有人可以告訴我如何用1字節長的緩衝區讀取10個字節？

Question

有人可以告訴我如何讀取10字節長1字節的緩衝區？

我的編程環境是Ubuntu Linux操作系統，emacs的，大會在& T語法

我可以讀取文件並保存讀取數據緩衝（1字節）

，但我怎麼能讀取文件的下一字節並保存到緩衝區？

我編輯的內容粘貼我的努力

.section .data 

    .section .bss 
    .lcomm buffer,1 

    .section .text 
    .global _start 

_start: 
    movl %esp,%ebp 
    subl $8,%esp 
    #8(%ebp) is 2nd arg == input 
    #12(%ebp) is 3rd arg == output 

    #open,read,open,write,close 
    movl $5,%eax 
    movl 8(%ebp),%ebx 
    movl $0,%ecx 
    movl $0666,%edx 
    int $0x80 
    #%eax contains input's fd 
    #movl to first local var 
    movl %eax,-4(%ebp) 

    movl $5,%eax 
    movl 12(%ebp),%ebx 
    movl $03101,%ecx 
    movl $0666,%edx 
    int $0x80 
    #eax contains output's fd 
    #movl to second local var 
    movl %eax,-12(%ebp) 

    #read 1 byte from file 1st byte of data 
    movl $3,%eax 
    movl -4(%ebp),%ebx 
    movl $buffer,%ecx 
    movl $1,%edx 
    int $0x80 

    #read 1 byte from file I expect 2nd byte of data 
    movl $3,%eax 
    movl -4(%ebp),%ebx 
    movl $buffer,%ecx 
    movl $1,%edx 
    int $0x80 

    #buffer contains 1 byte of file 
    subb $48, buffer 
    movl buffer,%ebx 
    movl $1,%eax 
    int $0x80 

Answer 1

jcomeau@intrepid:/tmp$ nasm -f elf -o test.o test.nasm 
jcomeau@intrepid:/tmp$ ld -o test test.o 
jcomeau@intrepid:/tmp$ ./test 
0 # this is what I typed 
jcomeau@intrepid:/tmp$ 
jcomeau@intrepid:/tmp$ echo $? 
48 
jcomeau@intrepid:/tmp$ cat test.nasm 
global _start 
_start: 
push eax ; for buffer 
mov ecx, esp 
mov edx, 1 ; # bytes to read 
mov ebx, 0 ; stdin 
mov eax, 3 ; read 
int 0x80 
mov ebx, [ecx] ; what we just read 
mov eax, 1 ; exit 
int 0x80 

，你仍然需要建立循環您的10個字符，並轉換爲ATT語法，但是這應該讓你開始。