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giunioninfo: Mark get_discriminator_type() as nullable

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It may (and should) return `NULL` if called on a union which isn’t
discriminated.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

Helps: #3155
This commit is contained in:
Philip Withnall 2024-02-06 13:35:23 +00:00
parent 11e8075e51
commit e286497c1f
1 changed files with 6 additions and 1 deletions
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7
girepository/giunioninfo.c
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@ -183,7 +183,8 @@ gi_union_info_get_discriminator_offset (GIUnionInfo *info,
*
* Obtain the type information of the union discriminator.
*
* Returns: (transfer full): the [type@GIRepository.TypeInfo], free it with
* Returns: (transfer full) (nullable): the [type@GIRepository.TypeInfo], or
* `NULL` if the union is not discriminated. Free it with
* [method@GIRepository.BaseInfo.unref] when done.
* Since: 2.80
*/
@ -191,6 +192,10 @@ GITypeInfo *
gi_union_info_get_discriminator_type (GIUnionInfo *info)
{
GIRealInfo *rinfo = (GIRealInfo *)info;
UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
if (!blob->discriminated)
return NULL;
return gi_type_info_new ((GIBaseInfo*)info, rinfo->typelib, rinfo->offset + 24);
}