Add dirname

src/dirname.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <libgen.h>
+
+int
+main(int argc, char *argv[]) {
+  char *dir;
+  if((dir = dirname(argv[1])) == NULL) {
+    fprintf(stderr, "%s", argv[0]);
+    return 1;
+  }
+  puts(dir);
+  return 0;
+}