inpcom.c, find_assignment(), const'ify and declare extern

src/frontend/inpcom.c

@@ -409,10 +409,10 @@ inp_stitch_continuation_lines(struct line *working)
  *   take care of `!=' `<=' `==' and `>='
  */
 
-static char *
-find_assignment(char *str)
+char *
+find_assignment(const char *str)
 {
-    char *p = str;
+    const char *p = str;
 
     while ((p = strchr(p, '=')) != NULL) {
 
@@ -429,7 +429,7 @@ find_assignment(char *str)
                 continue;
             }
 
-        return p;
+        return (char *) p;
     }
 
     return NULL;

src/include/ngspice/fteext.h

@@ -215,6 +215,7 @@ extern void inp_list(FILE *file, struct line *deck, struct line *extras, int typ
 extern struct line *inp_readall(FILE *fp, char *dir_name, bool comfile, bool intfile, bool *expr_w_temper);
 extern FILE *inp_pathopen(char *name, char *mode);
 extern char *search_identifier(char *str, const char *identifier, char *str_begin);
+extern char *find_assignment(const char *s);
 extern struct line *line_nconc(struct line *head, struct line *rest);
 extern struct line *line_reverse(struct line *head);