82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2014 Imagination Technologies
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include "string.h"
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/*
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* Alternative string functions to the default ones are added
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* because there is no guarantee that the provided source and
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* destination addresses are properly aligned;
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* The default string functions work with multiple of 4 bytes
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* (sizeof(unsinged long)); MIPS will use LW/SW instructions
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* for these operations and if the source and destination
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* addresses are not aligned it will trigger an exception.
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*/
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void *memcpy(void *dest, const void *src, size_t n)
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{
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u8 *ptr_d = dest;
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const u8 *ptr_s = src;
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size_t i;
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for (i = 0; i < n; i++)
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*ptr_d++ = *ptr_s++;
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return dest;
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}
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void *memmove(void *dest, const void *src, size_t n)
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{
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if ((src < dest) && (dest - src < n)) {
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u8 *ptr_d = dest;
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const u8 *ptr_s = src;
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/* copy backwards */
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while (n--)
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ptr_d[n] = ptr_s[n];
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return dest;
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}
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/* copy forwards */
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return memcpy(dest, src, n);
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}
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void *memset(void *s, int c, size_t n)
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{
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u8 *ptr = s;
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size_t i;
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for (i = 0; i < n; i++)
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*ptr++ = c;
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return s;
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}
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int memcmp(const void *s1, const void *s2, size_t n)
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{
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size_t i;
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for (i = 0; i < n; i++)
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if (((u8 *)s1)[i] != ((u8 *)s2)[i])
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return ((u8 *)s1)[i] - ((u8 *)s2)[i];
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return 0;
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}
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