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/strncat.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 libc/string/i386/strncat.c (limited to 'libc/string/i386/strncat.c') diff --git a/libc/string/i386/strncat.c b/libc/string/i386/strncat.c new file mode 100644 index 000000000..39a22766d --- /dev/null +++ b/libc/string/i386/strncat.c @@ -0,0 +1,62 @@ +/* + * 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 + +char attribute_hidden *__strncat(char * dest, + const char * src, size_t count) +{ + int d0, d1, d2, d3; + __asm__ __volatile__( + "repne\n\t" + "scasb\n\t" + "decl %1\n\t" + "movl %8,%3\n" + "incl %3\n" + "1:\tdecl %3\n\t" + "jz 2f\n" + "lodsb\n\t" + "stosb\n\t" + "testb %%al,%%al\n\t" + "jne 1b\n" + "jmp 3f\n" + "2:\txorl %2,%2\n\t" + "stosb\n" + "3:" + : "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3) + : "0" (src),"1" (dest),"2" (0),"3" (0xffffffff), "g" (count) + : "memory"); + return dest; +} + +strong_alias(__strncat, strncat) -- cgit v1.2.3