nuttx/libs/libc/ctype
..
lib_isalnum.c
lib_isalpha.c
lib_isascii.c
lib_isblank.c
lib_iscntrl.c
lib_isdigit.c
lib_isgraph.c
lib_islower.c
lib_isprint.c
lib_ispunct.c
lib_isspace.c
lib_isupper.c
lib_isxdigit.c
lib_tolower.c
lib_toupper.c
Make.defs