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1 jermar 1 
/*
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 * Copyright (c) 2001-2004 Jakub Jermar
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 * Copyright (c) 2008 Jiri Svoboda
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup generic
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 * @{
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 */
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/**
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 * @file
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 * @brief   Memory string operations.
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 *
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 * This file provides architecture independent functions to manipulate blocks of
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 * memory. These functions are optimized as much as generic functions of this
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 * type can be. However, architectures are free to provide even more optimized
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 * versions of these functions.
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 */
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#include <memstr.h>
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#include <arch/types.h>
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#include <align.h>
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/** Copy block of memory.
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 *
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 * Copy cnt bytes from src address to dst address.  The copying is done
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 * word-by-word and then byte-by-byte.  The source and destination memory areas
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 * cannot overlap.
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 *
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 * @param src       Source address to copy from.
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 * @param dst       Destination address to copy to.
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 * @param cnt       Number of bytes to copy.
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 *
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 * @return      Destination address.
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 */
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void *_memcpy(void *dst, const void *src, size_t cnt)
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{
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    unsigned int i, j;
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    if (ALIGN_UP((uintptr_t) src, sizeof(unative_t)) != (uintptr_t) src ||
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        ALIGN_UP((uintptr_t) dst, sizeof(unative_t)) != (uintptr_t) dst) {
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        for (i = 0; i < cnt; i++)
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            ((uint8_t *) dst)[i] = ((uint8_t *) src)[i];
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    } else {
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        for (i = 0; i < cnt / sizeof(unative_t); i++)
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            ((unative_t *) dst)[i] = ((unative_t *) src)[i];
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        for (j = 0; j < cnt % sizeof(unative_t); j++)
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            ((uint8_t *)(((unative_t *) dst) + i))[j] =
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                ((uint8_t *)(((unative_t *) src) + i))[j];
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    }
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    return (char *) dst;
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}
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/** Move memory block with possible overlapping.
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 *
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 * Copy cnt bytes from src address to dst address. The source and destination
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 * memory areas may overlap.
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 *
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 * @param src       Source address to copy from.
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 * @param dst       Destination address to copy to.
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 * @param cnt       Number of bytes to copy.
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 *
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 * @return      Destination address.
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 */
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void *memmove(void *dst, const void *src, size_t n)
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{
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    const uint8_t *sp;
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    uint8_t *dp;
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    /* Nothing to do? */
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    if (src == dst)
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        return dst;
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    /* Non-overlapping? */
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    if (dst >= src + n || src >= dst + n) {
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        return memcpy(dst, src, n);
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    }
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    /* Which direction? */
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    if (src > dst) {
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        /* Forwards. */
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        sp = src;
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        dp = dst;
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        while (n-- != 0)
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            *dp++ = *sp++;
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    } else {
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        /* Backwards. */
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        sp = src + (n - 1);
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        dp = dst + (n - 1);
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        while (n-- != 0)
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            *dp-- = *sp--;
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    }
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    return dst;
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}
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/** Fill block of memory
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 *
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 * Fill cnt bytes at dst address with the value x.  The filling is done
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 * byte-by-byte.
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 *
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 * @param dst       Destination address to fill.
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 * @param cnt       Number of bytes to fill.
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 * @param x     Value to fill.
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 *
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 */
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void _memsetb(void *dst, size_t cnt, uint8_t x)
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{
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    unsigned int i;
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    uint8_t *p = (uint8_t *) dst;
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    for (i = 0; i < cnt; i++)
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        p[i] = x;
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}
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/** Fill block of memory.
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 *
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 * Fill cnt words at dst address with the value x.  The filling is done
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 * word-by-word.
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 *
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 * @param dst       Destination address to fill.
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 * @param cnt       Number of words to fill.
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 * @param x     Value to fill.
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 *
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 */
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void _memsetw(void *dst, size_t cnt, uint16_t x)
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{
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    unsigned int i;
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    uint16_t *p = (uint16_t *) dst;
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    for (i = 0; i < cnt; i++)
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        p[i] = x;  
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}
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/** @}
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 */