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(0);
    }
if ((fout=fopen(to,"wb"))==NULL) {
        perror("fopen fileout");
        exit(0);
    }

    while(!feof(fin)) {
        size = fread(buf, 1, TRAN_SZIE, fin);
        fwrite(buf, 1, size, fout);
    }

    fclose(fin);
    fclose(fout);

return 0;
}

int main(int argc, char * argv[])
{
    int ret = 0;
    if (argc!=3) {
        printf("Usage: %s filein fileout
", argv[0]);
        exit(0);
    }

    ret = copy_bin(argv[1], argv[2]);

    return ret;
}

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