#define havechar havekey
/* libc/ctype.c */
-int isspace(int c);
+int isalnum(int c);
+int isalpha(int c);
+int isascii(int c);
+int isblank(int c);
+int iscntrl(int c);
int isdigit(int c);
+int isgraph(int c);
+int islower(int c);
+int isprint(int c);
+int ispunct(int c);
+int isspace(int c);
+int isupper(int c);
+int isxdigit(int c);
int tolower(int c);
+int toupper(int c);
/* libc/ipchecksum.c */
unsigned short ipchksum(const unsigned short *ptr, unsigned long nbytes);