/* * Ouroboros - Copyright (C) 2016 - 2018 * * Time utilities * * Dimitri Staessens <dimitri.staessens@ugent.be> * Sander Vrijders <sander.vrijders@ugent.be> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * version 2.1 as published by the Free Software Foundation. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., http://www.fsf.org/about/contact/. */ #define _POSIX_C_SOURCE 199309L #include <ouroboros/time_utils.h> #include <stddef.h> /* functions for timespecs */ /* add intv to t and store it in res*/ int ts_add(const struct timespec * t, const struct timespec * intv, struct timespec * res) { time_t nanos = 0; if (t == NULL || intv == NULL || res == NULL) return -1; nanos = t->tv_nsec + intv->tv_nsec; res->tv_sec = t->tv_sec + intv->tv_sec; while (nanos >= BILLION) { nanos -= BILLION; ++(res->tv_sec); } res->tv_nsec = nanos; return 0; } /* subtract intv from t and stores it in res */ int ts_diff(const struct timespec * t, const struct timespec * intv, struct timespec * res) { time_t nanos = 0; if (t == NULL || intv == NULL || res == NULL) return -1; nanos = t->tv_nsec - intv->tv_nsec; res->tv_sec = t->tv_sec - intv->tv_sec; while (nanos < 0) { nanos += BILLION; --(res->tv_sec); } res->tv_nsec = nanos; return 0; } /* functions for timevals */ /* add intv to t and store it in res*/ int tv_add(const struct timeval * t, const struct timeval * intv, struct timeval * res) { time_t micros = 0; if (t == NULL || intv == NULL || res == NULL) return -1; micros = t->tv_usec + intv->tv_usec; res->tv_sec = t->tv_sec + intv->tv_sec; while (micros >= MILLION) { micros -= MILLION; ++(res->tv_sec); } res->tv_usec = micros; return 0; } /* subtract intv from t and stores it in res */ int tv_diff(const struct timeval * t, const struct timeval * intv, struct timeval * res) { time_t micros = 0; if (t == NULL || intv == NULL || res == NULL) return -1; micros = t->tv_usec - intv->tv_usec; res->tv_sec = t->tv_sec - intv->tv_sec; while (micros < 0) { micros += MILLION; --(res->tv_sec); } res->tv_usec = micros; return 0; } int tv_to_ts(const struct timeval * src, struct timespec * dst) { if (src == NULL || dst == NULL) return -1; dst->tv_sec = src->tv_sec; dst->tv_nsec = src->tv_usec * 1000L; return 0; } /* copying a timespec into a timeval (loss of resolution) */ int ts_to_tv(const struct timespec * src, struct timeval * dst) { if (src == NULL || dst == NULL) return -1; dst->tv_sec = src->tv_sec; dst->tv_usec = src->tv_nsec / 1000L; return 0; }