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f5436bfc MJ |
1 | /* |
2 | * Copyright (C) 2015 Michael Jeanson <mjeanson@efficios.com> | |
afc5df03 | 3 | * 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
f5436bfc MJ |
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 | |
30 | static inline | |
31 | size_t lttng_strnlen(const char *str, size_t max) | |
32 | { | |
33 | return strnlen(str, max); | |
34 | } | |
35 | #else | |
36 | static inline | |
37 | size_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 | |
55 | static inline | |
56 | char *lttng_strndup(const char *s, size_t n) | |
57 | { | |
58 | return strndup(s, n); | |
59 | } | |
60 | #else | |
61 | static inline | |
62 | char *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'; | |
85 | end: | |
86 | return ret; | |
87 | } | |
88 | #endif /* HAVE_STRNDUP */ | |
89 | ||
afc5df03 JG |
90 | #ifdef HAVE_FLS |
91 | static inline int lttng_fls(int val) | |
92 | { | |
93 | return fls(val); | |
94 | } | |
95 | #else | |
96 | static 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)) { | |
afc5df03 JG |
120 | r -= 1; |
121 | } | |
122 | return r; | |
123 | } | |
124 | #endif /* HAVE_FLS */ | |
125 | ||
4b223a67 FD |
126 | #if HAVE_MEMRCHR |
127 | static inline | |
128 | void *lttng_memrchr(const void *s, int c, size_t n) | |
129 | { | |
130 | return memrchr(s, c, n); | |
131 | } | |
132 | #else | |
133 | static inline | |
134 | void *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 */ |