SuperTuxKart 1.5 upstream source (from official release tarball)

2026-06-11 20:04:02 +02:00
commit 2957e51aaa
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+/*
+ * Copyright (C) 2018-2019 Muhammad Tayyab Akram
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <SBConfig.h>
+
+#include "SBAssert.h"
+#include "SBBase.h"
+#include "ScriptStack.h"
+
+SB_INTERNAL void ScriptStackReset(ScriptStackRef stack)
+{
+    stack->top = -1;
+    stack->count = 0;
+    stack->open = 0;
+}
+
+SB_INTERNAL void ScriptStackPush(ScriptStackRef stack, SBScript script, SBCodepoint mirror)
+{
+    stack->count = SBNumberLimitIncrement(stack->count, _SBScriptStackCapacity);
+    stack->open = SBNumberLimitIncrement(stack->open, _SBScriptStackCapacity);
+
+    stack->top = SBNumberRingIncrement(stack->top, _SBScriptStackCapacity);
+    stack->_elements[stack->top].script = script;
+    stack->_elements[stack->top].mirror = mirror;
+}
+
+SB_INTERNAL void ScriptStackPop(ScriptStackRef stack)
+{
+    /* There must be at least one entry in the stack. */
+    SBAssert(stack->count > 0);
+
+    stack->count -= 1;
+    stack->open = SBNumberLimitDecrement(stack->open, 0);
+    stack->top = SBNumberRingDecrement(stack->top, _SBScriptStackCapacity);
+
+    if (ScriptStackIsEmpty(stack)) {
+        stack->top = -1;
+    }
+}
+
+SB_INTERNAL void ScriptStackLeavePairs(ScriptStackRef stack)
+{
+    stack->open = 0;
+}
+
+SB_INTERNAL void ScriptStackSealPairs(ScriptStackRef stack, SBScript script)
+{
+    SBInteger index = SBNumberRingSubtract(stack->top, (SBInteger)stack->open, _SBScriptStackCapacity);
+
+    while (stack->open) {
+        index = SBNumberRingIncrement(index, _SBScriptStackCapacity);
+        stack->_elements[index].script = script;
+        stack->open -= 1;
+    }
+}
+
+SB_INTERNAL SBBoolean ScriptStackIsEmpty(ScriptStackRef stack)
+{
+    return (stack->count == 0);
+}
+
+SB_INTERNAL SBScript ScriptStackGetScript(ScriptStackRef stack)
+{
+    return stack->_elements[stack->top].script;
+}
+
+SB_INTERNAL SBCodepoint ScriptStackGetMirror(ScriptStackRef stack)
+{
+    return stack->_elements[stack->top].mirror;
+}