added qse_awk_pushecb()/qse_awk_popecb()/qse_sed_pushecb()/qse_sed_popecb()/qse_httpd_pushecb()/qse_httpd_popecb().

started reorganizing samples/httpd01 to net/httpd-std.c

qse/cmd/awk/awk.c

@@ -350,8 +350,7 @@ static void dprint_return (qse_awk_rtx_t* rtx, qse_awk_val_t* ret)
 }
 
 #ifdef ENABLE_CALLBACK
-static void on_statement (
+static void on_statement (qse_awk_rtx_t* rtx, qse_awk_nde_t* nde)
-	qse_awk_rtx_t* rtx, qse_awk_nde_t* nde, void* data)
 {
 	dprint (QSE_T("running %d at line %d\n"), (int)nde->type, (int)nde->loc.line);
 }
@@ -975,13 +974,18 @@ static int awk_main (int argc, qse_char_t* argv[])
 	qse_awk_t* awk = QSE_NULL;
 	qse_awk_rtx_t* rtx = QSE_NULL;
 	qse_awk_val_t* retv;
-#ifdef ENABLE_CALLBACK
-	qse_awk_rcb_t rcb;
-#endif
 	int i;
 	struct arg_t arg;
 	int ret = -1;
 
+#ifdef ENABLE_CALLBACK
+	static qse_awk_rtx_ecb_t rtx_ecb =
+	{
+		QSE_FV(.close, QSE_NULL),
+		QSE_FV(.stmt, on_statement)
+	};
+#endif
+
 	/* TODO: change it to support multiple source files */
 	qse_awk_parsestd_t psin;
 	qse_awk_parsestd_t psout;
@@ -1080,12 +1084,6 @@ static int awk_main (int argc, qse_char_t* argv[])
 		goto oops;
 	}
 
-#ifdef ENABLE_CALLBACK
-	qse_memset (&rcb, 0, QSE_SIZEOF(rcb));
-	rcb.stmt = on_statement;
-	rcb.ctx = &arg;
-#endif
-
 	rtx = qse_awk_rtx_openstd (
 		awk, 0, QSE_T("qseawk"),
 		(const qse_char_t*const*)arg.icf.ptr,
@@ -1104,7 +1102,7 @@ static int awk_main (int argc, qse_char_t* argv[])
 	
 	app_rtx = rtx;
 #ifdef ENABLE_CALLBACK
-	qse_awk_rtx_pushrcb (rtx, &rcb);
+	qse_awk_rtx_pushecb (rtx, &rtx_ecb);
 #endif
 
 	set_intr_run ();

qse/include/qse/awk/awk.h

@@ -617,6 +617,8 @@ struct qse_awk_prm_t
 };
 typedef struct qse_awk_prm_t qse_awk_prm_t;
 
+/* ------------------------------------------------------------------------ */
+
 /**
  * The qse_awk_sio_t type defines a script stream handler set.
  * The qse_awk_parse() function calls the input and output handler to parse
@@ -664,6 +666,8 @@ struct qse_awk_sio_t
 };
 typedef struct qse_awk_sio_t qse_awk_sio_t;
 
+/* ------------------------------------------------------------------------ */
+
 /**
  * The qse_awk_rio_t type defines a runtime I/O handler set.
  * @sa qse_awk_rtx_t
@@ -676,56 +680,93 @@ struct qse_awk_rio_t
 };
 typedef struct qse_awk_rio_t qse_awk_rio_t;
 
+/* ------------------------------------------------------------------------ */
+
 /**
- * The qse_awk_rcb_close_t type defines the callback function
+ * The qse_awk_ecb_close_t type defines the callback function
+ * called when an awk object is closed.
+ */
+typedef void (*qse_awk_ecb_close_t) (
+	qse_awk_t* awk  /**< awk */
+);
+
+/**
+ * The qse_awk_ecb_clear_t type defines the callback function
+ * called when an awk object is cleared.
+ */
+typedef void (*qse_awk_ecb_clear_t) (
+	qse_awk_t* awk  /**< awk */
+);
+
+/**
+ * The qse_awk_ecb_t type defines an event callback set.
+ * You can register a callback function set with
+ * qse_awk_pushecb().  The callback functions in the registered
+ * set are called in the reverse order of registration.
+ */
+typedef struct qse_awk_ecb_t qse_awk_ecb_t;
+struct qse_awk_ecb_t
+{
+	/**
+	 * called by qse_awk_close().
+	 */
+	qse_awk_ecb_close_t close;
+
+	/**
+	 * called by qse_awk_clear().
+	 */
+	qse_awk_ecb_clear_t clear;
+
+	/* internal use only. don't touch this field */
+	qse_awk_ecb_t* next;
+};
+
+/* ------------------------------------------------------------------------ */
+
+/**
+ * The qse_awk_rtx_ecb_close_t type defines the callback function
  * called when the runtime context is closed.
  */
-typedef void (*qse_awk_rcb_close_t) (
+typedef void (*qse_awk_rtx_ecb_close_t) (
-	qse_awk_rtx_t* rtx, /**< runtime context */
+	qse_awk_rtx_t* rtx  /**< runtime context */
-	void*          ctx  /**< user-defined data */
 );
 
 
 /**
- * The qse_awk_rcb_stmt_t type defines the callback function for each
+ * The qse_awk_rtx_ecb_stmt_t type defines the callback function for each
  * statement.
  */
-typedef void (*qse_awk_rcb_stmt_t) (
+typedef void (*qse_awk_rtx_ecb_stmt_t) (
 	qse_awk_rtx_t* rtx, /**< runtime context */
-	qse_awk_nde_t* nde, /**< node */
+	qse_awk_nde_t* nde  /**< node */
-	void*          ctx  /**< user-defined data */
 );
 
 /**
- * The qse_awk_rcb_t type defines a runtime callback set. You can 
+ * The qse_awk_rtx_ecb_t type defines an event callback set for a
- * register a callback function set with qse_awk_rtx_pushrcb(). 
+ * runtime context. You can register a callback function set with
- * The callback functions in the set registered are called in a 
+ * qse_awk_rtx_pushecb().  The callback functions in the registered
- * proper context in the reverse order of registeration.
+ * set are called in the reverse order of registration.
  */
-typedef struct qse_awk_rcb_t qse_awk_rcb_t;
+typedef struct qse_awk_rtx_ecb_t qse_awk_rtx_ecb_t;
-struct qse_awk_rcb_t
+struct qse_awk_rtx_ecb_t
 {
 	/**
 	 * called by qse_awk_rtx_close().
 	 */
-	qse_awk_rcb_close_t close;
+	qse_awk_rtx_ecb_close_t close;
 
 	/**
 	 * called by qse_awk_rtx_loop() and qse_awk_rtx_call() for
 	 * each statement executed.
 	 */
-	qse_awk_rcb_stmt_t stmt;
+	qse_awk_rtx_ecb_stmt_t stmt;
-
-	/**
-	 * A caller may store a user-defined data pointer into this field. This
-	 * is passed to an actual callback.
-	 */
-	void* ctx;
 
 	/* internal use only. don't touch this field */
-	qse_awk_rcb_t* next;
+	qse_awk_rtx_ecb_t* next;
 };
 
+/* ------------------------------------------------------------------------ */
+
 /**
  * The qse_awk_option_t type defines various options to change the behavior
  * of #qse_awk_t.
@@ -1381,6 +1422,23 @@ void qse_awk_setmaxdepth (
 	qse_size_t depth  /**< maximum depth */
 );
 
+/**
+ * The qse_awk_popecb() function pops an awk event callback set
+ * and returns the pointer to it. If no callback set can be popped,
+ * it returns #QSE_NULL.
+ */
+qse_awk_ecb_t* qse_awk_popecb (
+	qse_awk_t* awk /**< awk */
+);
+
+/**
+ * The qse_awk_pushecb() function register a runtime callback set.
+ */
+void qse_awk_pushecb (
+	qse_awk_t*     awk, /**< awk */
+	qse_awk_ecb_t* ecb  /**< callback set */
+);
+
 /**
  * The qse_awk_addgbl() function adds an intrinsic global variable.
  * @return the ID of the global variable added on success, -1 on failure.
@@ -1717,20 +1775,20 @@ void qse_awk_rtx_setrio (
 );
 
 /**
- * The qse_awk_rtx_poprcb() function pops a runtime callback set
+ * The qse_awk_rtx_popecb() function pops a runtime callback set
  * and returns the pointer to it. If no callback set can be popped,
  * it returns #QSE_NULL.
  */
-qse_awk_rcb_t* qse_awk_rtx_poprcb (
+qse_awk_rtx_ecb_t* qse_awk_rtx_popecb (
 	qse_awk_rtx_t* rtx /**< runtime context */
 );
 
 /**
- * The qse_awk_rtx_pushrcb() function register a runtime callback set.
+ * The qse_awk_rtx_pushecb() function register a runtime callback set.
  */
-void qse_awk_rtx_pushrcb (
+void qse_awk_rtx_pushecb (
-	qse_awk_rtx_t* rtx, /**< runtime context */
+	qse_awk_rtx_t*     rtx, /**< runtime context */
-	qse_awk_rcb_t* rcb  /**< callback set */
+	qse_awk_rtx_ecb_t* ecb  /**< callback set */
 );
 
 /**

qse/include/qse/macros.h

@@ -216,6 +216,15 @@
 		} \
 	)
 
+/**
+ * The QSE_FV() macro is used to specify a initial value
+ * for a field of an aggregate type.
+ */
+#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901)
+#	define QSE_FV(field,value) field = value
+#else
+#	define QSE_FV(field,value) value
+#endif
 
 /* number of characters to number of bytes */
 #define QSE_NCTONB(x) ((x)*sizeof(qse_char_t))

qse/include/qse/net/httpd.h

@@ -305,6 +305,32 @@ struct qse_httpd_client_t
 	} task;
 };
 
+/**
+ * The qse_httpd_ecb_close_t type defines the callback function
+ * called when an httpd object is closed.
+ */
+typedef void (*qse_httpd_ecb_close_t) (
+	qse_httpd_t* httpd  /**< httpd */
+);
+
+/**
+ * The qse_httpd_ecb_t type defines an event callback set.
+ * You can register a callback function set with
+ * qse_httpd_pushecb().  The callback functions in the registered
+ * set are called in the reverse order of registration.
+ */
+typedef struct qse_httpd_ecb_t qse_httpd_ecb_t;
+struct qse_httpd_ecb_t
+{
+	/**
+	 * called by qse_httpd_close().
+	 */
+	qse_httpd_ecb_close_t close;
+
+	/* internal use only. don't touch this field */
+	qse_httpd_ecb_t* next;
+};
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -344,6 +370,23 @@ void qse_httpd_setoption (
 	int          option
 );
 
+/**
+ * The qse_httpd_popecb() function pops an httpd event callback set
+ * and returns the pointer to it. If no callback set can be popped,
+ * it returns #QSE_NULL.
+ */
+qse_httpd_ecb_t* qse_httpd_popecb (
+	qse_httpd_t* httpd /**< httpd */
+);
+
+/**
+ * The qse_httpd_pushecb() function register a runtime callback set.
+ */
+void qse_httpd_pushecb (
+	qse_httpd_t*     httpd, /**< httpd */
+	qse_httpd_ecb_t* ecb  /**< callback set */
+);
+
 /**
  * The qse_httpd_loop() function starts a httpd server loop.
  */
@@ -360,7 +403,6 @@ void qse_httpd_stop (
 	qse_httpd_t* httpd
 );
 
-
 int qse_httpd_addserver (
 	qse_httpd_t*      httpd,
 	const qse_char_t* uri
@@ -502,6 +544,23 @@ void qse_httpd_freemem (
 	void*        ptr
 );
 
+/* -------------------------------------------- */
+
+
+qse_httpd_t* qse_httpd_openstd (
+	qse_size_t xtnsize
+);
+
+qse_httpd_t* qse_httpd_openstdwithmmgr (
+	qse_mmgr_t* mmgr,
+	qse_size_t  xtnsize
+);
+
+void* qse_httpd_getxtnstd (
+	qse_httpd_t* httpd
+);
+
+
 #ifdef __cplusplus
 }
 #endif

qse/include/qse/sed/sed.h

@@ -345,6 +345,32 @@ typedef int (*qse_sed_lformatter_t) (
 	int (*cwriter) (qse_sed_t*, qse_char_t)
 );
 
+/**
+ * The qse_sed_ecb_close_t type defines the callback function
+ * called when an sed object is closed.
+ */
+typedef void (*qse_sed_ecb_close_t) (
+	qse_sed_t* sed  /**< sed */
+);
+
+/**
+ * The qse_sed_ecb_t type defines an event callback set.
+ * You can register a callback function set with
+ * qse_sed_pushecb().  The callback functions in the registered
+ * set are called in the reverse order of registration.
+ */
+typedef struct qse_sed_ecb_t qse_sed_ecb_t;
+struct qse_sed_ecb_t
+{
+	/**
+	 * called by qse_sed_close().
+	 */
+	qse_sed_ecb_close_t close;
+
+	/* internal use only. don't touch this field */
+	qse_sed_ecb_t* next;
+};
+
 #ifdef QSE_ENABLE_SEDTRACER
 enum qse_sed_exec_op_t
 {
@@ -515,6 +541,23 @@ void qse_sed_seterror (
 	const qse_sed_loc_t* errloc  /**< error location */
 );
 
+/**
+ * The qse_sed_popecb() function pops an sed event callback set
+ * and returns the pointer to it. If no callback set can be popped,
+ * it returns #QSE_NULL.
+ */
+qse_sed_ecb_t* qse_sed_popecb (
+	qse_sed_t* sed /**< sed */
+);
+
+/**
+ * The qse_sed_pushecb() function register a runtime callback set.
+ */
+void qse_sed_pushecb (
+	qse_sed_t*     sed, /**< sed */
+	qse_sed_ecb_t* ecb  /**< callback set */
+);
+
 /**
  * The qse_sed_comp() function compiles editing commands into an internal form.
  * @return 0 on success, -1 on error 

qse/lib/awk/awk.c

@@ -262,8 +262,14 @@ oops:
 
 int qse_awk_close (qse_awk_t* awk)
 {
+	qse_awk_ecb_t* ecb;
+
 	if (qse_awk_clear (awk) <= -1) return -1;
 	/*qse_awk_clrfnc (awk);*/
+
+	for (ecb = awk->ecb; ecb; ecb = ecb->next)
+		if (ecb->close) ecb->close (awk);
+
 	qse_htb_close (awk->fnc.user);
 
 	qse_lda_close (awk->parse.params);
@@ -287,6 +293,11 @@ int qse_awk_close (qse_awk_t* awk)
 
 int qse_awk_clear (qse_awk_t* awk)
 {
+	qse_awk_ecb_t* ecb;
+
+     for (ecb = awk->ecb; ecb; ecb = ecb->next)
+          if (ecb->clear) ecb->clear (awk);
+
 	awk->stopall = QSE_FALSE;
 
 	clear_token (&awk->tok);
@@ -439,3 +450,18 @@ void qse_awk_setmaxdepth (qse_awk_t* awk, int types, qse_size_t depth)
 		awk->parse.depth.max.incl = depth;
 	}
 }
+
+
+qse_awk_ecb_t* qse_awk_popecb (qse_awk_t* awk)
+{
+	qse_awk_ecb_t* top = awk->ecb;
+	if (top) awk->ecb = top->next;
+	return top;
+}
+
+void qse_awk_pushecb (qse_awk_t* awk, qse_awk_ecb_t* ecb)
+{
+	ecb->next = awk->ecb;
+	awk->ecb = ecb;
+}
+

qse/lib/awk/awk.h

@@ -235,6 +235,7 @@ struct qse_awk_t
 	qse_awk_errinf_t errinf;
 
 	qse_bool_t stopall;
+	qse_awk_ecb_t* ecb;
 };
 
 struct qse_awk_chain_t
@@ -371,7 +372,7 @@ struct qse_awk_rtx_t
 	qse_awk_errinf_t errinf;
 
 	qse_awk_t* awk;
-	qse_awk_rcb_t* rcb;
+	qse_awk_rtx_ecb_t* ecb;
 };
 
 

qse/lib/awk/run.c

@@ -744,10 +744,10 @@ qse_awk_rtx_t* qse_awk_rtx_open (
 
 void qse_awk_rtx_close (qse_awk_rtx_t* rtx)
 {
-	qse_awk_rcb_t* rcb;
+	qse_awk_rtx_ecb_t* ecb;
 
-	for (rcb = rtx->rcb; rcb; rcb = rcb->next)
+	for (ecb = rtx->ecb; ecb; ecb = ecb->next)
-		if (rcb->close) rcb->close (rtx, rcb->ctx);
+		if (ecb->close) ecb->close (rtx);
 
 	/* NOTE:
 	 *  the close callbacks are called before data in rtx
@@ -784,17 +784,17 @@ void qse_awk_rtx_setrio (qse_awk_rtx_t* rtx, const qse_awk_rio_t* rio)
 	rtx->rio.handler[QSE_AWK_RIO_CONSOLE] = rio->console;
 }
 
-qse_awk_rcb_t* qse_awk_rtx_poprcb (qse_awk_rtx_t* rtx)
+qse_awk_rtx_ecb_t* qse_awk_rtx_popecb (qse_awk_rtx_t* rtx)
 {
-	qse_awk_rcb_t* top = rtx->rcb;
+	qse_awk_rtx_ecb_t* top = rtx->ecb;
-	if (top) rtx->rcb = top->next;
+	if (top) rtx->ecb = top->next;
 	return top;
 }
 
-void qse_awk_rtx_pushrcb (qse_awk_rtx_t* rtx, qse_awk_rcb_t* rcb)
+void qse_awk_rtx_pushecb (qse_awk_rtx_t* rtx, qse_awk_rtx_ecb_t* ecb)
 {
-	rcb->next = rtx->rcb;
+	ecb->next = rtx->ecb;
-	rtx->rcb = rcb;
+	rtx->ecb = ecb;
 }
 
 static void free_namedval (qse_htb_t* map, void* dptr, qse_size_t dlen)
@@ -1826,10 +1826,10 @@ static int run_block0 (qse_awk_rtx_t* rtx, qse_awk_nde_blk_t* nde)
 }
 
 #define ON_STATEMENT(rtx,nde) QSE_BLOCK ( \
-	qse_awk_rcb_t* rcb; \
+	qse_awk_rtx_ecb_t* ecb; \
 	if ((rtx)->awk->stopall) (rtx)->exit_level = EXIT_ABORT; \
-	for (rcb = (rtx)->rcb; rcb; rcb = rcb->next) \
+	for (ecb = (rtx)->ecb; ecb; ecb = ecb->next) \
-		if (rcb->stmt) rcb->stmt (rtx, nde, rcb->ctx);  \
+		if (ecb->stmt) ecb->stmt (rtx, nde);  \
 )
 
 static int run_statement (qse_awk_rtx_t* rtx, qse_awk_nde_t* nde)

qse/lib/awk/std.c

@@ -1478,7 +1478,7 @@ static qse_ssize_t awk_rio_console (
 	return -1;
 }
 
-static void fini_rxtn (qse_awk_rtx_t* rtx, void* ctx)
+static void fini_rxtn (qse_awk_rtx_t* rtx)
 {
 	rxtn_t* rxtn = (rxtn_t*) QSE_XTN (rtx);
 
@@ -1876,11 +1876,10 @@ qse_awk_rtx_t* qse_awk_rtx_openstd (
 	const qse_char_t*const ocf[],
 	qse_cmgr_t*            cmgr)
 {
-	static qse_awk_rcb_t rcb =
+	static qse_awk_rtx_ecb_t ecb =
 	{
-		fini_rxtn,	
+		QSE_FV (.close, fini_rxtn),
-		QSE_NULL,
+		QSE_FV (.stmt,  QSE_NULL)
-		QSE_NULL
 	};
 
 	qse_awk_rtx_t* rtx;
@@ -1921,7 +1920,7 @@ qse_awk_rtx_t* qse_awk_rtx_openstd (
 		rxtn->cmgrtab_inited = 1;
 	}
 
-	qse_awk_rtx_pushrcb (rtx, &rcb);
+	qse_awk_rtx_pushecb (rtx, &ecb);
 
 	rxtn->seed = (qse_gettime (&now) <= -1)? 0u: (qse_long_t)now;
 	/* i don't care if the seed becomes negative or overflows.

qse/lib/net/Makefile.am

@@ -16,6 +16,7 @@ libqsenet_la_SOURCES = \
 	httpd-cgi.c \
 	httpd-proxy.c \
 	httpd-resol.c \
+	httpd-std.c \
 	httpd-task.c \
 	upxd.c
 

qse/lib/net/Makefile.in

@@ -79,8 +79,8 @@ am__installdirs = "$(DESTDIR)$(libdir)"
 LTLIBRARIES = $(lib_LTLIBRARIES)
 libqsenet_la_DEPENDENCIES =
 am_libqsenet_la_OBJECTS = http.lo htre.lo htrd.lo httpd.lo \
-	httpd-cgi.lo httpd-proxy.lo httpd-resol.lo httpd-task.lo \
+	httpd-cgi.lo httpd-proxy.lo httpd-resol.lo httpd-std.lo \
-	upxd.lo
+	httpd-task.lo upxd.lo
 libqsenet_la_OBJECTS = $(am_libqsenet_la_OBJECTS)
 libqsenet_la_LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
@@ -273,6 +273,7 @@ libqsenet_la_SOURCES = \
 	httpd-cgi.c \
 	httpd-proxy.c \
 	httpd-resol.c \
+	httpd-std.c \
 	httpd-task.c \
 	upxd.c
 
@@ -358,6 +359,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/httpd-cgi.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/httpd-proxy.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/httpd-resol.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/httpd-std.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/httpd-task.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/httpd.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/upxd.Plo@am__quote@

qse/lib/net/httpd.c

@@ -84,6 +84,11 @@ qse_httpd_t* qse_httpd_open (qse_mmgr_t* mmgr, qse_size_t xtnsize)
 
 void qse_httpd_close (qse_httpd_t* httpd)
 {
+	qse_httpd_ecb_t* ecb;
+
+	for (ecb = httpd->ecb; ecb; ecb = ecb->next)
+		if (ecb->close) ecb->close (httpd);
+
 	qse_httpd_fini (httpd);
 	QSE_MMGR_FREE (httpd->mmgr, httpd);
 }
@@ -128,6 +133,23 @@ void qse_httpd_setoption (qse_httpd_t* httpd, int option)
 	httpd->option = option;
 }
 
+/* --------------------------------------------------- */
+
+qse_httpd_ecb_t* qse_httpd_popecb (qse_httpd_t* httpd)
+{
+	qse_httpd_ecb_t* top = httpd->ecb;
+	if (top) httpd->ecb = top->next;
+	return top;
+}
+
+void qse_httpd_pushecb (qse_httpd_t* httpd, qse_httpd_ecb_t* ecb)
+{
+	ecb->next = httpd->ecb;
+	httpd->ecb = ecb;
+}
+
+/* --------------------------------------------------- */
+
 QSE_INLINE void* qse_httpd_allocmem (qse_httpd_t* httpd, qse_size_t size)
 {
 	void* ptr = QSE_MMGR_ALLOC (httpd->mmgr, size);

qse/lib/net/httpd.h

@@ -29,7 +29,8 @@ struct qse_httpd_t
 {
 	QSE_DEFINE_COMMON_FIELDS (httpd)
 	qse_httpd_errnum_t errnum;
-	qse_httpd_cbs_t* cbs;
+	qse_httpd_ecb_t* ecb; /* event callbacks */
+	qse_httpd_cbs_t* cbs; 
 
 	int option;
 	int stopreq;

qse/lib/sed/sed.c

@@ -75,6 +75,11 @@ qse_sed_t* qse_sed_open (qse_mmgr_t* mmgr, qse_size_t xtnsize)
 
 void qse_sed_close (qse_sed_t* sed)
 {
+	qse_sed_ecb_t* ecb;
+
+	for (ecb = sed->ecb; ecb; ecb = ecb->next)
+		if (ecb->close) ecb->close (sed);
+
 	qse_sed_fini (sed);
 	QSE_MMGR_FREE (sed->mmgr, sed);
 }
@@ -4142,6 +4147,19 @@ void qse_sed_setlinenum (qse_sed_t* sed, qse_size_t num)
 	sed->e.in.num = num;
 }
 
+qse_sed_ecb_t* qse_sed_popecb (qse_sed_t* sed)
+{
+	qse_sed_ecb_t* top = sed->ecb;
+	if (top) sed->ecb = top->next;
+	return top;
+}
+
+void qse_sed_pushecb (qse_sed_t* sed, qse_sed_ecb_t* ecb)
+{
+	ecb->next = sed->ecb;
+	sed->ecb = ecb;
+}
+
 #ifdef QSE_ENABLE_SEDTRACER
 qse_sed_exec_tracer_t qse_sed_getexectracer (qse_sed_t* sed)
 {

qse/lib/sed/sed.h

@@ -99,6 +99,8 @@ struct qse_sed_t
 		} rex;
 	} depth;
 
+	qse_sed_ecb_t* ecb;
+
 	/** source text pointers */
 	struct
 	{