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From 9902e2c4224914dc611eb2326db7322aa57ec2a2 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Marco=20Trevisan=20=28Trevi=C3=B1o=29?= <mail@3v1n0.net>
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Date: Wed, 27 Nov 2019 19:36:24 +0100
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Subject: [PATCH 030/181] fpi-ssm: Add a usb transfer callback with data as
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weak pointer
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Allow to pass a double-pointer to be nullified as the transfer data in order
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to mark it as NULL when the transfer is done.
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This is useful if we're keeping the transfer around in order to check that
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no one is currently running.
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---
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libfprint/fpi-ssm.c | 29 +++++++++++++++++++++++++++++
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libfprint/fpi-ssm.h | 6 +++++-
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2 files changed, 34 insertions(+), 1 deletion(-)
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diff --git a/libfprint/fpi-ssm.c b/libfprint/fpi-ssm.c
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index a614860..6a02a2c 100644
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--- a/libfprint/fpi-ssm.c
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+++ b/libfprint/fpi-ssm.c
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@@ -413,3 +413,32 @@ fpi_ssm_usb_transfer_cb (FpiUsbTransfer *transfer, FpDevice *device,
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else
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fpi_ssm_next_state (transfer->ssm);
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}
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+
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+/**
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+ * fpi_ssm_usb_transfer_with_weak_pointer_cb:
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+ * @transfer: a #FpiUsbTransfer
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+ * @device: a #FpDevice
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+ * @weak_ptr: A #gpointer pointer to nullify. You can pass a pointer to any
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+ * #gpointer to nullify when the callback is completed. I.e a
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+ * pointer to the current #FpiUsbTransfer.
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+ * @error: The #GError or %NULL
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+ *
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+ * Can be used in as a #FpiUsbTransfer callback handler to automatically
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+ * advance or fail a statemachine on transfer completion.
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+ * Passing a #gpointer* as @weak_ptr permits to nullify it once we're done
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+ * with the transfer.
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+ *
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+ * Make sure to set the #FpiSsm on the transfer.
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+ */
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+void
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+fpi_ssm_usb_transfer_with_weak_pointer_cb (FpiUsbTransfer *transfer,
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+ FpDevice *device, gpointer weak_ptr,
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+ GError *error)
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+{
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+ g_return_if_fail (transfer->ssm);
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+
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+ if (weak_ptr)
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+ g_nullify_pointer ((gpointer *) weak_ptr);
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+
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+ fpi_ssm_usb_transfer_cb (transfer, device, weak_ptr, error);
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+}
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diff --git a/libfprint/fpi-ssm.h b/libfprint/fpi-ssm.h
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index 8d45162..704271d 100644
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--- a/libfprint/fpi-ssm.h
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+++ b/libfprint/fpi-ssm.h
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@@ -91,5 +91,9 @@ void fpi_ssm_next_state_timeout_cb (FpDevice *dev,
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void *data);
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void fpi_ssm_usb_transfer_cb (FpiUsbTransfer *transfer,
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FpDevice *device,
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- gpointer user_data,
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+ gpointer user_date,
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GError *error);
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+void fpi_ssm_usb_transfer_with_weak_pointer_cb (FpiUsbTransfer *transfer,
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+ FpDevice *device,
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+ gpointer weak_ptr,
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+ GError *error);
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--
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2.24.1
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