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void tconfig_merge(struct tconfig_block *src, struct tconfig_block *dst){  struct tconfig_block *tmp;  int depth = 0;  /* We want to start at the initial positions and traverse down from   * there, copying the keys and values and subkeys maintaining current   * order if it already exists.   */  if (src == NULL)    return dst;  else if (dst == NULL)    return src;  while (src != NULL)  {    if (src->child != NULL)    {      tmp = dst;      /* Make sure it's at the beginning */      while (tmp->prev != NULL) tmp = tmp->prev;      while (tmp != NULL)      {        if (tmp->key != NULL)        {          if (!strcmp(src->key,tmp->key) && !strcmp(src->value,tmp->value))          {            /* It's a match, merely attach to it */            dst = tmp->child;            break;          }        }        tmp = tmp->next;      }      if (tmp == NULL)      {        /* No matches, create they key/value parent node */        while (dst->next != NULL && dst->key != NULL) dst = dst->next;        if (dst->key != NULL)        {          dst->next = tmalloc(sizeof(struct tconfig_block));          dst->next->prev    = dst;          dst->next->next    = NULL;          dst                = dst->next;        }        dst->key           = tstrdup(tmp->key);        dst->value         = tstrdup(tmp->value);        dst->parent        = NULL;        dst->child         = tmalloc(sizeof(struct tconfig_block));        dst->child->parent = dst;        dst                = dst->child;        dst->key           = NULL;        dst->value         = NULL;        dst->child         = NULL;      }      depth++;      src = src->child;      continue;    }    if (src->next != NULL)    {      tmp = dst;      /* Make sure it's at the beginning */      while (tmp->prev != NULL) tmp = tmp->prev;      while (tmp != NULL)      {        if (tmp->key != NULL)        {          if (!strcmp(src->key,tmp->key) && !strcmp(src->value,tmp->value))          {            /* Ignore dupes */            break;          }        }        tmp = tmp->next;      }      if (tmp == NULL)      {        /* go to the end of the list */        while (dst->next != NULL && dst->key != NULL) dst = dst->next;        if (dst->key != NULL)        {          dst->next       = tmalloc(sizeof(struct tconfig_block));          dst->next->prev = dst;          dst             = dst->next;          dst->next       = NULL;          dst->parent     = NULL;          dst->child      = NULL;        }        dst->key        = tstrdup(src->key);        dst->value      = tstrdup(src->value);      }      src = src->next;      continue;    }    tmp = dst;    /* Make sure it's at the beginning */    while (tmp->prev != NULL) tmp = tmp->prev;    while (tmp != NULL)    {      if (tmp->key != NULL)      {        if (!strcmp(src->key,tmp->key) && !strcmp(src->value,tmp->value))        {          /* Ignore dupes */          break;        }      }      tmp = tmp->next;    }    if (tmp == NULL)    {      /* go to the end of the list */      while (dst->next != NULL && dst->key != NULL) dst = dst->next;      if (dst->key != NULL)      {        dst->next       = tmalloc(sizeof(struct tconfig_block));        dst->next->prev = dst;        dst             = dst->next;        dst->next       = NULL;        dst->parent     = NULL;        dst->child      = NULL;      }      dst->key        = tstrdup(src->key);      dst->value      = tstrdup(src->value);    }    while (src->next == NULL)    {      while (src->parent == NULL)      {        src = src->prev;        src = src->parent;        depth--;        if (depth == 0)          break;      }    }    src = src->next;  }}