HelenOS sources

UINT_MAX          164 common/str.c   #define CHAR_INVALID ((char32_t) UINT_MAX)
UINT_MAX          164 kernel/generic/common/str.c #define CHAR_INVALID ((char32_t) UINT_MAX)
UINT_MAX          164 uspace/lib/c/common/str.c #define CHAR_INVALID ((char32_t) UINT_MAX)
UINT_MAX          549 uspace/lib/cpp/include/__bits/limits.hpp                 return UINT_MAX;