ccore/include/core/ToString.h

#ifndef CORE_TO_STRING_H
#define CORE_TO_STRING_H

#include "core/Check.h"
#include "core/Types.h"

check_format(3, 4) size_t
    coreToString(char* buffer, size_t n, const char* format, ...);
size_t toStringSize(const size_t* p, char* buffer, size_t n);
size_t toStringInt(const int* p, char* buffer, size_t n);
void stringAdd(size_t* w, char** buffer, size_t* n, size_t shift);

#define STRUCT_TO_STRING(type)                                                 \
    struct type##T;                                                            \
    size_t toString##type(const struct type##T* a, char* buffer, size_t n);

STRUCT_TO_STRING(BitArray)
STRUCT_TO_STRING(Box)
STRUCT_TO_STRING(Matrix)
STRUCT_TO_STRING(Plane)

// clang-format off
#define PAIR(a, b) a: b
#define STRUCT_PAIR(name)                                                      \
    PAIR(const struct name##T*, toString##name), PAIR(struct name##T*, toString##name)
// clang-format on

#define toString(t, ...)                                                       \
    _Generic((t),                                                              \
        char*: coreToString,                                                   \
        STRUCT_PAIR(BitArray),                                                 \
        STRUCT_PAIR(Box),                                                      \
        STRUCT_PAIR(Matrix),                                                   \
        STRUCT_PAIR(Plane))(t, __VA_ARGS__)

#endif