Jit Loon Lim | 012a9d9 | 2025-03-17 16:25:53 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2024-2025, Altera Corporation. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <errno.h> |
| 8 | #include <stddef.h> |
| 9 | #include <string.h> |
| 10 | #include <stdint.h> |
| 11 | |
| 12 | int strcpy_secure(char *restrict dest, size_t dest_size, const char *restrict src) |
| 13 | { |
| 14 | /* Check for null pointers */ |
| 15 | if ((dest == NULL) || (src == NULL)) { |
| 16 | return -EINVAL; |
| 17 | } |
| 18 | |
| 19 | /* Check the destination size valid range */ |
| 20 | if (dest_size == 0) { |
| 21 | return -ERANGE; |
| 22 | } |
| 23 | |
| 24 | /* Calculate the length of the source string */ |
| 25 | size_t src_len = strnlen_secure(src, dest_size); |
| 26 | |
| 27 | /* Check if the source string fits in the destination buffer */ |
| 28 | if (src_len >= dest_size) { |
| 29 | /* Set destination to an empty string */ |
| 30 | dest[0] = '\0'; |
| 31 | return -ERANGE; |
| 32 | } |
| 33 | |
| 34 | /* Copy the source string to the destination */ |
| 35 | for (dest[src_len] = '\0'; src_len > 0; src_len--) { |
| 36 | dest[src_len - 1] = src[src_len - 1]; |
| 37 | } |
| 38 | |
| 39 | return 0; |
| 40 | } |