/* * 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> #undef strncmp int strncmp(const char *cs, const char *ct, size_t count) { int eax; int esi, edi, ecx; __asm__ __volatile__( " incl %%ecx\n" "1: decl %%ecx\n" " jz 2f\n" " lodsb\n" " scasb\n" " jne 3f\n" " testb %%al, %%al\n" " jnz 1b\n" "2: xorl %%eax, %%eax\n" " jmp 4f\n" "3: sbbl %%eax, %%eax\n" " orb $1, %%al\n" "4:\n" : "=a" (eax), "=&S" (esi), "=&D" (edi), "=&c" (ecx) : "1" (cs), "2" (ct), "3" (count) ); return eax; } libc_hidden_weak(strncmp)