Mercurial > hg-old > index.cgi

comparison lib/intprops.h @ 421:3c2e1f24cc7d 3.0-beta2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added generated files for release
author lost@l-w.ca
date Sun, 19 Sep 2010 01:33:24 -0600
parents
children
comparison
equal deleted inserted replaced
420:7366deedfa85 421:3c2e1f24cc7d
1 /* intprops.h -- properties of integer types
2
3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009, 2010 Free Software
4 Foundation, Inc.
5
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18
19 /* Written by Paul Eggert. */
20
21 #ifndef GL_INTPROPS_H
22 # define GL_INTPROPS_H
23
24 # include <limits.h>
25
26 /* The extra casts in the following macros work around compiler bugs,
27 e.g., in Cray C 5.0.3.0. */
28
29 /* True if the arithmetic type T is an integer type. bool counts as
30 an integer. */
31 # define TYPE_IS_INTEGER(t) ((t) 1.5 == 1)
32
33 /* True if negative values of the signed integer type T use two's
34 complement, ones' complement, or signed magnitude representation,
35 respectively. Much GNU code assumes two's complement, but some
36 people like to be portable to all possible C hosts. */
37 # define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1)
38 # define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0)
39 # define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1)
40
41 /* True if the arithmetic type T is signed. */
42 # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
43
44 /* The maximum and minimum values for the integer type T. These
45 macros have undefined behavior if T is signed and has padding bits.
46 If this is a problem for you, please let us know how to fix it for
47 your host. */
48 # define TYPE_MINIMUM(t) \
49 ((t) (! TYPE_SIGNED (t) \
50 ? (t) 0 \
51 : TYPE_SIGNED_MAGNITUDE (t) \
52 ? ~ (t) 0 \
53 : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))
54 # define TYPE_MAXIMUM(t) \
55 ((t) (! TYPE_SIGNED (t) \
56 ? (t) -1 \
57 : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
58
59 /* Return zero if T can be determined to be an unsigned type.
60 Otherwise, return 1.
61 When compiling with GCC, INT_STRLEN_BOUND uses this macro to obtain a
62 tighter bound. Otherwise, it overestimates the true bound by one byte
63 when applied to unsigned types of size 2, 4, 16, ... bytes.
64 The symbol signed_type_or_expr__ is private to this header file. */
65 # if __GNUC__ >= 2
66 # define signed_type_or_expr__(t) TYPE_SIGNED (__typeof__ (t))
67 # else
68 # define signed_type_or_expr__(t) 1
69 # endif
70
71 /* Bound on length of the string representing an integer type or expression T.
72 Subtract 1 for the sign bit if T is signed; log10 (2.0) < 146/485;
73 add 1 for integer division truncation; add 1 more for a minus sign
74 if needed. */
75 # define INT_STRLEN_BOUND(t) \
76 ((sizeof (t) * CHAR_BIT - signed_type_or_expr__ (t)) * 146 / 485 \
77 + signed_type_or_expr__ (t) + 1)
78
79 /* Bound on buffer size needed to represent an integer type or expression T,
80 including the terminating null. */
81 # define INT_BUFSIZE_BOUND(t) (INT_STRLEN_BOUND (t) + 1)
82
83 #endif /* GL_INTPROPS_H */