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46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/* Miscellaneous functions used in string implementations. Generic C version.
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Copyright (C) 2023-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _STRING_MISC_H
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#define _STRING_MISC_H 1
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#include <limits.h>
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#include <endian.h>
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#include <string-optype.h>
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/* Extract the byte at index IDX from word X, with index 0 being the
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least significant byte. */
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static __always_inline unsigned char
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extractbyte (op_t x, unsigned int idx)
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{
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if (__BYTE_ORDER == __LITTLE_ENDIAN)
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return x >> (idx * CHAR_BIT);
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else
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return x >> (sizeof (x) - 1 - idx) * CHAR_BIT;
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}
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/* Setup an word with each byte being c_in. For instance, on a 64 bits
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machine with input as 0xce the functions returns 0xcececececececece. */
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static __always_inline op_t
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repeat_bytes (unsigned char c_in)
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{
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return ((op_t)-1 / 0xff) * c_in;
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}
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#endif /* _STRING_MISC_H */
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