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50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* integer_length - find most significant bit in an unsigned integer.
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Copyright (C) 2011-2017 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2011. */
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#ifndef _INTEGER_LENGTH_H
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#define _INTEGER_LENGTH_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* These functions return the minimum number of bits required to represent
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the given unsigned integer.
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For non-zero values, this is the position of the most significant bit
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that is set, plus one. For zero, it is 0. */
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/* Returns the integer length of x.
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The result is >= 0, <= sizeof (unsigned int) * CHAR_BIT. */
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extern int integer_length (unsigned int x);
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/* Returns the integer length of x.
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The result is >= 0, <= sizeof (unsigned long) * CHAR_BIT. */
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extern int integer_length_l (unsigned long x);
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#if HAVE_UNSIGNED_LONG_LONG_INT
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/* Returns the integer length of x.
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The result is >= 0, <= sizeof (unsigned long long) * CHAR_BIT. */
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extern int integer_length_ll (unsigned long long x);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _INTEGER_LENGTH_H */
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