parse_expires.c

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/*
 * $Id$
 *
 * Expires header field body parser
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of ser, a free SIP server.
 *
 * ser 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
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    info@iptel.org
 *
 * ser 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
 *
 * History:
 * --------
 * 2003-04-26 ZSW (jiri)
 */

#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(&tmp);

        if (tmp.len == 0) {
                LOG(L_ERR, "expires_parser(): Empty body\n");
                _e->valid = 0;
                return -1;
        }

        _e->text.s = tmp.s;
        _e->text.len = tmp.len;

        /* more then 32bit/maxuint cant be valid */
        if (tmp.len > 10) {
                _e->valid = 0;
                return 0;
        }

        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
                                      */
                                     /*
                                LOG(L_ERR, "expires_parser(): Invalid character\n");
                                return -2;
                                     */
                                _e->valid = 0;
                                return 0;
                        }
                }
        }

        _e->valid = 1;
        return 0;
}


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) {
                LOG(L_ERR, "parse_expires(): No memory left\n");
                return -1;
        }
        
        memset(e, 0, sizeof(exp_body_t));

        if (expires_parser(_h->body.s, _h->body.len, e) < 0) {
                LOG(L_ERR, "parse_expires(): Error while parsing\n");
                pkg_free(e);
                return -2;
        }
        
        _h->parsed = (void*)e;
        return 0;
}


void free_expires(exp_body_t** _e)
{
        pkg_free(*_e);
        *_e = 0;
}


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");
}