system.hpp

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#pragma once
 
#include <algorithm>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <optional>
#include <string>
#include <string_view>
 
namespace pulp::runtime {
 
inline std::optional<std::string> get_env(std::string_view name) {
    std::string key{name};
#ifdef _WIN32
    char* value = nullptr;
    size_t size = 0;
    if (_dupenv_s(&value, &size, key.c_str()) != 0 || value == nullptr)
        return std::nullopt;
 
    std::string result(value);
    std::free(value);
    if (result.empty()) return std::nullopt;
    return result;
#else
    if (const char* value = std::getenv(key.c_str()); value && *value)
        return std::string(value);
    return std::nullopt;
#endif
}
 
inline std::tm gmtime_utc(std::time_t value) {
    std::tm out{};
#ifdef _WIN32
    gmtime_s(&out, &value);
#else
    if (gmtime_r(&value, &out) == nullptr)
        out = {};
#endif
    return out;
}
 
inline std::tm localtime_local(std::time_t value) {
    std::tm out{};
#ifdef _WIN32
    localtime_s(&out, &value);
#else
    if (localtime_r(&value, &out) == nullptr)
        out = {};
#endif
    return out;
}
 
inline void copy_c_string(char* dest, std::size_t dest_size, std::string_view src) {
    if (dest == nullptr || dest_size == 0) return;
    const auto count = (std::min)(src.size(), dest_size - 1);
    std::memcpy(dest, src.data(), count);
    dest[count] = '\0';
}
 
template <std::size_t N>
inline void copy_c_string(char (&dest)[N], std::string_view src) {
    copy_c_string(dest, N, src);
}
 
// ── System information ──────────────────────────────────────────────────
 
struct SystemInfo {
    std::string os_name;          // "macOS", "Windows", "Linux"
    std::string os_version;       // "15.0", "10.0.22621", "6.5.0"
    std::string cpu_model;        // "Apple M2 Pro", "Intel Core i9-13900K"
    int cpu_cores = 0;            // Physical cores
    int cpu_threads = 0;          // Logical threads
    uint64_t total_memory_mb = 0; // Total RAM in MB
    std::string arch;             // "arm64", "x86_64"
 
    // Extended CPU features
    bool has_sse2 = false;
    bool has_sse4_1 = false;
    bool has_avx = false;
    bool has_avx2 = false;
    bool has_avx512 = false;
    bool has_neon = false;         // ARM NEON (always true on arm64)
    bool has_fma = false;          // Fused multiply-add
 
    // Display info
    int display_count = 0;
    int primary_display_width = 0;
    int primary_display_height = 0;
    float primary_display_scale = 1.0f;  // HiDPI scale factor
};

const SystemInfo& get_system_info();

int cpu_thread_count();

uint64_t total_memory_mb();
 
} // namespace pulp::runtime