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/*
* This source code is released into the public domain.
*/
#ifndef LFJAIL_ARGV_HH
#define LFJAIL_ARGV_HH
#include <memory>
#include <ranges>
#include <string>
#include <vector>
namespace lfjail {
/*
* argv: stores a null-terminated array of nul-terminated C strings.
* argv::data() is suitable for passing to ::execv().
*
* Create an argv using argv::from_range(), which takes a range of
* string-like objects.
*/
struct argv {
/*
* Create a new argv from a range.
*/
static auto from_range(std::ranges::range auto &&args) -> argv {
auto ret = argv{};
for (auto &&arg : args)
ret._add_arg(std::string_view(arg));
ret._args.push_back(nullptr);
return ret;
}
template<typename T>
static auto from_args(std::initializer_list<T> &&args) {
return from_range(std::move(args));
}
argv(argv &&) noexcept = default;
auto operator=(this argv &, argv &&other) -> argv& = default;
// Not copyable. TODO: for completeness, it probably should be.
argv(argv const &) = delete;
auto operator=(this argv &, argv const &other) -> argv& = delete;
~argv();
// Access the stored arguments.
auto data(this argv const &self) -> char const * const * {
return self._args.data();
}
auto data(this argv &self) -> char * const * {
return self._args.data();
}
auto size(this argv const &self) {
return self._args.size();
}
// Range access
auto begin(this argv const &self) {
return self._args.begin();
}
auto end(this argv const &self) {
return self._args.end();
}
private:
// Use the from_range() factory method to create new instances.
argv() = default;
// The argument pointers, including the null terminator.
std::vector<char *> _args;
// Add a new argument to the array.
auto _add_arg(this argv &self, std::string_view arg) -> void;
};
} // namespace lf
#endif // !LFJAIL_ARGV_HH
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