Move light source and timer types so zero means none

Breaks saves and bones.

include/patchlevel.h

@@ -17,7 +17,7 @@
  * Incrementing EDITLEVEL can be used to force invalidation of old bones
  * and save files.
  */
-#define EDITLEVEL 102
+#define EDITLEVEL 103
 
 /*
  * Development status possibilities.

include/timeout.h

@@ -10,11 +10,12 @@ typedef void (*timeout_proc)(ANY_P *, long);
 
 /* kind of timer */
 enum timer_type {
-    TIMER_LEVEL = 0,   /* event specific to level [melting ice] */
-    TIMER_GLOBAL = 1,  /* event follows current play [not used] */
-    TIMER_OBJECT = 2,  /* event follows an object [various] */
-    TIMER_MONSTER = 3, /* event follows a monster [not used] */
-    NUM_TIMER_KINDS    /* 4 */
+    TIMER_NONE = 0,
+    TIMER_LEVEL = 1,   /* event specific to level [melting ice] */
+    TIMER_GLOBAL = 2,  /* event follows current play [not used] */
+    TIMER_OBJECT = 3,  /* event follows an object [various] */
+    TIMER_MONSTER = 4, /* event follows a monster [not used] */
+    NUM_TIMER_KINDS    /* 5 */
 };
 
 /* save/restore timer ranges */

include/vision.h

@@ -12,8 +12,12 @@
 /*
  * Light source sources
  */
-#define LS_OBJECT 0
-#define LS_MONSTER 1
+enum ls_sources {
+    LS_NONE = 0,
+    LS_OBJECT = 1,
+    LS_MONSTER = 2,
+    NUM_LS_SOURCES
+};
 
 /*
  *  cansee()    - Returns true if the hero can see the location.

src/light.c

@@ -103,6 +103,10 @@ del_light_source(int type, anything *id)
        has only been partially restored during a level change
        (in particular: chameleon vs prot. from shape changers) */
     switch (type) {
+    case LS_NONE:
+        impossible("del_light_source:type=none");
+        tmp_id.a_uint = 0;
+        break;
     case LS_OBJECT:
         tmp_id.a_uint = id->a_obj ? id->a_obj->o_id : 0;
         break;

src/timeout.c

@@ -1942,6 +1942,9 @@ staticfn const char *
 kind_name(short kind)
 {
     switch (kind) {
+    case TIMER_NONE:
+        impossible("no timer type");
+        return "none";
     case TIMER_LEVEL:
         return "level";
     case TIMER_GLOBAL:
@@ -2179,7 +2182,7 @@ start_timer(
 {
     timer_element *gnu, *dup;
 
-    if (kind < 0 || kind >= NUM_TIMER_KINDS
+    if (kind <= TIMER_NONE || kind >= NUM_TIMER_KINDS
         || func_index < 0 || func_index >= NUM_TIME_FUNCS)
         panic("start_timer (%s: %d)", kind_name(kind), (int) func_index);