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17b45e684a
This function does not behave as expected when unknown escape sequences are sent to it: - it fails to store (and thus echo) the last character of the invalid sequence - it fails to set esc_len to 0 when it finishes emitting the invalid sequence, meaning that the following character will appear to be part of a new escape sequence - it processes the first character of the rejected sequence as a valid character, just starting the sequence all over again The last two bugs conspire to produce an "impossible condition #876" message which is the main symptom of this behaviour. Fix these bugs and add a test to verify the behaviour. Signed-off-by: Simon Glass <sjg@chromium.org> Reported-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
// 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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#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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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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cli_ch_init(cch);
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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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/* 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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/* 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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* 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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/* 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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/* 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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return 0;
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}
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COMMON_TEST(cli_ch_test, 0);
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