read_cfg

int get_cfg_value(char *psz_cfg_value, char *psz_cfg_id, FILE *f_descriptor)
{ 
    if (NULL == psz_cfg_value || NULL == psz_cfg_id || NULL == f_descriptor)
    {

        return E_INVALIDARG;
    }

    char *psz_iterator;
    char psz_cfg_item[MAX_CFG_LEN];
    int  i_iterator;

    memset(psz_cfg_item, 0x0, sizeof(psz_cfg_item));
    psz_iterator = NULL;
    i_iterator = 0;
    fseek(f_descriptor, 0, SEEK_SET);
    while ((fgets(psz_cfg_item, (sizeof(psz_cfg_item) - 1),
        f_descriptor)) != NULL)
    {

   char* psz_temp = psz_cfg_item;
         while (*psz_temp != '\0' && (' ' == *psz_temp || '\t' == *psz_temp))
       {
         psz_temp++;
       }
       if ('#' == psz_temp[0] || '\0' == psz_temp[0])
       {
          continue;
       }

        if ((strstr(psz_temp, psz_cfg_id)) != NULL)
        {
              psz_iterator = index(psz_temp, EQUAL_TAG);

            if (NULL == psz_iterator)
            {
                return E_INVALIDARG;   
            }

            psz_iterator++;

            while (*psz_iterator != '\0' && *psz_iterator != '\n')
            {
                psz_cfg_value[i_iterator] = *psz_iterator;
                i_iterator++;
                psz_iterator++;
            } 
            psz_cfg_value[i_iterator] = '\0';

            if (0 == strlen(psz_cfg_value))
            {
                return E_INVALIDARG;
            }
             return S_OK;
        }
    }

    return E_NOTFOUND;

}