| 1 | /* |
| 2 | * Copyright (C) 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License, version 2 only, as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #include <common/time.h> |
| 19 | #include <common/error.h> |
| 20 | #include <common/macros.h> |
| 21 | #include <common/error.h> |
| 22 | #include <stddef.h> |
| 23 | #include <stdint.h> |
| 24 | #include <limits.h> |
| 25 | #include <errno.h> |
| 26 | #include <pthread.h> |
| 27 | #include <locale.h> |
| 28 | #include <string.h> |
| 29 | |
| 30 | static bool utf8_output_supported; |
| 31 | |
| 32 | LTTNG_HIDDEN |
| 33 | bool locale_supports_utf8(void) |
| 34 | { |
| 35 | return utf8_output_supported; |
| 36 | } |
| 37 | |
| 38 | LTTNG_HIDDEN |
| 39 | int timespec_to_ms(struct timespec ts, unsigned long *ms) |
| 40 | { |
| 41 | unsigned long res, remain_ms; |
| 42 | |
| 43 | if (ts.tv_sec > ULONG_MAX / MSEC_PER_SEC) { |
| 44 | errno = EOVERFLOW; |
| 45 | return -1; /* multiplication overflow */ |
| 46 | } |
| 47 | res = ts.tv_sec * MSEC_PER_SEC; |
| 48 | remain_ms = ULONG_MAX - res; |
| 49 | if (ts.tv_nsec / NSEC_PER_MSEC > remain_ms) { |
| 50 | errno = EOVERFLOW; |
| 51 | return -1; /* addition overflow */ |
| 52 | } |
| 53 | res += ts.tv_nsec / NSEC_PER_MSEC; |
| 54 | *ms = res; |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | LTTNG_HIDDEN |
| 59 | struct timespec timespec_abs_diff(struct timespec t1, struct timespec t2) |
| 60 | { |
| 61 | uint64_t ts1 = (uint64_t) t1.tv_sec * (uint64_t) NSEC_PER_SEC + |
| 62 | (uint64_t) t1.tv_nsec; |
| 63 | uint64_t ts2 = (uint64_t) t2.tv_sec * (uint64_t) NSEC_PER_SEC + |
| 64 | (uint64_t) t2.tv_nsec; |
| 65 | uint64_t diff = max(ts1, ts2) - min(ts1, ts2); |
| 66 | struct timespec res; |
| 67 | |
| 68 | res.tv_sec = diff / (uint64_t) NSEC_PER_SEC; |
| 69 | res.tv_nsec = diff % (uint64_t) NSEC_PER_SEC; |
| 70 | return res; |
| 71 | } |
| 72 | |
| 73 | static |
| 74 | void __attribute__((constructor)) init_locale_utf8_support(void) |
| 75 | { |
| 76 | const char *program_locale = setlocale(LC_ALL, NULL); |
| 77 | const char *lang = getenv("LANG"); |
| 78 | |
| 79 | if (program_locale && strstr(program_locale, "utf8")) { |
| 80 | utf8_output_supported = true; |
| 81 | } else if (lang && strstr(lang, "utf8")) { |
| 82 | utf8_output_supported = true; |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | LTTNG_HIDDEN |
| 87 | int time_to_iso8601_str(time_t time, char *str, size_t len) |
| 88 | { |
| 89 | int ret = 0; |
| 90 | struct tm *tm_result; |
| 91 | struct tm tm_storage; |
| 92 | size_t strf_ret; |
| 93 | |
| 94 | if (len < ISO8601_STR_LEN) { |
| 95 | ERR("Buffer too short to format ISO 8601 timestamp: %zu bytes provided when at least %zu are needed", |
| 96 | len, ISO8601_STR_LEN); |
| 97 | ret = -1; |
| 98 | goto end; |
| 99 | } |
| 100 | |
| 101 | tm_result = localtime_r(&time, &tm_storage); |
| 102 | if (!tm_result) { |
| 103 | ret = -1; |
| 104 | PERROR("Failed to break down timestamp to tm structure"); |
| 105 | goto end; |
| 106 | } |
| 107 | |
| 108 | strf_ret = strftime(str, len, "%Y%m%dT%H%M%S%z", tm_result); |
| 109 | if (strf_ret == 0) { |
| 110 | ret = -1; |
| 111 | ERR("Failed to format timestamp as local time"); |
| 112 | goto end; |
| 113 | } |
| 114 | end: |
| 115 | return ret; |
| 116 | } |