libport: Add a memrchr() implementation.

[Francois Gouget]

It is not available on Solaris and FreeBSD 7.0.
---

We don't actually use it on Solaris... yet. But with the recent FreeBSD 
/ DragonFly BSD patches we now do use it on FreeBSD 7.0, which 
unfortunately did not have it.

 configure             |    1 +
 configure.ac          |    1 +
 include/wine/port.h   |    4 ++++
 libs/port/Makefile.in |    1 +
 libs/port/memrchr.c   |   39 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 46 insertions(+)
 create mode 100644 libs/port/memrchr.c

diff --git a/configure b/configure
index a6536b2..69fe48f 100755
--- a/configure
+++ b/configure
@@ -12789,6 +12789,7 @@ for ac_func in \
 	kqueue \
 	lstat \
 	memmove \
+	memrchr \
 	mmap \
 	pclose \
 	pipe2 \
diff --git a/configure.ac b/configure.ac
index 46e448e..cfc0950 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1985,6 +1985,7 @@ AC_CHECK_FUNCS(\
 	kqueue \
 	lstat \
 	memmove \
+	memrchr \
 	mmap \
 	pclose \
 	pipe2 \
diff --git a/include/wine/port.h b/include/wine/port.h
index 4b653c7..f31abf8 100644
--- a/include/wine/port.h
+++ b/include/wine/port.h
@@ -273,6 +273,10 @@ int lstat(const char *file_name, struct stat *buf);
 void *memmove(void *dest, const void *src, size_t len);
 #endif /* !defined(HAVE_MEMMOVE) */
 
+#ifndef HAVE_MEMRCHR
+void *memrchr( const void *source, int c, size_t n );
+#endif /* !defined(HAVE_MEMRCHR) */
+
 #ifndef HAVE_POLL
 struct pollfd
 {
diff --git a/libs/port/Makefile.in b/libs/port/Makefile.in
index f2f6db0..7a21ff2 100644
--- a/libs/port/Makefile.in
+++ b/libs/port/Makefile.in
@@ -15,6 +15,7 @@ C_SRCS = \
 	lstat.c \
 	memcpy_unaligned.c \
 	memmove.c \
+	memrchr.c \
 	mkstemps.c \
 	poll.c \
 	pread.c \
diff --git a/libs/port/memrchr.c b/libs/port/memrchr.c
new file mode 100644
index 0000000..647c403
--- /dev/null
+++ b/libs/port/memrchr.c
@@ -0,0 +1,39 @@
+/*
+ * memrchr function
+ *
+ * Copyright 2012 Francois Gouget
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include "config.h"
+#include "wine/port.h"
+
+#ifndef HAVE_MEMRCHR
+void *memrchr( const void *source, int c, size_t n )
+{
+    register const char *src = source;
+    register const char *tail = source + n;
+    void *match = NULL;
+
+    while (src < tail)
+    {
+        if (*src == c)
+            match = (void*)src;
+        src++;
+    }
+    return match;
+}
+#endif  /* HAVE_MEMRCHR */
-- 
1.7.10