Nicht-lokaler Ausführungs-Steuerfluss und Ausnahme-Emulation via setjmp und longjmp

#include <stdio.h>
#include <setjmp.h>
 
static jmp_buf execution_context;
 
void deep_calculation(volatile int *status_code) {
    if (*status_code < 0) {
        /* Perform non-local goto restoring stack context saved by setjmp */
        longjmp(execution_context, 404);
    }
}
 
int main(void) {
    /* Variables modified between setjmp and longjmp must be volatile to prevent clobbering */
    volatile int state = -1;
    
    int result = setjmp(execution_context);
    if (result == 0) {
        printf("Context saved. Executing operation...\n");
        deep_calculation(&state);
    } else {
        printf("Caught exception with code: %d\n", result);
    }
    return 0;
}