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5929563f | 1 | /* Determine the length of a string. For Intel 80x86, x>=3. |
688903eb | 2 | Copyright (C) 1991-2018 Free Software Foundation, Inc. |
41bdb6e2 | 3 | This file is part of the GNU C Library. |
28f540f4 RM |
4 | Contributed by Torbjorn Granlund (tege@sics.se). |
5 | ||
5929563f | 6 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 10 | |
5929563f UD |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
28f540f4 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 19 | |
28f540f4 RM |
20 | #include <string.h> |
21 | ||
22 | size_t | |
6ed0492f | 23 | strlen (const char *str) |
28f540f4 RM |
24 | { |
25 | int cnt; | |
26 | ||
27 | asm("cld\n" /* Search forward. */ | |
28 | /* Some old versions of gas need `repne' instead of `repnz'. */ | |
29 | "repnz\n" /* Look for a zero byte. */ | |
30 | "scasb" /* %0, %1, %3 */ : | |
31 | "=c" (cnt) : "D" (str), "0" (-1), "a" (0)); | |
32 | ||
33 | return -2 - cnt; | |
34 | } | |
85dd1003 | 35 | libc_hidden_builtin_def (strlen) |