memmem.c: New file, from gnulib.

	* memmem.c: New file, from gnulib.
	* configure.ac: Add memmem to list of functions provided if they
	are not available on the host.
	* Makefile.in: Rebuild dependencies.
	(CFILES): Add memmem.c.
	(CONFIGURED_OFILES): Add memmem.o.
	* configure, config.in, functions.texi: Rebuild.

From-SVN: r145139

libiberty/ChangeLog

+2008-03-27  Ian Lance Taylor  <iant@google.com>
+
+	* memmem.c: New file, from gnulib.
+	* configure.ac: Add memmem to list of functions provided if they
+	are not available on the host.
+	* Makefile.in: Rebuild dependencies.
+	(CFILES): Add memmem.c.
+	(CONFIGURED_OFILES): Add memmem.o.
+	* configure, config.in, functions.texi: Rebuild.
+
 2009-03-23  Jason Merrill  <jason@redhat.com>
 
 	* cp-demangle.c (d_expression): Handle pack expansion.

libiberty/Makefile.in

@@ -135,8 +135,8 @@ CFILES = alloca.c argv.c asprintf.c atexit.c				\
 	lbasename.c							\
 	lrealpath.c							\
 	make-relative-prefix.c						\
-	make-temp-file.c md5.c memchr.c memcmp.c memcpy.c memmove.c	\
-	 mempcpy.c memset.c mkstemps.c					\
+	make-temp-file.c md5.c memchr.c memcmp.c memcpy.c memmem.c	\
+	 memmove.c mempcpy.c memset.c mkstemps.c			\
 	objalloc.c obstack.c						\
 	partition.c pexecute.c						\
 	 pex-common.c pex-djgpp.c pex-msdos.c pex-one.c			\
@@ -187,8 +187,8 @@ CONFIGURED_OFILES = ./asprintf.o ./atexit.o				\
 	./ffs.o								\
 	./getcwd.o ./getpagesize.o ./gettimeofday.o			\
 	./index.o ./insque.o						\
-	./memchr.o ./memcmp.o ./memcpy.o ./memmove.o ./mempcpy.o	\
-	 ./memset.o ./mkstemps.o					\
+	./memchr.o ./memcmp.o ./memcpy.o ./memmem.o ./memmove.o		\
+	 ./mempcpy.o ./memset.o ./mkstemps.o				\
 	./pex-djgpp.o ./pex-msdos.o					\
 	 ./pex-unix.o ./pex-win32.o					\
 	 ./putenv.o							\
@@ -798,6 +798,12 @@ $(CONFIGURED_OFILES): stamp-picdir
 	else true; fi
 	$(COMPILE.c) $(srcdir)/memcpy.c $(OUTPUT_OPTION)
 
+./memmem.o: $(srcdir)/memmem.c config.h
+	if [ x"$(PICFLAG)" != x ]; then \
+	  $(COMPILE.c) $(PICFLAG) $(srcdir)/memmem.c -o pic/$@; \
+	else true; fi
+	$(COMPILE.c) $(srcdir)/memmem.c $(OUTPUT_OPTION)
+
 ./memmove.o: $(srcdir)/memmove.c $(INCDIR)/ansidecl.h
 	if [ x"$(PICFLAG)" != x ]; then \
 	  $(COMPILE.c) $(PICFLAG) $(srcdir)/memmove.c -o pic/$@; \

libiberty/config.in

@@ -139,6 +139,9 @@
 /* Define to 1 if you have the `memcpy' function. */
 #undef HAVE_MEMCPY
 
+/* Define to 1 if you have the `memmem' function. */
+#undef HAVE_MEMMEM
+
 /* Define to 1 if you have the `memmove' function. */
 #undef HAVE_MEMMOVE
 

libiberty/configure

@@ -5420,6 +5420,7 @@ funcs="$funcs insque"
 funcs="$funcs memchr"
 funcs="$funcs memcmp"
 funcs="$funcs memcpy"
+funcs="$funcs memmem"
 funcs="$funcs memmove"
 funcs="$funcs mempcpy"
 funcs="$funcs memset"
@@ -5532,9 +5533,10 @@ if test "x" = "y"; then
 
 
 
+
 for ac_func in asprintf atexit basename bcmp bcopy bsearch bzero calloc clock \
   getcwd getpagesize gettimeofday index insque mkstemps memchr memcmp memcpy \
-  memmove mempcpy memset putenv random rename rindex sigsetmask \
+  memmem memmove mempcpy memset putenv random rename rindex sigsetmask \
   strcasecmp setenv stpcpy stpncpy strchr strdup strncasecmp strndup strrchr strstr \
   strtod strtol strtoul strverscmp tmpnam vasprintf vfprintf vprintf \
   vsprintf waitpid getrusage on_exit psignal strerror strsignal \

libiberty/configure.ac

@@ -317,6 +317,7 @@ funcs="$funcs insque"
 funcs="$funcs memchr"
 funcs="$funcs memcmp"
 funcs="$funcs memcpy"
+funcs="$funcs memmem"
 funcs="$funcs memmove"
 funcs="$funcs mempcpy"
 funcs="$funcs memset"
@@ -362,7 +363,7 @@ checkfuncs="$checkfuncs getsysinfo table sysctl wait3 wait4 __fsetlocking"
 if test "x" = "y"; then
   AC_CHECK_FUNCS(asprintf atexit basename bcmp bcopy bsearch bzero calloc clock \
   getcwd getpagesize gettimeofday index insque mkstemps memchr memcmp memcpy \
-  memmove mempcpy memset putenv random rename rindex sigsetmask \
+  memmem memmove mempcpy memset putenv random rename rindex sigsetmask \
   strcasecmp setenv stpcpy stpncpy strchr strdup strncasecmp strndup strrchr strstr \
   strtod strtol strtoul strverscmp tmpnam vasprintf vfprintf vprintf \
   vsprintf waitpid getrusage on_exit psignal strerror strsignal \

libiberty/functions.texi

@@ -158,7 +158,7 @@ not recommended.
 
 @end deftypefn
 
-@c make-temp-file.c:87
+@c make-temp-file.c:95
 @deftypefn Replacement char* choose_tmpdir ()
 
 Returns a pointer to a directory path suitable for creating temporary
@@ -602,7 +602,7 @@ relative prefix can be found, return @code{NULL}.
 
 @end deftypefn
 
-@c make-temp-file.c:137
+@c make-temp-file.c:163
 @deftypefn Replacement char* make_temp_file (const char *@var{suffix})
 
 Return a temporary file name (as a string) or @code{NULL} if unable to
@@ -643,6 +643,15 @@ Copies @var{length} bytes from memory region @var{in} to region
 
 @end deftypefn
 
+@c memmem.c:20
+@deftypefn Supplemental void* memmem (const void *@var{haystack}, size_t @var{haystack_len} const void *@var{needle}, size_t @var{needle_len})
+
+Returns a pointer to the first occurrence of @var{needle} (length
+@var{needle_len}) in @var{haystack} (length @var{haystack_len}).
+Returns @code{NULL} if not found.
+
+@end deftypefn
+
 @c memmove.c:6
 @deftypefn Supplemental void* memmove (void *@var{from}, const void *@var{to}, size_t @var{count})
 

libiberty/memmem.c

+/* Copyright (C) 1991,92,93,94,96,97,98,2000,2004,2007 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/*
+
+@deftypefn Supplemental void* memmem (const void *@var{haystack}, size_t @var{haystack_len} const void *@var{needle}, size_t @var{needle_len})
+
+Returns a pointer to the first occurrence of @var{needle} (length
+@var{needle_len}) in @var{haystack} (length @var{haystack_len}).
+Returns @code{NULL} if not found.
+
+@end deftypefn
+
+*/
+
+#ifndef _LIBC
+# include <config.h>
+#endif
+
+#include <stddef.h>
+#include <string.h>
+
+#ifndef _LIBC
+# define __builtin_expect(expr, val)   (expr)
+#endif
+
+#undef memmem
+
+/* Return the first occurrence of NEEDLE in HAYSTACK.  */
+void *
+memmem (const void *haystack, size_t haystack_len, const void *needle,
+	size_t needle_len)
+{
+  const char *begin;
+  const char *const last_possible
+    = (const char *) haystack + haystack_len - needle_len;
+
+  if (needle_len == 0)
+    /* The first occurrence of the empty string is deemed to occur at
+       the beginning of the string.  */
+    return (void *) haystack;
+
+  /* Sanity check, otherwise the loop might search through the whole
+     memory.  */
+  if (__builtin_expect (haystack_len < needle_len, 0))
+    return NULL;
+
+  for (begin = (const char *) haystack; begin <= last_possible; ++begin)
+    if (begin[0] == ((const char *) needle)[0] &&
+	!memcmp ((const void *) &begin[1],
+		 (const void *) ((const char *) needle + 1),
+		 needle_len - 1))
+      return (void *) begin;
+
+  return NULL;
+}