0545e9dc6d
commit d1edce71135cc6d98c0a4b5729774542b676e769 Author: sophgo-forum-service <forum_service@sophgo.com> Date: Fri Mar 15 16:07:33 2024 +0800 [fix] recommend using ssh method to clone repo. [fix] fix sensor driver repo branch name.
141 lines
2.6 KiB
C
141 lines
2.6 KiB
C
/*
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* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stddef.h> /* size_t */
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#include <limits.h>
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#include <stdint.h>
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#include <string.h>
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/*
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* Compare @len bytes of @s1 and @s2
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*/
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int memcmp(const void *s1, const void *s2, size_t len)
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{
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const unsigned char *s = s1;
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const unsigned char *d = s2;
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unsigned char sc;
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unsigned char dc;
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while (len--) {
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sc = *s++;
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dc = *d++;
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if (sc - dc)
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return (sc - dc);
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}
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return 0;
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}
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/*
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* Move @len bytes from @src to @dst
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*/
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void *memmove(void *dst, const void *src, size_t len)
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{
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/*
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* The following test makes use of unsigned arithmetic overflow to
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* more efficiently test the condition !(src <= dst && dst < str+len).
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* It also avoids the situation where the more explicit test would give
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* incorrect results were the calculation str+len to overflow (though
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* that issue is probably moot as such usage is probably undefined
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* behaviour and a bug anyway.
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*/
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if ((size_t)dst - (size_t)src >= len) {
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/* destination not in source data, so can safely use memcpy */
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return memcpy(dst, src, len);
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} else {
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/* copy backwards... */
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const char *end = dst;
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const char *s = (const char *)src + len;
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char *d = (char *)dst + len;
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while (d != end)
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*--d = *--s;
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}
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return dst;
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}
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/*
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* Scan @len bytes of @src for value @c
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*/
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void *memchr(const void *src, int c, size_t len)
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{
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const char *s = src;
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while (len--) {
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if (*s == c)
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return (void *) s;
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s++;
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}
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return NULL;
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}
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void *_memcpy(void *dst, const void *src, size_t len)
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{
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const char *s = src;
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char *d = dst;
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while (len--)
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*d++ = *s++;
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return dst;
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}
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#define SS (sizeof(size_t))
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#define ALIGN (sizeof(size_t)-1)
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#define ONES ((size_t)-1/UCHAR_MAX)
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/*
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* Fill @count bytes of memory pointed to by @dst with @val
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*/
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void *memset(void *dest, int c, size_t n)
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{
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unsigned char *s = dest;
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c = (unsigned char)c;
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for (; ((uintptr_t)s & ALIGN) && n; n--)
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*s++ = c;
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if (n) {
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size_t *w, k = ONES * c;
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for (w = (void *)s; n >= SS; n -= SS, w++)
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*w = k;
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for (s = (void *)w; n; n--, s++)
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*s = c;
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}
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return dest;
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}
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/*
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* Copy @len bytes from @src to @dst
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*/
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void *memcpy(void *restrict dest, const void *restrict src, size_t n)
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{
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unsigned char *d = dest;
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const unsigned char *s = src;
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if (((uintptr_t)d & ALIGN) != ((uintptr_t)s & ALIGN))
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goto misaligned;
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for (; ((uintptr_t)d & ALIGN) && n; n--)
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*d++ = *s++;
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if (n) {
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size_t *wd = (void *)d;
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const size_t *ws = (const void *)s;
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for (; n >= SS; n -= SS)
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*wd++ = *ws++;
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d = (void *)wd;
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s = (const void *)ws;
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misaligned:
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for (; n; n--)
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*d++ = *s++;
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}
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return dest;
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}
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