hacked new tests in

str/isempty.c

@@ -0,0 +1,2 @@
+#define _isempty_c
+int isempty(int c){ return 0; }

str/isvalue.c

@@ -0,0 +1,2 @@
+#define _isvalue_c
+int isvalue(int c){ return 1; }

str/str.c

@@ -10,6 +10,11 @@
 
 static char *program_name = "str";
 
+/* don't use this */
+#include "isempty.c"
+
+#include "isvalue.c"
+
 static struct {
 	char *name;
 	int (*f)(int);
@@ -20,12 +25,18 @@ static struct {
 	{ "iscntrl", iscntrl },
 	{ "isdigit", isdigit },
 	{ "isxdigit", isxdigit },
+#if defined _isempty_c
+	{ "isempty", isempty },
+#endif
 	{ "isgraph", isgraph },
 	{ "islower", islower },
 	{ "isprint", isprint },
 	{ "ispunct", ispunct },
 	{ "isspace", isspace },
 	{ "isupper", isupper }
+#if defined _isvalue_c
+,	{ "isvalue", isvalue }
+#endif
 };
 
 int main(int argc, char *argv[]){