HelenOS sources

isalnum            57 common/stdc/ctype.c int isalnum(int c)
isalnum            57 kernel/generic/common/stdc/ctype.c int isalnum(int c)
isalnum            57 uspace/lib/c/common/stdc/ctype.c int isalnum(int c)
isalnum           115 uspace/lib/cpp/include/__bits/locale/locale_misc.hpp     bool isalnum(Char c, const locale& loc)