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author | Paul Eggert <eggert@cs.ucla.edu> | 2005-03-09 19:20:59 +0000 |
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committer | Paul Eggert <eggert@cs.ucla.edu> | 2005-03-09 19:20:59 +0000 |
commit | 1c6661af1b63e21ecb731d4f6d91d2e17aaf591c (patch) | |
tree | a1f33b2c7a45ecfb9858b1026f1348ab52aa1d95 /lib | |
parent | a699754592323c6936ba03b55ff7b13790cd1efc (diff) | |
download | coreutils-1c6661af1b63e21ecb731d4f6d91d2e17aaf591c.tar.xz |
Initial revision.
Diffstat (limited to 'lib')
-rw-r--r-- | lib/intprops.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/lib/intprops.h b/lib/intprops.h new file mode 100644 index 000000000..cd1c17212 --- /dev/null +++ b/lib/intprops.h @@ -0,0 +1,55 @@ +/* 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) |