doc-rst:c-domain: ref-name of a function declaration

Add option 'name' to the "c:function:" directive.  With option 'name'
the ref-name of a function can be modified. E.g.::

    .. c:function:: int ioctl( int fd, int request )
       :name: VIDIOC_LOG_STATUS

The func-name (e.g. ioctl) remains in the output but the ref-name
changed from ``ioctl`` to ``VIDIOC_LOG_STATUS``. The index entry for
this function is also changed to ``VIDIOC_LOG_STATUS`` and the function
can now referenced by::

    :c:func:`VIDIOC_LOG_STATUS`

Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

1 files changed, 31 insertions, 0 deletions

diff --git a/Documentation/sphinx/cdomain.py b/Documentation/sphinx/cdomain.py
index d6e66e2..b1912c80 100644
--- a/Documentation/sphinx/cdomain.py
+++ b/Documentation/sphinx/cdomain.py
@@ -7,8 +7,24 @@ u"""
 
     :copyright:  Copyright (C) 2016  Markus Heiser
     :license:    GPL Version 2, June 1991 see Linux/COPYING for details.
+
+    List of customizations:
+
+    * Add option 'name' to the "c:function:" directive.  With option 'name' the
+      ref-name of a function can be modified. E.g.::
+
+          .. c:function:: int ioctl( int fd, int request )
+             :name: VIDIOC_LOG_STATUS
+
+      The func-name (e.g. ioctl) remains in the output but the ref-name changed
+      from 'ioctl' to 'VIDIOC_LOG_STATUS'. The function is referenced by::
+
+          * :c:func:`VIDIOC_LOG_STATUS` or
+          * :any:`VIDIOC_LOG_STATUS` (``:any:`` needs sphinx 1.3)
 """
 
+from docutils.parsers.rst import directives
+
 from sphinx.domains.c import CObject as Base_CObject
 from sphinx.domains.c import CDomain as Base_CDomain
 
@@ -29,6 +45,21 @@ class CObject(Base_CObject):
     """
     Description of a C language object.
     """
+    option_spec = {
+        "name" : directives.unchanged
+    }
+
+    def handle_signature(self, sig, signode):
+        """Transform a C signature into RST nodes."""
+        fullname = super(CObject, self).handle_signature(sig, signode)
+        if "name" in self.options:
+            if self.objtype == 'function':
+                fullname = self.options["name"]
+            else:
+                # FIXME: handle :name: value of other declaration types?
+                pass
+        return fullname
+
 
 class CDomain(Base_CDomain):