Mercurial > gnulib
view lib/integer_length.h @ 40086:d6de7c427079
stdopen: modernize and simplify
* lib/stdopen.c: Update copyright date
Do not include sys/types.h; no longer needed these days.
(stdopen): Use C99-style decl in loop. Return int errno
value, rather than just a bool. Do not worry about fd mismatches,
since the caller cares only if 0, 1, 2 are occupied.
* lib/stdopen.h: No need to include <stdbool.h>.
* m4/stdopen.m4: Remove.
* modules/stdopen: New file.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Sat, 05 Jan 2019 18:02:32 -0800 |
parents | b06060465f09 |
children |
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/* integer_length - find most significant bit in an unsigned integer. Copyright (C) 2011-2019 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */ /* Written by Bruno Haible <bruno@clisp.org>, 2011. */ #ifndef _INTEGER_LENGTH_H #define _INTEGER_LENGTH_H #ifdef __cplusplus extern "C" { #endif /* These functions return the minimum number of bits required to represent the given unsigned integer. For non-zero values, this is the position of the most significant bit that is set, plus one. For zero, it is 0. */ /* Returns the integer length of x. The result is >= 0, <= sizeof (unsigned int) * CHAR_BIT. */ extern int integer_length (unsigned int x); /* Returns the integer length of x. The result is >= 0, <= sizeof (unsigned long) * CHAR_BIT. */ extern int integer_length_l (unsigned long x); #if HAVE_UNSIGNED_LONG_LONG_INT /* Returns the integer length of x. The result is >= 0, <= sizeof (unsigned long long) * CHAR_BIT. */ extern int integer_length_ll (unsigned long long x); #endif #ifdef __cplusplus } #endif #endif /* _INTEGER_LENGTH_H */