c语言: 文件io, 拷贝文件(二进制)

#include <stdio.h>
#include <stdlib.h>
#define TRAN_SZIE 1024
int copy_bin(char* from, char* to)
{
    FILE *fin, *fout;
    int size;
    char buf[TRAN_SZIE];
    if ((fin=fopen(from,"rb"))==NULL) {
        perror("fopen filein");
        exit();
    }
    if ((fout=fopen(to,"wb"))==NULL) {
        perror("fopen fileout");
        exit();
    }

    while(!feof(fin)) {
        size = fread(buf, , TRAN_SZIE, fin);
        fwrite(buf, , size, fout);
    }

    fclose(fin);
    fclose(fout);

    return ;
}

int main(int argc, char * argv[])
{
    int ret = ;
    if (argc!=) {
        printf("Usage: %s filein fileout\n", argv[]);
        exit();
    }

    ret = copy_bin(argv[], argv[]);

    return ret;
}

/*
[root@localhost]# ./copy_bin IMG1.jpg IMG2.jpg
[root@localhost]# diff IMG1.jpg IMG2.jpg
*/