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44 lines
1.2 KiB
C
44 lines
1.2 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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// char *strcpy(char *s1, const char *s2);
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// char *strncpy(char *s1, const char *s2, size_t n);
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///////////////////////////////////////
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// Notes:
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// Tuned for code size.
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#include <stddef.h>
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#include <string.h>
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char *strcpy(char * restrict s1, const char * restrict s2) {
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size_t n = strlen(s2) + 1;
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return memcpy(s1, s2, n);
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}
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char *strncpy(char * restrict s1, const char * restrict s2, size_t n) {
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char *rc = s1;
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size_t strn = strlen(s2) + 1;
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if (strn > n) {
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strn = n;
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}
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memcpy(s1, s2, strn);
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if (n > strn) {
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memset(s1 + strn, '\0', n - strn);
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}
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return rc;
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}
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