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authorPaul Eggert <eggert@cs.ucla.edu>2005-03-09 19:20:59 +0000
committerPaul Eggert <eggert@cs.ucla.edu>2005-03-09 19:20:59 +0000
commit1c6661af1b63e21ecb731d4f6d91d2e17aaf591c (patch)
treea1f33b2c7a45ecfb9858b1026f1348ab52aa1d95
parenta699754592323c6936ba03b55ff7b13790cd1efc (diff)
downloadcoreutils-1c6661af1b63e21ecb731d4f6d91d2e17aaf591c.tar.xz
Initial revision.
-rw-r--r--lib/intprops.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/lib/intprops.h b/lib/intprops.h
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+/* intprops.h -- properties of integer types
+
+ Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+/* Written by Paul Eggert. */
+
+#include <limits.h>
+
+/* The extra casts in the following macros work around compiler bugs,
+ e.g., in Cray C 5.0.3.0. */
+
+/* True if the arithmetic type T is an integer type. bool counts as
+ an integer. */
+#define TYPE_IS_INTEGER(t) ((t) 1.5 == 1)
+
+/* True if negative values of the integer type T use twos complement
+ representation. */
+#define TYPE_TWOS_COMPLEMENT(t) ((t) - (t) 1 == (t) ((t) ~ (t) 1 + (t) 1))
+
+/* True if the arithmetic type T is signed. */
+#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
+
+/* The maximum and minimum values for the integer type T. These
+ macros have undefined behavior if T is signed and has padding bits
+ (i.e., bits that do not contribute to the value), or if T uses
+ signed-magnitude representation. If this is a problem for you,
+ please let us know how to fix it for your host. */
+#define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
+ ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
+#define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
+
+/* Bound on length of the string representing an integer value or type T.
+ Subtract 1 for the sign bit if t is signed; log10 (2.0) < 146/485;
+ add 1 for integer division truncation; add 1 more for a minus sign
+ if needed. */
+#define INT_STRLEN_BOUND(t) \
+ ((sizeof (t) * CHAR_BIT - 1) * 146 / 485 + 2)
+
+/* Bound on buffer size needed to represent an integer value or type T,
+ including the terminating null. */
+#define INT_BUFSIZE_BOUND(t) (INT_STRLEN_BOUND (t) + 1)