src/time/iso3307.cc

   1 /*
   2  * Copyright (C) 1996-2022 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #include "squid.h"
  10 #include "time/gadgets.h"
  11
  12 #if HAVE_STRING_H
  13 #include <string.h>
  14 #endif
  15 #if HAVE_CTYPE_H
  16 #include <ctype.h>
  17 #endif
  18
  19 #define ASCII_DIGIT(c) ((c)-48)
  20
  21 time_t
  22 Time::ParseIso3307(const char *buf)
  23 {
  24     /* buf is an ISO 3307 style time: YYYYMMDDHHMMSS or YYYYMMDDHHMMSS.xxx */
  25     struct tm tms;
  26     time_t t;
  27     while (*buf == ' ' || *buf == '\t')
  28         buf++;
  29     if ((int) strlen(buf) < 14)
  30         return 0;
  31     memset(&tms, '\0', sizeof(struct tm));
  32     tms.tm_year = (ASCII_DIGIT(buf[0]) * 1000) + (ASCII_DIGIT(buf[1]) * 100) +
  33                   (ASCII_DIGIT(buf[2]) * 10) + ASCII_DIGIT(buf[3]) - 1900;
  34     tms.tm_mon = (ASCII_DIGIT(buf[4]) * 10) + ASCII_DIGIT(buf[5]) - 1;
  35     tms.tm_mday = (ASCII_DIGIT(buf[6]) * 10) + ASCII_DIGIT(buf[7]);
  36     tms.tm_hour = (ASCII_DIGIT(buf[8]) * 10) + ASCII_DIGIT(buf[9]);
  37     tms.tm_min = (ASCII_DIGIT(buf[10]) * 10) + ASCII_DIGIT(buf[11]);
  38     tms.tm_sec = (ASCII_DIGIT(buf[12]) * 10) + ASCII_DIGIT(buf[13]);
  39 #if HAVE_TIMEGM
  40     t = timegm(&tms);
  41 #elif HAVE_MKTIME
  42     t = mktime(&tms);
  43 #else
  44     t = (time_t) 0;
  45 #endif
  46     return t;
  47 }
  48