[libglnx] Add glnx_basename()

[Colin Walters <walters src gnome org>]

commit 175502e5bee236123d27adf4be01e8ba8fe2b178
Author: Colin Walters <walters verbum org>
Date:   Thu Mar 5 09:02:48 2015 -0500

    Add glnx_basename()
    
    We have to wrap the glibc version to ensure we get the right version,
    otherwise depending on the variance of includes we may end up crashing
    if we get the POSIX version.

 glnx-fdio.h |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/glnx-fdio.h b/glnx-fdio.h
index 688eeb2..19f938c 100644
--- a/glnx-fdio.h
+++ b/glnx-fdio.h
@@ -26,9 +26,24 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <attr/xattr.h>
+/* From systemd/src/shared/util.h */
+/* When we include libgen.h because we need dirname() we immediately
+ * undefine basename() since libgen.h defines it as a macro to the XDG
+ * version which is really broken. */
+#include <libgen.h>
+#undef basename
 
 G_BEGIN_DECLS
 
+/* Irritatingly, g_basename() which is what we want
+ * is deprecated.
+ */
+static inline
+const char *glnx_basename (const char *path)
+{
+  return (basename) (path);
+}
+
 GBytes *
 glnx_fd_readall_bytes (int               fd,
                        GCancellable     *cancellable,