pointer_api.h

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/*
    MIT License
 
    Copyright (c) 2025 Robin A. Onsay
 
    Permission is hereby granted, free of charge, to any person obtaining
    a copy of this software and associated documentation files
    (the "Software"), to deal in the Software without restriction,
    including without limitation the rights to use, copy, modify, merge,
    publish, distribute, sublicense, and/or sell copies of the Software,
    and to permit persons to whom the Software is furnished to do so,
    subject to the following conditions:
 
    The above copyright notice and this permission notice shall be
    included in all copies or substantial portions of the Software.
*/
 
#ifndef JUNO_POINTER_API_H
#define JUNO_POINTER_API_H
#include "juno/macros.h"
#include "juno/status.h"
#include "juno/module.h"
#include <stddef.h>
#include <stdalign.h>
#include <stdint.h> // for uintptr_t used in type/alignment verification macros
#include "juno/types.h"
#ifdef __cplusplus
extern "C"
{
#endif
 
typedef struct JUNO_POINTER_TAG JUNO_POINTER_T;
typedef struct JUNO_POINTER_API_TAG JUNO_POINTER_API_T;
typedef struct JUNO_VALUE_POINTER_API_TAG JUNO_VALUE_POINTER_API_T;
 
 
struct JUNO_POINTER_TAG JUNO_TRAIT_ROOT(JUNO_POINTER_API_T,
    void *pvAddr;
    size_t zSize;
    size_t zAlignment;
);
 
struct JUNO_POINTER_API_TAG
{
    JUNO_STATUS_T (*Copy)(JUNO_POINTER_T tDest, const JUNO_POINTER_T tSrc);
    JUNO_STATUS_T (*Reset)(JUNO_POINTER_T tPointer);
};
 
 
struct JUNO_VALUE_POINTER_API_TAG
{
    JUNO_RESULT_BOOL_T (*Equals)(const JUNO_POINTER_T tLeft, const JUNO_POINTER_T tRight);
};
 
JUNO_MODULE_RESULT(JUNO_RESULT_POINTER_T, JUNO_POINTER_T);
JUNO_MODULE_OPTION(JUNO_OPTION_POINTER_T, JUNO_POINTER_T);
 
#define JunoMemory_PointerInit(ptApi, TYPE_T, pvAddr) (JUNO_POINTER_T){ptApi, pvAddr, sizeof(TYPE_T), alignof(TYPE_T)}
#define JunoMemory_PointerVerifyType(pointer, type, tApi) \
(( \
    JunoMemory_PointerVerify(pointer) == JUNO_STATUS_SUCCESS && \
    pointer.ptApi == &tApi && \
    pointer.zSize == sizeof(type) && \
    pointer.zAlignment == alignof(type) && \
    (uintptr_t) pointer.pvAddr % pointer.zAlignment == 0 \
)?JUNO_STATUS_SUCCESS:JUNO_STATUS_ERR)
 
#define JUNO_ASSERT_POINTER_TYPE(tStatus, tPointer, tType, tApi)  JUNO_ASSERT_SUCCESS((tStatus = JunoMemory_PointerVerifyType(tPointer, tType, tApi)), return tStatus)
 
static inline JUNO_STATUS_T JunoMemory_PointerApiVerify(const JUNO_POINTER_API_T *ptPointerApi)
{
    JUNO_ASSERT_EXISTS(
        ptPointerApi &&
        ptPointerApi->Copy &&
        ptPointerApi->Reset
    );
    return JUNO_STATUS_SUCCESS;
}
 
static inline JUNO_STATUS_T JunoMemory_ValuePointerApiVerify(const JUNO_VALUE_POINTER_API_T *ptPointerApi)
{
    JUNO_ASSERT_EXISTS(
        ptPointerApi &&
        ptPointerApi->Equals
    );
    return JUNO_STATUS_SUCCESS;
}
 
static inline JUNO_STATUS_T JunoMemory_PointerVerify(const JUNO_POINTER_T tPointer)
{
    JUNO_ASSERT_EXISTS(
        tPointer.ptApi &&
        tPointer.pvAddr &&
        tPointer.zSize
    );
    JUNO_STATUS_T tStatus = JunoMemory_PointerApiVerify(tPointer.ptApi);
    JUNO_ASSERT_SUCCESS(tStatus, return tStatus);
    return tStatus;
}
 
#ifdef __cplusplus
}
#endif
#endif // JUNO_POINTER_API_H