_limits.h revision 1817 
1/*
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *	@(#)limits.h	8.3 (Berkeley) 1/4/94
34 * $Id$
35 */
36
37#ifndef _MACHINE_LIMITS_H_
38#define _MACHINE_LIMITS_H_ 1
39
40#define	CHAR_BIT	8		/* number of bits in a char */
41#define	MB_LEN_MAX	6		/* Allow 31 bit UTF2 */
42
43
44#define	CLK_TCK		128		/* ticks per second */
45
46/*
47 * According to ANSI (section 2.2.4.2), the values below must be usable by
48 * #if preprocessing directives.  Additionally, the expression must have the
49 * same type as would an expression that is an object of the corresponding
50 * type converted according to the integral promotions.  The subtraction for
51 * INT_MIN and LONG_MIN is so the value is not unsigned; 2147483648 is an
52 * unsigned int for 32-bit two's complement ANSI compilers (section 3.1.3.2).
53 * These numbers work for pcc as well.  The UINT_MAX and ULONG_MAX values
54 * are written as hex so that GCC will be quiet about large integer constants.
55 */
56#define	SCHAR_MAX	127		/* min value for a signed char */
57#define	SCHAR_MIN	(-128)		/* max value for a signed char */
58
59#define	UCHAR_MAX	255		/* max value for an unsigned char */
60#define	CHAR_MAX	127		/* max value for a char */
61#define	CHAR_MIN	(-128)		/* min value for a char */
62
63#define	USHRT_MAX	65535		/* max value for an unsigned short */
64#define	SHRT_MAX	32767		/* max value for a short */
65#define	SHRT_MIN	(-32768)	/* min value for a short */
66
67#define	UINT_MAX	0xffffffff	/* max value for an unsigned int */
68#define	INT_MAX		2147483647	/* max value for an int */
69#define	INT_MIN		(-2147483647-1)	/* min value for an int */
70
71#define	ULONG_MAX	0xffffffff	/* max value for an unsigned long */
72#define	LONG_MAX	2147483647	/* max value for a long */
73#define	LONG_MIN	(-2147483647-1)	/* min value for a long */
74
75#if !defined(_ANSI_SOURCE)
76#define	SSIZE_MAX	INT_MAX		/* max value for a ssize_t */
77
78#if !defined(_POSIX_SOURCE)
79#define	SIZE_T_MAX	UINT_MAX	/* max value for a size_t */
80
81/* GCC requires that quad constants be written as expressions. */
82#define	UQUAD_MAX	((u_quad_t)0-1)	/* max value for a uquad_t */
83					/* max value for a quad_t */
84#define	QUAD_MAX	((quad_t)(UQUAD_MAX >> 1))
85#define	QUAD_MIN	(-QUAD_MAX-1)	/* min value for a quad_t */
86
87#endif /* !_POSIX_SOURCE */
88#endif /* !_ANSI_SOURCE */
89
90#endif /* _MACHINE_LIMITS_H_ */
91