1 files changed, 41 insertions, 0 deletions
diff --git a/src/__checked_i.c b/src/__checked_i.c
new file mode 100644
index 00000000..f3b62bcf
--- /dev/null
+++ b/src/__checked_i.c
@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <ctype.h>
+#include <stdarg.h>
+#include "_assert.h"
+
+#define F(fn) (int(*)())(fn)
+
+int __checked_i(const char *file, const char *func, unsigned long long line, int (*fn)(), ...)
+{
+	va_list ap;
+	int ret = -1;
+
+	__checked_call.func = (char*)func;
+	__checked_call.file = (char*)file;
+	__checked_call.line = line;
+
+	va_start(ap, fn);
+
+	if (fn == F(isalpha)
+		|| fn == F(isdigit)
+		|| fn == F(isupper)
+		|| fn == F(islower)
+		|| fn == F(toupper)
+		|| fn == F(tolower)
+		) {
+		int arg = va_arg(ap, int);
+		ret = fn(arg);
+	}
+
+	va_end(ap);
+
+	__checked_call.func = NULL;
+	__checked_call.file = NULL;
+	__checked_call.line = 0;
+
+	return ret;
+}
+
+/*
+STDC(0)
+*/