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- /* Copyright (C) 1991-2026 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 Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 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
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
- /*
- * ISO C99 Standard: 7.2 Diagnostics <assert.h>
- */
- #ifdef _ASSERT_H
- # undef _ASSERT_H
- # undef assert
- # undef __ASSERT_VOID_CAST
- # ifdef __USE_GNU
- # undef assert_perror
- # endif
- #endif /* assert.h */
- #define _ASSERT_H 1
- #include <features.h>
- #if __GLIBC_USE (ISOC23)
- # ifndef __STDC_VERSION_ASSERT_H__
- # define __STDC_VERSION_ASSERT_H__ 202311L
- # endif
- #endif
- #if defined __cplusplus && __GNUC_PREREQ (2,95)
- # define __ASSERT_VOID_CAST static_cast<void>
- #else
- # define __ASSERT_VOID_CAST (void)
- #endif
- /* C23 makes assert a variadic macro so that expressions with a comma
- not between parentheses, but that would still be valid as a single
- function argument, such as those involving compound literals with a
- comma in the initializer list, can be passed to assert. This
- depends on support for variadic macros (added in C99 and GCC 2.95),
- and on support for _Bool (added in C99 and GCC 3.0) in order to
- validate that only a single expression is passed as an argument,
- and is currently implemented only for C. */
- #if (__GLIBC_USE (ISOC23) \
- && (defined __GNUC__ \
- ? __GNUC_PREREQ (3, 0) \
- : defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L) \
- && !defined __cplusplus)
- # define __ASSERT_VARIADIC 1
- #else
- # define __ASSERT_VARIADIC 0
- #endif
- /* void assert (int expression);
- If NDEBUG is defined, do nothing.
- If not, and EXPRESSION is zero, print an error message and abort. */
- #ifdef NDEBUG
- # if __ASSERT_VARIADIC
- # define assert(...) (__ASSERT_VOID_CAST (0))
- # else
- # define assert(expr) (__ASSERT_VOID_CAST (0))
- # endif
- /* void assert_perror (int errnum);
- If NDEBUG is defined, do nothing. If not, and ERRNUM is not zero, print an
- error message with the error text for ERRNUM and abort.
- (This is a GNU extension.) */
- # ifdef __USE_GNU
- # define assert_perror(errnum) (__ASSERT_VOID_CAST (0))
- # endif
- #else /* Not NDEBUG. */
- __BEGIN_DECLS
- /* This prints an "Assertion failed" message and aborts. */
- extern void __assert_fail (const char *__assertion, const char *__file,
- unsigned int __line, const char *__function)
- __THROW __attribute__ ((__noreturn__)) __COLD;
- /* Likewise, but prints the error text for ERRNUM. */
- extern void __assert_perror_fail (int __errnum, const char *__file,
- unsigned int __line, const char *__function)
- __THROW __attribute__ ((__noreturn__)) __COLD;
- /* The following is not at all used here but needed for standard
- compliance. */
- extern void __assert (const char *__assertion, const char *__file, int __line)
- __THROW __attribute__ ((__noreturn__)) __COLD;
- # if __ASSERT_VARIADIC
- /* This function is not defined and is not called outside of an
- unevaluated sizeof, but serves to verify that the argument to
- assert is a single expression. */
- extern _Bool __assert_single_arg (_Bool);
- # endif
- __END_DECLS
- /* When possible, define assert so that it does not add extra
- parentheses around EXPR. Otherwise, those added parentheses would
- suppress warnings we'd expect to be detected by gcc's -Wparentheses. */
- # if defined __cplusplus
- # if defined __has_builtin
- # if __has_builtin (__builtin_FILE)
- # define __ASSERT_FILE __builtin_FILE ()
- # define __ASSERT_LINE __builtin_LINE ()
- # endif
- # endif
- # if !defined __ASSERT_FILE
- # define __ASSERT_FILE __FILE__
- # define __ASSERT_LINE __LINE__
- # endif
- # define assert(expr) \
- (static_cast <bool> (expr) \
- ? void (0) \
- : __assert_fail (#expr, __ASSERT_FILE, __ASSERT_LINE, \
- __ASSERT_FUNCTION))
- # elif !defined __GNUC__ || defined __STRICT_ANSI__
- # if __ASSERT_VARIADIC
- # define assert(...) \
- (((void) sizeof (__assert_single_arg (__VA_ARGS__)), __VA_ARGS__) \
- ? __ASSERT_VOID_CAST (0) \
- : __assert_fail (#__VA_ARGS__, __FILE__, __LINE__, __ASSERT_FUNCTION))
- # else
- # define assert(expr) \
- ((expr) \
- ? __ASSERT_VOID_CAST (0) \
- : __assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION))
- # endif
- # else
- # if __ASSERT_VARIADIC
- # define assert(...) \
- ((void) sizeof (__assert_single_arg (__VA_ARGS__)), __extension__ ({ \
- if (__VA_ARGS__) \
- ; /* empty */ \
- else \
- __assert_fail (#__VA_ARGS__, __FILE__, __LINE__, __ASSERT_FUNCTION); \
- }))
- # else
- /* The first occurrence of EXPR is not evaluated due to the sizeof,
- but will trigger any pedantic warnings masked by the __extension__
- for the second occurrence. The ternary operator is required to
- support function pointers and bit fields in this context, and to
- suppress the evaluation of variable length arrays. */
- # define assert(expr) \
- ((void) sizeof ((expr) ? 1 : 0), __extension__ ({ \
- if (expr) \
- ; /* empty */ \
- else \
- __assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION); \
- }))
- # endif
- # endif
- # ifdef __USE_GNU
- # define assert_perror(errnum) \
- (!(errnum) \
- ? __ASSERT_VOID_CAST (0) \
- : __assert_perror_fail ((errnum), __FILE__, __LINE__, __ASSERT_FUNCTION))
- # endif
- /* Version 2.4 and later of GCC define a magical variable `__PRETTY_FUNCTION__'
- which contains the name of the function currently being defined.
- This is broken in G++ before version 2.6.
- C9x has a similar variable called __func__, but prefer the GCC one since
- it demangles C++ function names. */
- # if defined __cplusplus ? __GNUC_PREREQ (2, 6) : __GNUC_PREREQ (2, 4)
- # define __ASSERT_FUNCTION __extension__ __PRETTY_FUNCTION__
- # else
- # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
- # define __ASSERT_FUNCTION __func__
- # else
- # define __ASSERT_FUNCTION ((const char *) 0)
- # endif
- # endif
- #endif /* NDEBUG. */
- #if (defined __USE_ISOC11 \
- && (!defined __STDC_VERSION__ \
- || __STDC_VERSION__ <= 201710L \
- || !__GNUC_PREREQ (13, 0)) \
- && !defined __cplusplus)
- # undef static_assert
- # define static_assert _Static_assert
- #endif
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