Added all remaining gists.

exceptions.h/README.md

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+Some practice with setjmp and longjmp.

exceptions.h/exceptions.h

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+#ifndef EXCEPTIONS_H
+#define EXCEPTIONS_H
+
+#include <setjmp.h>
+
+static jmp_buf env;
+
+typedef int exception_t;
+
+exception_t excptno;
+
+#define try if ((excptno = setjmp(env)) == 0)
+#define catch else
+#define throw(X) longjmp(env, X);
+
+#endif

exceptions.h/main.c

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+#include <stdio.h>
+#include "exceptions.h"
+
+void f() {
+	throw(89);
+	printf("All good.\n");
+}
+
+int main(void) {
+	try {
+		f();
+	} catch {
+	  printf("Caught %d!\n", excptno);
+	}
+
+	return 0;
+}