Kernel-ctl: Expose kernel clear buffer operation
[lttng-tools.git] / src / common / compat / string.h
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1/*
2 * Copyright (C) 2015 Michael Jeanson <mjeanson@efficios.com>
afc5df03 3 * 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
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4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24#ifndef _COMPAT_STRING_H
25#define _COMPAT_STRING_H
26
27#include <string.h>
28
29#ifdef HAVE_STRNLEN
30static inline
31size_t lttng_strnlen(const char *str, size_t max)
32{
33 return strnlen(str, max);
34}
35#else
36static inline
37size_t lttng_strnlen(const char *str, size_t max)
38{
39 size_t ret;
40 const char *end;
41
42 end = memchr(str, 0, max);
43
44 if (end) {
45 ret = (size_t) (end - str);
46 } else {
47 ret = max;
48 }
49
50 return ret;
51}
52#endif /* HAVE_STRNLEN */
53
54#ifdef HAVE_STRNDUP
55static inline
56char *lttng_strndup(const char *s, size_t n)
57{
58 return strndup(s, n);
59}
60#else
61static inline
62char *lttng_strndup(const char *s, size_t n)
63{
64 char *ret;
65 size_t navail;
66
67 if (!s) {
68 ret = NULL;
69 goto end;
70 }
71
72 /* min() */
73 navail = strlen(s) + 1;
74 if ((n + 1) < navail) {
75 navail = n + 1;
76 }
77
78 ret = malloc(navail);
79 if (!ret) {
80 goto end;
81 }
82
83 memcpy(ret, s, navail);
84 ret[navail - 1] = '\0';
85end:
86 return ret;
87}
88#endif /* HAVE_STRNDUP */
89
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90#ifdef HAVE_FLS
91static inline int lttng_fls(int val)
92{
93 return fls(val);
94}
95#else
96static inline int lttng_fls(int val)
97{
98 int r = 32;
99 unsigned int x = (unsigned int) val;
100
101 if (!x)
102 return 0;
103 if (!(x & 0xFFFF0000U)) {
104 x <<= 16;
105 r -= 16;
106 }
107 if (!(x & 0xFF000000U)) {
108 x <<= 8;
109 r -= 8;
110 }
111 if (!(x & 0xF0000000U)) {
112 x <<= 4;
113 r -= 4;
114 }
115 if (!(x & 0xC0000000U)) {
116 x <<= 2;
117 r -= 2;
118 }
119 if (!(x & 0x80000000U)) {
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120 r -= 1;
121 }
122 return r;
123}
124#endif /* HAVE_FLS */
125
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126#if HAVE_MEMRCHR
127static inline
128void *lttng_memrchr(const void *s, int c, size_t n)
129{
130 return memrchr(s, c, n);
131}
132#else
133static inline
134void *lttng_memrchr(const void *s, int c, size_t n)
135{
136 int i;
137 const char *str = s;
138 for (i = n-1; i >= 0; i--) {
139 if (str[i] == (char)c) {
140 return (void *)(str+i);
141 }
142 }
143 return NULL;
144}
145#endif /* HAVE_MEMRCHR */
146
f5436bfc 147#endif /* _COMPAT_STRING_H */
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