--- /dev/null
+/*
+ * dirname.c - return the directory portion of a pathname
+ *
+ * Version: 2008-1.01
+ * Build: c89 -o dirname dirname.c
+ * Source: <http://pdcore.sourceforge.net/>
+ * Spec: <http://www.opengroup.org/onlinepubs/9699919799/utilities/dirname.html>
+ *
+ * This is free and unencumbered software released into the public domain,
+ * provided "as is", without warranty of any kind, express or implied. See the
+ * file UNLICENSE and the website <http://unlicense.org> for further details.
+ */
+
+
+#define _POSIX_SOURCE
+
+#include <locale.h>
+#include <stdio.h>
+
+#define USAGE "usage: dirname string\n"
+
+
+int main(int argc, char **argv)
+{
+ char *head, *tail;
+
+ setlocale (LC_ALL, "");
+
+ if (argc != 2)
+ {
+ fprintf(stderr, USAGE);
+ return(1);
+ }
+
+ head = tail = argv[1];
+ while (*tail)
+ tail++;
+
+ while (tail > head && tail[-1] == '/')
+ tail--;
+ while (tail > head && tail[-1] != '/')
+ tail--;
+ while (tail > head && tail[-1] == '/')
+ tail--;
+
+ if (head == tail)
+ printf(*head == '/' ? "/\n" : ".\n");
+ else
+ printf("%.*s\n", (tail - head), head);
+
+ return(0);
+}