#include "doctest/parts/private/prelude.h"

DOCTEST_SUPPRESS_PRIVATE_WARNINGS_PUSH

#ifndef DOCTEST_CONFIG_DISABLE

namespace doctest {
namespace detail {
#ifdef DOCTEST_IS_DEBUGGER_ACTIVE
bool isDebuggerActive() {
    return DOCTEST_IS_DEBUGGER_ACTIVE();
}
#else // DOCTEST_IS_DEBUGGER_ACTIVE
#ifdef DOCTEST_PLATFORM_LINUX
class ErrnoGuard {
public:
    ErrnoGuard()
        : m_oldErrno(errno) {}
    ~ErrnoGuard() {
        errno = m_oldErrno;
    }

private:
    int m_oldErrno;
};
// See the comments in Catch2 for the reasoning behind this implementation:
// https://github.com/catchorg/Catch2/blob/v2.13.1/include/internal/catch_debugger.cpp#L79-L102
bool isDebuggerActive() {
    const ErrnoGuard guard;
    std::ifstream in("/proc/self/status");
    for (std::string line; std::getline(in, line);) {
        static const int PREFIX_LEN = 11;
        if (line.compare(0, PREFIX_LEN, "TracerPid:\t") == 0) {
            return line.length() > PREFIX_LEN && line[PREFIX_LEN] != '0';
        }
    }
    return false;
}
#elif defined(DOCTEST_PLATFORM_MAC)
// The following function is taken directly from the following technical note:
// https://developer.apple.com/library/archive/qa/qa1361/_index.html
// Returns true if the current process is being debugged (either
// running under the debugger or has a debugger attached post facto).
bool isDebuggerActive() {
    int mib[4];
    kinfo_proc info;
    size_t size;
    // Initialize the flags so that, if sysctl fails for some bizarre
    // reason, we get a predictable result.
    info.kp_proc.p_flag = 0;
    // Initialize mib, which tells sysctl the info we want, in this case
    // we're looking for information about a specific process ID.
    mib[0] = CTL_KERN;
    mib[1] = KERN_PROC;
    mib[2] = KERN_PROC_PID;
    mib[3] = getpid();
    // Call sysctl.
    size = sizeof(info);
    if (sysctl(mib, DOCTEST_COUNTOF(mib), &info, &size, nullptr, 0) != 0) {
        std::cerr << "\nCall to sysctl failed - unable to determine if debugger is active **\n";
        return false;
    }
    // We're being debugged if the P_TRACED flag is set.
    return ((info.kp_proc.p_flag & P_TRACED) != 0);
}
#elif DOCTEST_MSVC || defined(__MINGW32__) || defined(__MINGW64__)
bool isDebuggerActive() {
    return ::IsDebuggerPresent() != 0;
}
#else
bool isDebuggerActive() {
    return false;
}
#endif // Platform
#endif // DOCTEST_IS_DEBUGGER_ACTIVE
} // namespace detail
} // namespace doctest

#endif // DOCTEST_CONFIG_DISABLE

DOCTEST_SUPPRESS_PRIVATE_WARNINGS_POP
