/* * This file is part of the libpayload project. * * It has originally been taken from the HelenOS project * (http://www.helenos.eu), and slightly modified for our purposes. * * Copyright (c) 2005 Martin Decky * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include <libpayload.h> static void *default_memset(void *s, int c, size_t n) { size_t i; void *ret = s; unsigned long w = c & 0xff; for (i = 1; i < sizeof(unsigned long); i <<= 1) w = (w << (i * 8)) | w; for (i = 0; i < n / sizeof(unsigned long); i++) ((unsigned long *)s)[i] = w; s += i * sizeof(unsigned long); for (i = 0; i < n % sizeof(unsigned long); i++) ((u8 *)s)[i] = (u8)c; return ret; } void *memset(void *s, int c, size_t n) __attribute__((weak, alias("default_memset"))); static void *default_memcpy(void *dst, const void *src, size_t n) { size_t i; void *ret = dst; for(i = 0; i < n / sizeof(unsigned long); i++) ((unsigned long *)dst)[i] = ((unsigned long *)src)[i]; src += i * sizeof(unsigned long); dst += i * sizeof(unsigned long); for(i = 0; i < n % sizeof(unsigned long); i++) ((u8 *)dst)[i] = ((u8 *)src)[i]; return ret; } void *memcpy(void *dst, const void *src, size_t n) __attribute__((weak, alias("default_memcpy"))); static void *default_memmove(void *dst, const void *src, size_t n) { size_t i, offs; if (src > dst) return memcpy(dst, src, n); offs = n - (n % sizeof(unsigned long)); for (i = (n % sizeof(unsigned long)) - 1; i >= 0; i--) ((u8 *)dst)[i + offs] = ((u8 *)src)[i + offs]; for (i = n / sizeof(unsigned long) - 1; i >= 0; i--) ((unsigned long *)dst)[i] = ((unsigned long *)src)[i]; return dst; } void *memmove(void *dst, const void *src, size_t n) __attribute__((weak, alias("default_memmove"))); /** * Compare two memory areas. * * @param s1 Pointer to the first area to compare. * @param s2 Pointer to the second area to compare. * @param n Size of the first area in bytes (both must have the same length). * @return If n is 0, return zero. Otherwise, return a value less than, equal * to, or greater than zero if s1 is found less than, equal to, or * greater than s2 respectively. */ static int default_memcmp(const void *s1, const void *s2, size_t n) { size_t i; for (i = 0; i < n / sizeof(unsigned long); i++) if (((unsigned long *)s1)[i] != ((unsigned long *)s2)[i]) break; /* fall through to find differing byte */ for (i *= sizeof(unsigned long); i < n; i++) if (((u8 *)s1)[i] != ((u8 *)s2)[i]) return ((u8 *)s1)[i] - ((u8 *)s2)[i]; return 0; } int memcmp(const void *s1, const void *s2, size_t n) __attribute__((weak, alias("default_memcmp")));