setjmp/tst-setjmp.c

   1 /* Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <stdio.h>
  20 #include <setjmp.h>
  21 #include <stdlib.h>
  22
  23 static jmp_buf env;
  24 static int last_value = -1, lose = 0;
  25
  26 void
  27 jump (int val)
  28 {
  29   longjmp (env, val);
  30 }
  31
  32 int
  33 main (void)
  34 {
  35   int value;
  36
  37   value = setjmp (env);
  38   if (value != last_value + 1)
  39     {
  40       fputs("Shouldn't have ", stdout);
  41       lose = 1;
  42     }
  43   last_value = value;
  44   switch (value)
  45     {
  46     case 0:
  47       puts("Saved environment.");
  48       jump (0);
  49     default:
  50       printf ("Jumped to %d.\n", value);
  51       if (value < 10)
  52         jump (value + 1);
  53     }
  54
  55   if (lose || value != 10)
  56     puts ("Test FAILED!");
  57   else
  58     puts ("Test succeeded!");
  59   exit (lose ? EXIT_FAILURE : EXIT_SUCCESS);
  60 }