223 lines
8.6 KiB
C
223 lines
8.6 KiB
C
/* Invalid parameter handler for MSVC runtime libraries.
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Copyright (C) 2011-2022 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#ifndef _MSVC_INVAL_H
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#define _MSVC_INVAL_H
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/* With MSVC runtime libraries with the "invalid parameter handler" concept,
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functions like fprintf(), dup2(), or close() crash when the caller passes
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an invalid argument. But POSIX wants error codes (such as EINVAL or EBADF)
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instead.
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This file defines macros that turn such an invalid parameter notification
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into a non-local exit. An error code can then be produced at the target
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of this exit. You can thus write code like
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TRY_MSVC_INVAL
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{
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<Code that can trigger an invalid parameter notification
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but does not do 'return', 'break', 'continue', nor 'goto'.>
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}
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CATCH_MSVC_INVAL
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{
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<Code that handles an invalid parameter notification
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but does not do 'return', 'break', 'continue', nor 'goto'.>
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}
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DONE_MSVC_INVAL;
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This entire block expands to a single statement.
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The handling of invalid parameters can be done in three ways:
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* The default way, which is reasonable for programs (not libraries):
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AC_DEFINE([MSVC_INVALID_PARAMETER_HANDLING], [DEFAULT_HANDLING])
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* The way for libraries that make "hairy" calls (like close(-1), or
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fclose(fp) where fileno(fp) is closed, or simply getdtablesize()):
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AC_DEFINE([MSVC_INVALID_PARAMETER_HANDLING], [HAIRY_LIBRARY_HANDLING])
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* The way for libraries that make no "hairy" calls:
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AC_DEFINE([MSVC_INVALID_PARAMETER_HANDLING], [SANE_LIBRARY_HANDLING])
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*/
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#define DEFAULT_HANDLING 0
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#define HAIRY_LIBRARY_HANDLING 1
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#define SANE_LIBRARY_HANDLING 2
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#if HAVE_MSVC_INVALID_PARAMETER_HANDLER \
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&& !(MSVC_INVALID_PARAMETER_HANDLING == SANE_LIBRARY_HANDLING)
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/* A native Windows platform with the "invalid parameter handler" concept,
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and either DEFAULT_HANDLING or HAIRY_LIBRARY_HANDLING. */
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# if MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
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/* Default handling. */
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# ifdef __cplusplus
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extern "C" {
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# endif
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/* Ensure that the invalid parameter handler in installed that just returns.
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Because we assume no other part of the program installs a different
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invalid parameter handler, this solution is multithread-safe. */
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extern void gl_msvc_inval_ensure_handler (void);
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# ifdef __cplusplus
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}
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# endif
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# define TRY_MSVC_INVAL \
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do \
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{ \
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gl_msvc_inval_ensure_handler (); \
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if (1)
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# define CATCH_MSVC_INVAL \
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else
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# define DONE_MSVC_INVAL \
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} \
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while (0)
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# else
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/* Handling for hairy libraries. */
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# include <excpt.h>
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/* Gnulib can define its own status codes, as described in the page
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"Raising Software Exceptions" on microsoft.com
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<https://docs.microsoft.com/en-us/cpp/cpp/raising-software-exceptions>.
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Our status codes are composed of
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- 0xE0000000, mandatory for all user-defined status codes,
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- 0x474E550, a API identifier ("GNU"),
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- 0, 1, 2, ..., used to distinguish different status codes from the
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same API. */
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# define STATUS_GNULIB_INVALID_PARAMETER (0xE0000000 + 0x474E550 + 0)
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# if defined _MSC_VER
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/* A compiler that supports __try/__except, as described in the page
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"try-except statement" on microsoft.com
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<https://docs.microsoft.com/en-us/cpp/cpp/try-except-statement>.
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With __try/__except, we can use the multithread-safe exception handling. */
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# ifdef __cplusplus
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extern "C" {
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# endif
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/* Ensure that the invalid parameter handler in installed that raises a
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software exception with code STATUS_GNULIB_INVALID_PARAMETER.
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Because we assume no other part of the program installs a different
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invalid parameter handler, this solution is multithread-safe. */
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extern void gl_msvc_inval_ensure_handler (void);
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# ifdef __cplusplus
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}
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# endif
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# define TRY_MSVC_INVAL \
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do \
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{ \
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gl_msvc_inval_ensure_handler (); \
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__try
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# define CATCH_MSVC_INVAL \
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__except (GetExceptionCode () == STATUS_GNULIB_INVALID_PARAMETER \
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? EXCEPTION_EXECUTE_HANDLER \
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: EXCEPTION_CONTINUE_SEARCH)
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# define DONE_MSVC_INVAL \
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} \
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while (0)
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# else
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/* Any compiler.
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We can only use setjmp/longjmp. */
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# include <setjmp.h>
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# ifdef __cplusplus
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extern "C" {
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# endif
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struct gl_msvc_inval_per_thread
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{
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/* The restart that will resume execution at the code between
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CATCH_MSVC_INVAL and DONE_MSVC_INVAL. It is enabled only between
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TRY_MSVC_INVAL and CATCH_MSVC_INVAL. */
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jmp_buf restart;
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/* Tells whether the contents of restart is valid. */
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int restart_valid;
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};
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/* Ensure that the invalid parameter handler in installed that passes
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control to the gl_msvc_inval_restart if it is valid, or raises a
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software exception with code STATUS_GNULIB_INVALID_PARAMETER otherwise.
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Because we assume no other part of the program installs a different
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invalid parameter handler, this solution is multithread-safe. */
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extern void gl_msvc_inval_ensure_handler (void);
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/* Return a pointer to the per-thread data for the current thread. */
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extern struct gl_msvc_inval_per_thread *gl_msvc_inval_current (void);
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# ifdef __cplusplus
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}
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# endif
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# define TRY_MSVC_INVAL \
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do \
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{ \
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struct gl_msvc_inval_per_thread *msvc_inval_current; \
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gl_msvc_inval_ensure_handler (); \
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msvc_inval_current = gl_msvc_inval_current (); \
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/* First, initialize gl_msvc_inval_restart. */ \
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if (setjmp (msvc_inval_current->restart) == 0) \
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{ \
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/* Then, mark it as valid. */ \
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msvc_inval_current->restart_valid = 1;
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# define CATCH_MSVC_INVAL \
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/* Execution completed. \
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Mark gl_msvc_inval_restart as invalid. */ \
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msvc_inval_current->restart_valid = 0; \
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} \
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else \
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{ \
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/* Execution triggered an invalid parameter notification. \
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Mark gl_msvc_inval_restart as invalid. */ \
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msvc_inval_current->restart_valid = 0;
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# define DONE_MSVC_INVAL \
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} \
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} \
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while (0)
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# endif
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# endif
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#else
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/* A platform that does not need to the invalid parameter handler,
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or when SANE_LIBRARY_HANDLING is desired. */
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/* The braces here avoid GCC warnings like
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"warning: suggest explicit braces to avoid ambiguous 'else'". */
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# define TRY_MSVC_INVAL \
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do \
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{ \
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if (1)
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# define CATCH_MSVC_INVAL \
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else
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# define DONE_MSVC_INVAL \
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} \
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while (0)
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#endif
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#endif /* _MSVC_INVAL_H */
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