Add Augeas.label

[ocaml-augeas.git] / augeas-c.c

diff --git a/augeas-c.c b/augeas-c.c
index 5dbaa83..ae22dff 100644 (file)
--- a/augeas-c.c
+++ b/augeas-c.c
@@ -44,6 +44,7 @@ extern CAMLprim value ocaml_augeas_defvar (value tv, value namev, value exprv);
 extern CAMLprim value ocaml_augeas_get (value tv, value pathv);
 extern CAMLprim value ocaml_augeas_exists (value tv, value pathv);
 extern CAMLprim value ocaml_augeas_insert (value tv, value beforev, value pathv, value labelv);
+extern CAMLprim value ocaml_augeas_label (value tv, value pathv);
 extern CAMLprim value ocaml_augeas_mv (value tv, value srcv, value destv);
 extern CAMLprim value ocaml_augeas_rm (value tv, value pathv);
 extern CAMLprim value ocaml_augeas_match (value tv, value pathv);
@@ -363,6 +364,32 @@ ocaml_augeas_insert (value tv, value beforev, value pathv, value labelv)
   CAMLreturn (Val_unit);
 }
 
+/* val label : t -> path -> string option */
+CAMLprim value
+ocaml_augeas_label (value tv, value pathv)
+{
+  CAMLparam2 (tv, pathv);
+  CAMLlocal2 (optv, v);
+  augeas_t t = Augeas_t_val (tv);
+  const char *path = String_val (pathv);
+  const char *val;
+  int r;
+
+  r = aug_label (t, path, &val);
+  if (r == 1 && val) {         /* Return Some val */
+    v = caml_copy_string (val);
+    optv = caml_alloc (1, 0);
+    Field (optv, 0) = v;
+  } else if (r == 0 || !val)   /* Return None */
+    optv = Val_int (0);
+  else if (r == -1)            /* Error or multiple matches */
+    raise_error (t, "Augeas.label");
+  else
+    caml_failwith ("Augeas.label: bad return value");
+
+  CAMLreturn (optv);
+}
+
 /* val mv : t -> path -> path -> unit */
 CAMLprim value
 ocaml_augeas_mv (value tv, value srcv, value destv)