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string/strchrnul.c
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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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/* Copyright (C) 1991-2026 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 <https://www.gnu.org/licenses/>. */ #include <libc-pointer-arith.h> #include <string-fzb.h> #include <string-fzc.h> #include <string-fzi.h> #include <string-shift.h> #include <string.h> #undef __strchrnul #undef strchrnul #ifdef STRCHRNUL # define __strchrnul STRCHRNUL #endif /* Find the first occurrence of C in S or the final NUL byte. */ char * __strchrnul (const char *str, int c_in) { /* Align pointer to sizeof op_t. */ uintptr_t s_int = (uintptr_t) str; const op_t *word_ptr = (const op_t *) PTR_ALIGN_DOWN (str, sizeof (op_t)); op_t repeated_c = repeat_bytes (c_in); op_t word = *word_ptr; find_t mask = shift_find (find_zero_eq_all (word, repeated_c), s_int); if (mask != 0) return (char *) str + index_first (mask); do word = *++word_ptr; while (! has_zero_eq (word, repeated_c)); return (char *) word_ptr + index_first_zero_eq (word, repeated_c); } #ifndef STRCHRNUL libc_hidden_def (__strchrnul) weak_alias (__strchrnul, strchrnul) #endif