string: Implement strnlen() if it is missing.

diff --git a/configure.ac b/configure.ac
index 28af2fe..47d0907 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -56,7 +56,7 @@ OVS_CHECK_IF_PACKET
 OVS_CHECK_STRTOK_R
 AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec, struct stat.st_mtimensec],
   [], [], [[#include <sys/stat.h>]])
-AC_CHECK_FUNCS([mlockall strsignal getloadavg statvfs setmntent])
+AC_CHECK_FUNCS([mlockall strnlen strsignal getloadavg statvfs setmntent])
 AC_CHECK_HEADERS([mntent.h sys/statvfs.h])
 
 OVS_CHECK_PKIDIR

diff --git a/lib/string.c b/lib/string.c
new file mode 100644 (file)
index 0000000..f9ce788
--- /dev/null
+++ b/lib/string.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2009, 2011 Nicira Networks.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+
+#include <string.h>
+
+#ifndef HAVE_STRNLEN
+size_t
+strnlen(const char *s, size_t maxlen)
+{
+    const char *end = memchr(s, '\0', maxlen);
+    return end ? end - s : maxlen;
+}
+#endif

diff --git a/lib/string.h b/lib/string.h
index 779a9e6..5e372bb 100644 (file)
--- a/lib/string.h
+++ b/lib/string.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009 Nicira Networks.
+ * Copyright (c) 2009, 2011 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -31,4 +31,10 @@
 #undef strtok_r
 #endif
 
+#ifndef HAVE_STRNLEN
+#undef strnlen
+#define strnlen rpl_strnlen
+size_t strnlen(const char *, size_t maxlen);
+#endif
+
 #endif /* string.h wrapper */