287 lines
8.2 KiB
C
287 lines
8.2 KiB
C
/*
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* Copyright (c) 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Timeval stuff
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*/
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#include <config.h>
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#include "roken.h"
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ROKEN_LIB_FUNCTION time_t ROKEN_LIB_CALL
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rk_time_add(time_t t, time_t delta)
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{
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if (delta == 0)
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return t;
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#ifdef TIME_T_SIGNED
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/* Signed overflow is UB in C */
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#if SIZEOF_TIME_T == 4
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if (t >= 0 && delta > 0 && INT32_MAX - t < delta)
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/* Time left to hit INT32_MAX is less than what we want to add */
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return INT32_MAX;
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else if (t == INT32_MIN && delta < 0)
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/* Avoid computing -t when t == INT32_MIN! */
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return INT32_MIN;
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else if (t < 0 && delta < 0 && INT32_MIN + (-t) > delta)
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/* Time left to hit INT32_MIN is less than what we want to subtract */
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return INT32_MIN;
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else
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return t + delta;
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#elif SIZEOF_TIME_T == 8
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if (t >= 0 && delta > 0 && INT64_MAX - t < delta)
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return INT64_MAX;
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else if (t == INT64_MIN && delta < 0)
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/* Avoid computing -t when t == INT64_MIN! */
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return INT64_MIN;
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else if (t < 0 && delta < 0 && INT64_MIN + (-t) > delta)
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return INT64_MIN;
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else
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return t + delta;
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#else
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#error "Unexpected sizeof(time_t)"
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#endif
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#else
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/* Unsigned overflow is defined in C */
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#if SIZEOF_TIME_T == 4
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if (t + delta < t)
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return UINT32_MAX;
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#elif SIZEOF_TIME_T == 8
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if (t + delta < t)
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return UINT64_MAX;
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#else
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#error "Unexpected sizeof(time_t)"
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#endif
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return t + delta;
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#endif
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}
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ROKEN_LIB_FUNCTION time_t ROKEN_LIB_CALL
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rk_time_sub(time_t t, time_t delta)
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{
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if (delta == 0)
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return t;
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#ifdef TIME_T_SIGNED
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if (delta > 0)
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return rk_time_add(t, -delta);
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#if SIZEOF_TIME_T == 4
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if (delta == INT32_MIN) {
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if (t < 0) {
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t = t + INT32_MAX;
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return t + 1;
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}
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return INT32_MAX;
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}
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/* Safe to compute -delta, so use rk_time_add() to add -delta */
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return rk_time_add(t, -delta);
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#elif SIZEOF_TIME_T == 8
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if (delta == INT64_MIN) {
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if (t < 0) {
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t = t + INT64_MAX;
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return t + 1;
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}
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return INT64_MAX;
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}
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return rk_time_add(t, -delta);
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#else
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#error "Unexpected sizeof(time_t)"
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#endif
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#else
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/* Both t and delta are non-negative. */
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if (delta > t)
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return 0;
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return t - delta;
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#endif
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}
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/*
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* Make `t1' consistent.
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*/
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ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
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timevalfix(struct timeval *t1)
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{
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if (t1->tv_usec < 0) {
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t1->tv_sec = rk_time_sub(t1->tv_sec, 1);
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t1->tv_usec = 1000000;
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}
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if (t1->tv_usec >= 1000000) {
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t1->tv_sec = rk_time_add(t1->tv_sec, 1);
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t1->tv_usec -= 1000000;
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}
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}
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/*
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* t1 += t2
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*/
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ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
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timevaladd(struct timeval *t1, const struct timeval *t2)
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{
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t1->tv_sec = rk_time_add(t1->tv_sec, t2->tv_sec);
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t1->tv_usec += t2->tv_usec;
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timevalfix(t1);
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}
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/*
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* t1 -= t2
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*/
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ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
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timevalsub(struct timeval *t1, const struct timeval *t2)
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{
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t1->tv_sec = rk_time_sub(t1->tv_sec, t2->tv_sec);
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t1->tv_usec -= t2->tv_usec;
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timevalfix(t1);
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}
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#ifdef TEST
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int
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main(int argc, char **argv)
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{
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time_t t, delta, r;
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int e = 0;
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if (argc == 0)
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return 0; /* Apparently POSIX and Linux allow this case */
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argc--;
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argv++;
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while (argc > 0) {
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int64_t n;
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time_t a;
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char *ends;
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if (argc < 3)
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errx(1, "Usage: [TIME +|- DELTA [== TIME]]");
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errno = 0;
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n = strtoll(argv[0], &ends, 0);
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if (errno)
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err(1, "Time value is invalid");
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if (*ends != '\0')
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errx(1, "Time value is invalid");
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t = n;
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n = strtoll(argv[2], &ends, 0);
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if (errno)
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err(1, "Delta value is invalid");
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if (*ends != '\0')
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errx(1, "Delta value is invalid");
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delta = n;
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if (argv[1][0] == '+' && argv[1][1] == '\0')
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r = rk_time_add(t, delta);
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else if (argv[1][0] == '-' && argv[1][1] == '\0')
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r = rk_time_sub(t, delta);
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else
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errx(1, "Operator must be a + or a - arithmetic operator");
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if (delta == 0 && r != t) {
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warnx("%s %s %s != %s!", argv[0], argv[1], argv[2], argv[0]);
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e = 1;
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}
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if (t == 0 && r != delta) {
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warnx("%s %s %s != %s!", argv[0], argv[1], argv[2], argv[2]);
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e = 1;
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}
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if (argc > 4 && strcmp(argv[3], "==") == 0) {
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n = strtoll(argv[4], &ends, 0);
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if (errno)
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err(1, "Time value is invalid");
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if (*ends != '\0')
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errx(1, "Time value is invalid");
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a = n;
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if (a != r) {
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warnx("%s %s %s != %s!", argv[0], argv[1], argv[2], argv[4]);
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e = 1;
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}
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argc -= 5;
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argv += 5;
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} else {
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#ifdef TIME_T_SIGNED
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printf("%s %s %s == %lld\n", argv[0], argv[1], argv[2],
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(long long)r);
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#else
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printf("%s %s %s == %llu\n", argv[0], argv[1], argv[2],
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(unsigned long long)r);
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#endif
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argc -= 3;
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argv += 3;
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}
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}
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#define CHECK(e) do { if (!(e)) errx(1, "Expression not true: " #e "!"); } while (0)
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#ifdef TIME_T_SIGNED
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#if SIZEOF_TIME_T == 4
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CHECK(rk_time_add(INT32_MIN, -1) == INT32_MIN);
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CHECK(rk_time_sub(INT32_MIN, 1) == INT32_MIN);
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CHECK(rk_time_sub(-1, INT32_MAX) == INT32_MIN);
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CHECK(rk_time_add(INT32_MAX, 0) == INT32_MAX);
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CHECK(rk_time_add(INT32_MAX, 1) == INT32_MAX);
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CHECK(rk_time_add(1, INT32_MAX) == INT32_MAX);
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CHECK(rk_time_add(0, INT32_MAX) == INT32_MAX);
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#elif SIZEOF_TIME_T == 8
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CHECK(rk_time_add(INT64_MIN, -1) == INT64_MIN);
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CHECK(rk_time_sub(INT64_MIN, 1) == INT64_MIN);
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CHECK(rk_time_sub(-1, INT64_MAX) == INT64_MIN);
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CHECK(rk_time_add(INT64_MAX, 0) == INT64_MAX);
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CHECK(rk_time_add(INT64_MAX, 1) == INT64_MAX);
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CHECK(rk_time_add(1, INT64_MAX) == INT64_MAX);
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CHECK(rk_time_add(0, INT64_MAX) == INT64_MAX);
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#endif
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CHECK(rk_time_add(0, -1) == -1);
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CHECK(rk_time_sub(0, 1) == -1);
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#else
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#if SIZEOF_TIME_T == 4
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CHECK(rk_time_add(UINT32_MAX, 0) == UINT32_MAX);
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CHECK(rk_time_add(UINT32_MAX, 1) == UINT32_MAX);
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CHECK(rk_time_add(1, UINT32_MAX) == UINT32_MAX);
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CHECK(rk_time_add(0, UINT32_MAX) == UINT32_MAX);
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#elif SIZEOF_TIME_T == 8
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CHECK(rk_time_add(UINT64_MAX, 0) == UINT64_MAX);
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CHECK(rk_time_add(UINT64_MAX, 1) == UINT64_MAX);
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CHECK(rk_time_add(1, UINT64_MAX) == UINT64_MAX);
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CHECK(rk_time_add(0, UINT64_MAX) == UINT64_MAX);
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#endif
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#endif
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CHECK(rk_time_add(0, 1) == 1);
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CHECK(rk_time_add(1, 0) == 1);
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return e;
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}
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#endif
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