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Annotation of sys/sys/limits.h, Revision 1.1.1.1

1.1       nbrk        1: /* $OpenBSD: limits.h,v 1.7 2007/05/07 15:29:44 millert Exp $ */
                      2: /*
                      3:  * Copyright (c) 2002 Marc Espie.
                      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:  *
                     14:  * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
                     15:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
                     16:  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
                     17:  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
                     18:  * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
                     19:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
                     20:  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     21:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     22:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     23:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
                     24:  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     25:  */
                     26: #ifndef _SYS_LIMITS_H_
                     27: #define _SYS_LIMITS_H_
                     28:
                     29: #include <sys/cdefs.h>
                     30:
                     31: /* Common definitions for limits.h. */
                     32:
                     33: /*
                     34:  * <machine/internal_types.h> is meant to describe a specific architecture,
                     35:  * but to be a safe include, that doesn't ever define anything that is
                     36:  * user-visible (only typedefs and #define names that stays in the __xxx
                     37:  * namespace).
                     38:  *
                     39:  *   __machine_has_unsigned_chars      (default is signed chars)
                     40:  *   __FLT_xxx/__DBL_xxx               non standard values for floating
                     41:  *                                     points limits.
                     42:  */
                     43: #include <machine/internal_types.h>
                     44:
                     45: /* Legacy */
                     46: #include <machine/limits.h>
                     47:
                     48: #define        CHAR_BIT        8               /* number of bits in a char */
                     49:
                     50: #define        SCHAR_MAX       0x7f            /* max value for a signed char */
                     51: #define SCHAR_MIN      (-0x7f-1)       /* min value for a signed char */
                     52:
                     53: #define        UCHAR_MAX       0xff            /* max value for an unsigned char */
                     54: #ifdef __machine_has_unsigned_chars
                     55: # define CHAR_MIN      0               /* min value for a char */
                     56: # define CHAR_MAX      0xff            /* max value for a char */
                     57: #else
                     58: # define CHAR_MAX      0x7f
                     59: # define CHAR_MIN      (-0x7f-1)
                     60: #endif
                     61:
                     62: #define        USHRT_MAX       0xffff          /* max value for an unsigned short */
                     63: #define        SHRT_MAX        0x7fff          /* max value for a short */
                     64: #define SHRT_MIN        (-0x7fff-1)     /* min value for a short */
                     65:
                     66: #define        UINT_MAX        0xffffffffU     /* max value for an unsigned int */
                     67: #define        INT_MAX         0x7fffffff      /* max value for an int */
                     68: #define        INT_MIN         (-0x7fffffff-1) /* min value for an int */
                     69:
                     70: #ifdef __LP64__
                     71: # define ULONG_MAX     0xffffffffffffffffUL
                     72:                                        /* max value for unsigned long */
                     73: # define LONG_MAX      0x7fffffffffffffffL
                     74:                                        /* max value for a signed long */
                     75: # define LONG_MIN      (-0x7fffffffffffffffL-1)
                     76:                                        /* min value for a signed long */
                     77: #else
                     78: # define ULONG_MAX     0xffffffffUL    /* max value for an unsigned long */
                     79: # define LONG_MAX      0x7fffffffL     /* max value for a long */
                     80: # define LONG_MIN      (-0x7fffffffL-1)/* min value for a long */
                     81: #endif
                     82:
                     83: #if __BSD_VISIBLE || __ISO_C_VISIBLE >= 1999
                     84: # define ULLONG_MAX    0xffffffffffffffffULL
                     85:                                        /* max value for unsigned long long */
                     86: # define LLONG_MAX     0x7fffffffffffffffLL
                     87:                                        /* max value for a signed long long */
                     88: # define LLONG_MIN     (-0x7fffffffffffffffLL-1)
                     89:                                        /* min value for a signed long long */
                     90: #endif
                     91:
                     92: #if __BSD_VISIBLE
                     93: # define UID_MAX       UINT_MAX        /* max value for a uid_t */
                     94: # define GID_MAX       UINT_MAX        /* max value for a gid_t */
                     95: #endif
                     96:
                     97:
                     98: #if __XPG_VISIBLE
                     99: # ifdef __LP64__
                    100: #  define LONG_BIT     64
                    101: # else
                    102: #  define LONG_BIT     32
                    103: # endif
                    104: # define WORD_BIT      32
                    105:
                    106: /* float.h defines these as well */
                    107: # if !defined(DBL_DIG)
                    108: #  if defined(__DBL_DIG)
                    109: #   define DBL_DIG     __DBL_DIG
                    110: #   define DBL_MAX     __DBL_MAX
                    111: #   define DBL_MIN     __DBL_MIN
                    112:
                    113: #   define FLT_DIG     __FLT_DIG
                    114: #   define FLT_MAX     __FLT_MAX
                    115: #   define FLT_MIN     __FLT_MIN
                    116: #  else
                    117: #   define DBL_DIG     15
                    118: #   define DBL_MAX     1.7976931348623157E+308
                    119: #   define DBL_MIN     2.2250738585072014E-308
                    120:
                    121: #   define FLT_DIG     6
                    122: #   define FLT_MAX     3.40282347E+38F
                    123: #   define FLT_MIN     1.17549435E-38F
                    124: #  endif
                    125: # endif
                    126: #endif
                    127:
                    128: #endif