Pointers to Functions bubble sort Program example 6 in C programming language

 Pointers to Functions bubble Program Example 6 : 

 /*--------------------- bubble6.c ---------------------*/
/* Program bubble_6.c from PTRTUT10.HTM   6/13/97 */
#include <stdio.h>
#include <string.h>

#define MAX_BUF 256

char arr2[5][20] = {  "Mickey Mouse",
                      "Donald Duck",
                      "Minnie Mouse",
                      "Goofy",
                      "Ted Jensen" };

void bubble(void *p, int width, int N);
int compare(void *m, void *n);

int main(void)
{
    int i;
    putchar('\n');

    for (i = 0; i < 5; i++)
    {
        printf("%s\n", arr2[i]);
    }
    bubble(arr2, 20, 5);
    putchar('\n\n');

    for (i = 0; i < 5; i++)
    {
        printf("%s\n", arr2[i]);
    }
    return 0;
}

void bubble(void *p, int width, int N)
{
    int i, j, k;
    unsigned char buf[MAX_BUF];
    unsigned char *bp = p;

    for (i = N-1; i >= 0; i--)
    {
        for (j = 1; j <= i; j++)
        {
          k = compare((void *)(bp + width*(j-1)), (void *)(bp +
j*width));
          if (k > 0)
            {
             memcpy(buf, bp + width*(j-1), width);
             memcpy(bp + width*(j-1), bp + j*width , width);
             memcpy(bp + j*width, buf, width);
            }
        }
    }
}

int compare(void *m, void *n)
{
    char *m1 = m;
    char *n1 = n;
    return (strcmp(m1,n1));
}

/*------------------- end of bubble6.c ---------------------*/