| /* |
| * 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 strchr |
| char *strchr(const char *s, int c) |
| { |
| int esi; |
| register char * eax; |
| __asm__ __volatile__( |
| " movb %%al, %%ah\n" |
| "1: lodsb\n" |
| " cmpb %%ah, %%al\n" |
| " je 2f\n" |
| " testb %%al, %%al\n" |
| " jnz 1b\n" |
| " movl $1, %%esi\n" /* can use shorter xor + inc */ |
| "2: leal -1(%%esi), %%eax\n" |
| : "=a" (eax), "=&S" (esi) |
| : "0" (c), "1" (s) |
| /* no clobbers */ |
| ); |
| return eax; |
| } |
| libc_hidden_def(strchr) |
| #ifdef __UCLIBC_SUSV3_LEGACY__ |
| strong_alias(strchr,index) |
| #endif |