Function real_env

src/core/app_paths.cpp:60–63

getenv that treats an empty value as unset (empty %VAR% / $VAR is useless).

namespace {
// getenv that treats an empty value as unset (empty %VAR% / $VAR is useless).
const char* real_env(const char* key) {
    const char* v = std::getenv(key);
    return (v && *v) ? v : nullptr;
}
#ifdef _WIN32
constexpr bool kWindows = true;
#else