1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2024, Synopsys Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
17 *
18 * 3. Neither the name of the copyright holder nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35 #define __STDC_WANT_LIB_EXT1__ 1
36 #include <string.h>
37 #include <stdbool.h>
38 #include <errno.h>
39 #include "string_private.h"
40
41 /* C11 version; required by LLVM's C++11 library */
42 __errno_t
strerror_s(char * buf,rsize_t buflen,__errno_t errnum)43 strerror_s(char *buf, rsize_t buflen, __errno_t errnum)
44 {
45 int32_t result = 0;
46 const char *msg = "";
47
48 if (buf == NULL) {
49 msg = "strerror_s: dest is NULL";
50 goto handle_error;
51 }
52
53 if ((buflen == 0u) || (CHECK_RSIZE(buflen))) {
54 msg = "strerror_s: dest buffer size is 0 or exceeds RSIZE_MAX";
55 goto handle_error;
56 }
57
58 const char *cp = _strerror_r(errnum, 0, NULL);
59 uint32_t len = strnlen_s(cp, MAX_ERROR_MSG);
60
61 if (len < buflen) {
62 (void)strncpy(buf, cp, MAX_ERROR_MSG);
63 } else {
64 /* Standard allows truncation of error message with '...' to
65 indicate truncation. */
66 (void)memcpy(buf, cp, (buflen - 1u));
67 buf[(buflen - 1u)] = '\0';
68
69 if (buflen > 3u) {
70 (void)strncpy(&buf[(buflen - 4u)], "...", 4u);
71 }
72
73 result = ERANGE;
74 }
75
76 // Normal return path
77 return result;
78
79 handle_error:
80 if (__cur_handler != NULL) {
81 __cur_handler(msg, NULL, -1);
82 }
83
84 return -1;
85 }
86
