From fdbcdb5b7d491d054b1ed0105c09f5192355c38c Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Thu, 23 Apr 2020 14:16:49 +0200
Subject: [PATCH] apply const qualifier appropriately

---
 src/frontend/arg.c           | 4 +++-
 src/frontend/arg.h           | 2 +-
 src/include/ngspice/cpdefs.h | 2 +-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/frontend/arg.c b/src/frontend/arg.c
index 6a09b1c86..268c62adc 100644
--- a/src/frontend/arg.c
+++ b/src/frontend/arg.c
@@ -78,10 +78,12 @@ arg_plot(const wordlist *wl, const struct comm *command)
 
 
 void
-arg_load(wordlist *wl, const struct comm *command)
+arg_load(const wordlist *wl_in, const struct comm *command)
 {
     /* just call com_load */
+    wordlist* const wl = wl_copy(wl_in);
     command->co_func(wl);
+    wl_free(wl);
 }
 
 
diff --git a/src/frontend/arg.h b/src/frontend/arg.h
index de9ec6f09..7c049b45d 100644
--- a/src/frontend/arg.h
+++ b/src/frontend/arg.h
@@ -10,7 +10,7 @@ char *prompt(FILE *fp);
 wordlist *process(wordlist *wlist);
 void arg_print(const wordlist *wl, const struct comm *command);
 void arg_plot(const wordlist *wl, const struct comm *command);
-void arg_load(wordlist *wl, const struct comm *command);
+void arg_load(const wordlist *wl, const struct comm *command);
 void arg_let(const wordlist *wl, const struct comm *command);
 void arg_set(const wordlist *wl, const struct comm *command);
 void arg_display(const wordlist *wl, const struct comm *command);
diff --git a/src/include/ngspice/cpdefs.h b/src/include/ngspice/cpdefs.h
index 8fc78dfd8..a29190288 100644
--- a/src/include/ngspice/cpdefs.h
+++ b/src/include/ngspice/cpdefs.h
@@ -41,7 +41,7 @@ struct comm {
     int co_maxargs;
 
     /* The fn that prompts the user. */
-    void (*co_argfn) (wordlist *wl, struct comm *command);
+    void (*co_argfn) (const wordlist *wl, const struct comm *command);
 
     /* When these are printed, printf(string, av[0]) .. */
     char *co_help;