1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* util/support/strerror_r.c - strerror_r compatibility shim */
3 /*
4 * Copyright (C) 2014 by the Massachusetts Institute of Technology.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
23 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
24 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
25 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
26 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
28 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
30 * OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <k5-platform.h>
34 #undef strerror_r
35
36 #if defined(_WIN32)
37
38 /* Implement strerror_r in terms of strerror_s. */
39 int
k5_strerror_r(int errnum,char * buf,size_t buflen)40 k5_strerror_r(int errnum, char *buf, size_t buflen)
41 {
42 int st;
43
44 st = strerror_s(buf, buflen, errnum);
45 if (st != 0) {
46 errno = st;
47 return -1;
48 }
49 return 0;
50 }
51
52 #elif !defined(HAVE_STRERROR_R)
53
54 /* Implement strerror_r in terms of strerror (not thread-safe). */
55 int
k5_strerror_r(int errnum,char * buf,size_t buflen)56 k5_strerror_r(int errnum, char *buf, size_t buflen)
57 {
58 if (strlcpy(buf, strerror(errnum), buflen) >= buflen) {
59 errno = ERANGE;
60 return -1;
61 }
62 return 0;
63 }
64
65 #elif defined(STRERROR_R_CHAR_P)
66
67 /*
68 * Implement the POSIX strerror_r API in terms of the GNU strerror_r, which
69 * returns a pointer to either the caller buffer or a constant string. This is
70 * the default version on glibc systems when _GNU_SOURCE is defined.
71 */
72 int
k5_strerror_r(int errnum,char * buf,size_t buflen)73 k5_strerror_r(int errnum, char *buf, size_t buflen)
74 {
75 const char *str;
76
77 str = strerror_r(errnum, buf, buflen);
78 if (str != buf) {
79 if (strlcpy(buf, str, buflen) >= buflen) {
80 errno = ERANGE;
81 return -1;
82 }
83 }
84 return 0;
85 }
86
87 #else
88
89 /* Define a stub in terms of the real strerror_r, just to simplify the library
90 * export list. This shouldn't get used. */
91 int
k5_strerror_r(int errnum,char * buf,size_t buflen)92 k5_strerror_r(int errnum, char *buf, size_t buflen)
93 {
94 return strerror_r(errnum, buf, buflen);
95 }
96
97 #endif
98