XSPICE square: remove memory leak, initialize phase1

src/xspice/examples/analog_models4_transient.deck

@@ -53,7 +53,12 @@ a5 3 1 0 50 oneshot1
 +                        retrig=FALSE)
 *
 *
-*
+*** square block ***
+a6 2 60 square1
+.model square1 square (cntl_array=[-1.0 0.0 10.0 20.0]
++                  freq_array=[500 500 7000 7000]
++                  out_low=-0.8 out_high=1.2 duty_cycle=0.5
++                  rise_time=1e-6 fall_time=2e-6)
 *
 *** resistors to ground ***
 r1 1 0 10k

src/xspice/icm/analog/square/cfunc.mod

@@ -69,6 +69,18 @@ NON-STANDARD FEATURES
 
 
 
+typedef struct {
+
+    double   *control;   /* the storage array for the
+                            control vector (cntl_array)   */
+
+    double   *freq;   /* the storage array for the
+                         pulse width array (pw_array)   */
+
+    Boolean_t tran_init; /* for initialization of phase1) */
+
+} Local_Data_t;
+
 
 /*=== FUNCTION PROTOTYPE DEFINITIONS ===*/
 
@@ -179,6 +191,9 @@ void cm_square(ARGS)  /* structure holding parms,
 
     Mif_Complex_t ac_gain;
 
+    Local_Data_t *loc;        /* Pointer to local static data, not to be included
+                                       in the state vector */
+
     /**** Retrieve frequently used parameters... ****/
 
     cntl_size = PARAM_SIZE(cntl_array);
@@ -205,6 +220,24 @@ void cm_square(ARGS)  /* structure holding parms,
         cm_analog_alloc(T3,sizeof(double));
         cm_analog_alloc(T4,sizeof(double));
 
+        /*** allocate static storage for *loc ***/
+        STATIC_VAR (locdata) = calloc (1 , sizeof ( Local_Data_t ));
+        loc = STATIC_VAR (locdata);
+
+        /* Allocate storage for breakpoint domain & pulse width values */
+        x = loc->control = (double *) calloc((size_t) cntl_size, sizeof(double));
+        if (!x) {
+            cm_message_send(square_allocation_error);
+            return;
+        }
+        y = loc->freq = (double *) calloc((size_t) freq_size, sizeof(double));
+        if (!y) {
+            cm_message_send(square_allocation_error);
+            return;
+        }
+
+        loc->tran_init = FALSE;
+
     }
 
     if(ANALYSIS == MIF_DC) {
@@ -239,18 +272,13 @@ void cm_square(ARGS)  /* structure holding parms,
         time3 = *t3;
         time4 = *t4;
 
-        /* Allocate storage for breakpoint domain & freq. range values */
-
-        x = (double *) calloc((size_t) cntl_size, sizeof(double));
-        if (!x) {
-            cm_message_send(square_allocation_error);
-            return;
-        }
+        loc = STATIC_VAR (locdata);
+        x = loc->control;
+        y = loc->freq;
 
-        y = (double *) calloc((size_t) freq_size, sizeof(double));
-        if (!y) {
-            cm_message_send(square_allocation_error);
-            return;
+        if (!loc->tran_init) {
+            *phase1 = 0.0;
+            loc->tran_init = TRUE;
         }
 
         /* Retrieve x and y values. */
@@ -301,7 +329,7 @@ void cm_square(ARGS)  /* structure holding parms,
         *phase = *phase1 + freq*(TIME - T(1));
 
         /* convert the phase to an integer */
-        int_cycle = *phase1;
+        int_cycle = (int)*phase1;
 
         /* dphase is the percent into the cycle for
            the period */

src/xspice/icm/analog/square/ifspec.ifs

@@ -20,7 +20,7 @@ NAME_TABLE:
 
 
 C_Function_Name:       cm_square
-Spice_Model_Name:      square 
+Spice_Model_Name:      square
 Description:           "controlled square wave oscillator"
 
 
@@ -80,3 +80,9 @@ Vector:              no
 Vector_Bounds:       -
 Null_Allowed:       yes
 
+
+STATIC_VAR_TABLE:
+
+Static_Var_Name:    locdata
+Description:        "local static data"
+Data_Type:          pointer