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sysdeps/generic/string-shift.h
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Paul Eggert
Update copyright dates with scripts/update-copyrights
02 янв 2026, 00:42
02 янв 2026, 00:42
66f3e92
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/* Shift unaligned word read Generic C version. Copyright (C) 2023-2026 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_SHIFT_H #define _STRING_SHIFT_H 1 #include <endian.h> #include <limits.h> #include <stdint.h> #include <string-fza.h> /* Return the mask WORD shifted based on S_INT address value, to ignore values not presented in the aligned word read. */ static __always_inline find_t shift_find (find_t word, uintptr_t s) { if (__BYTE_ORDER == __LITTLE_ENDIAN) return word >> (CHAR_BIT * (s % sizeof (op_t))); else return word << (CHAR_BIT * (s % sizeof (op_t))); } /* Mask off the bits defined for the S alignment value, or return WORD if S is 0. */ static __always_inline find_t shift_find_last (find_t word, uintptr_t s) { s = s % sizeof (op_t); if (s == 0) return word; if (__BYTE_ORDER == __LITTLE_ENDIAN) return word & ~(((op_t)-1) << (s * CHAR_BIT)); else return word & ~(((op_t)-1) >> (s * CHAR_BIT)); } #endif /* _STRING_SHIFT_H */