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comparison lib/intprops.h @ 265:68fbca173508 2.6
Added generated files for release
author | lost |
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date | Tue, 22 Dec 2009 05:31:23 +0000 |
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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) |