bpo-38600: Change the mark up of NULL in the C API documentation. (GH-16950)

Replace all *NULL* with ``NULL``.

1 files changed, 19 insertions, 19 deletions

diff --git a/Doc/c-api/capsule.rst b/Doc/c-api/capsule.rst
index 3c921bb..78e2114 100644
--- a/Doc/c-api/capsule.rst
+++ b/Doc/c-api/capsule.rst
@@ -40,15 +40,15 @@ Refer to :ref:`using-capsules` for more information on using these objects.
 .. c:function:: PyObject* PyCapsule_New(void *pointer, const char *name, PyCapsule_Destructor destructor)
 
    Create a :c:type:`PyCapsule` encapsulating the *pointer*.  The *pointer*
-   argument may not be *NULL*.
+   argument may not be ``NULL``.
 
-   On failure, set an exception and return *NULL*.
+   On failure, set an exception and return ``NULL``.
 
-   The *name* string may either be *NULL* or a pointer to a valid C string.  If
-   non-*NULL*, this string must outlive the capsule.  (Though it is permitted to
+   The *name* string may either be ``NULL`` or a pointer to a valid C string.  If
+   non-``NULL``, this string must outlive the capsule.  (Though it is permitted to
    free it inside the *destructor*.)
 
-   If the *destructor* argument is not *NULL*, it will be called with the
+   If the *destructor* argument is not ``NULL``, it will be called with the
    capsule as its argument when it is destroyed.
 
    If this capsule will be stored as an attribute of a module, the *name* should
@@ -59,20 +59,20 @@ Refer to :ref:`using-capsules` for more information on using these objects.
 .. c:function:: void* PyCapsule_GetPointer(PyObject *capsule, const char *name)
 
    Retrieve the *pointer* stored in the capsule.  On failure, set an exception
-   and return *NULL*.
+   and return ``NULL``.
 
    The *name* parameter must compare exactly to the name stored in the capsule.
-   If the name stored in the capsule is *NULL*, the *name* passed in must also
-   be *NULL*.  Python uses the C function :c:func:`strcmp` to compare capsule
+   If the name stored in the capsule is ``NULL``, the *name* passed in must also
+   be ``NULL``.  Python uses the C function :c:func:`strcmp` to compare capsule
    names.
 
 
 .. c:function:: PyCapsule_Destructor PyCapsule_GetDestructor(PyObject *capsule)
 
    Return the current destructor stored in the capsule.  On failure, set an
-   exception and return *NULL*.
+   exception and return ``NULL``.
 
-   It is legal for a capsule to have a *NULL* destructor.  This makes a *NULL*
+   It is legal for a capsule to have a ``NULL`` destructor.  This makes a ``NULL``
    return code somewhat ambiguous; use :c:func:`PyCapsule_IsValid` or
    :c:func:`PyErr_Occurred` to disambiguate.
 
@@ -80,9 +80,9 @@ Refer to :ref:`using-capsules` for more information on using these objects.
 .. c:function:: void* PyCapsule_GetContext(PyObject *capsule)
 
    Return the current context stored in the capsule.  On failure, set an
-   exception and return *NULL*.
+   exception and return ``NULL``.
 
-   It is legal for a capsule to have a *NULL* context.  This makes a *NULL*
+   It is legal for a capsule to have a ``NULL`` context.  This makes a ``NULL``
    return code somewhat ambiguous; use :c:func:`PyCapsule_IsValid` or
    :c:func:`PyErr_Occurred` to disambiguate.
 
@@ -90,9 +90,9 @@ Refer to :ref:`using-capsules` for more information on using these objects.
 .. c:function:: const char* PyCapsule_GetName(PyObject *capsule)
 
    Return the current name stored in the capsule.  On failure, set an exception
-   and return *NULL*.
+   and return ``NULL``.
 
-   It is legal for a capsule to have a *NULL* name.  This makes a *NULL* return
+   It is legal for a capsule to have a ``NULL`` name.  This makes a ``NULL`` return
    code somewhat ambiguous; use :c:func:`PyCapsule_IsValid` or
    :c:func:`PyErr_Occurred` to disambiguate.
 
@@ -107,13 +107,13 @@ Refer to :ref:`using-capsules` for more information on using these objects.
    import the module conventionally (using :c:func:`PyImport_ImportModule`).
 
    Return the capsule's internal *pointer* on success.  On failure, set an
-   exception and return *NULL*.
+   exception and return ``NULL``.
 
 
 .. c:function:: int PyCapsule_IsValid(PyObject *capsule, const char *name)
 
    Determines whether or not *capsule* is a valid capsule.  A valid capsule is
-   non-*NULL*, passes :c:func:`PyCapsule_CheckExact`, has a non-*NULL* pointer
+   non-``NULL``, passes :c:func:`PyCapsule_CheckExact`, has a non-``NULL`` pointer
    stored in it, and its internal name matches the *name* parameter.  (See
    :c:func:`PyCapsule_GetPointer` for information on how capsule names are
    compared.)
@@ -142,9 +142,9 @@ Refer to :ref:`using-capsules` for more information on using these objects.
 
 .. c:function:: int PyCapsule_SetName(PyObject *capsule, const char *name)
 
-   Set the name inside *capsule* to *name*.  If non-*NULL*, the name must
+   Set the name inside *capsule* to *name*.  If non-``NULL``, the name must
    outlive the capsule.  If the previous *name* stored in the capsule was not
-   *NULL*, no attempt is made to free it.
+   ``NULL``, no attempt is made to free it.
 
    Return ``0`` on success.  Return nonzero and set an exception on failure.
 
@@ -152,6 +152,6 @@ Refer to :ref:`using-capsules` for more information on using these objects.
 .. c:function:: int PyCapsule_SetPointer(PyObject *capsule, void *pointer)
 
    Set the void pointer inside *capsule* to *pointer*.  The pointer may not be
-   *NULL*.
+   ``NULL``.
 
    Return ``0`` on success.  Return nonzero and set an exception on failure.