arrays.c

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#include <stdio.h>
#include <stdlib.h>
#include "arrays.h"
 
 
void **malloc_2d(const size_t rows, const size_t cols, const size_t T)
{
    void *data= (void *) malloc(rows*cols*T);
    void **ar = (void **)malloc(rows*sizeof(void*));
    int i;
    char *p = (char*)data;
    for (i=0; i<rows; i++)
        ar[i] = &(p[cols*i*T]);
    return ar;
}
 
 
void ***malloc_3d(const size_t rows, const size_t cols, const size_t depth, const size_t T)
{
    void *data = (void *) malloc(rows*cols*depth*T);  // using calloc
    void **ar2 = (void **)malloc(rows*cols*sizeof(void*));
    void ***ar = (void ***)malloc(rows*sizeof(void**));
    int i,j;
    char *p = (char*)data;
    for (i=0; i<rows; i++){
        for (j=0; j<cols; j++){
            ar2[cols*i+j] = &(p[(cols*i+j)*depth*T]);
        }
        ar[i] = &(ar2[cols*i]);
    }
    return ar;
}
 
 
void ****malloc_4d(const size_t rows, const size_t cols, const size_t depth, const size_t dims, const size_t T) {
    void *data = (void *) malloc(rows*cols*depth*dims*T);
    void **ar3 = (void **)malloc(rows*cols*depth*sizeof(void*));
    void ***ar2 = (void ***)malloc(rows*cols*sizeof(void**));
    void ****ar = (void ****)malloc(rows*sizeof(void ***));
    int i, j, k, idx;
    char *p = (char*)data;
    for (i=0; i<rows; i++){
        for (j=0; j<cols; j++){
            for (k=0; k<depth; k++){
                ar3[(i*cols+j)*depth+k] = &p[((i*cols+j)*depth+k)*dims*T];
            }
            ar2[i*cols+j] = &ar3[(i*cols+j)*depth];
        }
        ar[i] = &ar2[i*cols];
    }
    return ar;
}
 
 
void dealloc_2d(void **mat)
{
    free(*mat);
    free(mat);
}
 
 
void dealloc_3d(void ***mat)
{
    free(**mat);
    free(*mat);
    free(mat);
}
 
void dealloc_4d(void ****mat) {
    free(***mat);
    free(**mat);
    free(*mat);
    free(mat);
}