Efficiency: Remove setting the random seed to behind the options selection

Evaluate '.options cshunt=xx' earlier to allow the following:
Set the option by calling INPpas4() during parsing the circuit,
before .ic is set.
Ckt and Task cshunt are still set, but their values are available
only too late for INPpas4(), but may be used by command 'option'
(w/o parameters) for assessing the options and their values.

src/frontend/com_option.c

@@ -76,6 +76,7 @@ com_option(wordlist *wl)
         printf("gmin     (devices)  = %g\n", circuit->CKTgmin);
         printf("diaggmin (stepping) = %g\n", circuit->CKTdiagGmin);
         printf("gshunt = %g\n", circuit->CKTgshunt);
+        printf("cshunt = %g\n", circuit->CKTcshunt);
 
         printf("delmin = %g\n", circuit->CKTdelmin);
 

src/frontend/inp.c

@@ -394,33 +394,34 @@ inp_remove_recent(void) {
         line_free(recent_deck, TRUE);
 }
 
-/* check for .option seed=[val|random] and set the random number generator */
+
+/* Check for .option seed=[val|random] and set the random number generator.
+   Check for .option cshunt=val and set a global variable
+   Input is the option deck (already sorted for .option) */
 void
-eval_seed_opt(struct card *deck)
+eval_opt(struct card* deck)
 {
-    struct card *card;
+    struct card* card;
     bool has_seed = FALSE;
+    bool has_cshunt = FALSE;
 
     for (card = deck; card; card = card->nextcard) {
-        char *line = card->line;
-        if (*line == '*')
-            continue;
-        if (ciprefix(".option", line) || ciprefix("option", line)) {
-            /* option seedinfo */
+        char* line = card->line;
+
         if (strstr(line, "seedinfo"))
             setseedinfo();
-            char *begtok = strstr(line, "seed=");
+        char* begtok = strstr(line, "seed=");
         if (begtok)
             begtok = &begtok[5]; /*skip seed=*/
         if (begtok) {
             if (has_seed)
                 fprintf(cp_err, "Warning: Multiple 'option seed=val|random' found!\n");
-                char *token = gettok(&begtok);
+            char* token = gettok(&begtok);
             /* option seed=random [seed='random'] */
             if (eq(token, "random") || eq(token, "{random}")) {
                 time_t acttime = time(NULL);
                 /* get random value from time in seconds since 1.1.1970 */
-                    int rseed = (int)(acttime - 1470000000);
+                int rseed = (int)(acttime - 1600000000);
                 cp_vset("rndseed", CP_NUM, &rseed);
                 com_sseed(NULL);
                 has_seed = TRUE;
@@ -438,6 +439,22 @@ eval_seed_opt(struct card *deck)
             }
             tfree(token);
         }
+
+        begtok = strstr(line, "cshunt=");
+        if (begtok)
+            begtok = &begtok[7]; /*skip cshunt=*/
+        if (begtok) {
+            int err = 0;
+            if (has_cshunt)
+                fprintf(cp_err, "Warning: Multiple '.option cshunt=val' found!\n");
+            /* option cshunt=val*/
+            double sr = INPevaluate(&begtok, &err, 0);
+            if (sr <= 0 || err)
+                fprintf(cp_err, "Warning: Cannot convert 'option cshunt=%s' to capacitor value, skipped!\n", begtok);
+            else {
+                cp_vset("cshunt_value", CP_REAL, &sr);
+                has_cshunt = TRUE;
+            }
         }
     }
 }
@@ -483,8 +500,6 @@ inp_spsource(FILE *fp, bool comfile, char *filename, bool intfile)
     if (fp || intfile) {
         deck = inp_readall(fp, dir_name, comfile, intfile, &expr_w_temper);
 
-        /* here we check for .option seed=[val|random] and set the random number generator */
-        eval_seed_opt(deck);
         /* files starting with *ng_script are user supplied command files */
         if (deck && ciprefix("*ng_script", deck->line))
             comfile = TRUE;
@@ -557,7 +572,9 @@ inp_spsource(FILE *fp, bool comfile, char *filename, bool intfile)
         /* Extract the .option lines from the deck into 'options',
            and remove them from the deck. */
         options = inp_getopts(deck);
-
+        /* Check for .option seed=[val|random] and set the random number generator.
+           Check for .option cshunt=val and set a global variable cshunt_value */
+        eval_opt(options);
         /* copy a deck before subckt substitution. */
         realdeck = inp_deckcopy(deck);
 
@@ -1336,10 +1353,6 @@ inp_dodeck(
         }
     } // if (!noparse)  . . .
 
-    /* If option cshunt is given, add capacitors to each voltage node */
-    if (ft_curckt->ci_defTask->TSKcshunt > 0.)
-        INPpas4(ckt, tab);
-
     /* add title of deck to data base */
     /* this won't work if the title is the empty string
     *    cp_addkword() doesn't work for tt === ""

src/frontend/spiceif.c

@@ -167,6 +167,9 @@ if_inpdeck(struct card *deck, INPtables **tab)
     /* Scan through the instance lines and parse the circuit. */
     INPpas2(ckt, deck->nextcard, *tab, ft_curckt->ci_defTask);
 
+    /* If option cshunt is given, add capacitors to each voltage node */
+    INPpas4(ckt, *tab);
+
     /* Fill in .NODESET and .IC data.
      * nodeset/ic of non-existent nodes is rejected.  */
     INPpas3(ckt, deck->nextcard,
@@ -1450,6 +1453,7 @@ void com_snload(wordlist *wl)
 
     _t(CKTgmin);
     _t(CKTgshunt);
+    _t(CKTcshunt);
     _t(CKTdelmin);
     _t(CKTtrtol);
     _t(CKTfinalTime);

src/spicelib/analysis/cktntask.c

@@ -57,6 +57,7 @@ CKTnewTask(CKTcircuit *ckt, TSKtask **taskPtr, IFuid taskName, TSKtask **defPtr)
         tsk->TSKvoltTol         = def->TSKvoltTol;
         tsk->TSKgmin            = def->TSKgmin;
         tsk->TSKgshunt          = def->TSKgshunt;
+        tsk->TSKcshunt          = def->TSKcshunt;
         /* delmin */
         tsk->TSKtrtol           = def->TSKtrtol;
         tsk->TSKdefaultMosM     = def->TSKdefaultMosM;

src/spicelib/parser/inppas4.c

@@ -25,7 +25,7 @@ Author: 1985 Thomas L. Quarles
 
 /* pass 4 - If option cshunt is given,
 add a capacitor to each voltage node */
-void INPpas4(CKTcircuit *ckt, INPtables * tab)
+void INPpas4(CKTcircuit *ckt, INPtables *tab)
 {
     CKTnode* node;
     int mytype = -1;
@@ -34,6 +34,11 @@ void INPpas4(CKTcircuit *ckt, INPtables * tab)
     GENinstance* fast;   /* pointer to the actual instance */
     IFvalue ptemp;       /* a value structure to package capacitance into */
     int nadded = 0;      /* capacitors added */
+    double csval = 0.;        /* cshunt capacitors value */
+
+    /* get the cshunt value */
+    if (!cp_getvar("cshunt_value", CP_REAL, &csval, 0))
+        return;
 
     if ((mytype = INPtypelook("Capacitor")) < 0) {
         fprintf(stderr, "Device type Capacitor not supported by this binary\n");
@@ -57,7 +62,7 @@ void INPpas4(CKTcircuit *ckt, INPtables * tab)
             (*(ft_sim->bindNode))(ckt, fast, 1, node);
 
             /* value of the capacitance */
-            ptemp.rValue = ft_curckt->ci_defTask->TSKcshunt;
+            ptemp.rValue = csval;
             error = INPpName("capacitance", &ptemp, ckt, mytype, fast);
 
             /* add device numbers for statistics */
@@ -68,5 +73,5 @@ void INPpas4(CKTcircuit *ckt, INPtables * tab)
             nadded++;
         }
     }
-    printf("Option cshunt: %d capacitors added with %g F each\n", nadded, ft_curckt->ci_defTask->TSKcshunt);
+    printf("Option cshunt: %d capacitors added with %g F each\n", nadded, csval);
 }