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nagios-plugins  1.4.16
intprops.h
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00001 /* intprops.h -- properties of integer types
00002 
00003    Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009, 2010 Free Software
00004    Foundation, Inc.
00005 
00006    This program is free software: you can redistribute it and/or modify
00007    it under the terms of the GNU General Public License as published by
00008    the Free Software Foundation; either version 3 of the License, or
00009    (at your option) any later version.
00010 
00011    This program is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014    GNU General Public License for more details.
00015 
00016    You should have received a copy of the GNU General Public License
00017    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
00018 
00019 /* Written by Paul Eggert.  */
00020 
00021 #ifndef GL_INTPROPS_H
00022 # define GL_INTPROPS_H
00023 
00024 # include <limits.h>
00025 
00026 /* The extra casts in the following macros work around compiler bugs,
00027    e.g., in Cray C 5.0.3.0.  */
00028 
00029 /* True if the arithmetic type T is an integer type.  bool counts as
00030    an integer.  */
00031 # define TYPE_IS_INTEGER(t) ((t) 1.5 == 1)
00032 
00033 /* True if negative values of the signed integer type T use two's
00034    complement, ones' complement, or signed magnitude representation,
00035    respectively.  Much GNU code assumes two's complement, but some
00036    people like to be portable to all possible C hosts.  */
00037 # define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1)
00038 # define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0)
00039 # define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1)
00040 
00041 /* True if the arithmetic type T is signed.  */
00042 # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
00043 
00044 /* The maximum and minimum values for the integer type T.  These
00045    macros have undefined behavior if T is signed and has padding bits.
00046    If this is a problem for you, please let us know how to fix it for
00047    your host.  */
00048 # define TYPE_MINIMUM(t) \
00049   ((t) (! TYPE_SIGNED (t) \
00050         ? (t) 0 \
00051         : TYPE_SIGNED_MAGNITUDE (t) \
00052         ? ~ (t) 0 \
00053         : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))
00054 # define TYPE_MAXIMUM(t) \
00055   ((t) (! TYPE_SIGNED (t) \
00056         ? (t) -1 \
00057         : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
00058 
00059 /* Return zero if T can be determined to be an unsigned type.
00060    Otherwise, return 1.
00061    When compiling with GCC, INT_STRLEN_BOUND uses this macro to obtain a
00062    tighter bound.  Otherwise, it overestimates the true bound by one byte
00063    when applied to unsigned types of size 2, 4, 16, ... bytes.
00064    The symbol signed_type_or_expr__ is private to this header file.  */
00065 # if __GNUC__ >= 2
00066 #  define signed_type_or_expr__(t) TYPE_SIGNED (__typeof__ (t))
00067 # else
00068 #  define signed_type_or_expr__(t) 1
00069 # endif
00070 
00071 /* Bound on length of the string representing an integer type or expression T.
00072    Subtract 1 for the sign bit if T is signed; log10 (2.0) < 146/485;
00073    add 1 for integer division truncation; add 1 more for a minus sign
00074    if needed.  */
00075 # define INT_STRLEN_BOUND(t) \
00076   ((sizeof (t) * CHAR_BIT - signed_type_or_expr__ (t)) * 146 / 485 \
00077    + signed_type_or_expr__ (t) + 1)
00078 
00079 /* Bound on buffer size needed to represent an integer type or expression T,
00080    including the terminating null.  */
00081 # define INT_BUFSIZE_BOUND(t) (INT_STRLEN_BOUND (t) + 1)
00082 
00083 #endif /* GL_INTPROPS_H */