From 30daa16255114a3d37c2197288a7194b360625d8 Mon Sep 17 00:00:00 2001
From: rozlette <uberpanzermensch@gmail.com>
Date: Sun, 12 Jan 2020 20:18:31 -0600
Subject: Port stackcheck.c from oot decomp

---
 src/boot_O2/stackcheck.c | 121 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 src/boot_O2/stackcheck.c

(limited to 'src/boot_O2/stackcheck.c')

diff --git a/src/boot_O2/stackcheck.c b/src/boot_O2/stackcheck.c
new file mode 100644
index 000000000..b2e28a34d
--- /dev/null
+++ b/src/boot_O2/stackcheck.c
@@ -0,0 +1,121 @@
+#include <ultra64.h>
+#include <global.h>
+
+void StackCheck_Init(StackEntry* entry, u32 stackTop, u32 stackBottom, u32 initValue, s32 minSpace, char* name) {
+    StackEntry* iter;
+    u32* addr;
+
+    if (!entry) {
+        sStackInfoListStart = NULL;
+    } else {
+        entry->head = stackTop;
+        entry->tail = stackBottom;
+        entry->initValue = initValue;
+        entry->minSpace = minSpace;
+        entry->name = name;
+        iter = sStackInfoListStart;
+        while (iter) {
+            if (iter == entry) {
+                return;
+            }
+            iter = iter->next;
+        }
+
+        entry->prev = sStackInfoListEnd;
+        entry->next = NULL;
+
+        if (sStackInfoListEnd) {
+            sStackInfoListEnd->next = entry;
+        }
+
+        sStackInfoListEnd = entry;
+        if (!sStackInfoListStart) {
+            sStackInfoListStart = entry;
+        }
+
+        if (entry->minSpace != -1) {
+            addr = (u32*)entry->head;
+            while ((u32)addr < entry->tail) {
+                *addr++ = entry->initValue;
+            }
+        }
+    }
+}
+
+void StackCheck_Cleanup(StackEntry* entry) {
+    u32 inconsistency = 0; // unused variable needed to match
+
+    if (!entry->prev) {
+        if (entry == sStackInfoListStart) {
+            sStackInfoListStart = entry->next;
+        } else {
+            inconsistency = 1;
+        }
+    } else {
+        entry->prev->next = entry->next;
+    }
+
+    if (!entry->next) {
+        if (entry == sStackInfoListEnd) {
+            sStackInfoListEnd = entry->prev;
+        } else {
+            inconsistency = 1;
+        }
+    }
+
+    if (inconsistency) {}
+}
+
+#ifdef NON_MATCHING
+// Missing useless move
+s32 StackCheck_GetState(StackEntry* entry) {
+    u32* last;
+    u32 used;
+    u32 free;
+    s32 ret;
+
+    for (last = (u32*)entry->head; (u32)last < entry->tail; last++) {
+        if (entry->initValue != *last) {
+            break;
+        }
+    }
+
+    used = entry->tail - (u32)last;
+    free = (u32)last - entry->head;
+
+    if (free == 0) {
+        return 2;
+    }
+
+    if (free < entry->minSpace && entry->minSpace != -1) {
+        return 1;
+    }
+
+    return 0;
+}
+#else
+GLOBAL_ASM("asm/nonmatching/stackcheck/StackCheck_GetState.asm")
+#endif
+
+u32 StackCheck_CheckAll() {
+    u32 ret = 0;
+
+    StackEntry* iter = sStackInfoListStart;
+    while(iter) {
+        u32 state = StackCheck_GetState(iter);
+        if (state) {
+            ret = 1;
+        }
+        iter = iter->next;
+    }
+
+    return ret;
+}
+
+u32 StackCheck_Check(StackEntry* entry) {
+    if (!entry) {
+        return StackCheck_CheckAll();
+    } else {
+        return StackCheck_GetState(entry);
+    }
+}
-- 
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