setjmp/tst-setjmp.c

   1 /* Copyright (C) 1991, 1992 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <stdio.h>
  21 #include <setjmp.h>
  22 #include <stdlib.h>
  23
  24 static jmp_buf env;
  25 static int last_value = -1, lose = 0;
  26
  27 void
  28 DEFUN(jump, (val), int val)
  29 {
  30   longjmp(env, val);
  31 }
  32
  33 int
  34 DEFUN_VOID(main)
  35 {
  36   int value;
  37
  38   value = setjmp(env);
  39   if (value != last_value + 1)
  40     {
  41       fputs("Shouldn't have ", stdout);
  42       lose = 1;
  43     }
  44   last_value = value;
  45   switch (value)
  46     {
  47     case 0:
  48       puts("Saved environment.");
  49       jump(0);
  50     default:
  51       printf("Jumped to %d.\n", value);
  52       if (value < 10)
  53         jump(value + 1);
  54     }
  55
  56   if (lose || value != 10)
  57     puts("Test FAILED!");
  58   else
  59     puts("Test succeeded!");
  60   exit(lose ? EXIT_FAILURE : EXIT_SUCCESS);
  61 }