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ctype
.....\_ctype.c
.....\_isalnum.c
.....\_isalpha.c
.....\_isascii.c
.....\_iscntrl.c
.....\_isdigit.c
.....\_isgraph.c
.....\_islower.c
.....\_isprint.c
.....\_ispunct.c
.....\_isspace.c
.....\_isupper.c
.....\_isxdigi.c
.....\_toascii.c
.....\_tolower.c
.....\_toupper.c
.....\__tolowe.c
.....\__touppe.c