gm_gm_16F1: decompile fn_8016F870

100% instruction byte match (78/78). Data relocation symbol
differs (lbl_803D5648 vs ...data.0) due to split-tool vs
MWCC anchor naming - both resolve to same address.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: johnwinston

src/melee/gm/gm_16F1.c

@@ -152,7 +152,60 @@ void fn_8016F344(struct lbl_8046B6A0_24C_t* arg0)
 
 /// #fn_8016F740
 
-/// #fn_8016F870
+int fn_8016F870(void* arg0, u16 arg1, u8 mask, u8 player_id)
+{
+    struct lbl_803D5A4C_t* curr;
+    int kind;
+    u8 flags;
+    int i;
+
+    if (arg1 > 0x101 || arg1 == 0) {
+        return -1;
+    }
+
+    for (i = arg1 - 1; i >= 0; i--) {
+        kind = lbl_803D5A4C[i].kind;
+
+        if (kind < 0xD7) {
+            curr = lbl_803D5A4C;
+            while (curr->kind != i) {
+                if (curr->kind == 0x29A) {
+                    flags = 0;
+                    goto check1;
+                }
+                curr++;
+            }
+            flags = curr->x4;
+
+        check1:
+            if ((u8) mask & flags) {
+                if (pl_80039418(player_id, i) != 0) {
+                    return i;
+                }
+            }
+        } else {
+            curr = lbl_803D5A4C;
+            while (curr->kind != i) {
+                if (curr->kind == 0x29A) {
+                    flags = 0;
+                    goto check2;
+                }
+                curr++;
+            }
+            flags = curr->x4;
+
+        check2:
+            if ((u8) mask & flags) {
+                if ((unsigned) fn_801701C0(arg0, player_id, i) != 0) {
+                    return i;
+                }
+            }
+        }
+    }
+
+    return -1;
+    PAD_STACK(8);
+}
 
 /// #fn_8016F9A8
 

src/melee/gm/gm_16F1.h

@@ -24,7 +24,7 @@ struct lbl_804D65A8_t;
 /* 16F39C */ UNK_RET fn_8016F39C(UNK_PARAMS);
 /* 16F548 */ UNK_RET fn_8016F548(UNK_PARAMS);
 /* 16F740 */ UNK_RET fn_8016F740(UNK_PARAMS);
-/* 16F870 */ UNK_RET fn_8016F870(UNK_PARAMS);
+/* 16F870 */ int fn_8016F870(void*, u16, u8, u8);
 /* 16F9A8 */ UNK_RET fn_8016F9A8(UNK_PARAMS);
 /* 16FAD4 */ int fn_8016FAD4(UNK_T, u16, int, u8);
 /* 16FFD4 */ void fn_8016FFD4(struct lbl_8046B6A0_24C_t*, int, int);