projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| 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)) { | |
| 120 | x <<= 1; | |
| 121 | r -= 1; | |
| 122 | } | |
| 123 | return r; | |
| 124 | } | |
| 125 | #endif /* HAVE_FLS */ | |
| 126 | ||
| f5436bfc | 127 | #endif /* _COMPAT_STRING_H */ |