Use kqueue on Darwin as well

Since poll() is implemented in terms of kqueue() there,
it doesn't seem like this could have improved anything.

Besides man 3 ev, libevent code, and [1],
I haven't managed to find much relevant information.

[1] https://daniel.haxx.se/blog/2016/10/11/poll-on-mac-10-12-is-broken/

CMakeLists.txt

@@ -4,9 +4,9 @@ cmake_minimum_required (VERSION 2.8.5)
 # Moar warnings
 if ("${CMAKE_C_COMPILER_ID}" MATCHES "GNU" OR CMAKE_COMPILER_IS_GNUCC)
 	# -Wunused-function is pretty annoying here, as everything is static
-	set (wdisabled "-Wno-unused-function -Wno-implicit-fallthrough")
+	set (wdisabled "-Wno-unused-function")
 	set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -Wall -Wextra ${wdisabled}")
-endif ("${CMAKE_C_COMPILER_ID}" MATCHES "GNU" OR CMAKE_COMPILER_IS_GNUCC)
+endif ()
 
 # Dependencies
 set (CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
@@ -16,11 +16,9 @@ find_package (PkgConfig REQUIRED)
 pkg_check_modules (libssl REQUIRED libssl libcrypto)
 
 if ("${CMAKE_SYSTEM_NAME}" MATCHES "BSD")
-	include_directories (/usr/local/include)
-	link_directories (/usr/local/lib)
 	# Our POSIX version macros make these undefined
 	add_definitions (-D__BSD_VISIBLE=1 -D_BSD_SOURCE=1)
-endif ("${CMAKE_SYSTEM_NAME}" MATCHES "BSD")
+endif ()
 
 set (common_libraries ${libssl_LIBRARIES})
 include_directories (${libssl_INCLUDE_DIRS})
@@ -32,8 +30,8 @@ foreach (extra iconv rt)
 	find_library (extra_lib_${extra} ${extra})
 	if (extra_lib_${extra})
 		list (APPEND common_libraries ${extra})
-	endif (extra_lib_${extra})
-endforeach (extra)
+	endif ()
+endforeach ()
 
 # Build some unit tests
 include_directories (${PROJECT_SOURCE_DIR})
@@ -43,4 +41,4 @@ foreach (name liberty proto)
 	add_threads (test-${name})
 	target_link_libraries (test-${name} ${common_libraries})
 	add_test (NAME test-${name} COMMAND test-${name})
-endforeach (name)
+endforeach ()

liberty.c

@@ -1749,10 +1749,9 @@ poller_run (struct poller *self)
 	self->revents_len = 0;
 }
 
-#elif defined (BSD)
-
-// Mac OS X's kqueue is fatally broken, or so I've been told; leaving it out.
-// Otherwise this is sort of similar to the epoll version.
+// Sort of similar to the epoll version.  Let's hope Darwin isn't broken,
+// that'd mean reimplementing this in terms of select() just because of Crapple.
+#elif defined (BSD) || defined (__APPLE__)
 
 #include <sys/types.h>
 #include <sys/event.h>
@@ -3247,7 +3246,7 @@ get_xdg_config_dirs (struct strv *out)
 	str_free (&config_home);
 
 	const char *xdg_config_dirs;
-	if (!(xdg_config_dirs = getenv ("XDG_CONFIG_DIRS")))
+	if (!(xdg_config_dirs = getenv ("XDG_CONFIG_DIRS")) || !*xdg_config_dirs)
 		xdg_config_dirs = "/etc/xdg";
 	cstr_split (xdg_config_dirs, ":", true, out);
 }
@@ -3272,7 +3271,7 @@ get_xdg_data_dirs (struct strv *out)
 	str_free (&data_home);
 
 	const char *xdg_data_dirs;
-	if (!(xdg_data_dirs = getenv ("XDG_DATA_DIRS")))
+	if (!(xdg_data_dirs = getenv ("XDG_DATA_DIRS")) || !*xdg_data_dirs)
 		xdg_data_dirs = "/usr/local/share/:/usr/share/";
 	cstr_split (xdg_data_dirs, ":", true, out);
 }
@@ -4713,8 +4712,10 @@ config_item_write_string (struct str *output, const struct str *s)
 		else if (c == '\t')  str_append (output, "\\t");
 		else if (c == '\\')  str_append (output, "\\\\");
 		else if (c == '"')   str_append (output, "\\\"");
-		else if (c < 32)     str_append_printf (output, "\\x%02x", c);
-		else                 str_append_c      (output, c);
+		else if (iscntrl_ascii (c))
+			str_append_printf (output, "\\x%02x", c);
+		else
+			str_append_c (output, c);
 	}
 	str_append_c (output, '"');
 }