more cleaning

cstdlib/ctype.c

@@ -0,0 +1,55 @@
+int
+isblank(int c){
+	return c == '\t'
+		|| c == ' ';
+}
+
+int
+isspace(int c){
+	return isblank(c)
+		|| c == '\n'
+		|| c == '\v'
+		|| c == '\f'
+		|| c == '\r';
+}
+
+int
+isgraph(int c){ return c >= '!' && c <= '~'; }
+
+int
+isprint(int c){ return c == ' ' || isgraph(c); }
+
+int
+iscntrl(int c){ return !isprint(c); }
+
+int
+isdigit(int c){ return c >= '0' && c <= '9'; }
+
+int
+islower(int c){ return c >= 'a' && c <= 'z'; }
+
+int
+isupper(int c){ return c >= 'A' && c <= 'Z'; }
+
+int
+isxdigit(int c){
+	return
+		isdigit(c)
+		|| (c >= 'a' && c <= 'f')
+		|| (c >= 'A' && c <= 'F');
+}
+
+int
+isalpha(int c){ return islower(c) || isupper(c); }
+
+int
+isalnum(int c){ return isalpha(c) || isdigit(c) };
+
+int
+ispunct(int c){ return c != ' ' && !isalnum(c) };
+
+int
+tolower(int c){ return c - isupper(c) * ('A' - 'a'); }
+
+int
+toupper(int c){ return c + islower(c) * ('A' - 'a'); }

cstdlib/ctype.h

@@ -0,0 +1,17 @@
+#ifndef _CTYPE_H
+#	define CTYPE_H
+int isblank(int c);
+int isspace(int c);
+int isgraph(int c);
+int isprint(int c);
+int iscntrl(int c);
+int isdigit(int c);
+int islower(int c);
+int isupper(int c);
+int isxdigit(int c);
+int isalpha(int c);
+int isalnum(int c);
+int ispunct(int c);
+int tolower(int c);
+int toupper(int c);
+#endif /* ifndef _CTYPE_H */