host_parse.hpp

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#pragma once
 
#include <charconv>
#include <cstdint>
#include <cstdlib>
#include <string_view>
 
namespace cusbf::detail {
 
[[nodiscard]] inline uint64_t parse_env_mebibytes(std::string_view value) {
    if (value.empty()) {
        return 0;
    }
 
    uint64_t mebibytes = 0;
    const auto* begin = value.data();
    const auto* end = begin + value.size();
    const auto [ptr, ec] = std::from_chars(begin, end, mebibytes);
    if (ec != std::errc{} || ptr == begin) {
        return 0;
    }
    return mebibytes;
}
 
[[nodiscard]] inline std::string_view getenv_value(const char* env_name) {
    const char* value = std::getenv(env_name);
    if (value == nullptr || value[0] == '\0') {
        return {};
    }
    return value;
}
 
}  // namespace cusbf::detail