The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/limits.h

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    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  * $FreeBSD: src/sys/i386/include/limits.h,v 1.9.8.1 1999/09/05 08:11:52 peter Exp $
   35  */
   36 
   37 #ifndef _MACHINE_LIMITS_H_
   38 #define _MACHINE_LIMITS_H_
   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  * According to ANSI (section 2.2.4.2), the values below must be usable by
   45  * #if preprocessing directives.  Additionally, the expression must have the
   46  * same type as would an expression that is an object of the corresponding
   47  * type converted according to the integral promotions.  The subtraction for
   48  * INT_MIN and LONG_MIN is so the value is not unsigned; 2147483648 is an
   49  * unsigned int for 32-bit two's complement ANSI compilers (section 3.1.3.2).
   50  * These numbers work for pcc as well.  The UINT_MAX and ULONG_MAX values
   51  * are written as hex so that GCC will be quiet about large integer constants.
   52  */
   53 #define SCHAR_MAX       127             /* min value for a signed char */
   54 #define SCHAR_MIN       (-128)          /* max value for a signed char */
   55 
   56 #define UCHAR_MAX       255             /* max value for an unsigned char */
   57 #define CHAR_MAX        127             /* max value for a char */
   58 #define CHAR_MIN        (-128)          /* min value for a char */
   59 
   60 #define USHRT_MAX       65535           /* max value for an unsigned short */
   61 #define SHRT_MAX        32767           /* max value for a short */
   62 #define SHRT_MIN        (-32768)        /* min value for a short */
   63 
   64 #define UINT_MAX        0xffffffff      /* max value for an unsigned int */
   65 #define INT_MAX         2147483647      /* max value for an int */
   66 #define INT_MIN         (-2147483647-1) /* min value for an int */
   67 
   68 #define ULONG_MAX       0xffffffff      /* max value for an unsigned long */
   69 #define LONG_MAX        2147483647      /* max value for a long */
   70 #define LONG_MIN        (-2147483647-1) /* min value for a long */
   71 
   72 #if !defined(_ANSI_SOURCE)
   73 #define SSIZE_MAX       INT_MAX         /* max value for a ssize_t */
   74 
   75 #if !defined(_POSIX_SOURCE)
   76 #define SIZE_T_MAX      UINT_MAX        /* max value for a size_t */
   77 
   78 /* GCC requires that quad constants be written as expressions. */
   79 #define UQUAD_MAX       ((u_quad_t)0-1) /* max value for a uquad_t */
   80                                         /* max value for a quad_t */
   81 #define QUAD_MAX        ((quad_t)(UQUAD_MAX >> 1))
   82 #define QUAD_MIN        (-QUAD_MAX-1)   /* min value for a quad_t */
   83 
   84 #endif /* !_POSIX_SOURCE */
   85 #endif /* !_ANSI_SOURCE */
   86 
   87 #endif /* !_MACHINE_LIMITS_H_ */

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