lib/iso3307.c

   1 /*
   2  * Copyright (C) 1996-2021 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 "util.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 #if HAVE_TIME_H
  19 #include <time.h>
  20 #endif
  21
  22 #define ASCII_DIGIT(c) ((c)-48)
  23
  24 time_t
  25 parse_iso3307_time(const char *buf)
  26 {
  27     /* buf is an ISO 3307 style time: YYYYMMDDHHMMSS or YYYYMMDDHHMMSS.xxx */
  28     struct tm tms;
  29     time_t t;
  30     while (*buf == ' ' || *buf == '\t')
  31         buf++;
  32     if ((int) strlen(buf) < 14)
  33         return 0;
  34     memset(&tms, '\0', sizeof(struct tm));
  35     tms.tm_year = (ASCII_DIGIT(buf[0]) * 1000) + (ASCII_DIGIT(buf[1]) * 100) +
  36                   (ASCII_DIGIT(buf[2]) * 10) + ASCII_DIGIT(buf[3]) - 1900;
  37     tms.tm_mon = (ASCII_DIGIT(buf[4]) * 10) + ASCII_DIGIT(buf[5]) - 1;
  38     tms.tm_mday = (ASCII_DIGIT(buf[6]) * 10) + ASCII_DIGIT(buf[7]);
  39     tms.tm_hour = (ASCII_DIGIT(buf[8]) * 10) + ASCII_DIGIT(buf[9]);
  40     tms.tm_min = (ASCII_DIGIT(buf[10]) * 10) + ASCII_DIGIT(buf[11]);
  41     tms.tm_sec = (ASCII_DIGIT(buf[12]) * 10) + ASCII_DIGIT(buf[13]);
  42 #if HAVE_TIMEGM
  43     t = timegm(&tms);
  44 #elif HAVE_MKTIME
  45     t = mktime(&tms);
  46 #else
  47     t = (time_t) 0;
  48 #endif
  49     return t;
  50 }
  51