Complain to user on save/resume.restore when it's disabled.

adventure.yaml

@@ -3173,6 +3173,7 @@ arbitrary_messages:  !!omap
     To achieve the next higher rating would be a neat trick!
     Congratulations!!
 - OFF_SCALE: 'You just went off my scale!!'
+- SAVERESUME_DISABLED: 'Save abd resume are disabled.'
 - RESUME_HELP: 'To resume your Adventure, start a new game and then say "RESUME".'
 # This message is not currently used
 #- TABLE_SPACE: |-

notes.adoc

@@ -126,6 +126,10 @@ tamper-proofing saves when everyone has the source code.
 A -r command-line option has been added. When it is given (with a file
 path argument) it is functionally equivalent to a RESTORE command.
 
+The game can be built in a mode that entirely disables save/resume, or
+thart autosaves only on a termination signal (for use in BBS doort
+systems).  There is a new nmessage to inform the user about this.
+
 == Translation ==
 
 The 2.5 code was a mechanical C translation of a FORTRAN original.

saveresume.c

@@ -60,10 +60,11 @@ int suspend(void)
     /*  Suspend.  Offer to save things in a file, but charging
      *  some points (so can't win by using saved games to retry
      *  battles or to start over after learning zzword).
-     *  If ADVENT_NOSAVE is defined, do nothing instead. */
+     *  If ADVENT_NOSAVE is defined, gripe instead. */
 
 #if defined ADVENT_NOSAVE || defined ADVENT_AUTOSAVE
-    return GO_UNKNOWN;
+    rspeak(SAVERESUME_DISABLED)
+    return GO_TOP;
 #endif
     FILE *fp = NULL;
 
@@ -91,10 +92,11 @@ int suspend(void)
 int resume(void)
 {
     /*  Resume.  Read a suspended game back from a file.
-     *  If ADVENT_NOSAVE is defined, do nothing instead. */
+     *  If ADVENT_NOSAVE is defined, gripe instead. */
 
 #if defined ADVENT_NOSAVE || defined ADVENT_AUTOSAVE
-    return GO_UNKNOWN;
+    rspeak(SAVERESUME_DISABLED)
+    return GO_TOP;
 #endif
     FILE *fp = NULL;
 
@@ -125,9 +127,10 @@ int restore(FILE* fp)
 {
     /*  Read and restore game state from file, assuming
      *  sane initial state.
-     *  If ADVENT_NOSAVE is defined, do nothing instead. */
+     *  If ADVENT_NOSAVE is defined, gripe instead. */
 #ifdef ADVENT_NOSAVE
-    return GO_UNKNOWN;
+    rspeak(SAVERESUME_DISABLED)
+    return GO_TOP;
 #endif
 
     IGNORE(fread(&save, sizeof(struct save_t), 1, fp));