| /* Determine the length of a string. For Intel 80x86, x>=3. |
| Copyright (C) 1991-2016 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Torbjorn Granlund (tege@sics.se). |
| |
| 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/>. */ |
| |
| #include <string.h> |
| |
| size_t |
| strlen (const char *str) |
| { |
| int cnt; |
| |
| asm("cld\n" /* Search forward. */ |
| /* Some old versions of gas need `repne' instead of `repnz'. */ |
| "repnz\n" /* Look for a zero byte. */ |
| "scasb" /* %0, %1, %3 */ : |
| "=c" (cnt) : "D" (str), "0" (-1), "a" (0)); |
| |
| return -2 - cnt; |
| } |
| libc_hidden_builtin_def (strlen) |