Port: Add compat for strnlen and strndup
[babeltrace.git] / include / babeltrace / compat / string.h
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1#ifndef _BABELTRACE_COMPAT_STRING_H
2#define _BABELTRACE_COMPAT_STRING_H
3
4/*
5 * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26#include <string.h>
5ea98697 27#include <stdlib.h>
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28
29#if !defined(__linux__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
30
31/* XSI-compliant strerror_r */
32static inline
33int compat_strerror_r(int errnum, char *buf, size_t buflen)
34{
35 return strerror_r(errnum, buf, buflen);
36}
37
38#else
39
40/* GNU-compliant strerror_r */
41static inline
42int compat_strerror_r(int errnum, char *buf, size_t buflen)
43{
44 char *retbuf;
45
46 retbuf = strerror_r(errnum, buf, buflen);
47 if (retbuf != buf)
48 strncpy(buf, retbuf, buflen);
49 buf[buflen - 1] = '\0';
50 return 0;
51}
52
53#endif
54
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55#ifdef HAVE_STRNLEN
56static inline
57size_t bt_strnlen(const char *str, size_t max)
58{
59 return strnlen(str, max);
60}
61#else
62static inline
63size_t bt_strnlen(const char *str, size_t max)
64{
65 size_t ret;
66 const char *end;
67
68 end = memchr(str, 0, max);
69
70 if (end) {
71 ret = (size_t) (end - str);
72 } else {
73 ret = max;
74 }
75
76 return ret;
77}
78#endif /* HAVE_STRNLEN */
79
80#ifdef HAVE_STRNDUP
81static inline
82char *bt_strndup(const char *s, size_t n)
83{
84 return strndup(s, n);
85}
86#else
87static inline
88char *bt_strndup(const char *s, size_t n)
89{
90 char *ret;
91 size_t navail;
92
93 if (!s) {
94 ret = NULL;
95 goto end;
96 }
97
98 /* min() */
99 navail = strlen(s) + 1;
100 if ((n + 1) < navail) {
101 navail = n + 1;
102 }
103
104 ret = malloc(navail);
105 if (!ret) {
106 goto end;
107 }
108
109 memcpy(ret, s, navail);
110 ret[navail - 1] = '\0';
111end:
112 return ret;
113}
114#endif /* HAVE_STRNDUP */
115
9a7f65a3 116#endif /* _BABELTRACE_COMPAT_STRING_H */
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