cleanup, use '\0' instead of 0 in char context

src/frontend/com_let.c

@@ -38,7 +38,7 @@ com_let(wordlist *wl)
     /* extract indices */
     numdims = 0;
     if ((rhs = strchr(p, '=')) != NULL) {
-        *rhs++ = 0;
+        *rhs++ = '\0';
     } else {
         fprintf(cp_err, "Error: bad let syntax\n");
         tfree(p);
@@ -47,7 +47,7 @@ com_let(wordlist *wl)
 
     if ((s = strchr(p, '[')) != NULL) {
         need_open = 0;
-        *s++ = 0;
+        *s++ = '\0';
         while (!need_open || *s == '[') {
             depth = 0;
             if (need_open)
@@ -75,7 +75,7 @@ com_let(wordlist *wl)
                 need_open = 0;
 
             if (*q)
-                *q++ = 0;
+                *q++ = '\0';
 
             /* evaluate expression between s and q */
             /* va, indexing */
@@ -120,7 +120,7 @@ com_let(wordlist *wl)
     for (q = p + strlen(p) - 1; *q <= ' ' && p <= q; q--)
         ;
 
-    *++q = 0;
+    *++q = '\0';
 
     /* sanity check */
     if (eq(p, "all") ||strchr(p, '@')) {

src/frontend/device.c

@@ -1280,11 +1280,11 @@ com_alter_common(wordlist *wl, int do_model)
             dev = p + 1;
             p = strchr(p, '[');
             if (p) {
-                *p++ = 0;
+                *p++ = '\0';
                 param = p;
                 p = strchr(p, ']');
                 if (p)
-                    *p = 0;
+                    *p = '\0';
             }
         } else {
             dev = p;

src/frontend/dotcards.c

@@ -601,7 +601,7 @@ gettoks(char *s)
             c = r;
 
         if (c)
-            *c = 0;
+            *c = '\0';
 
         wl = wl_cons(NULL, NULL);
         *prevp = wl;
@@ -617,7 +617,7 @@ gettoks(char *s)
         }
 
         if (c != r) {
-            *r = 0;
+            *r = '\0';
             wl = wl_cons(copy(c + 1), NULL);
             *prevp = wl;
             prevp = &wl->wl_next;

src/frontend/misccoms.c

@@ -180,9 +180,9 @@ com_version(wordlist *wl)
                 "** Copyright 1985-1994, Regents of the University of California.\n"
                 "** %s\n",
                 ft_sim->simulator, ft_sim->version, ft_sim->description, Spice_Manual);
-        if (Spice_Notice != NULL && *Spice_Notice != 0)
+        if (Spice_Notice != NULL && *Spice_Notice != '\0')
             fprintf(cp_out, "** %s\n", Spice_Notice);
-        if (Spice_Build_Date != NULL && *Spice_Build_Date != 0)
+        if (Spice_Build_Date != NULL && *Spice_Build_Date != '\0')
             fprintf(cp_out, "** Creation Date: %s\n", Spice_Build_Date);
         fprintf(cp_out, "******\n");
 
@@ -197,9 +197,9 @@ com_version(wordlist *wl)
                     "** %s-%s\n"
                     "** %s\n",
                     ft_sim->simulator, ft_sim->version, Spice_Manual);
-            if (Spice_Notice != NULL && *Spice_Notice != 0)
+            if (Spice_Notice != NULL && *Spice_Notice != '\0')
                 fprintf(cp_out, "** %s\n", Spice_Notice);
-            if (Spice_Build_Date != NULL && *Spice_Build_Date != 0)
+            if (Spice_Build_Date != NULL && *Spice_Build_Date != '\0')
                 fprintf(cp_out, "** Creation Date: %s\n", Spice_Build_Date);
             fprintf(cp_out, "******\n");
 
@@ -212,9 +212,9 @@ com_version(wordlist *wl)
                     "** Copyright 1985-1994, Regents of the University of California.\n"
                     "** %s\n",
                     ft_sim->simulator, ft_sim->version, ft_sim->description, Spice_Manual);
-            if (Spice_Notice != NULL && *Spice_Notice != 0)
+            if (Spice_Notice != NULL && *Spice_Notice != '\0')
                 fprintf(cp_out, "** %s\n", Spice_Notice);
-            if (Spice_Build_Date != NULL && *Spice_Build_Date != 0)
+            if (Spice_Build_Date != NULL && *Spice_Build_Date != '\0')
                 fprintf(cp_out, "** Creation Date: %s\n", Spice_Build_Date);
             fprintf(cp_out, "**\n");
 #ifdef CIDER

src/frontend/newcoms.c

@@ -54,7 +54,7 @@ com_reshape(wordlist *wl)
             if (p != w->wl_word)
                 w = w->wl_next;
             wlast = w;
-            *p++ = 0;
+            *p++ = '\0';
         } else {
             wlast = NULL;
         }

src/frontend/parser/complete.c

@@ -414,7 +414,7 @@ cp_ccon(bool on)
         (void) ioctl(fileno(cp_in), TERM_GET, &OS_Buf);
 #endif
         sbuf = OS_Buf;
-        sbuf.c_cc[VEOF] = 0;
+        sbuf.c_cc[VEOF] = '\0';
         sbuf.c_cc[VEOL] = ESCAPE;
         sbuf.c_cc[VEOL2] = CNTRL_D;
 #if HAVE_TCSETATTR

src/frontend/parser/unixcom.c

@@ -96,7 +96,7 @@ cp_rehash(char *pathlist, bool docc)
 #  ifdef HAVE_GETCWD
             (void) getcwd(buf, sizeof(buf));
 #  else
-            *buf = 0;
+            *buf = '\0';
 #  endif
 #endif
             i = strlen(buf);

src/frontend/plotting/graf.c

@@ -440,7 +440,7 @@ void
 gr_pmsg(char *text)
 {
     char buf[BSIZE_SP];
-    buf[0] = 0;
+    buf[0] = '\0';
 
     DevUpdate();
 

src/frontend/plotting/x11.c

@@ -434,7 +434,7 @@ X11_NewViewport(GRAPH *graph)
     if (p != fontname) {
         for (q = fontname; *p; *q++ = *p++)
             ;
-        *q = 0;
+        *q = '\0';
     }
 
     trys = 1;
@@ -823,7 +823,7 @@ zoomin(GRAPH *graph)
 
     strncpy(buf2, graph->plotname, sizeof(buf2));
     if ((t = strchr(buf2, ':')) != NULL)
-        *t = 0;
+        *t = '\0';
 
     if (!eq(plot_cur->pl_typename, buf2)) {
         (void) sprintf(buf,

src/frontend/wdisp/windisp.c

@@ -482,7 +482,7 @@ LRESULT CALLBACK PlotWindowProc( HWND hwnd,
       
       strncpy(buf2, gr->plotname, sizeof(buf2));
       if ((t = strchr(buf2, ':')) != NULL)
-         *t = 0;
+         *t = '\0';
 
       if (!eq(plot_cur->pl_typename, buf2)) {
          (void) sprintf(buf,

src/misc/tilde.c

@@ -62,7 +62,7 @@ tildexpand(char *string)
            pw = getpwuid(getuid());
            if (pw)
              result = pw->pw_dir;
-           *buf = 0;
+           *buf = '\0';
        }
 
     } else {
@@ -70,7 +70,7 @@ tildexpand(char *string)
 	k = buf;
 	while ((c = *string) && c != '/')
 		*k++ = c, string++;
-	*k = 0;
+	*k = '\0';
 	pw = getpwnam(buf);
        if (pw)
          result = pw->pw_dir;

src/ngproc2mod.c

@@ -99,7 +99,7 @@ main(void) {
                 *typeline == '\n' ) {
             typeline ++;
         }
-        if(*typeline == 0) break;
+        if(*typeline == '\0') break;
         if(strncmp("nm",typeline,2) == 0) {
             ncur = TMALLOC(nmod, 1);
             ncur->nnext = NULL;

src/spicelib/parser/inpgmod.c

@@ -80,7 +80,7 @@ create_model( CKTcircuit* ckt, INPmodel* modtmp, INPtables* tab )
     tfree(parm);
     INPgetTok(&line, &parm, 1);        /* throw away 'modname' */
     tfree(parm);
-    while (*line != 0) {
+    while (*line != '\0') {
       INPgetTok(&line, &parm, 1);
       if (!*parm)
         continue;

src/spicelib/parser/inpgtok.c

@@ -255,7 +255,7 @@ INPgetUTok(char **line, char **token, int gobble)
         separator = '\'';
         point++;
     } else
-        separator = 0;
+        separator = '\0';
 
     /* mark beginning of token */
     *line = point;

src/spicelib/parser/inppas3.c

@@ -68,7 +68,7 @@ INPpas3(CKTcircuit *ckt, card *data, INPtables *tab, TSKtask *task,
             for(;;) {
                 /* loop until we run out of data */
                 INPgetTok(&line,&name,1);
-                if( *name == 0) break; /* end of line */
+                if( *name == '\0') break; /* end of line */
 
                 /* If we have 'all = value' , then set all voltage nodes to 'value',
                    except for ground node at node->number 0 */
@@ -113,7 +113,7 @@ INPpas3(CKTcircuit *ckt, card *data, INPtables *tab, TSKtask *task,
                 /* loop until we run out of data */
                 INPgetTok(&line,&name,1);
                 /* check to see if in the form V(xxx) and grab the xxx */
-                if( *name == 0) {
+                if( *name == '\0') {
                     FREE(name);
                     break; /* end of line */
                 }

src/xspice/cmpp/writ_ifs.c

@@ -1251,7 +1251,7 @@ static char  *boolean_to_str(Boolean_t value)
         default:
             print_error("INTERNAL ERROR - boolean_to_str() - Impossible boolean value.");
 	    {
-	       char *p = NULL; *p = 0;
+	       char *p = NULL; *p = '\0';
 	    }
     }
 

src/xspice/mif/mifgetmod.c

@@ -182,7 +182,7 @@ char *MIFgetMod(
                 INPgetTok(&line,&parm,1);     /* throw away 'modtype' */
                 tfree(parm);
 
-                while(*line != 0) {
+                while(*line != '\0') {
                     INPgetTok(&line,&parm,1);
                     for(j=0 ; j < *(ft_sim->devices[modtmp->INPmodType]->numModelParms); j++) {
                         if (strcmp(parm, ft_sim->devices[modtmp->INPmodType]->modelParms[j].keyword) == 0) {