parse_expires.c

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/*
 * $Id: parse_expires.c 4720 2008-08-23 10:56:15Z henningw $
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*!
 * \file
 * \brief Expires header field body parser
 * \ingroup parser
 */

#include "parse_expires.h"
#include <stdio.h>          /* printf */
#include "../mem/mem.h"     /* pkg_malloc, pkg_free */
#include "../dprint.h"
#include "../trim.h"        /* trim_leading */
#include <string.h>         /* memset */
#include "../ut.h"


static inline int expires_parser(char* _s, int _l, exp_body_t* _e)
{
   int i;
   str tmp;
   
   tmp.s = _s;
   tmp.len = _l;

   trim_leading(&tmp);

   if (tmp.len == 0) {
      LM_ERR("empty body\n");
      _e->valid = 0;
      return -1;
   }

   _e->text.s = tmp.s;

   for(i = 0; i < tmp.len; i++) {
      if ((tmp.s[i] >= '0') && (tmp.s[i] <= '9')) {
         _e->val *= 10;
         _e->val += tmp.s[i] - '0';
      } else {
         switch(tmp.s[i]) {
         case ' ':
         case '\t':
         case '\r':
         case '\n':
            _e->text.len = i;
            _e->valid = 1;
            return 0;

         default:
                 /* Exit normally here, we want to be backwards compatible with
                  * RFC2543 entities that can put absolute time here
                  */
                 /*
            LM_ERR("invalid character\n");
            return -2;
                 */
            _e->valid = 0;
            return 0;
         }
      }
   }

   _e->text.len = _l;
   _e->valid = 1;
   return 0;
}


/*!
 * Parse expires header field body
 */
int parse_expires(struct hdr_field* _h)
{
   exp_body_t* e;

   if (_h->parsed) {
      return 0;  /* Already parsed */
   }

   e = (exp_body_t*)pkg_malloc(sizeof(exp_body_t));
   if (e == 0) {
      LM_ERR("no pkg memory left\n");
      return -1;
   }
   
   memset(e, 0, sizeof(exp_body_t));

   if (expires_parser(_h->body.s, _h->body.len, e) < 0) {
      LM_ERR("failed to parse\n");
      pkg_free(e);
      return -2;
   }
   
   _h->parsed = (void*)e;
   return 0;
}


/*!
 * Free all memory associated with exp_body_t
 */
void free_expires(exp_body_t** _e)
{
   pkg_free(*_e);
   *_e = 0;
}


/*!
 * Print exp_body_t content, for debugging only
 */
void print_expires(exp_body_t* _e)
{
   printf("===Expires===\n");
   printf("text: \'%.*s\'\n", _e->text.len, ZSW(_e->text.s));
   printf("val : %d\n", _e->val);
   printf("===/Expires===\n");
}