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    1: /*
    2:  * Copyright (c) Cameron Rich
    3:  * 
    4:  * All rights reserved.
    5:  * 
    6:  * Redistribution and use in source and binary forms, with or without 
    7:  * modification, are permitted provided that the following conditions are met:
    8:  *
    9:  * * Redistributions of source code must retain the above copyright notice, 
   10:  *   this list of conditions and the following disclaimer.
   11:  * * Redistributions in binary form must reproduce the above copyright notice, 
   12:  *   this list of conditions and the following disclaimer in the documentation 
   13:  *   and/or other materials provided with the distribution.
   14:  * * Neither the name of the axTLS project nor the names of its contributors 
   15:  *   may be used to endorse or promote products derived from this software 
   16:  *   without specific prior written permission.
   17:  *
   18:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   19:  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   20:  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   21:  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   22:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   23:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   24:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   25:  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   26:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   27:  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   28:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29:  */
   30: 
   31: #include <sys/types.h>
   32: #include <ctype.h>
   33: #include <stdio.h>
   34: #include <stdlib.h>
   35: #include <string.h>
   36: #include <time.h>
   37: #include "axhttp.h"
   38: 
   39: struct day_mon_map 
   40: {
   41:     const char* s;
   42:     uint8_t l;
   43: };
   44: 
   45: static struct day_mon_map wday_tab[] = 
   46: {
   47:     { "Sun", 0 }, { "Mon", 1 }, { "Tue", 2 }, { "Wed", 3 },
   48:     { "Thu", 4 }, { "Fri", 5 }, { "Sat", 6 }, 
   49: };
   50: 
   51: static struct day_mon_map mon_tab[] = 
   52: {
   53:     { "Jan", 0 }, { "Feb", 1 }, { "Mar", 2 }, { "Apr", 3 },
   54:     { "May", 4 }, { "Jun", 5 }, { "Jul", 6 }, { "Aug", 7 },
   55:     { "Sep", 8 }, { "Oct", 9 }, { "Nov", 10 }, { "Dec", 11 },
   56: };
   57: 
   58: static int day_mon_map_compare(const char *v1, const char *v2)
   59: {
   60:     return strcmp(((struct day_mon_map*)v1)->s, ((struct day_mon_map*)v2)->s);
   61: }
   62: 
   63: void tdate_init(void)
   64: {
   65:     qsort(wday_tab, sizeof(wday_tab)/sizeof(struct day_mon_map),
   66:             sizeof(struct day_mon_map), 
   67:             (int (*)(const void *, const void *))day_mon_map_compare);
   68:     qsort(mon_tab, sizeof(mon_tab)/sizeof(struct day_mon_map),
   69:             sizeof(struct day_mon_map), 
   70:             (int (*)(const void *, const void *))day_mon_map_compare);
   71: }
   72: 
   73: static int8_t day_mon_map_search(const char* str, 
   74:                             const struct day_mon_map* tab, int n)
   75: {
   76:     struct day_mon_map *search = bsearch(&str, tab, n,
   77:             sizeof(struct day_mon_map), 
   78:                 (int (*)(const void *, const void *))day_mon_map_compare);
   79:     return search ? search->l : -1;
   80: }
   81: 
   82: time_t tdate_parse(const char* str)
   83: {
   84:     struct tm tm;
   85:     char str_mon[4], str_wday[4];
   86:     int tm_sec, tm_min, tm_hour, tm_mday, tm_year;
   87: 
   88:     /* Initialize. */
   89:     memset(&tm, 0, sizeof(struct tm));
   90: 
   91:     /* wdy, DD mth YY HH:MM:SS GMT */
   92:     if (sscanf(str, "%3[a-zA-Z], %d %3[a-zA-Z] %d %d:%d:%d GMT",
   93:                 str_wday, &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
   94:                     &tm_sec) == 7)
   95:     {
   96:         int8_t tm_wday = day_mon_map_search(str_wday, wday_tab, 
   97:                         sizeof(wday_tab)/sizeof(struct day_mon_map));
   98:         int8_t tm_mon = day_mon_map_search(str_mon, mon_tab, 
   99:                         sizeof(mon_tab)/sizeof(struct day_mon_map));
  100: 
  101:         if (tm_wday < 0 || tm_mon < 0)
  102:             return -1;
  103: 
  104:         tm.tm_wday = tm_wday;
  105:         tm.tm_mon = tm_mon;
  106:         tm.tm_mday = tm_mday;
  107:         tm.tm_hour = tm_hour;
  108:         tm.tm_min = tm_min;
  109:         tm.tm_sec = tm_sec;
  110:         tm.tm_year = tm_year - 1900;
  111:         return mktime(&tm);
  112:     }
  113: 
  114:     return -1;  /* error */
  115: }