[SPCA] Finish unorthodox control flow

semester3/spca/code-examples/01_asm/08_unorthodox-controlflow.c

@@ -0,0 +1,22 @@
+#include <setjmp.h>
+#include <stdio.h>
+
+static jmp_buf buf;
+
+void second( void ) {
+    printf( "second\n" );
+    longjmp( buf, 1 );
+}
+
+void first( void ) {
+    second();
+    printf( "first\n" ); // Never executed
+}
+
+int main() {
+    if ( !setjmp( buf ) ) // returns 0 initially
+        first();
+    else
+        printf( "main\n" ); // 1 is returned when longjmp is executed
+    return 0;
+}