mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/* Miscellaneous functions used in string implementations. Generic C version.
|
|
Copyright (C) 2023-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _STRING_MISC_H
|
|
#define _STRING_MISC_H 1
|
|
|
|
#include <limits.h>
|
|
#include <endian.h>
|
|
#include <string-optype.h>
|
|
|
|
/* Extract the byte at index IDX from word X, with index 0 being the
|
|
least significant byte. */
|
|
static __always_inline unsigned char
|
|
extractbyte (op_t x, unsigned int idx)
|
|
{
|
|
if (__BYTE_ORDER == __LITTLE_ENDIAN)
|
|
return x >> (idx * CHAR_BIT);
|
|
else
|
|
return x >> (sizeof (x) - 1 - idx) * CHAR_BIT;
|
|
}
|
|
|
|
/* Setup an word with each byte being c_in. For instance, on a 64 bits
|
|
machine with input as 0xce the functions returns 0xcececececececece. */
|
|
static __always_inline op_t
|
|
repeat_bytes (unsigned char c_in)
|
|
{
|
|
return ((op_t)-1 / 0xff) * c_in;
|
|
}
|
|
|
|
#endif /* _STRING_MISC_H */
|