id24: implement DEHACKED "Carousel icon" weapon block field (#2144)

src/d_deh.c

@@ -1503,6 +1503,8 @@ char *deh_weapon[] =
   // mbf21
   "Ammo per shot",  // .ammopershot
   "MBF21 Bits",     // .flags
+  // id24
+  "Carousel icon",  // .carouselicon
 };
 
 // CHEATS - Dehacked block name = "Cheat"
@@ -2566,7 +2568,20 @@ void deh_procWeapon(DEHFILE *fpin, FILE* fpout, char *line)
 
                       weaponinfo[indexnum].flags = value;
                     }
-                    else
+                   else
+                     if (!strcasecmp(key, deh_weapon[8])) // Carousel icon
+                       {
+                          char candidate[9] = {0};
+                          M_CopyLumpName(candidate, ptr_lstrip(strval));
+                          int len = strlen(candidate);
+                          if (len < 1 || len > 7)
+                            {
+                              if (fpout) fprintf(fpout,"Bad length for carousel icon name '%s'\n",candidate);
+                              continue;
+                            }
+                          weaponinfo[indexnum].carouselicon = M_StringDuplicate(candidate);
+                       }
+                     else
                       if (fpout) fprintf(fpout,"Invalid weapon string index for '%s'\n",key);
     }
   return;
@@ -3397,7 +3412,7 @@ void rstrip(char *s)  // strip trailing whitespace
 //
 char *ptr_lstrip(char *p)  // point past leading whitespace
 {
-  while (*p >= 0 && isspace(*p))
+  while (*p && isspace(*p))
     p++;
   return p;
 }

src/d_items.h

@@ -59,6 +59,7 @@ typedef struct
   int         flags;
   // id24
   int         slot;
+  const char  *carouselicon;
 } weaponinfo_t;
 
 extern  weaponinfo_t    weaponinfo[NUMWEAPONS+2];

src/st_carousel.c

@@ -13,6 +13,7 @@
 
 #include <math.h>
 
+#include "d_items.h"
 #include "d_player.h"
 #include "doomdef.h"
 #include "doomtype.h"
@@ -164,8 +165,17 @@ void ST_UpdateCarousel(player_t *player)
 static void DrawIcon(int x, int y, sbarelem_t *elem, weapon_icon_t icon)
 {
     char lump[9] = {0};
-    M_snprintf(lump, sizeof(lump), "%s%d", names[icon.weapon],
-        icon.state == wpi_selected);
+    const char *name;
+    if (weaponinfo[icon.weapon].carouselicon)
+    {
+        name = weaponinfo[icon.weapon].carouselicon;
+    }
+    else
+    {
+        name = names[icon.weapon];
+    }
+
+    M_snprintf(lump, sizeof(lump), "%s%d", name, icon.state == wpi_selected);
 
     patch_t *patch = V_CachePatchName(lump, PU_CACHE);