Added a gnulib with GPL components for use by applications.
[gnutls:gnutls.git] / src / gl / msvc-inval.c
1 /* Invalid parameter handler for MSVC runtime libraries.
2    Copyright (C) 2011-2013 Free Software Foundation, Inc.
3
4    This program is free software; you can redistribute it and/or modify
5    it under the terms of the GNU General Public License as published by
6    the Free Software Foundation; either version 3, or (at your option)
7    any later version.
8
9    This program 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
12    GNU General Public License for more details.
13
14    You should have received a copy of the GNU General Public License along
15    with this program; if not, see <http://www.gnu.org/licenses/>.  */
16
17 #include <config.h>
18
19 /* Specification.  */
20 #include "msvc-inval.h"
21
22 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER \
23     && !(MSVC_INVALID_PARAMETER_HANDLING == SANE_LIBRARY_HANDLING)
24
25 /* Get _invalid_parameter_handler type and _set_invalid_parameter_handler
26    declaration.  */
27 # include <stdlib.h>
28
29 # if MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
30
31 static void __cdecl
32 gl_msvc_invalid_parameter_handler (const wchar_t *expression,
33                                    const wchar_t *function,
34                                    const wchar_t *file,
35                                    unsigned int line,
36                                    uintptr_t dummy)
37 {
38 }
39
40 # else
41
42 /* Get declarations of the native Windows API functions.  */
43 #  define WIN32_LEAN_AND_MEAN
44 #  include <windows.h>
45
46 #  if defined _MSC_VER
47
48 static void __cdecl
49 gl_msvc_invalid_parameter_handler (const wchar_t *expression,
50                                    const wchar_t *function,
51                                    const wchar_t *file,
52                                    unsigned int line,
53                                    uintptr_t dummy)
54 {
55   RaiseException (STATUS_GNULIB_INVALID_PARAMETER, 0, 0, NULL);
56 }
57
58 #  else
59
60 /* An index to thread-local storage.  */
61 static DWORD tls_index;
62 static int tls_initialized /* = 0 */;
63
64 /* Used as a fallback only.  */
65 static struct gl_msvc_inval_per_thread not_per_thread;
66
67 struct gl_msvc_inval_per_thread *
68 gl_msvc_inval_current (void)
69 {
70   if (!tls_initialized)
71     {
72       tls_index = TlsAlloc ();
73       tls_initialized = 1;
74     }
75   if (tls_index == TLS_OUT_OF_INDEXES)
76     /* TlsAlloc had failed.  */
77     return &not_per_thread;
78   else
79     {
80       struct gl_msvc_inval_per_thread *pointer =
81         (struct gl_msvc_inval_per_thread *) TlsGetValue (tls_index);
82       if (pointer == NULL)
83         {
84           /* First call.  Allocate a new 'struct gl_msvc_inval_per_thread'.  */
85           pointer =
86             (struct gl_msvc_inval_per_thread *)
87             malloc (sizeof (struct gl_msvc_inval_per_thread));
88           if (pointer == NULL)
89             /* Could not allocate memory.  Use the global storage.  */
90             pointer = &not_per_thread;
91           TlsSetValue (tls_index, pointer);
92         }
93       return pointer;
94     }
95 }
96
97 static void __cdecl
98 gl_msvc_invalid_parameter_handler (const wchar_t *expression,
99                                    const wchar_t *function,
100                                    const wchar_t *file,
101                                    unsigned int line,
102                                    uintptr_t dummy)
103 {
104   struct gl_msvc_inval_per_thread *current = gl_msvc_inval_current ();
105   if (current->restart_valid)
106     longjmp (current->restart, 1);
107   else
108     /* An invalid parameter notification from outside the gnulib code.
109        Give the caller a chance to intervene.  */
110     RaiseException (STATUS_GNULIB_INVALID_PARAMETER, 0, 0, NULL);
111 }
112
113 #  endif
114
115 # endif
116
117 static int gl_msvc_inval_initialized /* = 0 */;
118
119 void
120 gl_msvc_inval_ensure_handler (void)
121 {
122   if (gl_msvc_inval_initialized == 0)
123     {
124       _set_invalid_parameter_handler (gl_msvc_invalid_parameter_handler);
125       gl_msvc_inval_initialized = 1;
126     }
127 }
128
129 #endif