POK
/home/jaouen/pok_official/pok/trunk/libpok/libc/string/x86/strlen.c
00001 /*
00002  *                               POK header
00003  * 
00004  * The following file is a part of the POK project. Any modification should
00005  * made according to the POK licence. You CANNOT use this file or a part of
00006  * this file is this part of a file for your own project
00007  *
00008  * For more information on the POK licence, please see our LICENCE FILE
00009  *
00010  * Please follow the coding guidelines described in doc/CODING_GUIDELINES
00011  *
00012  *                                      Copyright (c) 2007-2009 POK team 
00013  *
00014  * Created by julien on Thu Jan 15 23:34:13 2009 
00015  */
00016 
00017 
00018 #include <libc/string.h>
00019 
00020 size_t                  strlen(const char *s)
00021 {
00022    int                 d0;
00023    register int        __res;
00024 
00025    __asm__ __volatile__(
00026          "repne\n\t"
00027          "scasb\n\t"
00028          "notl %0\n\t"
00029          "decl %0"
00030          :"=c" (__res), "=&D" (d0) :"1" (s),"a" (0), "0" (0xffffffff));
00031    return __res;
00032 }
00033