blob: e71aad4f7639c200048103d3348a30188f3322e3 [file] [log] [blame]
lh9ed821d2023-04-07 01:36:19 -07001/*
2 * This string-include defines all string functions as inline
3 * functions. Use gcc. It also assumes ds=es=data space, this should be
4 * normal. Most of the string-functions are rather heavily hand-optimized,
5 * see especially strtok,strstr,str[c]spn. They should work, but are not
6 * very easy to understand. Everything is done entirely within the register
7 * set, making the functions fast and clean. String instructions have been
8 * used through-out, making for "slightly" unclear code :-)
9 *
10 * NO Copyright (C) 1991, 1992 Linus Torvalds,
11 * consider these trivial functions to be PD.
12 */
13
14/*
15 * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
16 *
17 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
18 */
19
20/*
21 * Modified for uClibc by Erik Andersen <andersen@codepoet.org>
22 * These make no attempt to use nifty things like mmx/3dnow/etc.
23 * These are not inline, and will therefore not be as fast as
24 * modifying the headers to use inlines (and cannot therefore
25 * do tricky things when dealing with const memory). But they
26 * should (I hope!) be faster than their generic equivalents....
27 *
28 * More importantly, these should provide a good example for
29 * others to follow when adding arch specific optimizations.
30 * -Erik
31 */
32
33#include <string.h>
34
35char *strcat(char * dest, const char * src)
36{
37 int d0, d1, d2, d3;
38 __asm__ __volatile__(
39 "repne\n\t"
40 "scasb\n\t"
41 "decl %1\n"
42 "1:\tlodsb\n\t"
43 "stosb\n\t"
44 "testb %%al,%%al\n\t"
45 "jne 1b"
46 : "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)
47 : "0" (src), "1" (dest), "2" (0), "3" (0xffffffff):"memory");
48 return dest;
49}
50libc_hidden_def(strcat)