Commit | Line | Data |
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f5436bfc MJ |
1 | /* |
2 | * Copyright (C) 2015 Michael Jeanson <mjeanson@efficios.com> | |
ab5be9fa | 3 | * Copyright (C) 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
f5436bfc | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: MIT |
f5436bfc | 6 | * |
f5436bfc MJ |
7 | */ |
8 | ||
9 | #ifndef _COMPAT_STRING_H | |
10 | #define _COMPAT_STRING_H | |
11 | ||
12 | #include <string.h> | |
13 | ||
14 | #ifdef HAVE_STRNLEN | |
15 | static inline | |
16 | size_t lttng_strnlen(const char *str, size_t max) | |
17 | { | |
18 | return strnlen(str, max); | |
19 | } | |
20 | #else | |
21 | static inline | |
22 | size_t lttng_strnlen(const char *str, size_t max) | |
23 | { | |
24 | size_t ret; | |
25 | const char *end; | |
26 | ||
27 | end = memchr(str, 0, max); | |
28 | ||
29 | if (end) { | |
30 | ret = (size_t) (end - str); | |
31 | } else { | |
32 | ret = max; | |
33 | } | |
34 | ||
35 | return ret; | |
36 | } | |
37 | #endif /* HAVE_STRNLEN */ | |
38 | ||
39 | #ifdef HAVE_STRNDUP | |
40 | static inline | |
41 | char *lttng_strndup(const char *s, size_t n) | |
42 | { | |
43 | return strndup(s, n); | |
44 | } | |
45 | #else | |
46 | static inline | |
47 | char *lttng_strndup(const char *s, size_t n) | |
48 | { | |
49 | char *ret; | |
50 | size_t navail; | |
51 | ||
52 | if (!s) { | |
53 | ret = NULL; | |
54 | goto end; | |
55 | } | |
56 | ||
57 | /* min() */ | |
58 | navail = strlen(s) + 1; | |
59 | if ((n + 1) < navail) { | |
60 | navail = n + 1; | |
61 | } | |
62 | ||
63 | ret = malloc(navail); | |
64 | if (!ret) { | |
65 | goto end; | |
66 | } | |
67 | ||
68 | memcpy(ret, s, navail); | |
69 | ret[navail - 1] = '\0'; | |
70 | end: | |
71 | return ret; | |
72 | } | |
73 | #endif /* HAVE_STRNDUP */ | |
74 | ||
afc5df03 JG |
75 | #ifdef HAVE_FLS |
76 | static inline int lttng_fls(int val) | |
77 | { | |
78 | return fls(val); | |
79 | } | |
80 | #else | |
81 | static inline int lttng_fls(int val) | |
82 | { | |
83 | int r = 32; | |
84 | unsigned int x = (unsigned int) val; | |
85 | ||
86 | if (!x) | |
87 | return 0; | |
88 | if (!(x & 0xFFFF0000U)) { | |
89 | x <<= 16; | |
90 | r -= 16; | |
91 | } | |
92 | if (!(x & 0xFF000000U)) { | |
93 | x <<= 8; | |
94 | r -= 8; | |
95 | } | |
96 | if (!(x & 0xF0000000U)) { | |
97 | x <<= 4; | |
98 | r -= 4; | |
99 | } | |
100 | if (!(x & 0xC0000000U)) { | |
101 | x <<= 2; | |
102 | r -= 2; | |
103 | } | |
104 | if (!(x & 0x80000000U)) { | |
afc5df03 JG |
105 | r -= 1; |
106 | } | |
107 | return r; | |
108 | } | |
109 | #endif /* HAVE_FLS */ | |
110 | ||
4b223a67 FD |
111 | #if HAVE_MEMRCHR |
112 | static inline | |
113 | void *lttng_memrchr(const void *s, int c, size_t n) | |
114 | { | |
115 | return memrchr(s, c, n); | |
116 | } | |
117 | #else | |
118 | static inline | |
119 | void *lttng_memrchr(const void *s, int c, size_t n) | |
120 | { | |
121 | int i; | |
122 | const char *str = s; | |
123 | for (i = n-1; i >= 0; i--) { | |
124 | if (str[i] == (char)c) { | |
125 | return (void *)(str+i); | |
126 | } | |
127 | } | |
128 | return NULL; | |
129 | } | |
130 | #endif /* HAVE_MEMRCHR */ | |
131 | ||
f5436bfc | 132 | #endif /* _COMPAT_STRING_H */ |