summary refs log tree commit diff
path: root/setjmp/tst-setjmp.c
blob: b4cba1177df493269f5f794fa467049b1f418847 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
/* Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <stdio.h>
#include <setjmp.h>
#include <stdlib.h>

static jmp_buf env;
static int last_value = -1, lose = 0;

void
jump (int val)
{
  longjmp (env, val);
}

int
main (void)
{
  int value;

  value = setjmp (env);
  if (value != last_value + 1)
    {
      fputs("Shouldn't have ", stdout);
      lose = 1;
    }
  last_value = value;
  switch (value)
    {
    case 0:
      puts("Saved environment.");
      jump (0);
    default:
      printf ("Jumped to %d.\n", value);
      if (value < 10)
	jump (value + 1);
    }

  if (!lose && value == 10)
    {
      /* Do a second test, this time without `setjmp' being a macro.
         This is not required by ISO C but we have this for compatibility.  */
#undef setjmp
      extern int setjmp (jmp_buf);

      last_value = -1;
      lose = 0;

      value = setjmp (env);
      if (value != last_value + 1)
	{
	  fputs("Shouldn't have ", stdout);
	  lose = 1;
	}
      last_value = value;
      switch (value)
	{
	case 0:
	  puts("Saved environment.");
	  jump (0);
	default:
	  printf ("Jumped to %d.\n", value);
	  if (value < 10)
	    jump (value + 1);
	}
    }

  if (!lose && value == 10)
    {
      /* And again for the `__setjmp' function.  */
      extern int __setjmp (jmp_buf);

      last_value = -1;
      lose = 0;

      value = __setjmp (env);
      if (value != last_value + 1)
	{
	  fputs("Shouldn't have ", stdout);
	  lose = 1;
	}
      last_value = value;
      switch (value)
	{
	case 0:
	  puts("Saved environment.");
	  jump (0);
	default:
	  printf ("Jumped to %d.\n", value);
	  if (value < 10)
	    jump (value + 1);
	}
    }

  if (lose || value != 10)
    puts ("Test FAILED!");
  else
    puts ("Test succeeded!");
  exit (lose ? EXIT_FAILURE : EXIT_SUCCESS);
}