view src/core/ngx_parse_time.c @ 7397:860d3907da1c

Upstream: revised upstream response time variables. Variables now do not depend on presence of the HTTP status code in response. If the corresponding event occurred, variables contain time between request creation and the event, and "-" otherwise. Previously, intermediate value of the $upstream_response_time variable held unix timestamp.
author Vladimir Homutov <vl@nginx.com>
date Wed, 21 Nov 2018 13:40:40 +0300
parents b38a8f0ca4a2
children
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>


static ngx_uint_t  mday[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

time_t
ngx_parse_http_time(u_char *value, size_t len)
{
    u_char      *p, *end;
    ngx_int_t    month;
    ngx_uint_t   day, year, hour, min, sec;
    uint64_t     time;
    enum {
        no = 0,
        rfc822,   /* Tue, 10 Nov 2002 23:50:13   */
        rfc850,   /* Tuesday, 10-Dec-02 23:50:13 */
        isoc      /* Tue Dec 10 23:50:13 2002    */
    } fmt;

    fmt = 0;
    end = value + len;

#if (NGX_SUPPRESS_WARN)
    day = 32;
    year = 2038;
#endif

    for (p = value; p < end; p++) {
        if (*p == ',') {
            break;
        }

        if (*p == ' ') {
            fmt = isoc;
            break;
        }
    }

    for (p++; p < end; p++) {
        if (*p != ' ') {
            break;
        }
    }

    if (end - p < 18) {
        return NGX_ERROR;
    }

    if (fmt != isoc) {
        if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
            return NGX_ERROR;
        }

        day = (*p - '0') * 10 + (*(p + 1) - '0');
        p += 2;

        if (*p == ' ') {
            if (end - p < 18) {
                return NGX_ERROR;
            }
            fmt = rfc822;

        } else if (*p == '-') {
            fmt = rfc850;

        } else {
            return NGX_ERROR;
        }

        p++;
    }

    switch (*p) {

    case 'J':
        month = *(p + 1) == 'a' ? 0 : *(p + 2) == 'n' ? 5 : 6;
        break;

    case 'F':
        month = 1;
        break;

    case 'M':
        month = *(p + 2) == 'r' ? 2 : 4;
        break;

    case 'A':
        month = *(p + 1) == 'p' ? 3 : 7;
        break;

    case 'S':
        month = 8;
        break;

    case 'O':
        month = 9;
        break;

    case 'N':
        month = 10;
        break;

    case 'D':
        month = 11;
        break;

    default:
        return NGX_ERROR;
    }

    p += 3;

    if ((fmt == rfc822 && *p != ' ') || (fmt == rfc850 && *p != '-')) {
        return NGX_ERROR;
    }

    p++;

    if (fmt == rfc822) {
        if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9'
            || *(p + 2) < '0' || *(p + 2) > '9'
            || *(p + 3) < '0' || *(p + 3) > '9')
        {
            return NGX_ERROR;
        }

        year = (*p - '0') * 1000 + (*(p + 1) - '0') * 100
               + (*(p + 2) - '0') * 10 + (*(p + 3) - '0');
        p += 4;

    } else if (fmt == rfc850) {
        if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
            return NGX_ERROR;
        }

        year = (*p - '0') * 10 + (*(p + 1) - '0');
        year += (year < 70) ? 2000 : 1900;
        p += 2;
    }

    if (fmt == isoc) {
        if (*p == ' ') {
            p++;
        }

        if (*p < '0' || *p > '9') {
            return NGX_ERROR;
        }

        day = *p++ - '0';

        if (*p != ' ') {
            if (*p < '0' || *p > '9') {
                return NGX_ERROR;
            }

            day = day * 10 + (*p++ - '0');
        }

        if (end - p < 14) {
            return NGX_ERROR;
        }
    }

    if (*p++ != ' ') {
        return NGX_ERROR;
    }

    if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
        return NGX_ERROR;
    }

    hour = (*p - '0') * 10 + (*(p + 1) - '0');
    p += 2;

    if (*p++ != ':') {
        return NGX_ERROR;
    }

    if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
        return NGX_ERROR;
    }

    min = (*p - '0') * 10 + (*(p + 1) - '0');
    p += 2;

    if (*p++ != ':') {
        return NGX_ERROR;
    }

    if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
        return NGX_ERROR;
    }

    sec = (*p - '0') * 10 + (*(p + 1) - '0');

    if (fmt == isoc) {
        p += 2;

        if (*p++ != ' ') {
            return NGX_ERROR;
        }

        if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9'
            || *(p + 2) < '0' || *(p + 2) > '9'
            || *(p + 3) < '0' || *(p + 3) > '9')
        {
            return NGX_ERROR;
        }

        year = (*p - '0') * 1000 + (*(p + 1) - '0') * 100
               + (*(p + 2) - '0') * 10 + (*(p + 3) - '0');
    }

    if (hour > 23 || min > 59 || sec > 59) {
        return NGX_ERROR;
    }

    if (day == 29 && month == 1) {
        if ((year & 3) || ((year % 100 == 0) && (year % 400) != 0)) {
            return NGX_ERROR;
        }

    } else if (day > mday[month]) {
        return NGX_ERROR;
    }

    /*
     * shift new year to March 1 and start months from 1 (not 0),
     * it is needed for Gauss' formula
     */

    if (--month <= 0) {
        month += 12;
        year -= 1;
    }

    /* Gauss' formula for Gregorian days since March 1, 1 BC */

    time = (uint64_t) (
            /* days in years including leap years since March 1, 1 BC */

            365 * year + year / 4 - year / 100 + year / 400

            /* days before the month */

            + 367 * month / 12 - 30

            /* days before the day */

            + day - 1

            /*
             * 719527 days were between March 1, 1 BC and March 1, 1970,
             * 31 and 28 days were in January and February 1970
             */

            - 719527 + 31 + 28) * 86400 + hour * 3600 + min * 60 + sec;

#if (NGX_TIME_T_SIZE <= 4)

    if (time > 0x7fffffff) {
        return NGX_ERROR;
    }

#endif

    return (time_t) time;
}