From 0b09d1e5ed195662e8df3246ca4cc450947cc0f8 Mon Sep 17 00:00:00 2001 From: "Peter S. Mazinger" Date: Fri, 11 Nov 2005 22:41:52 +0000 Subject: Split up string.c, make internals hidden --- libc/string/i386/strnlen.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 libc/string/i386/strnlen.c (limited to 'libc/string/i386/strnlen.c') diff --git a/libc/string/i386/strnlen.c b/libc/string/i386/strnlen.c new file mode 100644 index 000000000..be7ace51d --- /dev/null +++ b/libc/string/i386/strnlen.c @@ -0,0 +1,55 @@ +/* + * This string-include defines all string functions as inline + * functions. Use gcc. It also assumes ds=es=data space, this should be + * normal. Most of the string-functions are rather heavily hand-optimized, + * see especially strtok,strstr,str[c]spn. They should work, but are not + * very easy to understand. Everything is done entirely within the register + * set, making the functions fast and clean. String instructions have been + * used through-out, making for "slightly" unclear code :-) + * + * NO Copyright (C) 1991, 1992 Linus Torvalds, + * consider these trivial functions to be PD. + */ + +/* + * Copyright (C) 2000-2005 Erik Andersen + * + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +/* + * Modified for uClibc by Erik Andersen + * These make no attempt to use nifty things like mmx/3dnow/etc. + * These are not inline, and will therefore not be as fast as + * modifying the headers to use inlines (and cannot therefore + * do tricky things when dealing with const memory). But they + * should (I hope!) be faster than their generic equivalents.... + * + * More importantly, these should provide a good example for + * others to follow when adding arch specific optimizations. + * -Erik + */ + +#define _GNU_SOURCE +#include + +size_t attribute_hidden __strnlen(const char *s, size_t count) +{ + int d0; + register int __res; + __asm__ __volatile__( + "movl %2,%0\n\t" + "incl %1\n" + "jmp 2f\n" + "1:\tcmpb $0,(%0)\n\t" + "je 3f\n\t" + "incl %0\n" + "2:\tdecl %1\n\t" + "jne 1b\n" + "3:\tsubl %2,%0" + :"=a" (__res), "=&d" (d0) + :"c" (s),"1" (count)); + return __res; +} + +strong_alias(__strnlen, strnlen) -- cgit v1.2.3