lvalue.h
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 /* 
  * 
  * Copyright (C) 2008 iptelorg GmbH
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 /**
  * @file 
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  * @brief Kamailio core :: lvalues (assignment)
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  * @author andrei
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  */
 
 #ifndef __lvalue_h_
 #define __lvalue_h_
 
 #include "rvalue.h"
 #include "usr_avp.h"
 #include "pvar.h"
 #include "parser/msg_parser.h"
 #include "action.h"
 
 union lval_u{
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 	pv_spec_t *pvs;
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 	avp_spec_t avps;
 };
 
 enum lval_type{
 	LV_NONE, LV_AVP, LV_PVAR
 };
 
 struct lvalue{
 	enum lval_type type;
 	union lval_u lv;
 };
 
 /* lval operators */
 #define EQ_T 254 /* k compatibility */
 
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 typedef int (*log_assign_action_f)(struct sip_msg* msg, struct lvalue *lv);
 void set_log_assign_action_cb(log_assign_action_f f);
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 /** eval rve and assign the result to lv
  * lv=eval(rve)
  *
  * @param h  - script context
  * @param msg - sip msg
  * @param lv - lvalue
  * @param rve - rvalue expression
  * @return >= 0 on success (expr. bool value), -1 on error
  */
 int lval_assign(struct run_act_ctx* h, struct sip_msg* msg, 
 				struct lvalue* lv, struct rval_expr* rve);
 #endif /* __lvalue_h_*/