#include<stdio.h>
#include<stdlib.h>
#include<string.h>

// タイプ識別子
typedef enum {
    VTP_CHAR = 0,
    VTP_INT,
    //…
} V_TYPE;

// タイプごとのサイズ
enum {
    TSZ_CHAR = sizeof(char),
    TSZ_INT = sizeof(int),
    //…
};

// 本体データ
typedef struct _VARIANT {
    char m_name[256];
    V_TYPE m_type;
    int m_size;                 // = memsize = sizeof(…) * n
    void *m_data;
} VARIANT;

VARIANT *mk_arr(char *name, char *type, int n)
{
    VARIANT *p_tmp;
    int sz;
    V_TYPE tp;

    // check
    if (0 == strcmp(type, "char")) {
        sz = TSZ_CHAR;
        tp = VTP_CHAR;
    } else if (0 == strcmp(type, "int")) {
        sz = TSZ_INT;
        tp = VTP_INT;
//…} else if (0 == strcmp(type, "……")) {
//…    ;
    } else {
        return NULL;
    }

    // alloc
    if (NULL == (p_tmp = malloc(sizeof(VARIANT)))) {
        return NULL;
    }
    // set
    strcpy(p_tmp->m_name, name);
    p_tmp->m_type = tp;
    p_tmp->m_size = sz * n;
    if (0 == (p_tmp->m_data = malloc(p_tmp->m_size))) {
        free(p_tmp);
        return NULL;
    } else {
        return p_tmp;
    }
}

void del_arr(VARIANT * p)
{
    free(p->m_data);
    free(p);
}

int main()
{
    VARIANT *p;
    char name[] = "str";
    char type[] = "int";
    int n = 10;

    if (NULL == (p = mk_arr(name, type, n))) {
        printf("作成失敗\n");
        return 1;
    } else {
        printf("作成しました　%s %s[%d]\n", type, name, n);
    }
    del_arr(p);

    return 0;
}