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Annotation of embedaddon/libiconv/srclib/intprops.h, revision 1.1

1.1     ! misho       1: /* intprops.h -- properties of integer types
        !             2: 
        !             3:    Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
        !             4: 
        !             5:    This program is free software: you can redistribute it and/or modify
        !             6:    it under the terms of the GNU General Public License as published by
        !             7:    the Free Software Foundation; either version 3 of the License, or
        !             8:    (at your option) any later version.
        !             9: 
        !            10:    This program is distributed in the hope that it will be useful,
        !            11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            13:    GNU General Public License for more details.
        !            14: 
        !            15:    You should have received a copy of the GNU General Public License
        !            16:    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
        !            17: 
        !            18: /* Written by Paul Eggert.  */
        !            19: 
        !            20: #include <limits.h>
        !            21: 
        !            22: /* The extra casts in the following macros work around compiler bugs,
        !            23:    e.g., in Cray C 5.0.3.0.  */
        !            24: 
        !            25: /* True if the arithmetic type T is an integer type.  bool counts as
        !            26:    an integer.  */
        !            27: #define TYPE_IS_INTEGER(t) ((t) 1.5 == 1)
        !            28: 
        !            29: /* True if negative values of the signed integer type T use two's
        !            30:    complement, ones' complement, or signed magnitude representation,
        !            31:    respectively.  Much GNU code assumes two's complement, but some
        !            32:    people like to be portable to all possible C hosts.  */
        !            33: #define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1)
        !            34: #define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0)
        !            35: #define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1)
        !            36: 
        !            37: /* True if the arithmetic type T is signed.  */
        !            38: #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
        !            39: 
        !            40: /* The maximum and minimum values for the integer type T.  These
        !            41:    macros have undefined behavior if T is signed and has padding bits.
        !            42:    If this is a problem for you, please let us know how to fix it for
        !            43:    your host.  */
        !            44: #define TYPE_MINIMUM(t) \
        !            45:   ((t) (! TYPE_SIGNED (t) \
        !            46:        ? (t) 0 \
        !            47:        : TYPE_SIGNED_MAGNITUDE (t) \
        !            48:        ? ~ (t) 0 \
        !            49:        : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))
        !            50: #define TYPE_MAXIMUM(t) \
        !            51:   ((t) (! TYPE_SIGNED (t) \
        !            52:        ? (t) -1 \
        !            53:        : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
        !            54: 
        !            55: /* Return zero if T can be determined to be an unsigned type.
        !            56:    Otherwise, return 1.
        !            57:    When compiling with GCC, INT_STRLEN_BOUND uses this macro to obtain a
        !            58:    tighter bound.  Otherwise, it overestimates the true bound by one byte
        !            59:    when applied to unsigned types of size 2, 4, 16, ... bytes.
        !            60:    The symbol signed_type_or_expr__ is private to this header file.  */
        !            61: #if __GNUC__ >= 2
        !            62: # define signed_type_or_expr__(t) TYPE_SIGNED (__typeof__ (t))
        !            63: #else
        !            64: # define signed_type_or_expr__(t) 1
        !            65: #endif
        !            66: 
        !            67: /* Bound on length of the string representing an integer type or expression T.
        !            68:    Subtract 1 for the sign bit if T is signed; log10 (2.0) < 146/485;
        !            69:    add 1 for integer division truncation; add 1 more for a minus sign
        !            70:    if needed.  */
        !            71: #define INT_STRLEN_BOUND(t) \
        !            72:   ((sizeof (t) * CHAR_BIT - signed_type_or_expr__ (t)) * 146 / 485 \
        !            73:    + signed_type_or_expr__ (t) + 1)
        !            74: 
        !            75: /* Bound on buffer size needed to represent an integer type or expression T,
        !            76:    including the terminating null.  */
        !            77: #define INT_BUFSIZE_BOUND(t) (INT_STRLEN_BOUND (t) + 1)