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48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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///////////////////////////////////////
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// Implements:
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// void *memcpy(void *s1, const void *s2, size_t n);
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// void *memmove(void *s1, const void *s2, size_t n);
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///////////////////////////////////////
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#include <stddef.h>
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#include <stdint.h>
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void *memcpy(void * restrict s1, const void * restrict s2, size_t n) {
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char *dest = (char*)s1;
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const char *src = (const char*)s2;
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while (n--) {
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*dest++ = *src++;
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}
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return s1;
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}
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void *memmove(void * restrict s1, const void * restrict s2, size_t n) {
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char *dest = (char*)s1;
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const char *src = (const char*)s2;
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if (dest <= src) {
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while (n--) {
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*dest++ = *src++;
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}
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} else {
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while (n--) {
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dest[n] = src[n];
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}
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}
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return s1;
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}
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