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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include <string.h>
#include <sys/param.h>
#include "utils/s2n_str.h"
char *s2n_strcpy(char *buf, char *last, const char *str) {
/* CBMC pointer checks need to be disabled to compare buf and last for
* the case where they are the same. */
#pragma CPROVER check push
#pragma CPROVER check disable "pointer"
if (buf >= last) {
return buf;
}
#pragma CPROVER check pop
if (NULL == str) {
*buf = '\0';
return buf;
}
/* Free bytes needs to be one byte smaller than size of a storage,
* as strncpy always writes '\0', but doesn't include it in n
*/
size_t bytes_to_copy = MIN(last - buf - 1, strlen(str));
char *p = buf;
if (bytes_to_copy > 0) {
p = (char *)memcpy(buf, str, bytes_to_copy) + bytes_to_copy;
}
*p = '\0';
return p;
}
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