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@@ -0,0 +1,48 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Copyright 2023 Google LLC
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+ */
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+
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+#include <common.h>
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+#include <cli.h>
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+#include <test/common.h>
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+#include <test/test.h>
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+#include <test/ut.h>
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+
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+static int cli_ch_test(struct unit_test_state *uts)
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+{
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+ struct cli_ch_state s_cch, *cch = &s_cch;
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+
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+ cli_ch_init(cch);
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+
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+ /* should be nothing to return at first */
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+ ut_asserteq(0, cli_ch_process(cch, 0));
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+
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+ /* check normal entry */
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+ ut_asserteq('a', cli_ch_process(cch, 'a'));
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+ ut_asserteq('b', cli_ch_process(cch, 'b'));
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+ ut_asserteq('c', cli_ch_process(cch, 'c'));
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+ ut_asserteq(0, cli_ch_process(cch, 0));
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+
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+ /* send an invalid escape sequence */
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+ ut_asserteq(0, cli_ch_process(cch, '\e'));
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+ ut_asserteq(0, cli_ch_process(cch, '['));
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+
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+ /*
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+ * with the next char it sees that the sequence is invalid, so starts
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+ * emitting it
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+ */
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+ ut_asserteq('\e', cli_ch_process(cch, 'X'));
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+
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+ /* now we set 0 bytes to empty the buffer */
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+ ut_asserteq('[', cli_ch_process(cch, 0));
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+ ut_asserteq('X', cli_ch_process(cch, 0));
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+ ut_asserteq(0, cli_ch_process(cch, 0));
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+
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+ /* things are normal again */
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+ ut_asserteq('a', cli_ch_process(cch, 'a'));
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+ ut_asserteq(0, cli_ch_process(cch, 0));
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+
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+ return 0;
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+}
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+COMMON_TEST(cli_ch_test, 0);
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