Method GetMultiStringLineBeginningWith

PathCopyCopy/src/PluginUtils.cpp:451–477

Given a multi-line string read from a REG_MULTI_SZ registry value, finds a line that begins with a given prefix and returns it. @param p_MultiStringValue The multi-string value. @param p_Prefix Prefix of line to look for. @return The entire matching line (excluding prefix), or an empty string if line is not found.

    // @return The entire matching line (excluding prefix), or an empty string if line is not found.
    //
    std::wstring PluginUtils::GetMultiStringLineBeginningWith(const std::wstring& p_MultiStringValue,
                                                              const std::wstring& p_Prefix)
    {
        std::wstring line;

        // Multi-line values contain embedded NULLs to separate the lines.
        std::wstring::size_type offset = 0;
        do {
            const std::wstring::size_type endOffset = p_MultiStringValue.find_first_of(L'\0', offset);
            if (endOffset == offset) {
                // We're at the end of the value.
                break;
            }

            if (p_MultiStringValue.find(p_Prefix, offset) == offset) {
                // This is the line we're looking for.
                const std::wstring::size_type prefixSize = p_Prefix.size();
                line = p_MultiStringValue.substr(offset + prefixSize, endOffset - offset - prefixSize);
                break;
            } else {
                // Not the line, go to next one.
                offset = endOffset + 1;
            }
        } while (offset < p_MultiStringValue.size());

        return line;
    }

    //
    // Converts a string containing a list of plugin unique identifiers