diff options
Diffstat (limited to 'REORG.TODO/sysdeps/i386/strlen.c')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/strlen.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/strlen.c b/REORG.TODO/sysdeps/i386/strlen.c new file mode 100644 index 0000000000..0b69957392 --- /dev/null +++ b/REORG.TODO/sysdeps/i386/strlen.c @@ -0,0 +1,35 @@ +/* Determine the length of a string. For Intel 80x86, x>=3. + Copyright (C) 1991-2017 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) |