replace_fields.c

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/*
 *  $Id: replace_fields.c,v 1.9 2006/04/17 22:45:19 ghost666 Exp $
 *
 *  rssbgr - RSS backgroud reader
 *  Copyright (C) 2005, 2006 Piotr 'GhosT' Wydrych
 *
 *  This program 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.
 *
 *  This program 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
 */

#include "replace_fields.h"

char *replace_all(char *subject, char *this, char *that)
{
 size_t pos_sub = 0, len_sub = strlen(subject);
 size_t pos_res = 0;
 char *pos_fnd = NULL;
 size_t len_this = strlen(this), len_that = strlen(that);
 char *result = NULL;

 while ((pos_fnd = strstr(subject+pos_sub, this)) != NULL)
 {
  if ((result = (char *)realloc(result, pos_res+(size_t)pos_fnd-(size_t)(subject+pos_sub)+len_that+1)) == NULL) return NULL;
  strlcpy(result+pos_res, subject+pos_sub, (size_t)pos_fnd-(size_t)(subject+pos_sub)+1);
  pos_res += (size_t)pos_fnd-(size_t)(subject+pos_sub);
  pos_sub += (size_t)pos_fnd-(size_t)(subject+pos_sub);
  strlcpy(result+pos_res, that, len_that+1);
  pos_res += len_that;
  pos_sub += len_this;
 }
 if ((result = (char *)realloc(result, pos_res+len_sub-pos_sub+1)) == NULL) return NULL;
 strlcpy(result+pos_res, subject+pos_sub, len_sub-pos_sub+1);
 return result;
}

char *replace_fields(char *format, char *channel_link, char *channel_title, char *channel_desc, char *item_link, char *item_title, char *item_desc)
{
 char *result_old, *result_new;

 if (channel_link == NULL) channel_link = "";
 if (channel_title == NULL) channel_title = "";
 if (channel_desc == NULL) channel_desc = "";

 if (item_link == NULL) item_link = "";
 if (item_title == NULL) item_title = "";
 if (item_desc == NULL) item_desc = "";

 result_old = (char *)malloc(strlen(format)+1);

 strcpy(result_old, format);
 result_new = replace_all(result_old, "{L}", channel_link);
 free(result_old);

 result_old = (char *)malloc(strlen(result_new)+1);
 strcpy(result_old, result_new);
 free(result_new);

 result_new = replace_all(result_old, "{T}", channel_title);
 free(result_old);

 result_old = (char *)malloc(strlen(result_new)+1);
 strcpy(result_old, result_new);
 free(result_new);

 result_new = replace_all(result_old, "{D}", channel_desc);
 free(result_old);

 result_old = (char *)malloc(strlen(result_new)+1);
 strcpy(result_old, result_new);
 free(result_new);

 result_new = replace_all(result_old, "{l}", item_link);
 free(result_old);

 result_old = (char *)malloc(strlen(result_new)+1);
 strcpy(result_old, result_new);
 free(result_new);

 result_new = replace_all(result_old, "{t}", item_title);
 free(result_old);

 result_old = (char *)malloc(strlen(result_new)+1);
 strcpy(result_old, result_new);
 free(result_new);

 result_new = replace_all(result_old, "{d}", item_desc);
 free(result_old);

 result_old = (char *)malloc(strlen(result_new)+1);
 strcpy(result_old, result_new);
 free(result_new);

 result_new = replace_all(result_old, "\\}", "}");
 free(result_old);

 result_old = (char *)malloc(strlen(result_new)+1);
 strcpy(result_old, result_new);
 free(result_new);

 result_new = replace_all(result_old, "\'", "\\\'");
 free(result_old);

 result_old = (char *)malloc(strlen(result_new)+1);
 strcpy(result_old, result_new);
 free(result_new);

 result_new = replace_all(result_old, "\\\\", "\\");
 free(result_old);

 return result_new;
}

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