HelenOS sources

isblank            62 common/stdc/ctype.c int isblank(int c)
isblank            62 kernel/generic/common/stdc/ctype.c int isblank(int c)
isblank            62 uspace/lib/c/common/stdc/ctype.c int isblank(int c)
isblank           127 uspace/lib/cpp/include/__bits/locale/locale_misc.hpp     bool isblank(Char c, const locale& loc)