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Add etl::format (#1204)

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* Synchronize on C++ 17 for "Windows - STL" and "Windows - No STL"

MSVC C++20 handles char* differently on iteration

* Add etl::format

This adds etl::format, guided by std::format, avoiding dynamic memory
allocation
This commit is contained in:
Roland Reichwein 2025-12-13 09:09:03 +01:00 committed by John Wellbelove
parent 6f11b19cfa
commit ca16876ea0
7 changed files with 2937 additions and 1 deletions
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2
.github/workflows/msvc.yml vendored
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@ -22,7 +22,7 @@ jobs:
- name: Build
run: |
cmake -G "Visual Studio 17 2022" -AWin32 -DBUILD_TESTS=ON -DNO_STL=OFF -DETL_USE_TYPE_TRAITS_BUILTINS=OFF -DETL_USER_DEFINED_TYPE_TRAITS=OFF -DETL_FORCE_TEST_CPP03_IMPLEMENTATION=OFF -DETL_CXX_STANDARD=20 ./
cmake -G "Visual Studio 17 2022" -AWin32 -DBUILD_TESTS=ON -DNO_STL=OFF -DETL_USE_TYPE_TRAITS_BUILTINS=OFF -DETL_USER_DEFINED_TYPE_TRAITS=OFF -DETL_FORCE_TEST_CPP03_IMPLEMENTATION=OFF -DETL_CXX_STANDARD=17 ./
MSBuild.exe -version
MSBuild.exe .\etl.sln

1
include/etl/file_error_numbers.h
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@ -109,4 +109,5 @@ SOFTWARE.
#define ETL_ALGORITHM_FILE_ID "76"
#define ETL_NOT_NULL_FILE_ID "77"
#define ETL_SIGNAL_FILE_ID "78"
#define ETL_FORMAT_FILE_ID "79"
#endif

2244
include/etl/format.h Normal file
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File diff suppressed because it is too large Load Diff

117
include/etl/print.h Normal file
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@ -0,0 +1,117 @@
///\file
/******************************************************************************
The MIT License(MIT)
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
Copyright(c) 2025 BMW AG
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/
#ifndef ETL_PRINT_INCLUDED
#define ETL_PRINT_INCLUDED
#include "platform.h"
#include "format.h"
#if ETL_USING_CPP11
// to be implemented in a concrete project, typically printing to a serial console
// type int here is the convention from putchar(), actually storing char
extern "C" void etl_putchar(int c);
namespace etl
{
namespace private_print
{
using char_type = etl::private_format::char_type;
// No-op iterator that forwards all assignments to etl_putchar
class print_iterator
{
public:
class print_to
{
public:
print_to& operator=(char_type c)
{
etl_putchar(static_cast<int>(c));
return *this;
}
};
print_iterator()
{
}
print_iterator(const print_iterator&)
{
}
print_iterator& operator=(const print_iterator&)
{
return *this;
}
print_to operator*()
{
return print_to();
}
print_iterator& operator++()
{
return *this;
}
print_iterator operator++(int)
{
return *this;
}
};
} // namespace private_print
template <class... Args>
void print(etl::format_string<Args...> fmt, Args&&... args)
{
private_print::print_iterator it;
(void)format_to(it, etl::move(fmt), etl::forward<Args>(args)...);
}
inline void println()
{
etl_putchar(static_cast<int>('\n'));
}
template <class... Args>
void println(etl::format_string<Args...> fmt, Args&&... args)
{
private_print::print_iterator it;
(void)format_to(it, etl::move(fmt), etl::forward<Args>(args)...);
println();
}
} // namespace etl
#endif
#endif

2
test/CMakeLists.txt
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@ -183,6 +183,7 @@ add_executable(etl_tests
test_flat_multiset.cpp
test_flat_set.cpp
test_fnv_1.cpp
test_format.cpp
test_format_spec.cpp
test_forward_list.cpp
test_forward_list_shared_pool.cpp
@ -258,6 +259,7 @@ add_executable(etl_tests
test_poly_span_fixed_extent.cpp
test_pool.cpp
test_pool_external_buffer.cpp
test_print.cpp
test_priority_queue.cpp
test_pseudo_moving_average.cpp
test_quantize.cpp

490
test/test_format.cpp Normal file
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@ -0,0 +1,490 @@
/******************************************************************************
The MIT License(MIT)
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
Copyright(c) 2025 BMW AG
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/
#include "unit_test_framework.h"
#include "etl/format.h"
#include "etl/iterator.h"
#if ETL_USING_CPP11
namespace
{
using iterator = etl::back_insert_iterator<etl::istring>;
template<class... Args>
etl::istring& test_format(etl::istring& s, etl::format_string<Args...> fmt, Args&&... args)
{
(void) etl::format_to(s, fmt, etl::forward<Args>(args)...);
return s;
}
SUITE(test_format)
{
//*************************************************************************
TEST(test_empty)
{
etl::string<100> s;
const char* result = etl::format_to(s, "");
CHECK_EQUAL(s.cbegin(), result);
CHECK_EQUAL("", s);
}
//*************************************************************************
TEST(test_format)
{
etl::string<100> s;
const char* result = etl::format_to(s, "abc");
CHECK_EQUAL(s.cbegin() + 3, result);
CHECK_EQUAL("abc", s);
}
//*************************************************************************
TEST(test_format_int)
{
etl::string<100> s;
CHECK_EQUAL("1", test_format(s, "{}", 1));
CHECK_EQUAL("123", test_format(s, "{}", 123));
CHECK_EQUAL("4123", test_format(s, "{}", 4123));
CHECK_EQUAL("1048962123", test_format(s, "{}", 1048962123));
CHECK_EQUAL("1 2", test_format(s, "{} {}", 1, 2));
CHECK_EQUAL("-123", test_format(s, "{}", -123));
CHECK_EQUAL("-314748364", test_format(s, "{}", (int)-314748364));
CHECK_EQUAL("2147483647", test_format(s, "{}", (int)2147483647));
CHECK_EQUAL("-2147483648", test_format(s, "{}", (int)-2147483648));
CHECK_EQUAL("0", test_format(s, "{}", 0));
CHECK_EQUAL("-1", test_format(s, "{}", -1));
}
//*************************************************************************
TEST(test_format_unsigned_int)
{
etl::string<100> s;
CHECK_EQUAL("0", test_format(s, "{}", static_cast<unsigned int>(0U)));
CHECK_EQUAL("1", test_format(s, "{}", static_cast<unsigned int>(1U)));
CHECK_EQUAL("12345678", test_format(s, "{}", static_cast<unsigned int>(12345678U)));
CHECK_EQUAL("4123456780", test_format(s, "{}", static_cast<unsigned int>(4123456780U)));
}
//*************************************************************************
TEST(test_format_long_long_int)
{
etl::string<100> s;
CHECK_EQUAL("-1", test_format(s, "{}", static_cast<long long int>(-1LL)));
CHECK_EQUAL("0", test_format(s, "{}", static_cast<long long int>(0LL)));
CHECK_EQUAL("1", test_format(s, "{}", static_cast<long long int>(1LL)));
CHECK_EQUAL("-12345678", test_format(s, "{}", static_cast<long long int>(-12345678LL)));
CHECK_EQUAL("-4123456780", test_format(s, "{}", static_cast<long long int>(-4123456780LL)));
CHECK_EQUAL("-123456781234", test_format(s, "{}", static_cast<long long int>(-123456781234LL)));
CHECK_EQUAL("-412345678012", test_format(s, "{}", static_cast<long long int>(-412345678012LL)));
CHECK_EQUAL("12345678", test_format(s, "{}", static_cast<long long int>(12345678LL)));
CHECK_EQUAL("4123456780", test_format(s, "{}", static_cast<long long int>(4123456780LL)));
}
//*************************************************************************
TEST(test_format_unsigned_long_long_int)
{
etl::string<100> s;
CHECK_EQUAL("0", test_format(s, "{}", static_cast<unsigned long long int>(0LL)));
CHECK_EQUAL("1", test_format(s, "{}", static_cast<unsigned long long int>(1LL)));
CHECK_EQUAL("12345678", test_format(s, "{}", static_cast<unsigned long long int>(12345678LL)));
CHECK_EQUAL("4123456780", test_format(s, "{}", static_cast<unsigned long long int>(4123456780LL)));
CHECK_EQUAL("18446744073709551615", test_format(s, "{}", static_cast<unsigned long long int>(18446744073709551615ULL)));
CHECK_EQUAL("1311768467463790320", test_format(s, "{}", static_cast<unsigned long long int>(0x123456789ABCDEF0ULL)));
}
//*************************************************************************
TEST(test_format_other_int)
{
etl::string<100> s;
CHECK_EQUAL("34", test_format(s, "{}", static_cast<uint8_t>(34)));
CHECK_EQUAL("-14", test_format(s, "{}", static_cast<int8_t>(-14)));
CHECK_EQUAL("6534", test_format(s, "{}", static_cast<uint16_t>(6534)));
CHECK_EQUAL("-9414", test_format(s, "{}", static_cast<int16_t>(-9414)));
CHECK_EQUAL("236534", test_format(s, "{}", static_cast<uint32_t>(236534)));
CHECK_EQUAL("-6759414", test_format(s, "{}", static_cast<int32_t>(-6759414)));
}
//*************************************************************************
TEST(test_format_float)
{
etl::string<100> s;
CHECK_EQUAL("1.0", test_format(s, "{}", 1.0f));
CHECK_EQUAL("1.234567", test_format(s, "{}", 1.234567f));
CHECK_EQUAL("1.234567", test_format(s, "{}", 1.2345678f));
CHECK_EQUAL("1.125", test_format(s, "{}", 1.125f));
}
//*************************************************************************
TEST(test_format_double)
{
etl::string<100> s;
CHECK_EQUAL("1.0", test_format(s, "{}", 1.0));
CHECK_EQUAL("1.234564", test_format(s, "{}", 1.234564));
CHECK_EQUAL("1.234567", test_format(s, "{}", 1.2345678));
CHECK_EQUAL("1.5", test_format(s, "{}", 1.5));
}
//*************************************************************************
TEST(test_format_long_double)
{
etl::string<100> s;
CHECK_EQUAL("1.0", test_format(s, "{}", 1.0l));
auto& result = test_format(s, "{}", 1.234567l);
CHECK("1.234567" == result || "1.234566" == result);
CHECK_EQUAL("1.234567", test_format(s, "{}", 1.2345678l));
CHECK_EQUAL("1.25", test_format(s, "{}", 1.25l));
}
//*************************************************************************
TEST(test_format_float_presentation)
{
etl::string<100> s;
CHECK_EQUAL("1.000000e+00", test_format(s, "{:e}", 1.0f));
CHECK_EQUAL("1.125000E+00", test_format(s, "{:E}", 1.125f));
CHECK_EQUAL("-2.533324e-05", test_format(s, "{:e}", -0.00002533324f));
CHECK_EQUAL("-2.500000e+11", test_format(s, "{:e}", -250000000000.0f));
CHECK_EQUAL("1.000000", test_format(s, "{:f}", 1.0f));
CHECK_EQUAL("1.125000", test_format(s, "{:F}", 1.125f));
CHECK_EQUAL("1.000000", test_format(s, "{:g}", 1.0f));
CHECK_EQUAL("1.125000", test_format(s, "{:G}", 1.125f));
CHECK_EQUAL("1.000000e+10", test_format(s, "{:g}", 10000000000.0f));
CHECK_EQUAL("1.000000E+10", test_format(s, "{:G}", 10000000000.0f));
CHECK_EQUAL("nan", test_format(s, "{}", NAN));
CHECK_EQUAL("nan", test_format(s, "{:e}", NAN));
CHECK_EQUAL("NAN", test_format(s, "{:E}", NAN));
CHECK_EQUAL("nan", test_format(s, "{:f}", NAN));
CHECK_EQUAL("NAN", test_format(s, "{:F}", NAN));
CHECK_EQUAL("nan", test_format(s, "{:g}", NAN));
CHECK_EQUAL("NAN", test_format(s, "{:0.3G}", NAN));
CHECK_EQUAL("inf", test_format(s, "{}", INFINITY));
CHECK_EQUAL("inf", test_format(s, "{:e}", INFINITY));
CHECK_EQUAL("INF", test_format(s, "{:E}", INFINITY));
CHECK_EQUAL("inf", test_format(s, "{:f}", INFINITY));
CHECK_EQUAL("INF", test_format(s, "{:F}", INFINITY));
CHECK_EQUAL("inf", test_format(s, "{:g}", INFINITY));
CHECK_EQUAL("INF", test_format(s, "{:0.3G}", INFINITY));
CHECK_EQUAL("0x1.8p+0", test_format(s, "{:a}", 1.5f));
CHECK_EQUAL("0X1.4CCCCCCCCCP+0", test_format(s, "{:A}", 1.3l));
CHECK_EQUAL("0x2.49fp+4", test_format(s, "{:a}", 150000.0));
CHECK_EQUAL("0x1.92a738p-5", test_format(s, "{:a}", 0.0000015f));
CHECK_EQUAL("0x1.6345785d8ap+e", test_format(s, "{:a}", 100000000000000000.l));
}
//*************************************************************************
TEST(test_format_char_array)
{
etl::string<100> s;
CHECK_EQUAL("s", test_format(s, "{}", "s"));
CHECK_EQUAL("abcd", test_format(s, "{}", "abcd"));
}
//*************************************************************************
TEST(test_format_char)
{
etl::string<100> s;
CHECK_EQUAL("a s b", test_format(s, "a {} b", 's'));
CHECK_EQUAL("a s b", test_format(s, "a {:c} b", 's'));
CHECK_EQUAL("a 's' b", test_format(s, "a {:?} b", 's'));
CHECK_EQUAL("a \t b", test_format(s, "a {} b", '\t'));
CHECK_EQUAL("a '\\t' b", test_format(s, "a {:?} b", '\t'));
CHECK_EQUAL("a '\\n' b", test_format(s, "a {:?} b", '\n'));
CHECK_EQUAL("a '\\r' b", test_format(s, "a {:?} b", '\r'));
CHECK_EQUAL("a '\\\"' b", test_format(s, "a {:?} b", '"'));
CHECK_EQUAL("a '\\'' b", test_format(s, "a {:?} b", '\''));
CHECK_EQUAL("a '\\\\' b", test_format(s, "a {:?} b", '\\'));
CHECK_EQUAL("a '\\\\' b", test_format(s, "a {:?} b", '\\'));
CHECK_EQUAL("a 97 b", test_format(s, "a {:d} b", 'a'));
CHECK_EQUAL("a 61 b", test_format(s, "a {:X} b", 'a'));
CHECK_EQUAL("a 61 b", test_format(s, "a {:x} b", 'a'));
CHECK_EQUAL("a 0x61 b", test_format(s, "a {:#x} b", 'a'));
}
//*************************************************************************
TEST(test_format_bool)
{
etl::string<100> s;
CHECK_EQUAL("1false2true3", test_format(s, "1{}2{}3", false, true));
CHECK_EQUAL("true", test_format(s, "{:s}", true));
CHECK_EQUAL("1", test_format(s, "{:d}", true));
CHECK_EQUAL("1", test_format(s, "{:X}", true));
CHECK_EQUAL("01", test_format(s, "{:#o}", true));
CHECK_EQUAL(" true", test_format(s, "{:10}", true));
}
//*************************************************************************
TEST(test_format_string_view)
{
etl::string<100> s;
etl::string_view sv("data1");
CHECK_EQUAL("data1", test_format(s, "{}", sv));
CHECK_EQUAL("data1", test_format(s, "{:s}", sv));
CHECK_THROW(test_format(s, "{:d}", sv), etl::bad_format_string_exception);
CHECK_EQUAL("data1 ", test_format(s, "{:10s}", sv));
CHECK_EQUAL("data1 ", test_format(s, "{:<10s}", sv));
CHECK_EQUAL(" data1", test_format(s, "{:>10s}", sv));
CHECK_EQUAL(" data1 ", test_format(s, "{:^10s}", sv));
CHECK_EQUAL("data1", test_format(s, "{:3}", sv));
CHECK_EQUAL("dat", test_format(s, "{:.3s}", sv));
CHECK_EQUAL("dat", test_format(s, "{:^.3s}", sv));
CHECK_EQUAL(". dat !", test_format(s, ".{:^8.3s}!", sv));
CHECK_EQUAL("^dat $", test_format(s, "^{:8.3s}$", sv));
}
//*************************************************************************
TEST(test_format_string_view_escaped)
{
etl::string<100> s;
etl::string_view sv("data1\n");
CHECK_EQUAL("\"data1\\n\"", test_format(s, "{:?}", sv));
}
//*************************************************************************
TEST(test_format_chars)
{
etl::string<100> s;
const char* chars = "data1";
CHECK_EQUAL("data1", test_format(s, "{}", chars));
CHECK_EQUAL("data1", test_format(s, "{:s}", chars));
CHECK_THROW(test_format(s, "{:d}", chars), etl::bad_format_string_exception);
CHECK_EQUAL("data1 ", test_format(s, "{:10s}", chars));
CHECK_EQUAL("data1 ", test_format(s, "{:<10s}", chars));
CHECK_EQUAL(" data1", test_format(s, "{:>10s}", chars));
CHECK_EQUAL(" data1 ", test_format(s, "{:^10s}", chars));
CHECK_EQUAL("data1", test_format(s, "{:3}", chars));
CHECK_EQUAL("dat", test_format(s, "{:.3s}", chars));
CHECK_EQUAL("dat", test_format(s, "{:^.3s}", chars));
CHECK_EQUAL(". dat !", test_format(s, ".{:^8.3s}!", chars));
CHECK_EQUAL("^dat $", test_format(s, "^{:8.3s}$", chars));
}
//*************************************************************************
TEST(test_format_chars_escaped)
{
etl::string<100> s;
const char* chars = "data2\n";
CHECK_EQUAL("\"data2\\n\"", test_format(s, "{:?}", chars));
}
//*************************************************************************
TEST(test_format_pointer)
{
etl::string<100> s;
void* p = nullptr;
CHECK_EQUAL("0x0", test_format(s, "{}", p));
CHECK_EQUAL("0x0", test_format(s, "{:p}", p));
CHECK_EQUAL("0X0", test_format(s, "{:P}", p));
if (sizeof(uintptr_t) == 8)
{
p = reinterpret_cast<void*>(0x123456789abcdef0ULL);
CHECK_EQUAL("0x123456789abcdef0", test_format(s, "{:p}", p));
CHECK_EQUAL("0X123456789ABCDEF0", test_format(s, "{:P}", p));
}
else if (sizeof(uintptr_t) == 4)
{
p = reinterpret_cast<void*>(0x1abcdef0ULL);
CHECK_EQUAL("0x1abcdef0", test_format(s, "{:p}", p));
CHECK_EQUAL("0X1ABCDEF0", test_format(s, "{:P}", p));
}
}
//*************************************************************************
TEST(test_format_limit)
{
etl::string<10> s;
CHECK_EQUAL("abcdefghij", test_format(s, "abcdefghijkl"));
CHECK_EQUAL("abcdefgh12", test_format(s, "abcdefgh{}", 123));
}
//*************************************************************************
TEST(test_format_escape)
{
etl::string<100> s;
CHECK_EQUAL("abc{def", test_format(s, "abc{{def"));
CHECK_EQUAL("}abc", test_format(s, "}}abc"));
}
//*************************************************************************
TEST(test_format_invalid)
{
etl::string<100> s;
CHECK_THROW(test_format(s, "a{b}", 1), etl::bad_format_string_exception); // bad format index spec
// goal: rejected at compile time on C++20, error on <= C++17
CHECK_THROW(test_format(s, "a{b"), etl::bad_format_string_exception); // closing brace missing
// goal: rejected at compile time on C++20, error on <= C++17
CHECK_THROW(test_format(s, "a{b}"), etl::bad_format_string_exception); // arg missing
// goal: rejected at compile time on C++20, error on <= C++17
CHECK_THROW(test_format(s, "a}b"), etl::bad_format_string_exception); // bad format: only escaped }} allowed
// goal: rejected at compile time on C++20, error on <= C++17
CHECK_EQUAL("123", test_format(s, "{:}", 123)); // valid
CHECK_THROW(test_format(s, "{::}", 123), etl::bad_format_string_exception); // bad format spec
CHECK_THROW(test_format(s, "{1}", 123), etl::bad_format_string_exception); // bad index
}
//*************************************************************************
TEST(test_format_indexed)
{
etl::string<100> s;
CHECK_EQUAL("34 56", test_format(s, "{0} {1}", 34, 56));
CHECK_EQUAL("56 34", test_format(s, "{1} {0}", 34, 56));
CHECK_EQUAL("134 134", test_format(s, "{0} {0}", 134));
CHECK_EQUAL("a b c d e f g h i j k l m n", test_format(s, "{0} {1} {2} {3} {4} {5} {6} {7} {8} {9} {10} {11} {12} {13}", 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n'));
}
//*************************************************************************
TEST(test_formatted_size)
{
CHECK_EQUAL(0, etl::formatted_size(""));
CHECK_EQUAL(0, etl::formatted_size("{}", ""));
CHECK_EQUAL(5, etl::formatted_size("xyz{}", 12));
CHECK_EQUAL(3, etl::formatted_size("{}", "abc"));
}
//*************************************************************************
TEST(test_iterator)
{
etl::string<100> s;
etl::istring::iterator result = etl::format_to(s.begin(), "{0} {1}", 34, 56);
s.uninitialized_resize(result - s.begin());
CHECK_EQUAL("34 56", s);
s.clear();
etl::format_to(iterator(s), "");
CHECK_EQUAL("", s);
s.clear();
etl::format_to(iterator(s), "{0} {1}", 65, 34);
CHECK_EQUAL("65 34", s);
s = "abcdefghij";
etl::format_to_n(s.begin(), 3, "xy{}", 123);
CHECK_EQUAL("xy1defghij", s);
}
//*************************************************************************
TEST(test_format_spec_fill_and_align)
{
etl::string<100> s;
CHECK_EQUAL("a 34", test_format(s, "a{:5}", 34));
CHECK_EQUAL("a34", test_format(s, "a{:1}", 34));
CHECK_EQUAL("a34", test_format(s, "a{:2}", 34));
CHECK_EQUAL(" 34", test_format(s, "{:>4}", 34));
CHECK_EQUAL(" 34 ", test_format(s, "{:^4}", 34));
CHECK_EQUAL(" 34 ", test_format(s, "{:^5}", 34));
CHECK_EQUAL(" -65 ", test_format(s, "{:^5}", -65));
CHECK_EQUAL("34 ", test_format(s, "{:<4}", 34));
CHECK_THROW(test_format(s, "a{:*5}", 34), etl::bad_format_string_exception);
CHECK_EQUAL("a*34**", test_format(s, "a{:*^5}", 34));
CHECK_EQUAL("a*34**", test_format(s, "a{:*^5}", static_cast<unsigned int>(34)));
CHECK_EQUAL("a***-341234567890****", test_format(s, "a{:*^20}", static_cast<long long int>(-341234567890)));
CHECK_EQUAL("a****341234567890****", test_format(s, "a{:*^20}", static_cast<unsigned long long int>(341234567890)));
CHECK_EQUAL(" x ", test_format(s, "{: ^20}", 'x'));
CHECK_EQUAL("x ", test_format(s, "{:20}", 'x'));
CHECK_EQUAL(" x", test_format(s, "{:>20}", 'x'));
CHECK_EQUAL("x ", test_format(s, "{:<20}", 'x'));
}
//*************************************************************************
TEST(test_format_spec_sign)
{
etl::string<100> s;
CHECK_EQUAL("34", test_format(s, "{:-}", 34));
CHECK_EQUAL("-34", test_format(s, "{:-}", -34));
CHECK_EQUAL("-34", test_format(s, "{:+}", -34));
CHECK_EQUAL("+34", test_format(s, "{:+}", 34));
CHECK_EQUAL("+0", test_format(s, "{:+}", 0));
CHECK_EQUAL("0", test_format(s, "{:-}", 0));
CHECK_EQUAL("210", test_format(s, "{:-}", 210));
CHECK_EQUAL("-210", test_format(s, "{:-}", -210));
CHECK_EQUAL(" 0", test_format(s, "{: }", 0));
CHECK_EQUAL(" 546", test_format(s, "{: }", 546));
CHECK_EQUAL("-546", test_format(s, "{: }", -546));
}
//*************************************************************************
TEST(test_format_int_presentation)
{
etl::string<100> s;
CHECK_EQUAL("134", test_format(s, "{:d}", 134));
CHECK_EQUAL("3f4", test_format(s, "{:x}", 0x3f4));
CHECK_EQUAL("123456789abcdef0", test_format(s, "{:x}", 0x123456789abcdef0ULL));
CHECK_EQUAL("0x3f4", test_format(s, "{:#x}", 0x3f4));
CHECK_EQUAL("3F4", test_format(s, "{:X}", 0x3f4));
CHECK_EQUAL("0X3F4", test_format(s, "{:#X}", 0x3f4));
CHECK_EQUAL("34", test_format(s, "{:o}", 034));
CHECK_EQUAL("034", test_format(s, "{:#o}", 034));
CHECK_EQUAL("1010", test_format(s, "{:b}", 0b1010));
CHECK_EQUAL("0b1010", test_format(s, "{:#b}", 0b1010));
CHECK_EQUAL("1010", test_format(s, "{:B}", 0b1010));
CHECK_EQUAL("0B1010", test_format(s, "{:#B}", 0b1010));
CHECK_EQUAL("-0B1010", test_format(s, "{:#B}", -0b1010));
CHECK_EQUAL("C", test_format(s, "{:c}", 67));
CHECK_EQUAL("00067", test_format(s, "{:05d}", 67));
CHECK_EQUAL("+00067", test_format(s, "{:+05d}", 67));
CHECK_EQUAL("+0X00EF1", test_format(s, "{:+#05X}", 0xEF1));
CHECK_THROW(test_format(s, "{:+#05.5X}", 0xEF1), etl::bad_format_string_exception);
}
}
}
#endif

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/******************************************************************************
The MIT License(MIT)
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
Copyright(c) 2025 BMW AG
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/
#include "unit_test_framework.h"
#include "etl/print.h"
#if ETL_USING_CPP11
namespace {
using iterator = etl::back_insert_iterator<etl::istring>;
etl::string<100> output;
}
// to be implemented in a concrete project, typically printing to a serial console
extern "C" void etl_putchar(int c)
{
iterator output_it(output);
*output_it = static_cast<etl::private_print::char_type>(c);
}
namespace
{
SUITE(test_format)
{
//*************************************************************************
TEST(test_print)
{
output.clear();
etl::print("Hello Print!");
CHECK_EQUAL("Hello Print!", output);
output.clear();
etl::print("{}", "Hello format!");
CHECK_EQUAL("Hello format!", output);
output.clear();
etl::print("Hello {}!", 321);
CHECK_EQUAL("Hello 321!", output);
}
//*************************************************************************
TEST(test_println)
{
output.clear();
etl::println("Hello Println!");
CHECK_EQUAL("Hello Println!\n", output);
output.clear();
etl::println();
CHECK_EQUAL("\n", output);
}
}
}
#endif