/* * 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 <andersen@uclibc.org> * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ /* * Modified for uClibc by Erik Andersen <andersen@codepoet.org> * 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 */ #include <string.h> char *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; } libc_hidden_proto(strncat) libc_hidden_def(strncat)