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-/* Invalid parameter handler for MSVC runtime libraries.
- Copyright (C) 2011-2012 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3, or (at your option)
- any later version.
-
- This program 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 General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, see <http://www.gnu.org/licenses/>. */
-
-#ifndef _MSVC_INVAL_H
-#define _MSVC_INVAL_H
-
-/* With MSVC runtime libraries with the "invalid parameter handler" concept,
- functions like fprintf(), dup2(), or close() crash when the caller passes
- an invalid argument. But POSIX wants error codes (such as EINVAL or EBADF)
- instead.
- This file defines macros that turn such an invalid parameter notification
- into a non-local exit. An error code can then be produced at the target
- of this exit. You can thus write code like
-
- TRY_MSVC_INVAL
- {
- <Code that can trigger an invalid parameter notification
- but does not do 'return', 'break', 'continue', nor 'goto'.>
- }
- CATCH_MSVC_INVAL
- {
- <Code that handles an invalid parameter notification
- but does not do 'return', 'break', 'continue', nor 'goto'.>
- }
- DONE_MSVC_INVAL;
-
- This entire block expands to a single statement.
-
- The handling of invalid parameters can be done in three ways:
-
- * The default way, which is reasonable for programs (not libraries):
- AC_DEFINE([MSVC_INVALID_PARAMETER_HANDLING], [DEFAULT_HANDLING])
-
- * The way for libraries that make "hairy" calls (like close(-1), or
- fclose(fp) where fileno(fp) is closed, or simply getdtablesize()):
- AC_DEFINE([MSVC_INVALID_PARAMETER_HANDLING], [HAIRY_LIBRARY_HANDLING])
-
- * The way for libraries that make no "hairy" calls:
- AC_DEFINE([MSVC_INVALID_PARAMETER_HANDLING], [SANE_LIBRARY_HANDLING])
- */
-
-#define DEFAULT_HANDLING 0
-#define HAIRY_LIBRARY_HANDLING 1
-#define SANE_LIBRARY_HANDLING 2
-
-#if HAVE_MSVC_INVALID_PARAMETER_HANDLER \
- && !(MSVC_INVALID_PARAMETER_HANDLING == SANE_LIBRARY_HANDLING)
-/* A native Windows platform with the "invalid parameter handler" concept,
- and either DEFAULT_HANDLING or HAIRY_LIBRARY_HANDLING. */
-
-# if MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
-/* Default handling. */
-
-# ifdef __cplusplus
-extern "C" {
-# endif
-
-/* Ensure that the invalid parameter handler in installed that just returns.
- Because we assume no other part of the program installs a different
- invalid parameter handler, this solution is multithread-safe. */
-extern void gl_msvc_inval_ensure_handler (void);
-
-# ifdef __cplusplus
-}
-# endif
-
-# define TRY_MSVC_INVAL \
- do \
- { \
- gl_msvc_inval_ensure_handler (); \
- if (1)
-# define CATCH_MSVC_INVAL \
- else
-# define DONE_MSVC_INVAL \
- } \
- while (0)
-
-# else
-/* Handling for hairy libraries. */
-
-# include <excpt.h>
-
-/* Gnulib can define its own status codes, as described in the page
- "Raising Software Exceptions" on microsoft.com
- <http://msdn.microsoft.com/en-us/library/het71c37.aspx>.
- Our status codes are composed of
- - 0xE0000000, mandatory for all user-defined status codes,
- - 0x474E550, a API identifier ("GNU"),
- - 0, 1, 2, ..., used to distinguish different status codes from the
- same API. */
-# define STATUS_GNULIB_INVALID_PARAMETER (0xE0000000 + 0x474E550 + 0)
-
-# if defined _MSC_VER
-/* A compiler that supports __try/__except, as described in the page
- "try-except statement" on microsoft.com
- <http://msdn.microsoft.com/en-us/library/s58ftw19.aspx>.
- With __try/__except, we can use the multithread-safe exception handling. */
-
-# ifdef __cplusplus
-extern "C" {
-# endif
-
-/* Ensure that the invalid parameter handler in installed that raises a
- software exception with code STATUS_GNULIB_INVALID_PARAMETER.
- Because we assume no other part of the program installs a different
- invalid parameter handler, this solution is multithread-safe. */
-extern void gl_msvc_inval_ensure_handler (void);
-
-# ifdef __cplusplus
-}
-# endif
-
-# define TRY_MSVC_INVAL \
- do \
- { \
- gl_msvc_inval_ensure_handler (); \
- __try
-# define CATCH_MSVC_INVAL \
- __except (GetExceptionCode () == STATUS_GNULIB_INVALID_PARAMETER \
- ? EXCEPTION_EXECUTE_HANDLER \
- : EXCEPTION_CONTINUE_SEARCH)
-# define DONE_MSVC_INVAL \
- } \
- while (0)
-
-# else
-/* Any compiler.
- We can only use setjmp/longjmp. */
-
-# include <setjmp.h>
-
-# ifdef __cplusplus
-extern "C" {
-# endif
-
-struct gl_msvc_inval_per_thread
-{
- /* The restart that will resume execution at the code between
- CATCH_MSVC_INVAL and DONE_MSVC_INVAL. It is enabled only between
- TRY_MSVC_INVAL and CATCH_MSVC_INVAL. */
- jmp_buf restart;
-
- /* Tells whether the contents of restart is valid. */
- int restart_valid;
-};
-
-/* Ensure that the invalid parameter handler in installed that passes
- control to the gl_msvc_inval_restart if it is valid, or raises a
- software exception with code STATUS_GNULIB_INVALID_PARAMETER otherwise.
- Because we assume no other part of the program installs a different
- invalid parameter handler, this solution is multithread-safe. */
-extern void gl_msvc_inval_ensure_handler (void);
-
-/* Return a pointer to the per-thread data for the current thread. */
-extern struct gl_msvc_inval_per_thread *gl_msvc_inval_current (void);
-
-# ifdef __cplusplus
-}
-# endif
-
-# define TRY_MSVC_INVAL \
- do \
- { \
- struct gl_msvc_inval_per_thread *msvc_inval_current; \
- gl_msvc_inval_ensure_handler (); \
- msvc_inval_current = gl_msvc_inval_current (); \
- /* First, initialize gl_msvc_inval_restart. */ \
- if (setjmp (msvc_inval_current->restart) == 0) \
- { \
- /* Then, mark it as valid. */ \
- msvc_inval_current->restart_valid = 1;
-# define CATCH_MSVC_INVAL \
- /* Execution completed. \
- Mark gl_msvc_inval_restart as invalid. */ \
- msvc_inval_current->restart_valid = 0; \
- } \
- else \
- { \
- /* Execution triggered an invalid parameter notification. \
- Mark gl_msvc_inval_restart as invalid. */ \
- msvc_inval_current->restart_valid = 0;
-# define DONE_MSVC_INVAL \
- } \
- } \
- while (0)
-
-# endif
-
-# endif
-
-#else
-/* A platform that does not need to the invalid parameter handler,
- or when SANE_LIBRARY_HANDLING is desired. */
-
-/* The braces here avoid GCC warnings like
- "warning: suggest explicit braces to avoid ambiguous 'else'". */
-# define TRY_MSVC_INVAL \
- do \
- { \
- if (1)
-# define CATCH_MSVC_INVAL \
- else
-# define DONE_MSVC_INVAL \
- } \
- while (0)
-
-#endif
-
-#endif /* _MSVC_INVAL_H */
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