Problem: strnlen may not be available

Solution: Provide an implementation

CMakeLists.txt

@@ -417,6 +417,10 @@ if(NOT MSVC)
   set(CMAKE_REQUIRED_INCLUDES sys/socket.h)
   check_function_exists(accept4 HAVE_ACCEPT4)
   set(CMAKE_REQUIRED_INCLUDES)
+
+  set(CMAKE_REQUIRED_INCLUDES string.h)
+  check_function_exists(strnlen HAVE_STRNLEN)
+  set(CMAKE_REQUIRED_INCLUDES)
 endif()
 
 add_definitions(-D_REENTRANT -D_THREAD_SAFE)

builds/cmake/platform.hpp.in

@@ -49,6 +49,7 @@
 #cmakedefine ZMQ_HAVE_PTHREAD_SETNAME_3
 #cmakedefine ZMQ_HAVE_PTHREAD_SET_NAME
 #cmakedefine HAVE_ACCEPT4
+#cmakedefine HAVE_STRNLEN
 
 #cmakedefine ZMQ_HAVE_OPENPGM
 #cmakedefine ZMQ_MAKE_VALGRIND_HAPPY

configure.ac

@@ -675,7 +675,7 @@ AC_LANG_POP([C++])
 
 # Checks for library functions.
 AC_TYPE_SIGNAL
-AC_CHECK_FUNCS(perror gettimeofday clock_gettime memset socket getifaddrs freeifaddrs fork mkdtemp accept4)
+AC_CHECK_FUNCS(perror gettimeofday clock_gettime memset socket getifaddrs freeifaddrs fork mkdtemp accept4 strnlen)
 AC_CHECK_HEADERS([alloca.h])
 
 # pthread_setname is non-posix, and there are at least 4 different implementations

src/ipc_address.cpp

@@ -37,6 +37,18 @@
 
 #include <string>
 
+#ifndef HAVE_STRNLEN
+static size_t strnlen (const char *s, size_t len)
+{
+    for (size_t i = 0; i < len; i++) {
+        if (s[i] == '\0')
+            return i + 1;
+    }
+
+    return len;
+}
+#endif
+
 zmq::ipc_address_t::ipc_address_t ()
 {
     memset (&_address, 0, sizeof _address);