return legal indexes for some display.h macros

Some static analyzers flagged the last-resort values as
out of bounds (which they were).

There's a small number of other complaint-suppression items in here too,
but nothing drastic.

include/display.h

@@ -710,6 +710,7 @@ enum glyph_offsets {
     ((glyph) >= GLYPH_CMAP_STONE_OFF \
      && (glyph) < (GLYPH_CMAP_C_OFF + ((S_goodpos - S_digbeam) + 1)))
 
+/* final MAXPCHARS is legal array index because of trailing fencepost entry */
 #define glyph_to_cmap(glyph) \
     (((glyph) == GLYPH_CMAP_STONE_OFF)                                  \
       ? S_stone                                                         \
@@ -733,7 +734,7 @@ enum glyph_offsets {
                         ? (((glyph) - GLYPH_CMAP_C_OFF) + S_digbeam)    \
                         : glyph_is_cmap_zap(glyph)                      \
                           ? ((((glyph) - GLYPH_ZAP_OFF) % 4) + S_vbeam) \
-                          : NO_GLYPH)
+                          : MAXPCHARS)
 
 #define glyph_to_swallow(glyph) \
     (glyph_is_swallow(glyph) ? (((glyph) - GLYPH_SWALLOW_OFF) & 0x7) : 0)
@@ -779,6 +780,7 @@ enum glyph_offsets {
      || glyph_is_ridden_monster(glyph) || glyph_is_detected_monster(glyph))
 #define glyph_is_invisible(glyph) ((glyph) == GLYPH_INVISIBLE)
 
+/* final NUMMONS is legal array index because of trailing fencepost entry */
 #define glyph_to_mon(glyph) \
        (glyph_is_normal_female_monster(glyph)                  \
          ? ((glyph) - GLYPH_MON_FEM_OFF)                       \
@@ -796,7 +798,7 @@ enum glyph_offsets {
                      ? ((glyph) - GLYPH_RIDDEN_FEM_OFF)        \
                      : glyph_is_ridden_male_monster(glyph)     \
                        ? ((glyph) - GLYPH_RIDDEN_MALE_OFF)     \
-                       : NO_GLYPH)
+                       : NUMMONS)
 
 #define obj_is_piletop(obj) \
     ((obj)->where == OBJ_FLOOR                                  \
@@ -876,6 +878,7 @@ enum glyph_offsets {
                 ? (GLYPH_BODY_OFF)))                            \
          : ((int) (obj)->otyp + GLYPH_OBJ_OFF))))
 
+/* final NUM_OBJECTS is legal array idx because of trailing fencepost entry */
 #define glyph_to_obj(glyph) \
     (glyph_is_body(glyph) ? CORPSE                              \
      : glyph_is_statue(glyph) ? STATUE                          \
@@ -883,7 +886,7 @@ enum glyph_offsets {
            ? ((glyph) - (glyph_is_normal_piletop_obj(glyph)     \
                            ? GLYPH_OBJ_PILETOP_OFF              \
                            : GLYPH_OBJ_OFF))                    \
-           : NO_GLYPH)
+           : NUM_OBJECTS)
 
 #define glyph_to_body_corpsenm(glyph) \
     (glyph_is_body_piletop(glyph)                       \

include/sym.h

@@ -160,7 +160,7 @@ struct symset_customization {
 };
 #endif /* ENHANCED_SYMBOLS */
 
-extern const struct symdef defsyms[MAXPCHARS]; /* defaults */
+extern const struct symdef defsyms[MAXPCHARS + 1]; /* defaults */
 #define WARNCOUNT 6 /* number of different warning levels */
 extern const struct symdef def_warnsyms[WARNCOUNT];
 #define SYMHANDLING(ht) (g.symset[g.currentgraphics].handling == (ht))

src/apply.c

@@ -3161,13 +3161,12 @@ static boolean
 find_poleable_mon(coord *pos, int min_range, int max_range)
 {
     struct monst *mtmp;
-    coord mpos;
+    coord mpos = { 0, 0 }; /* no candidate location yet */
     boolean impaired;
     coordxy x, y, lo_x, hi_x, lo_y, hi_y, rt;
     int glyph;
 
     impaired = (Confusion || Stunned || Hallucination);
-    mpos.x = mpos.y = 0; /* no candidate location yet */
     rt = isqrt(max_range);
     lo_x = max(u.ux - rt, 1), hi_x = min(u.ux + rt, COLNO - 1);
     lo_y = max(u.uy - rt, 0), hi_y = min(u.uy + rt, ROWNO - 1);

src/display.c

@@ -1075,9 +1075,9 @@ tmp_at(coordxy x, coordxy y)
         break;
     }
 
-    if (!tglyph)
+    if (!tglyph) {
         panic("tmp_at: tglyph not initialized");
-
+    } else {
         switch (x) {
         case DISP_CHANGE:
             tglyph->glyph = y;
@@ -1144,7 +1144,8 @@ tmp_at(coordxy x, coordxy y)
                 tglyph->saved[tglyph->sidx].y = y;
                 tglyph->sidx += 1;
             } else { /* DISP_FLASH/ALWAYS */
-            if (tglyph->sidx) { /* not first call, so reset previous pos */
+                if (tglyph
+                        ->sidx) { /* not first call, so reset previous pos */
                     newsym(tglyph->saved[0].x, tglyph->saved[0].y);
                     tglyph->sidx = 0; /* display is presently up to date */
                 }
@@ -1158,7 +1159,8 @@ tmp_at(coordxy x, coordxy y)
             show_glyph(x, y, tglyph->glyph); /* show it */
             flush_screen(0);                 /* make sure it shows up */
             break;
-    } /* end case */
+        } /* end switch */
+    }
 }
 
 /*

src/drawing.c

@@ -66,10 +66,15 @@ const struct symdef def_warnsyms[WARNCOUNT] = {
  *  parsing other.txt because some of the useful tile names don't exist
  *  within NetHack itself.
  */
-const struct symdef defsyms[MAXPCHARS] = {
+const struct symdef defsyms[MAXPCHARS + 1] = {
 #define PCHAR_DRAWING
 #include "defsym.h"
 #undef PCHAR_DRAWING
+    { 0, NULL
+#ifdef TEXTCOLOR
+              , NO_COLOR
+#endif
+    }
 };
 
 /* default rogue level symbols */
@@ -130,7 +135,7 @@ def_char_is_furniture(char ch)
     int i;
     boolean furniture = FALSE;
 
-    for (i = 0; i < SIZE(defsyms); ++i) {
+    for (i = 0; i < MAXPCHARS; ++i) {
         if (!furniture) {
             if (!strncmp(defsyms[i].explanation, first_furniture, 5))
                 furniture = TRUE;

win/share/tilemap.c

@@ -62,7 +62,7 @@ struct {
     int idx;
     const char *tilelabel;
     const char *expectedlabel;
-} altlabels[MAXPCHARS] = {
+} altlabels[MAXPCHARS + 1] = {
 #define PCHAR_TILES
 #include "defsym.h"
 #undef PCHAR_TILES