static size_t get_cmdline_budget()

{

#ifdef _WIN32

    // Windows: Length limit is fixed at 32737

    // Leave 4096 of overhead for executable and files

    return 28701; // 32737-4096

    // Windows: Length limit is fixed at 32767

    // Leave 4096 of overhead for executable and files (rough overestimate)

    return 32767 - 4096;

#else

    // Unix: Length limit is from sysconf

    // Leave 32K of overhead for executable, files, and environment

    // Leave 32K of overhead for executable, files, and environment (rough overestimate)

    // Also guard against sysconf failure (-1)

    long const arg_max = sysconf(_SC_ARG_MAX);

    size_t usable = 0;