mirror of https://github.com/ARMmbed/mbed-os.git
145 lines
5.4 KiB
C++
145 lines
5.4 KiB
C++
/*
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* Copyright (c) 2019, Arm Limited and affiliates.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <cmath>
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#include <cstdarg>
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#include "gtest/gtest.h"
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/* "mbed_printf_implementation.h" does not declare it as extern "C", so pull it in manually */
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extern "C" int mbed_minimal_formatted_string(char *buffer, size_t length, const char *format, va_list arguments, FILE *stream);
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namespace
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{
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std::string format(const char *fmt, ...)
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{
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va_list arguments;
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va_start(arguments, fmt);
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constexpr int buf_size = 128;
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char buffer[buf_size];
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int n = mbed_minimal_formatted_string(buffer, buf_size, fmt, arguments, nullptr);
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va_end(arguments);
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if (n >= buf_size) {
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return "overflow";
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}
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return std::string(buffer);
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}
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}
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TEST(minimal_printf, floats)
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{
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/* std::nextafter is used for the values below to make sure the numbers are
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floating point representations of at least the value we want to test.
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This hopefully mitigates false failures due to different floating point
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implementations */
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/* Positive numbers */
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float value = std::nextafter(1.5f, 0.0f); /* Something like 1.499999, i.e just below 1.5 */
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EXPECT_EQ("1", format("%.0f", value));
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EXPECT_EQ("1.5", format("%.1f", value));
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EXPECT_EQ("1.50", format("%.2f", value));
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EXPECT_EQ("1.500", format("%.3f", value));
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EXPECT_EQ("1.5000", format("%.4f", value));
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EXPECT_EQ("1.50000", format("%.5f", value));
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EXPECT_EQ("1.500000", format("%.6f", value));
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value = std::nextafter(1.5f, 2.0f); /* Something like 1.500001, i.e just above 1.5 */
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EXPECT_EQ("2", format("%.0f", value));
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EXPECT_EQ("1.5", format("%.1f", value));
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EXPECT_EQ("1.50", format("%.2f", value));
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EXPECT_EQ("1.500", format("%.3f", value));
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EXPECT_EQ("1.5000", format("%.4f", value));
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EXPECT_EQ("1.50000", format("%.5f", value));
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EXPECT_EQ("1.500000", format("%.6f", value));
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value = std::nextafter(2.0f, 0.0f); /* Something like 1.999999, i.e just below 2.0 */
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EXPECT_EQ("2", format("%.0f", value));
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EXPECT_EQ("2.0", format("%.1f", value));
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EXPECT_EQ("2.00", format("%.2f", value));
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EXPECT_EQ("2.000", format("%.3f", value));
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EXPECT_EQ("2.0000", format("%.4f", value));
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EXPECT_EQ("2.00000", format("%.5f", value));
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EXPECT_EQ("2.000000", format("%.6f", value));
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/* Negative numbers */
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value = std::nextafter(-1.5f, 0.0f); /* Something like -1.499999, i.e just above -1.5 */
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EXPECT_EQ("-1", format("%.0f", value));
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EXPECT_EQ("-1.5", format("%.1f", value));
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EXPECT_EQ("-1.50", format("%.2f", value));
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EXPECT_EQ("-1.500", format("%.3f", value));
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EXPECT_EQ("-1.5000", format("%.4f", value));
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EXPECT_EQ("-1.50000", format("%.5f", value));
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EXPECT_EQ("-1.500000", format("%.6f", value));
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value = std::nextafter(-1.5f, -2.0f); /* Something like -1.500001, i.e just below -1.5 */
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EXPECT_EQ("-2", format("%.0f", value));
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EXPECT_EQ("-1.5", format("%.1f", value));
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EXPECT_EQ("-1.50", format("%.2f", value));
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EXPECT_EQ("-1.500", format("%.3f", value));
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EXPECT_EQ("-1.5000", format("%.4f", value));
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EXPECT_EQ("-1.50000", format("%.5f", value));
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EXPECT_EQ("-1.500000", format("%.6f", value));
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value = std::nextafter(-2.0f, 0.0f); /* Something like -1.999999, i.e just above -2.0 */
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EXPECT_EQ("-2", format("%.0f", value));
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EXPECT_EQ("-2.0", format("%.1f", value));
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EXPECT_EQ("-2.00", format("%.2f", value));
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EXPECT_EQ("-2.000", format("%.3f", value));
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EXPECT_EQ("-2.0000", format("%.4f", value));
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EXPECT_EQ("-2.00000", format("%.5f", value));
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EXPECT_EQ("-2.000000", format("%.6f", value));
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// And some near zero stuff
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EXPECT_EQ("-0", format("%.0f", std::nextafter(0.0f, -1.0f)));
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EXPECT_EQ("0", format("%.0f", 0.0));
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EXPECT_EQ("0", format("%.0f", std::nextafter(0.0f, 1.0f)));
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}
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TEST(minimal_printf, padding)
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{
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// Right aligned integers
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EXPECT_EQ("12", format("%1d", 12));
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EXPECT_EQ("12", format("%2d", 12));
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EXPECT_EQ(" 12", format("%3d", 12));
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EXPECT_EQ(" 12", format("%4d", 12));
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EXPECT_EQ("-12", format("%1d", -12));
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EXPECT_EQ("-12", format("%3d", -12));
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EXPECT_EQ(" -12", format("%4d", -12));
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EXPECT_EQ(" -12", format("%5d", -12));
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EXPECT_EQ("0012", format("%04d", 12));
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EXPECT_EQ("-012", format("%04d", -12));
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// Right aligned floats
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EXPECT_EQ("12.3", format("%1.1f", 12.345f));
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EXPECT_EQ("12.3", format("%4.1f", 12.345));
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EXPECT_EQ(" 12.3", format("%5.1f", 12.345));
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EXPECT_EQ(" 12.3", format("%6.1f", 12.345));
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EXPECT_EQ("-12.3", format("%1.1f", -12.345f));
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EXPECT_EQ("-12.3", format("%4.1f", -12.345));
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EXPECT_EQ(" -12.3", format("%6.1f", -12.345));
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EXPECT_EQ(" -12.3", format("%7.1f", -12.345));
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EXPECT_EQ("012.3", format("%05.1f", 12.345));
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EXPECT_EQ("-012.3", format("%06.1f", -12.345));
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}
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