/* $begin setjmp */
#include "csapp.h"

jmp_buf buf;

int error1 = 0; 
int error2 = 1;

void foo(void), bar(void);

int main() 
{
    switch(setjmp(buf)) {
    case 0: 
	foo();
        break;
    case 1: 
	printf("Detected an error1 condition in foo\n");
        break;
    case 2: 
	printf("Detected an error2 condition in foo\n");
        break;
    default:
	printf("Unknown error condition in foo\n");
    }
    exit(0);
}

/* Deeply nested function foo */
void foo(void) 
{
    if (error1)
	longjmp(buf, 1); 
    bar();
}

void bar(void) 
{
    if (error2)
	longjmp(buf, 2); 
}
/* $end setjmp */