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

jmp_buf buf;

int error1 = 0; 
int error2 = 1;

void foo(void), bar(void);

int main() 
{
    int rc;

    rc = setjmp(buf);
    if (rc == 0)
	foo();
    else if (rc == 1) 
	printf("Detected an error1 condition in foo\n");
    else if (rc == 2) 
	printf("Detected an error2 condition in foo\n");
    else 
	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 */