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dff8da6b | 1 | /* Copyright (C) 1991-2024 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
c84142e8 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 8 | |
c84142e8 UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
28f540f4 | 17 | |
350d8d13 AZ |
18 | #include <libc-pointer-arith.h> |
19 | #include <string-fzb.h> | |
20 | #include <string-fzc.h> | |
21 | #include <string-fzi.h> | |
22 | #include <string-shift.h> | |
28f540f4 RM |
23 | #include <string.h> |
24 | ||
350d8d13 AZ |
25 | #ifdef STRLEN |
26 | # define __strlen STRLEN | |
9472f35a SL |
27 | #endif |
28 | ||
28f540f4 RM |
29 | /* Return the length of the null-terminated string STR. Scan for |
30 | the null terminator quickly by testing four bytes at a time. */ | |
28f540f4 | 31 | size_t |
350d8d13 | 32 | __strlen (const char *str) |
28f540f4 | 33 | { |
350d8d13 AZ |
34 | /* Align pointer to sizeof op_t. */ |
35 | const uintptr_t s_int = (uintptr_t) str; | |
36 | const op_t *word_ptr = (const op_t*) PTR_ALIGN_DOWN (str, sizeof (op_t)); | |
28f540f4 | 37 | |
350d8d13 AZ |
38 | op_t word = *word_ptr; |
39 | find_t mask = shift_find (find_zero_all (word), s_int); | |
40 | if (mask != 0) | |
41 | return index_first (mask); | |
28f540f4 | 42 | |
350d8d13 AZ |
43 | do |
44 | word = *++word_ptr; | |
45 | while (! has_zero (word)); | |
28f540f4 | 46 | |
350d8d13 | 47 | return ((const char *) word_ptr) + index_first_zero (word) - str; |
28f540f4 | 48 | } |
350d8d13 AZ |
49 | #ifndef STRLEN |
50 | weak_alias (__strlen, strlen) | |
85dd1003 | 51 | libc_hidden_builtin_def (strlen) |
350d8d13 | 52 | #endif |