Argv_inl.hpp
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// Copyright (c) 2017-2023, University of Cincinnati, developed by Henry Schreiner
// under NSF AWARD 1414736 and by the respective contributors.
// All rights reserved.
//
// SPDX-License-Identifier: BSD-3-Clause
#pragma once
// This include is only needed for IDEs to discover symbols
#include <CLI/Argv.hpp>
#include <CLI/Encoding.hpp>
// [CLI11:public_includes:set]
#include <algorithm>
#include <memory>
#include <stdexcept>
#include <string>
#include <vector>
// [CLI11:public_includes:end]
// [CLI11:argv_inl_includes:verbatim]
#if defined(_WIN32)
#if !(defined(_AMD64_) || defined(_X86_) || defined(_ARM_))
#if defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64) || defined(_M_X64) || \
defined(_M_AMD64)
#define _AMD64_
#elif defined(i386) || defined(__i386) || defined(__i386__) || defined(__i386__) || defined(_M_IX86)
#define _X86_
#elif defined(__arm__) || defined(_M_ARM) || defined(_M_ARMT)
#define _ARM_
#endif
#endif
#define NOMINMAX
// first
#include <windef.h>
// second
#include <winbase.h>
// third
#include <processthreadsapi.h>
#include <shellapi.h>
#undef NOMINMAX
#elif defined(__APPLE__)
#include <crt_externs.h>
#endif
// [CLI11:argv_inl_includes:end]
namespace CLI {
// [CLI11:argv_inl_hpp:verbatim]
namespace detail {
#ifdef __APPLE__
// Copy argc and argv as early as possible to avoid modification
static const std::vector<const char *> static_args = [] {
static const std::vector<std::string> static_args_as_strings = [] {
std::vector<std::string> args_as_strings;
int argc = *_NSGetArgc();
char **argv = *_NSGetArgv();
args_as_strings.reserve(static_cast<size_t>(argc));
for(size_t i = 0; i < static_cast<size_t>(argc); i++) {
args_as_strings.push_back(argv[i]);
}
return args_as_strings;
}();
std::vector<const char *> static_args_result;
static_args_result.reserve(static_args_as_strings.size());
for(const auto &arg : static_args_as_strings) {
static_args_result.push_back(arg.data());
}
return static_args_result;
}();
#endif
/// Command-line arguments, as passed in to this executable, converted to utf-8 on Windows.
CLI11_INLINE const std::vector<const char *> &args() {
// This function uses initialization via lambdas extensively to take advantage of the thread safety of static
// variable initialization [stmt.dcl.3]
#ifdef _WIN32
static const std::vector<const char *> static_args = [] {
static const std::vector<std::string> static_args_as_strings = [] {
// On Windows, take arguments from GetCommandLineW and convert them to utf-8.
std::vector<std::string> args_as_strings;
int argc = 0;
auto deleter = [](wchar_t **ptr) { LocalFree(ptr); };
// NOLINTBEGIN(*-avoid-c-arrays)
auto wargv =
std::unique_ptr<wchar_t *[], decltype(deleter)>(CommandLineToArgvW(GetCommandLineW(), &argc), deleter);
// NOLINTEND(*-avoid-c-arrays)
if(wargv == nullptr) {
throw std::runtime_error("CommandLineToArgvW failed with code " + std::to_string(GetLastError()));
}
args_as_strings.reserve(static_cast<size_t>(argc));
for(size_t i = 0; i < static_cast<size_t>(argc); ++i) {
args_as_strings.push_back(narrow(wargv[i]));
}
return args_as_strings;
}();
std::vector<const char *> static_args_result;
static_args_result.reserve(static_args_as_strings.size());
for(const auto &arg : static_args_as_strings) {
static_args_result.push_back(arg.data());
}
return static_args_result;
}();
return static_args;
#elif defined(__APPLE__)
return static_args;
#else
static const std::vector<const char *> static_args = [] {
static const std::vector<char> static_cmdline = [] {
// On posix, retrieve arguments from /proc/self/cmdline, separated by null terminators.
std::vector<char> cmdline;
auto deleter = [](FILE *f) { std::fclose(f); };
std::unique_ptr<FILE, decltype(deleter)> fp_unique(std::fopen("/proc/self/cmdline", "r"), deleter);
FILE *fp = fp_unique.get();
if(!fp) {
throw std::runtime_error("could not open /proc/self/cmdline for reading"); // LCOV_EXCL_LINE
}
size_t size = 0;
while(std::feof(fp) == 0) {
cmdline.resize(size + 128);
size += std::fread(cmdline.data() + size, 1, 128, fp);
if(std::ferror(fp) != 0) {
throw std::runtime_error("error during reading /proc/self/cmdline"); // LCOV_EXCL_LINE
}
}
cmdline.resize(size);
return cmdline;
}();
std::size_t argc = static_cast<std::size_t>(std::count(static_cmdline.begin(), static_cmdline.end(), '\0'));
std::vector<const char *> static_args_result;
static_args_result.reserve(argc);
for(auto it = static_cmdline.begin(); it != static_cmdline.end();
it = std::find(it, static_cmdline.end(), '\0') + 1) {
static_args_result.push_back(static_cmdline.data() + (it - static_cmdline.begin()));
}
return static_args_result;
}();
return static_args;
#endif
}
} // namespace detail
CLI11_INLINE const char *const *argv() { return detail::args().data(); }
CLI11_INLINE int argc() { return static_cast<int>(detail::args().size()); }
// [CLI11:argv_inl_hpp:end]
} // namespace CLI