C程序设计语言学习--二级指针实现字符串比较程序

将输入的字符串进行排序，使用2级指针~~

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


void swap(void *data1,void *data2,int size)
{
    char *d1 = data1;
    char *d2 = data2;
    int i;
    char tmp;

    for(i = 0 ;i < size;i ++){
        tmp = d1[i];
        d1[i] = d2[i];
        d2[i] = tmp;
    }
}

int my_sort(void *data1,void *data2)
{
    char * const *d1 = data1;
    char * const *d2 = data2;

    return strcmp(*d1,*d2);
}

void sort_comm(void *base,int num,int size,int (*cmp)(void *,void *))
{
    int i,j;
    int ret;
    char *arr = base;
    for(i = 0;i < num - 1;i ++){
        for(j = 0;j < num - i - 1;j ++){
            ret = cmp(arr + j * size,arr + (j + 1) * size);
            if(ret > 0){
                swap(arr + j * size,arr + (j + 1) * size,size);
            }
        }
    }
}



int main(int argc,char **argv)
{
    int i;

    sort_comm(argv,argc,4,my_sort);

    for(i = 0;i < argc;i ++){
        printf("%sn",argv[i]);
    }

    return 0;
}