Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/dthelp/parser.ccdf/volumegen/Pstack.c

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+/* $XConsortium: Pstack.c /main/4 1995/11/08 11:47:39 rswiston $ */
+/************************************<+>*************************************
+ ****************************************************************************
+ *
+ * File:         PStack.c
+ *
+ * Project:      Cache Creek (Rivers) Project
+ * Description:  Utility functions for volumegen program
+ * Author:       Brian Cripe
+ *               Modifications by (Mike Wilson)
+ * Language:     C
+ *
+ * (C) Copyright 1992, Hewlett-Packard, all rights reserved.
+ *
+ ****************************************************************************
+ ************************************<+>*************************************/
+
+
+#include <stdio.h>
+#include "PstackI.h"
+
+#define REALLOC_INCR  10
+
+
+
+
+
+/*****************************************************************************
+ * Function:	    PStack PStackCreate();
+ *
+ * Parameters:      NONE.
+ *
+ * Return Value:    PStack.
+ *
+ * Purpose:         Generates a PStack structure and returns it to the 
+ *                  caller.
+ *
+ *****************************************************************************/
+PStack PStackCreate()
+{
+    PStack stack;
+    stack = (PStack) malloc (sizeof (struct PStackRec));
+    stack->count = 0;
+    stack->size = REALLOC_INCR;
+    stack->items = (void **) malloc (stack->size * sizeof (void **));
+
+    return (stack);
+}
+
+
+
+/*****************************************************************************
+ * Function:	    PStack PStackDestroy();
+ *
+ * Parameters:      stack:
+ *
+ * Return Value:    void.
+ *
+ * Purpose:         Destroys a PStack structure.
+ *
+ *****************************************************************************/
+void PStackDestroy(
+     PStack stack)
+{
+    free (stack->items);
+    free (stack);
+}
+
+
+
+
+
+/*****************************************************************************
+ * Function:	    PStack PStackPush();
+ *
+ * Parameters:      stack:
+ *                  ptr:
+ *
+ * Return Value:    void
+ *
+ * Purpose:         Pushes a PStack structure on the current stack.
+ *
+ *****************************************************************************/
+void PStackPush(
+     PStack stack,
+     void *ptr)
+{
+    if (stack->count == stack->size) {
+	stack->size += REALLOC_INCR;
+	stack->items = (void **) realloc (stack->items, 
+					  stack->size * sizeof (void **));
+    }
+
+    *(stack->items + stack->count) = ptr;
+    stack->count++;
+}
+
+
+
+/*****************************************************************************
+ * Function:	    PStack *PStackPeek();
+ *
+ * Parameters:      stack:
+ *
+ * Return Value:    void.
+ *
+ * Purpose:         Gets a PStack.
+ *
+ *****************************************************************************/
+void *PStackPeek(
+     PStack stack)
+
+{
+    if (stack->count == 0)
+	return (NULL);
+
+    else
+	return (*(stack->items + stack->count - 1));
+}
+
+
+/*****************************************************************************
+ * Function:	    PStack *PStackPop();
+ *
+ * Parameters:      stack:
+ *
+ * Return Value:    void.
+ *
+ * Purpose:         Pops the top element off the stack
+ *
+ *****************************************************************************/
+void *PStackPop(
+     PStack stack)
+{
+    if (stack->count == 0)
+	return (NULL);
+
+    else {
+	stack->count--;
+	return (*(stack->items + stack->count));
+    }
+}
+
+	    
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