projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |