qt-everywhere-src-5.14.1/qtbase/src/corelib/kernel/qfunctions_fake_env_p.h

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#ifndef QFUNCTIONS_FAKE_ENV_P_H
#define QFUNCTIONS_FAKE_ENV_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "qbytearray.h"
#include "qvector.h"

QT_BEGIN_NAMESPACE

// Environment ------------------------------------------------------
struct Variable {
    Variable() { }

    Variable(const QByteArray &name, const QByteArray &value)
        : name(name), value(value) { }

    QByteArray name;
    QByteArray value;
};

Q_DECLARE_TYPEINFO(Variable, Q_MOVABLE_TYPE);

struct NameEquals {
    typedef bool result_type;
    const char *name;
    explicit NameEquals(const char *name) noexcept : name(name) {}
    result_type operator()(const Variable &other) const noexcept
    { return qstrcmp(other.name, name) == 0; }
};

#ifndef Q_CLANG_QDOC
Q_GLOBAL_STATIC(QVector<Variable>, qt_app_environment)
#endif

errno_t qt_fake_getenv_s(size_t *sizeNeeded, char *buffer, size_t bufferSize, const char *varName)
{
    if (!sizeNeeded)
        return EINVAL;

    QVector<Variable>::const_iterator end = qt_app_environment->constEnd();
    QVector<Variable>::const_iterator iterator = std::find_if(qt_app_environment->constBegin(),
                                                              end,
                                                              NameEquals(varName));
    if (iterator == end) {
        if (buffer)
            buffer[0] = '\0';
        return ENOENT;
    }

    const int size = iterator->value.size() + 1;
    if (bufferSize < size_t(size)) {
        *sizeNeeded = size;
        return ERANGE;
    }

    qstrcpy(buffer, iterator->value.constData());
    return 0;
}

errno_t qt_fake__putenv_s(const char *varName, const char *value)
{
    QVector<Variable>::iterator end = qt_app_environment->end();
    QVector<Variable>::iterator iterator = std::find_if(qt_app_environment->begin(),
                                                        end,
                                                        NameEquals(varName));
    if (!value || !*value) {
        if (iterator != end)
            qt_app_environment->erase(iterator);
    } else {
        if (iterator == end)
            qt_app_environment->append(Variable(varName, value));
        else
            iterator->value = value;
    }

    return 0;
}

QT_END_NAMESPACE

#endif // QFUNCTIONS_FAKE_ENV_P_H