这算fread的BUG吗吗吗

环境：VC2008 SP1

 

 

 

ReadMe.txt内容：

1111;
2222;
3333;

 

 

const int BUFFER = 1024*20;
int _tmain(int argc, _TCHAR* argv[])
{
    char buffer[BUFFER];
    memset(buffer, 0, BUFFER);

    FILE *pFile;
    pFile = fopen("ReadMe.txt", "r");
    if(NULL==pFile)
    {
        printf("err, %d\n", GetLastError());
        return 0;
    }

    int nHasRead;
    nHasRead = fread(buffer, 1, BUFFER, pFile);
    //buffer[nHasRead]='\0';

    printf("fread size:%d, \n%s\n", nHasRead, buffer);
    fclose(pFile);


    return 0;
}

 

输出

fread size:17,
1111;
2222;
3333;3;
请按任意键继续. . .


const int BUFFER = 1024*20;改为 1024*4-1;

输出
fread size:17,
1111;
2222;
3333;
请按任意键继续. . .