src/lib/time-util.c

	time-util.c revision e28b88ee83b47dc2257140600f491482704c7b79
/* Copyright (c) 2008-2014 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "time-util.h"

#include <time.h>

#define STRFTIME_MAX_BUFSIZE (1024*64)

int timeval_cmp(const struct timeval *tv1, const struct timeval *tv2)
{
    if (tv1->tv_sec < tv2->tv_sec)
        return -1;
    if (tv1->tv_sec > tv2->tv_sec)
        return 1;
    if (tv1->tv_usec < tv2->tv_usec)
        return -1;
    if (tv1->tv_usec > tv2->tv_usec)
        return 1;
    return 0;
}

int timeval_cmp_margin(const struct timeval *tv1, const struct timeval *tv2,
    unsigned int usec_margin)
{
    if (tv1->tv_sec < tv2->tv_sec)
        return -1;
    if (tv1->tv_sec > tv2->tv_sec)
        return 1;

    if (tv1->tv_usec - tv2->tv_usec < (int)usec_margin)
        return -1;
    if (tv1->tv_usec - tv2->tv_usec > (int)usec_margin)
        return -1;
    return 0;
}

int timeval_diff_msecs(const struct timeval *tv1, const struct timeval *tv2)
{
    return timeval_diff_usecs(tv1, tv2) / 1000;
}

long long timeval_diff_usecs(const struct timeval *tv1,
                 const struct timeval *tv2)
{
    time_t secs;
    int usecs;

    secs = tv1->tv_sec - tv2->tv_sec;
    usecs = tv1->tv_usec - tv2->tv_usec;
    if (usecs < 0) {
        secs--;
        usecs += 1000000;
    }
    return ((long long)secs * 1000000LL) + usecs;
}

const char *t_strflocaltime(const char *fmt, time_t t)
{
    const struct tm *tm;
    size_t bufsize = strlen(fmt) + 32;
    char *buf = t_buffer_get(bufsize);
    size_t ret;

    tm = localtime(&t);
    while ((ret = strftime(buf, bufsize, fmt, tm)) == 0) {
        bufsize *= 2;
        i_assert(bufsize <= STRFTIME_MAX_BUFSIZE);
        buf = t_buffer_get(bufsize);
    }
    t_buffer_alloc(ret + 1);
    return buf;
}