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sysdeps/generic/string-misc.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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/* Miscellaneous functions used in string implementations. 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_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 */