readtest2.s

*****汇编语言程序设计 源代码*****

# readtest2.s - A more complicated example of reading data from a file
.section .bss
   .lcomm buffer, 10
   .lcomm filehandle, 4
.section .text
.globl _start
_start:
   nop
   movl %esp, %ebp
   movl $5, %eax
   movl 8(%ebp), %ebx
   movl $00, %ecx
   movl $0444, %edx
   int $0x80
   test %eax, %eax
   js badfile
   movl %eax, filehandle

read_loop:
   movl $3, %eax
   movl filehandle, %ebx
   movl $buffer, %ecx
   movl $10, %edx
   int $0x80
   test %eax, %eax
   jz done
   js done
   movl %eax, %edx

   movl $4, %eax
   movl $1, %ebx
   movl $buffer, %ecx
   int $0x80
   test %eax, %eax
   js badfile
   jmp read_loop

done:
   movl $6, %eax
   movl filehandle, %ebx
   int $0x80

badfile:
   movl %eax, %ebx
   movl $1, %eax
   int $0x80