no-conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca canonicalize-lgpl dirent dirfd errno fnmatch-gnu frexpl inttypes lstat memchr memmem pathmax readlink rename signal-h strstr strtok_r sys_stat unistd update-copyright wchar wctype-h
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=import --m4-base=import/m4 --doc-base=doc --tests-base=tests --aux-dir=import/extra --no-conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca canonicalize-lgpl dirent dirfd errno fnmatch-gnu frexpl inttypes lstat memchr memmem pathmax readlink rename signal-h strchrnul strstr strtok_r sys_stat unistd update-copyright wchar wctype-h
 
 AUTOMAKE_OPTIONS = 1.9.6 gnits
 
@@ -842,6 +842,15 @@ EXTRA_DIST += pathmax.h
 
 ## end   gnulib module pathmax
 
+## begin gnulib module rawmemchr
+
+
+EXTRA_DIST += rawmemchr.c rawmemchr.valgrind
+
+EXTRA_libgnu_a_SOURCES += rawmemchr.c
+
+## end   gnulib module rawmemchr
+
 ## begin gnulib module readlink
 
 
@@ -1345,6 +1354,15 @@ EXTRA_DIST += stdlib.in.h
 
 ## end   gnulib module stdlib
 
+## begin gnulib module strchrnul
+
+
+EXTRA_DIST += strchrnul.c strchrnul.valgrind
+
+EXTRA_libgnu_a_SOURCES += strchrnul.c
+
+## end   gnulib module strchrnul
+
 ## begin gnulib module streq
 
 
diff --git a/gdb/gnulib/import/Makefile.in b/gdb/gnulib/import/Makefile.in
index f2324d0..d771e15 100644
--- a/gdb/gnulib/import/Makefile.in
+++ b/gdb/gnulib/import/Makefile.in
@@ -36,7 +36,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=import --m4-base=import/m4 --doc-base=doc --tests-base=tests --aux-dir=import/extra --no-conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca canonicalize-lgpl dirent dirfd errno fnmatch-gnu frexpl inttypes lstat memchr memmem pathmax readlink rename signal-h strstr strtok_r sys_stat unistd update-copyright wchar wctype-h
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=import --m4-base=import/m4 --doc-base=doc --tests-base=tests --aux-dir=import/extra --no-conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca canonicalize-lgpl dirent dirfd errno fnmatch-gnu frexpl inttypes lstat memchr memmem pathmax readlink rename signal-h strchrnul strstr strtok_r sys_stat unistd update-copyright wchar wctype-h
 
 
 
@@ -115,6 +115,7 @@ am__aclocal_m4_deps = $(top_srcdir)/import/m4/00gnulib.m4 \
 	$(top_srcdir)/import/m4/nocrash.m4 \
 	$(top_srcdir)/import/m4/off_t.m4 \
 	$(top_srcdir)/import/m4/pathmax.m4 \
+	$(top_srcdir)/import/m4/rawmemchr.m4 \
 	$(top_srcdir)/import/m4/readlink.m4 \
 	$(top_srcdir)/import/m4/rename.m4 \
 	$(top_srcdir)/import/m4/rmdir.m4 \
@@ -126,6 +127,7 @@ am__aclocal_m4_deps = $(top_srcdir)/import/m4/00gnulib.m4 \
 	$(top_srcdir)/import/m4/stdint.m4 \
 	$(top_srcdir)/import/m4/stdio_h.m4 \
 	$(top_srcdir)/import/m4/stdlib_h.m4 \
+	$(top_srcdir)/import/m4/strchrnul.m4 \
 	$(top_srcdir)/import/m4/string_h.m4 \
 	$(top_srcdir)/import/m4/strstr.m4 \
 	$(top_srcdir)/import/m4/strtok_r.m4 \
@@ -1277,17 +1279,18 @@ EXTRA_DIST = m4/gnulib-cache.m4 alloca.c alloca.in.h \
 	ref-add.sin ref-del.sin lstat.c malloc.c malloca.h \
 	malloca.valgrind math.in.h mbrtowc.c mbsinit.c \
 	mbsrtowcs-impl.h mbsrtowcs-state.c mbsrtowcs.c memchr.c \
-	memchr.valgrind memmem.c str-two-way.h pathmax.h readlink.c \
-	rename.c rmdir.c same-inode.h signal.in.h \
-	$(top_srcdir)/import/extra/snippet/_Noreturn.h \
+	memchr.valgrind memmem.c str-two-way.h pathmax.h rawmemchr.c \
+	rawmemchr.valgrind readlink.c rename.c rmdir.c same-inode.h \
+	signal.in.h $(top_srcdir)/import/extra/snippet/_Noreturn.h \
 	$(top_srcdir)/import/extra/snippet/arg-nonnull.h \
 	$(top_srcdir)/import/extra/snippet/c++defs.h \
 	$(top_srcdir)/import/extra/snippet/warn-on-use.h stat.c \
 	stdbool.in.h stddef.in.h stdint.in.h stdio.in.h stdlib.in.h \
-	streq.h string.in.h str-two-way.h strstr.c strtok_r.c \
-	sys_stat.in.h sys_time.in.h sys_types.in.h time.in.h \
-	unistd.in.h $(top_srcdir)/import/extra/update-copyright \
-	verify.h wchar.in.h wctype.in.h
+	strchrnul.c strchrnul.valgrind streq.h string.in.h \
+	str-two-way.h strstr.c strtok_r.c sys_stat.in.h sys_time.in.h \
+	sys_types.in.h time.in.h unistd.in.h \
+	$(top_srcdir)/import/extra/update-copyright verify.h \
+	wchar.in.h wctype.in.h
 
 # The BUILT_SOURCES created by this Makefile snippet are not used via #include
 # statements but through direct file reference. Therefore this snippet must be
@@ -1330,8 +1333,8 @@ EXTRA_libgnu_a_SOURCES = alloca.c canonicalize-lgpl.c dirfd.c float.c \
 	itold.c fnmatch.c fnmatch_loop.c frexp.c frexp.c frexpl.c \
 	gettimeofday.c isnan.c isnand.c isnan.c isnanl.c lstat.c \
 	malloc.c mbrtowc.c mbsinit.c mbsrtowcs-state.c mbsrtowcs.c \
-	memchr.c memmem.c readlink.c rename.c rmdir.c stat.c strstr.c \
-	strtok_r.c
+	memchr.c memmem.c rawmemchr.c readlink.c rename.c rmdir.c \
+	stat.c strchrnul.c strstr.c strtok_r.c
 
 # Use this preprocessor expression to decide whether #include_next works.
 # Do not rely on a 'configure'-time test for this, since the expression
@@ -1432,10 +1435,12 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/mbsrtowcs.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/memchr.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/memmem.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/rawmemchr.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/readlink.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/rename.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/rmdir.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/stat.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/strchrnul.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/stripslash.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/strnlen1.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/strstr.Po@am__quote@
diff --git a/gdb/gnulib/import/m4/gnulib-cache.m4 b/gdb/gnulib/import/m4/gnulib-cache.m4
index a873208..a52dec6 100644
--- a/gdb/gnulib/import/m4/gnulib-cache.m4
+++ b/gdb/gnulib/import/m4/gnulib-cache.m4
@@ -27,7 +27,7 @@
 
 
 # Specification in the form of a command-line invocation:
-#   gnulib-tool --import --dir=. --lib=libgnu --source-base=import --m4-base=import/m4 --doc-base=doc --tests-base=tests --aux-dir=import/extra --no-conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca canonicalize-lgpl dirent dirfd errno fnmatch-gnu frexpl inttypes lstat memchr memmem pathmax readlink rename signal-h strstr strtok_r sys_stat unistd update-copyright wchar wctype-h
+#   gnulib-tool --import --dir=. --lib=libgnu --source-base=import --m4-base=import/m4 --doc-base=doc --tests-base=tests --aux-dir=import/extra --no-conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca canonicalize-lgpl dirent dirfd errno fnmatch-gnu frexpl inttypes lstat memchr memmem pathmax readlink rename signal-h strchrnul strstr strtok_r sys_stat unistd update-copyright wchar wctype-h
 
 # Specification in the form of a few gnulib-tool.m4 macro invocations:
 gl_LOCAL_DIR([])
@@ -47,6 +47,7 @@ gl_MODULES([
   readlink
   rename
   signal-h
+  strchrnul
   strstr
   strtok_r
   sys_stat
diff --git a/gdb/gnulib/import/m4/gnulib-comp.m4 b/gdb/gnulib/import/m4/gnulib-comp.m4
index 01912bb..235dbb8 100644
--- a/gdb/gnulib/import/m4/gnulib-comp.m4
+++ b/gdb/gnulib/import/m4/gnulib-comp.m4
@@ -83,6 +83,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module multiarch:
   # Code from module nocrash:
   # Code from module pathmax:
+  # Code from module rawmemchr:
   # Code from module readlink:
   # Code from module rename:
   # Code from module rmdir:
@@ -99,6 +100,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module stdint:
   # Code from module stdio:
   # Code from module stdlib:
+  # Code from module strchrnul:
   # Code from module streq:
   # Code from module string:
   # Code from module strnlen1:
@@ -251,6 +253,12 @@ AC_DEFUN([gl_INIT],
   gl_STRING_MODULE_INDICATOR([memmem])
   gl_MULTIARCH
   gl_PATHMAX
+  gl_FUNC_RAWMEMCHR
+  if test $HAVE_RAWMEMCHR = 0; then
+    AC_LIBOBJ([rawmemchr])
+    gl_PREREQ_RAWMEMCHR
+  fi
+  gl_STRING_MODULE_INDICATOR([rawmemchr])
   gl_FUNC_READLINK
   if test $HAVE_READLINK = 0 || test $REPLACE_READLINK = 1; then
     AC_LIBOBJ([readlink])
@@ -280,6 +288,12 @@ AC_DEFUN([gl_INIT],
   gl_STDINT_H
   gl_STDIO_H
   gl_STDLIB_H
+  gl_FUNC_STRCHRNUL
+  if test $HAVE_STRCHRNUL = 0 || test $REPLACE_STRCHRNUL = 1; then
+    AC_LIBOBJ([strchrnul])
+    gl_PREREQ_STRCHRNUL
+  fi
+  gl_STRING_MODULE_INDICATOR([strchrnul])
   gl_HEADER_STRING_H
   gl_FUNC_STRSTR
   if test $REPLACE_STRSTR = 1; then
@@ -497,6 +511,8 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/memchr.valgrind
   lib/memmem.c
   lib/pathmax.h
+  lib/rawmemchr.c
+  lib/rawmemchr.valgrind
   lib/readlink.c
   lib/ref-add.sin
   lib/ref-del.sin
@@ -511,6 +527,8 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/stdio.in.h
   lib/stdlib.in.h
   lib/str-two-way.h
+  lib/strchrnul.c
+  lib/strchrnul.valgrind
   lib/streq.h
   lib/string.in.h
   lib/stripslash.c
@@ -579,6 +597,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/nocrash.m4
   m4/off_t.m4
   m4/pathmax.m4
+  m4/rawmemchr.m4
   m4/readlink.m4
   m4/rename.m4
   m4/rmdir.m4
@@ -590,6 +609,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/stdint.m4
   m4/stdio_h.m4
   m4/stdlib_h.m4
+  m4/strchrnul.m4
   m4/string_h.m4
   m4/strstr.m4
   m4/strtok_r.m4
diff --git a/gdb/gnulib/import/m4/rawmemchr.m4 b/gdb/gnulib/import/m4/rawmemchr.m4
new file mode 100644
index 0000000..88e815e
--- /dev/null
+++ b/gdb/gnulib/import/m4/rawmemchr.m4
@@ -0,0 +1,20 @@
+# rawmemchr.m4 serial 2
+dnl Copyright (C) 2003, 2007-2015 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_RAWMEMCHR],
+[
+  dnl Persuade glibc <string.h> to declare rawmemchr().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_CHECK_FUNCS([rawmemchr])
+  if test $ac_cv_func_rawmemchr = no; then
+    HAVE_RAWMEMCHR=0
+  fi
+])
+
+# Prerequisites of lib/strchrnul.c.
+AC_DEFUN([gl_PREREQ_RAWMEMCHR], [:])
diff --git a/gdb/gnulib/import/m4/strchrnul.m4 b/gdb/gnulib/import/m4/strchrnul.m4
new file mode 100644
index 0000000..8c3d4cf
--- /dev/null
+++ b/gdb/gnulib/import/m4/strchrnul.m4
@@ -0,0 +1,50 @@
+# strchrnul.m4 serial 9
+dnl Copyright (C) 2003, 2007, 2009-2015 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_STRCHRNUL],
+[
+  dnl Persuade glibc <string.h> to declare strchrnul().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_CHECK_FUNCS([strchrnul])
+  if test $ac_cv_func_strchrnul = no; then
+    HAVE_STRCHRNUL=0
+  else
+    AC_CACHE_CHECK([whether strchrnul works],
+      [gl_cv_func_strchrnul_works],
+      [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <string.h> /* for strchrnul */
+]], [[const char *buf = "a";
+      return strchrnul (buf, 'b') != buf + 1;
+    ]])],
+        [gl_cv_func_strchrnul_works=yes],
+        [gl_cv_func_strchrnul_works=no],
+        [dnl Cygwin 1.7.9 introduced strchrnul, but it was broken until 1.7.10
+         AC_EGREP_CPP([Lucky user],
+           [
+#if defined __CYGWIN__
+ #include <cygwin/version.h>
+ #if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 9)
+  Lucky user
+ #endif
+#else
+  Lucky user
+#endif
+           ],
+           [gl_cv_func_strchrnul_works="guessing yes"],
+           [gl_cv_func_strchrnul_works="guessing no"])
+        ])
+      ])
+    case "$gl_cv_func_strchrnul_works" in
+      *yes) ;;
+      *) REPLACE_STRCHRNUL=1 ;;
+    esac
+  fi
+])
+
+# Prerequisites of lib/strchrnul.c.
+AC_DEFUN([gl_PREREQ_STRCHRNUL], [:])
diff --git a/gdb/gnulib/import/rawmemchr.c b/gdb/gnulib/import/rawmemchr.c
new file mode 100644
index 0000000..a6380ba
--- /dev/null
+++ b/gdb/gnulib/import/rawmemchr.c
@@ -0,0 +1,136 @@
+/* Searching in a string.
+   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/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <string.h>
+
+/* Find the first occurrence of C in S.  */
+void *
+rawmemchr (const void *s, int c_in)
+{
+  /* On 32-bit hardware, choosing longword to be a 32-bit unsigned
+     long instead of a 64-bit uintmax_t tends to give better
+     performance.  On 64-bit hardware, unsigned long is generally 64
+     bits already.  Change this typedef to experiment with
+     performance.  */
+  typedef unsigned long int longword;
+
+  const unsigned char *char_ptr;
+  const longword *longword_ptr;
+  longword repeated_one;
+  longword repeated_c;
+  unsigned char c;
+
+  c = (unsigned char) c_in;
+
+  /* Handle the first few bytes by reading one byte at a time.
+     Do this until CHAR_PTR is aligned on a longword boundary.  */
+  for (char_ptr = (const unsigned char *) s;
+       (size_t) char_ptr % sizeof (longword) != 0;
+       ++char_ptr)
+    if (*char_ptr == c)
+      return (void *) char_ptr;
+
+  longword_ptr = (const longword *) char_ptr;
+
+  /* All these elucidatory comments refer to 4-byte longwords,
+     but the theory applies equally well to any size longwords.  */
+
+  /* Compute auxiliary longword values:
+     repeated_one is a value which has a 1 in every byte.
+     repeated_c has c in every byte.  */
+  repeated_one = 0x01010101;
+  repeated_c = c | (c << 8);
+  repeated_c |= repeated_c << 16;
+  if (0xffffffffU < (longword) -1)
+    {
+      repeated_one |= repeated_one << 31 << 1;
+      repeated_c |= repeated_c << 31 << 1;
+      if (8 < sizeof (longword))
+        {
+          size_t i;
+
+          for (i = 64; i < sizeof (longword) * 8; i *= 2)
+            {
+              repeated_one |= repeated_one << i;
+              repeated_c |= repeated_c << i;
+            }
+        }
+    }
+
+  /* Instead of the traditional loop which tests each byte, we will
+     test a longword at a time.  The tricky part is testing if *any of
+     the four* bytes in the longword in question are equal to NUL or
+     c.  We first use an xor with repeated_c.  This reduces the task
+     to testing whether *any of the four* bytes in longword1 is zero.
+
+     We compute tmp =
+       ((longword1 - repeated_one) & ~longword1) & (repeated_one << 7).
+     That is, we perform the following operations:
+       1. Subtract repeated_one.
+       2. & ~longword1.
+       3. & a mask consisting of 0x80 in every byte.
+     Consider what happens in each byte:
+       - If a byte of longword1 is zero, step 1 and 2 transform it into 0xff,
+         and step 3 transforms it into 0x80.  A carry can also be propagated
+         to more significant bytes.
+       - If a byte of longword1 is nonzero, let its lowest 1 bit be at
+         position k (0 <= k <= 7); so the lowest k bits are 0.  After step 1,
+         the byte ends in a single bit of value 0 and k bits of value 1.
+         After step 2, the result is just k bits of value 1: 2^k - 1.  After
+         step 3, the result is 0.  And no carry is produced.
+     So, if longword1 has only non-zero bytes, tmp is zero.
+     Whereas if longword1 has a zero byte, call j the position of the least
+     significant zero byte.  Then the result has a zero at positions 0, ...,
+     j-1 and a 0x80 at position j.  We cannot predict the result at the more
+     significant bytes (positions j+1..3), but it does not matter since we
+     already have a non-zero bit at position 8*j+7.
+
+     The test whether any byte in longword1 is zero is equivalent
+     to testing whether tmp is nonzero.
+
+     This test can read beyond the end of a string, depending on where
+     C_IN is encountered.  However, this is considered safe since the
+     initialization phase ensured that the read will be aligned,
+     therefore, the read will not cross page boundaries and will not
+     cause a fault.  */
+
+  while (1)
+    {
+      longword longword1 = *longword_ptr ^ repeated_c;
+
+      if ((((longword1 - repeated_one) & ~longword1)
+           & (repeated_one << 7)) != 0)
+        break;
+      longword_ptr++;
+    }
+
+  char_ptr = (const unsigned char *) longword_ptr;
+
+  /* At this point, we know that one of the sizeof (longword) bytes
+     starting at char_ptr is == c.  On little-endian machines, we
+     could determine the first such byte without any further memory
+     accesses, just by looking at the tmp result from the last loop
+     iteration.  But this does not work on big-endian machines.
+     Choose code that works in both cases.  */
+
+  char_ptr = (unsigned char *) longword_ptr;
+  while (*char_ptr != c)
+    char_ptr++;
+  return (void *) char_ptr;
+}
diff --git a/gdb/gnulib/import/rawmemchr.valgrind b/gdb/gnulib/import/rawmemchr.valgrind
new file mode 100644
index 0000000..6363923
--- /dev/null
+++ b/gdb/gnulib/import/rawmemchr.valgrind
@@ -0,0 +1,12 @@
+# Suppress a valgrind message about use of uninitialized memory in rawmemchr().
+# This use is OK because it provides only a speedup.
+{
+    rawmemchr-value4
+    Memcheck:Value4
+    fun:rawmemchr
+}
+{
+    rawmemchr-value8
+    Memcheck:Value8
+    fun:rawmemchr
+}
diff --git a/gdb/gnulib/import/strchrnul.c b/gdb/gnulib/import/strchrnul.c
new file mode 100644
index 0000000..1000e83
--- /dev/null
+++ b/gdb/gnulib/import/strchrnul.c
@@ -0,0 +1,142 @@
+/* Searching in a string.
+   Copyright (C) 2003, 2007-2015 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>
+
+/* Specification.  */
+#include <string.h>
+
+/* Find the first occurrence of C in S or the final NUL byte.  */
+char *
+strchrnul (const char *s, int c_in)
+{
+  /* On 32-bit hardware, choosing longword to be a 32-bit unsigned
+     long instead of a 64-bit uintmax_t tends to give better
+     performance.  On 64-bit hardware, unsigned long is generally 64
+     bits already.  Change this typedef to experiment with
+     performance.  */
+  typedef unsigned long int longword;
+
+  const unsigned char *char_ptr;
+  const longword *longword_ptr;
+  longword repeated_one;
+  longword repeated_c;
+  unsigned char c;
+
+  c = (unsigned char) c_in;
+  if (!c)
+    return rawmemchr (s, 0);
+
+  /* Handle the first few bytes by reading one byte at a time.
+     Do this until CHAR_PTR is aligned on a longword boundary.  */
+  for (char_ptr = (const unsigned char *) s;
+       (size_t) char_ptr % sizeof (longword) != 0;
+       ++char_ptr)
+    if (!*char_ptr || *char_ptr == c)
+      return (char *) char_ptr;
+
+  longword_ptr = (const longword *) char_ptr;
+
+  /* All these elucidatory comments refer to 4-byte longwords,
+     but the theory applies equally well to any size longwords.  */
+
+  /* Compute auxiliary longword values:
+     repeated_one is a value which has a 1 in every byte.
+     repeated_c has c in every byte.  */
+  repeated_one = 0x01010101;
+  repeated_c = c | (c << 8);
+  repeated_c |= repeated_c << 16;
+  if (0xffffffffU < (longword) -1)
+    {
+      repeated_one |= repeated_one << 31 << 1;
+      repeated_c |= repeated_c << 31 << 1;
+      if (8 < sizeof (longword))
+        {
+          size_t i;
+
+          for (i = 64; i < sizeof (longword) * 8; i *= 2)
+            {
+              repeated_one |= repeated_one << i;
+              repeated_c |= repeated_c << i;
+            }
+        }
+    }
+
+  /* Instead of the traditional loop which tests each byte, we will
+     test a longword at a time.  The tricky part is testing if *any of
+     the four* bytes in the longword in question are equal to NUL or
+     c.  We first use an xor with repeated_c.  This reduces the task
+     to testing whether *any of the four* bytes in longword1 or
+     longword2 is zero.
+
+     Let's consider longword1.  We compute tmp =
+       ((longword1 - repeated_one) & ~longword1) & (repeated_one << 7).
+     That is, we perform the following operations:
+       1. Subtract repeated_one.
+       2. & ~longword1.
+       3. & a mask consisting of 0x80 in every byte.
+     Consider what happens in each byte:
+       - If a byte of longword1 is zero, step 1 and 2 transform it into 0xff,
+         and step 3 transforms it into 0x80.  A carry can also be propagated
+         to more significant bytes.
+       - If a byte of longword1 is nonzero, let its lowest 1 bit be at
+         position k (0 <= k <= 7); so the lowest k bits are 0.  After step 1,
+         the byte ends in a single bit of value 0 and k bits of value 1.
+         After step 2, the result is just k bits of value 1: 2^k - 1.  After
+         step 3, the result is 0.  And no carry is produced.
+     So, if longword1 has only non-zero bytes, tmp is zero.
+     Whereas if longword1 has a zero byte, call j the position of the least
+     significant zero byte.  Then the result has a zero at positions 0, ...,
+     j-1 and a 0x80 at position j.  We cannot predict the result at the more
+     significant bytes (positions j+1..3), but it does not matter since we
+     already have a non-zero bit at position 8*j+7.
+
+     The test whether any byte in longword1 or longword2 is zero is equivalent
+     to testing whether tmp1 is nonzero or tmp2 is nonzero.  We can combine
+     this into a single test, whether (tmp1 | tmp2) is nonzero.
+
+     This test can read more than one byte beyond the end of a string,
+     depending on where the terminating NUL is encountered.  However,
+     this is considered safe since the initialization phase ensured
+     that the read will be aligned, therefore, the read will not cross
+     page boundaries and will not cause a fault.  */
+
+  while (1)
+    {
+      longword longword1 = *longword_ptr ^ repeated_c;
+      longword longword2 = *longword_ptr;
+
+      if (((((longword1 - repeated_one) & ~longword1)
+            | ((longword2 - repeated_one) & ~longword2))
+           & (repeated_one << 7)) != 0)
+        break;
+      longword_ptr++;
+    }
+
+  char_ptr = (const unsigned char *) longword_ptr;
+
+  /* At this point, we know that one of the sizeof (longword) bytes
+     starting at char_ptr is == 0 or == c.  On little-endian machines,
+     we could determine the first such byte without any further memory
+     accesses, just by looking at the tmp result from the last loop
+     iteration.  But this does not work on big-endian machines.
+     Choose code that works in both cases.  */
+
+  char_ptr = (unsigned char *) longword_ptr;
+  while (*char_ptr && (*char_ptr != c))
+    char_ptr++;
+  return (char *) char_ptr;
+}
diff --git a/gdb/gnulib/import/strchrnul.valgrind b/gdb/gnulib/import/strchrnul.valgrind
new file mode 100644
index 0000000..b14fa13
--- /dev/null
+++ b/gdb/gnulib/import/strchrnul.valgrind
@@ -0,0 +1,12 @@
+# Suppress a valgrind message about use of uninitialized memory in strchrnul().
+# This use is OK because it provides only a speedup.
+{
+    strchrnul-value4
+    Memcheck:Value4
+    fun:strchrnul
+}
+{
+    strchrnul-value8
+    Memcheck:Value8
+    fun:strchrnul
+}