sys_time.h

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/*
 * Copyright 2016 Vincent Sanders <vince@netsurf-browser.org>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
/**
 * \file
 * BSD style timeval macros
 *
 * BSD added macros for manipulating timeval which have become standard on
 *  modern c libraries but for compatability where they are missing it is
 *  necessary to provide fallbacks.
 */
 
#ifndef NETSURF_UTILS_SYS_TIME_H_
#define NETSURF_UTILS_SYS_TIME_H_
 
#include <sys/time.h>
 
#ifndef timerclear
#define timerclear(a) ((a)->tv_sec = (a)->tv_usec = 0)
#endif
 
#ifndef timerisset
#define timerisset(a) ((a)->tv_sec || (a)->tv_usec)
#endif
 
#ifndef timeradd
#define timeradd(a, aa, result)                                         \
        do {                                                            \
                (result)->tv_sec = (a)->tv_sec + (aa)->tv_sec;          \
                (result)->tv_usec = (a)->tv_usec + (aa)->tv_usec;       \
                if ((result)->tv_usec >= 1000000) {                     \
                        ++(result)->tv_sec;                             \
                        (result)->tv_usec -= 1000000;                   \
                }                                                       \
        } while (0)
#endif
 
#ifndef timersub
#define timersub(a, aa, result)                                         \
        do {                                                            \
                (result)->tv_sec = (a)->tv_sec - (aa)->tv_sec;          \
                (result)->tv_usec = (a)->tv_usec - (aa)->tv_usec;       \
                if ((result)->tv_usec < 0) {                            \
                        --(result)->tv_sec;                             \
                        (result)->tv_usec += 1000000;                   \
                }                                                       \
        } while (0)
#endif
 
#ifndef timercmp
#define timercmp(a, aa, cmp)                                            \
        (((a)->tv_sec cmp (aa)->tv_sec) ||                              \
         ((a)->tv_sec == (aa)->tv_sec && (a)->tv_usec cmp (aa)->tv_usec))
#endif
 
#endif