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e2e7c4d574
In a bunch of cases, this actually ends up simplifying the code as
to_number will handle something such as:
```
Optional<I> opt;
if constexpr (IsSigned<I>)
opt = view.to_int<I>();
else
opt = view.to_uint<I>();
```
For us.
The main goal here however is to have a single generic number conversion
API between all of the String classes.
117 lines
3.6 KiB
C++
117 lines
3.6 KiB
C++
/*
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* Copyright (c) 2020, Nico Weber <thakis@chromium.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Format.h>
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#include <AK/StdLibExtras.h>
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#include <AK/Vector.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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char const* const g_usage = R"(Usage:
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seq [-h|--help]
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seq LAST
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seq FIRST LAST
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seq FIRST INCREMENT LAST
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)";
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static void print_usage(FILE* stream)
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{
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fputs(g_usage, stream);
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}
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static double get_double(char const* name, StringView d_string, size_t* number_of_decimals)
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{
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auto d = d_string.to_number<double>();
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if (!d.has_value()) {
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warnln("{}: invalid argument \"{}\"", name, d_string);
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print_usage(stderr);
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exit(1);
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}
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if (auto dot = d_string.find('.'); dot.has_value())
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*number_of_decimals = d_string.length() - *dot - 1;
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else
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*number_of_decimals = 0;
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return *d;
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}
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio"));
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TRY(Core::System::unveil(nullptr, nullptr));
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StringView separator = "\n"sv;
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StringView terminator = ""sv;
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Vector<StringView> parameters;
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Core::ArgsParser args_parser;
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args_parser.add_option(separator, "Characters to print after each number (default: \\n)", "separator", 's', "separator");
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args_parser.add_option(terminator, "Characters to print at the end of the sequence", "terminator", 't', "terminator");
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args_parser.add_positional_argument(parameters, "1 to 3 parameters, interpreted as LAST, FIRST LAST, or FIRST INCREMENT LAST", "parameters");
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args_parser.parse(arguments);
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double start = 1;
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double step = 1;
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double end = 1;
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size_t number_of_start_decimals = 0;
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size_t number_of_step_decimals = 0;
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size_t number_of_end_decimals = 0;
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switch (parameters.size()) {
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case 1:
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end = get_double(arguments.argv[0], parameters[0], &number_of_end_decimals);
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break;
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case 2:
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start = get_double(arguments.argv[0], parameters[0], &number_of_start_decimals);
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end = get_double(arguments.argv[0], parameters[1], &number_of_end_decimals);
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break;
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case 3:
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start = get_double(arguments.argv[0], parameters[0], &number_of_start_decimals);
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step = get_double(arguments.argv[0], parameters[1], &number_of_step_decimals);
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end = get_double(arguments.argv[0], parameters[2], &number_of_end_decimals);
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break;
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default:
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warnln("{}: unexpected number of arguments", arguments.argv[0]);
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print_usage(stderr);
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return 1;
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}
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if (step == 0) {
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warnln("{}: increment must not be 0", arguments.argv[0]);
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return 1;
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}
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if (__builtin_isnan(start) || __builtin_isnan(step) || __builtin_isnan(end)) {
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warnln("{}: start, step, and end must not be NaN", arguments.argv[0]);
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return 1;
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}
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size_t number_of_decimals = max(number_of_start_decimals, max(number_of_step_decimals, number_of_end_decimals));
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int n = static_cast<int>((end - start) / step);
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double d = start;
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for (int i = 0; i <= n; ++i) {
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char buf[40];
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snprintf(buf, sizeof(buf), "%f", d);
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if (char* dot = strchr(buf, '.')) {
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if (number_of_decimals == 0)
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*dot = '\0';
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else if ((dot - buf) + 1 + number_of_decimals < (int)sizeof(buf))
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dot[1 + number_of_decimals] = '\0';
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}
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out("{}{}", buf, separator);
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d += step;
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}
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if (!terminator.is_empty())
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out(terminator);
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return 0;
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}
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