base/libs/qdecoder/qTime.c

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/*
 * Copyright 2008 The qDecoder Project. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE QDECODER PROJECT ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE QDECODER PROJECT BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <time.h>
#include "qDecoder.h"
#include "qInternal.h"

char *qTimeGetLocalStrf(char *buf, int size, time_t utctime, const char *format) {
    if(utctime == 0) utctime = time(NULL);
    struct tm *localtm = localtime(&utctime);

    if(strftime(buf, size, format, localtm) == 0) {
        snprintf(buf, size, "(buffer small)");
    }

    return buf;
}

char *qTimeGetLocalStr(time_t utctime) {
    int size = sizeof(char) * (CONST_STRLEN("00-Jan-0000 00:00:00 +0000") + 1);
    char *timestr = (char *)malloc(size);
    qTimeGetLocalStrf(timestr, size, utctime, "%d-%b-%Y %H:%M:%S %z");
    return timestr;
}

const char *qTimeGetLocalStaticStr(time_t utctime) {
    static char timestr[sizeof(char) * (CONST_STRLEN("00-Jan-0000 00:00:00 +0000") + 1)];
    qTimeGetLocalStrf(timestr, sizeof(timestr), utctime, "%d-%b-%Y %H:%M:%S %z");
    return timestr;
}

char *qTimeGetGmtStrf(char *buf, int size, time_t utctime, const char *format) {
    if(utctime == 0) utctime = time(NULL);
    struct tm *gmtm = gmtime(&utctime);

    strftime(buf, size, format, gmtm);
    return buf;
}

char *qTimeGetGmtStr(time_t utctime) {
    int size = sizeof(char) * (CONST_STRLEN("Mon, 00-Jan-0000 00:00:00 GMT") + 1);
    char *timestr = (char*)malloc(size);
    qTimeGetGmtStrf(timestr, size, utctime, "%a, %d %b %Y %H:%M:%S GMT");
    return timestr;
}

const char *qTimeGetGmtStaticStr(time_t utctime) {
    static char timestr[sizeof(char) * (CONST_STRLEN("Mon, 00-Jan-0000 00:00:00 GMT") + 1)];
    qTimeGetGmtStrf(timestr, sizeof(timestr), utctime, "%a, %d %b %Y %H:%M:%S GMT");
    return timestr;
}

time_t qTimeParseGmtStr(const char *gmtstr) {
    struct tm gmtm;
    if(strptime(gmtstr, "%a, %d %b %Y %H:%M:%S", &gmtm) == NULL) return 0;
    time_t utc = timegm(&gmtm);
    if(utc < 0) return -1;

    // parse timezone
    char *p;
    if((p = strstr(gmtstr, "+")) != NULL) {
        utc -= ((atoi(p + 1) / 100) * 60 * 60);
        if(utc < 0) return -1;
    } else if((p = strstr(gmtstr, "-")) != NULL) {
        utc += ((atoi(p + 1) / 100) * 60 * 60);
    }

    return utc;
}

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