xref: /freebsd/sys/x86/include/_limits.h (revision 29363fb446372cb3f10bc98664e9767c53fbb457)

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef	_MACHINE__LIMITS_H_
#define	_MACHINE__LIMITS_H_

/*
 * According to ANSI (section 2.2.4.2), the values below must be usable by
 * #if preprocessing directives.  Additionally, the expression must have the
 * same type as would an expression that is an object of the corresponding
 * type converted according to the integral promotions.  The subtraction for
 * INT_MIN, etc., is so the value is not unsigned; e.g., 0x80000000 is an
 * unsigned int for 32-bit two's complement ANSI compilers (section 3.1.3.2).
 */

#define	__CHAR_BIT	8		/* number of bits in a char */

#define	__SCHAR_MAX	0x7f		/* max value for a signed char */
#define	__SCHAR_MIN	(-0x7f - 1)	/* min value for a signed char */

#define	__UCHAR_MAX	0xff		/* max value for an unsigned char */

#define	__USHRT_MAX	0xffff		/* max value for an unsigned short */
#define	__SHRT_MAX	0x7fff		/* max value for a short */
#define	__SHRT_MIN	(-0x7fff - 1)	/* min value for a short */

#define	__UINT_MAX	0xffffffff	/* max value for an unsigned int */
#define	__INT_MAX	0x7fffffff	/* max value for an int */
#define	__INT_MIN	(-0x7fffffff - 1)	/* min value for an int */

#ifdef	__LP64__
#define	__ULONG_MAX	0xffffffffffffffff	/* max for an unsigned long */
#define	__LONG_MAX	0x7fffffffffffffff	/* max for a long */
#define	__LONG_MIN	(-0x7fffffffffffffff - 1) /* min for a long */
#else
#define	__ULONG_MAX	0xffffffffUL
#define	__LONG_MAX	0x7fffffffL
#define	__LONG_MIN	(-0x7fffffffL - 1)
#endif

			/* max value for an unsigned long long */
#define	__ULLONG_MAX	0xffffffffffffffffULL
#define	__LLONG_MAX	0x7fffffffffffffffLL	/* max value for a long long */
#define	__LLONG_MIN	(-0x7fffffffffffffffLL - 1)  /* min for a long long */

#ifdef	__LP64__
#define	__SSIZE_MAX	__LONG_MAX	/* max value for a ssize_t */
#define	__SIZE_T_MAX	__ULONG_MAX	/* max value for a size_t */
#define	__OFF_MAX	__LONG_MAX	/* max value for an off_t */
#define	__OFF_MIN	__LONG_MIN	/* min value for an off_t */
/* Quads and longs are the same on the amd64.  Ensure they stay in sync. */
#define	__UQUAD_MAX	__ULONG_MAX	/* max value for a uquad_t */
#define	__QUAD_MAX	__LONG_MAX	/* max value for a quad_t */
#define	__QUAD_MIN	__LONG_MIN	/* min value for a quad_t */
#define	__LONG_BIT	64
#else
#define	__SSIZE_MAX	__INT_MAX
#define	__SIZE_T_MAX	__UINT_MAX
#define	__OFF_MAX	__LLONG_MAX
#define	__OFF_MIN	__LLONG_MIN
#define	__UQUAD_MAX	__ULLONG_MAX
#define	__QUAD_MAX	__LLONG_MAX
#define	__QUAD_MIN	__LLONG_MIN
#define	__LONG_BIT	32
#endif

#define	__WORD_BIT	32

/* Minimum signal stack size. */
#define	__MINSIGSTKSZ	(512 * 4)

#endif /* !_MACHINE__LIMITS_H_ */