[Change] You can no longer buy a star map if you already know the area.

src/land.c

@@ -15,6 +15,7 @@
 #include "ltime.h"
 #include "save.h"
 #include "music.h"
+#include "map.h"
 #include "land.h"
 
 /* Global/main window. */
@@ -393,6 +394,11 @@ static int outfit_canBuy(Outfit* outfit, int q, int errmsg) {
     }
     return 0;
   }
+  else if(outfit_isMap(outfit) && map_isMapped(NULL, outfit->u.map.radius)) {
+    if(errmsg != 0)
+      dialogue_alert("You already own this map.");
+    return 0;
+  }
 
   return 1;
 }

src/map.c

@@ -790,3 +790,48 @@ int map_map(char* targ_sys, int r) {
   return 0;
 }
 
+/* Check to see if radius is mapped. */
+int map_isMapped(char* targ_sys, int r) {
+  int i, dep, ret;
+  StarSystem* sys, *jsys;
+  SysNode* closed, *open, *cur, *neighbour;
+
+  A_gc = NULL;
+  open = closed = NULL;
+
+  if(targ_sys == NULL) sys = cur_system;
+  else sys = system_get(targ_sys);
+  open = A_newNode(sys, NULL);
+  open->r = 0;
+  ret = 1;
+
+  while((cur = A_lowest(open)) != NULL) {
+    /* Mark system as known and go to next. */
+    sys = cur->sys;
+    dep = cur->r;
+    if(!sys_isFlag(sys, SYSTEM_KNOWN)) {
+      ret = 0;
+      break;
+    }
+    open = A_rm(open, sys);
+    closed = A_add(closed, cur);
+
+    /* Check it's jumps. */
+    for(i = 0; i < sys->njumps; i++) {
+      jsys = &systems_stack[cur->sys->jumps[i]];
+
+      /* System has already been parsed or is too deep. */
+      if((A_in(closed, jsys) != NULL) || (dep+1 > r))
+        continue;
+
+      /* Create new node and such. */
+      neighbour = A_newNode(jsys, NULL);
+      neighbour->r = dep+1;
+      open = A_add(open, neighbour);
+    }
+  }
+
+  A_freeList(A_gc);
+  return ret;
+}
+

src/map.h

@@ -11,4 +11,5 @@ void map_jump(void);
 /* Manipulate universe stuff. */
 StarSystem** map_getJumpPath(int* njumps, char* sysstart, char* sysend, int ignore_known);
 int map_map(char* targ_sys, int r);
+int map_isMapped(char* targ_sys, int r);