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Add IntPtrStack

This commit is contained in:
Lauri Kasanen 2017-05-01 20:46:06 +03:00
parent a84463a3df
commit 679bfb0ae9
2 changed files with 211 additions and 0 deletions
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90
src/common/intptrstack.c Normal file
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/*****************************************************************************/
/* */
/* intptrstack.c */
/* */
/* Integer+ptr stack used for program settings */
/* */
/* */
/* */
/* (C) 2017, Mega Cat Studios */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
/* common */
#include "check.h"
#include "intptrstack.h"
/*****************************************************************************/
/* Code */
/*****************************************************************************/
void IPS_Get (const IntPtrStack* S, long *Val, void **Ptr)
/* Get the value on top of an int stack */
{
PRECONDITION (S->Count > 0);
if (Val) *Val = S->Stack[S->Count-1].val;
if (Ptr) *Ptr = S->Stack[S->Count-1].ptr;
}
void IPS_Set (IntPtrStack* S, long Val, void *Ptr)
/* Set the value on top of an int stack */
{
PRECONDITION (S->Count > 0);
S->Stack[S->Count-1].val = Val;
S->Stack[S->Count-1].ptr = Ptr;
}
void IPS_Drop (IntPtrStack* S)
/* Drop a value from an int stack */
{
PRECONDITION (S->Count > 0);
--S->Count;
}
void IPS_Push (IntPtrStack* S, long Val, void *Ptr)
/* Push a value onto an int stack */
{
PRECONDITION (S->Count < sizeof (S->Stack) / sizeof (S->Stack[0]));
S->Stack[S->Count].val = Val;
S->Stack[S->Count++].ptr = Ptr;
}
void IPS_Pop (IntPtrStack* S, long *Val, void **Ptr)
/* Pop a value from an int stack */
{
PRECONDITION (S->Count > 0);
if (Val) *Val = S->Stack[--S->Count].val;
if (Ptr) *Ptr = S->Stack[S->Count].ptr;
}

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src/common/intptrstack.h Normal file
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/*****************************************************************************/
/* */
/* intptrstack.h */
/* */
/* Integer+ptr stack used for program settings */
/* */
/* */
/* */
/* (C) 2017, Mega Cat Studios */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#ifndef INTPTRSTACK_H
#define INTPTRSTACK_H
#include "inline.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
typedef struct IntPtrStack IntPtrStack;
struct IntPtrInner {
long val;
void *ptr;
};
struct IntPtrStack {
unsigned Count;
struct IntPtrInner Stack[8];
};
/* An initializer for an empty int stack */
#define STATIC_INTPTRSTACK_INITIALIZER { 0, { 0, 0 }, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0} } }
/* Declare an int stack with the given value as first element */
#define INTPTRSTACK(Val, Ptr) { 1, { {Val, Ptr}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0} } }
/*****************************************************************************/
/* Code */
/*****************************************************************************/
#if defined(HAVE_INLINE)
INLINE int IPS_IsFull (const IntPtrStack* S)
/* Return true if there is no space left on the given int stack */
{
return (S->Count >= sizeof (S->Stack) / sizeof (S->Stack[0]));
}
#else
# define IPS_IsFull(S) ((S)->Count >= sizeof ((S)->Stack) / sizeof ((S)->Stack[0]))
#endif
#if defined(HAVE_INLINE)
INLINE int IPS_IsEmpty (const IntPtrStack* S)
/* Return true if there are no values on the given int stack */
{
return (S->Count == 0);
}
#else
# define IPS_IsEmpty(S) ((S)->Count == 0)
#endif
#if defined(HAVE_INLINE)
INLINE unsigned IPS_GetCount (const IntPtrStack* S)
/* Return the number of elements on the given int stack */
{
return S->Count;
}
#else
# define IPS_GetCount(S) (S)->Count
#endif
void IPS_Get (const IntPtrStack* S, long *Val, void **Ptr);
/* Get the value on top of an int stack */
void IPS_Set (IntPtrStack* S, long Val, void *Ptr);
/* Set the value on top of an int stack */
void IPS_Drop (IntPtrStack* S);
/* Drop a value from an int stack */
void IPS_Push (IntPtrStack* S, long Val, void *Ptr);
/* Push a value onto an int stack */
void IPS_Pop (IntPtrStack* S, long *Val, void **Ptr);
/* Pop a value from an int stack */
/* End of IntPtrStack.h */
#endif