复制一个文件

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

#define BUF_SIZE   32

int main(int argc, char  *argv[])
{
    if (argc != 3)
    {
        printf("Uage: ./copy dest src");
        return -1;
    }
    
    char *src = argv[1];
    char *dest = argv[2]; 


    FILE* file1 =  fopen(dest, "r");
    FILE* file2 =  fopen(src, "w+");


    char file1_buf[BUF_SIZE];

    while(1)
    {
        int ret = fread(file1_buf, sizeof(char), BUF_SIZE, file1);
        ret = fwrite(file1_buf, 1, ret, file2);
        if (ret < BUF_SIZE)
        {
            printf("write %s %s
" , dest, strerror(errno));
            return 0;
        }  
    }
    fclose(file1);
    fclose(file2);

    return 0;
}