// filename:c2011-7-13-2-1-ex.c
// original examples and/or notes:
// 		(c) ISO/IEC JTC1 SC22 WG14 N1570, April 12, 2011
// http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf
// 			C2011 7.13.2.1 The longjmp function
// compile and output mechanism:
// 		(c) Ogawa Kiyoshi, kaizen@gifu-u.ac.jp, December.29, 2013
// compile errors and/or wornings:
// 1	(c) Apple LLVM version 4.2 (clang-425.0.27) (based on LLVM 3.2svn)
// 			Target: x86_64-apple-darwin11.4.2 //Thread model: posix
// 		(c) LLVM 2003-2009 University of Illinois at Urbana-Champaign.
// 2    gcc-4.9 (GCC) 4.9.0 20131229 (experimental)
//      Copyright (C) 2013 Free Software Foundation, Inc.
#include <stdio.h>

// Example
#include <setjmp.h>
jmp_buf buf;
void g(int n);
void h(int n);
int n = 6;
void f(void)
{
	int x[n]; // valid: f is not terminated
	printf("f() %d\n", x[n]);
setjmp(buf);
g(n);
}
void g(int n)
{
	int a[n]; // a may remain allocated
		printf("g() %d\n", a[n]);
h(n);
}
void h(int n)
{
	int b[n]; // b may remain allocated
		printf("h() %d\n", b[n]);
longjmp(buf, 2); // might cause memory loss
}

int main(void)
{
	f();
return printf("7.13.2.1 The longjmp function %d\n", *buf);
}
// output may be 
//f() 0
//g() 1533516432
//h() 0
//g() 1533516432
//h() 0
//gとhのくり返しが続く。