1 files changed, 47 insertions, 0 deletions
diff --git a/revpath.c b/revpath.c
new file mode 100644
index 0000000..db88393
--- /dev/null
+++ b/revpath.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright 1999 by The XFree86 Project, Inc.
+ */
+/* $XFree86: xc/config/util/revpath.c,v 1.2 1999/02/01 11:55:49 dawes Exp $ */
+
+/*
+ * Reverse a pathname.  It returns a relative path that can be used to undo
+ * 'cd argv[1]'.
+ *
+ * It is impossible to do this in general, but this handles the cases that
+ * come up in imake.  Maybe imake should use an absolute path for $(TOP)
+ * instead of a relative path so that this problem can be avoided?
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+int
+main(int argc, char *argv[])
+{
+    int levels = 0;
+    char *p;
+
+    /* Silently ignore invalid usage */
+    if (argc != 2)
+	exit(0);
+
+    /* Split the path and count the levels */
+    p = strtok(argv[1], "/");
+    while (p) {
+	if (strcmp(p, ".") == 0)
+	    ;
+	else if (strcmp(p, "..") == 0)
+	    levels--;
+	else
+	    levels++;
+	p = strtok(NULL, "/");
+    }
+
+    while (levels-- > 0)
+	printf("../");
+
+    printf("\n");
+
+    exit(0);
+}