read-records.s

   1 .include "linux.s"
   2 .include "record-def.s"
   3
   4 .section .data
   5 file_name:
   6 .ascii "text.dat\0"
   7
   8 .section .bss
   9 .lcomm record_buffer, RECORD_SIZE
  10
  11 .section .text
  12 .globl _start
  13 _start:
  14 .equ ST_INPUT_DESCRIPTOR, -4
  15 .equ ST_OUTPUT_DESCRIPTOR, -8
  16
  17 movl %esp, %ebp
  18 subl $8, %esp
  19
  20 movl $SYS_OPEN, %eax
  21 movl $file_name, %ebx
  22 movl $0, %ecx
  23 movl $0666, %edx
  24 int $LINUX_SYSCALL
  25
  26 movl %eax, ST_INPUT_DESCRIPTOR(%ebp)
  27 movl $STDOUT, ST_OUTPUT_DESCRIPTOR(%ebp)
  28
  29 record_read_loop:
  30 pushl ST_INPUT_DESCRIPTOR(%ebp)
  31 pushl $record_buffer
  32 addl $8, %esp
  33
  34 cmpl $RECORD_SIZE, %eax
  35 jne finished_reading
  36
  37 pushl $RECORD_FIRSTNAME + record_buffer
  38 call count_chars
  39 addl $4, %esp
  40
  41 movl %eax, %edx
  42 movl ST_OUTPUT_DESCRIPTOR(%ebp), %ebx
  43 movl $SYS_WRITE, %eax
  44 movl $RECORD_FIRSTNAME + record_buffer, %ecx
  45 int $LINUX_SYSCALL
  46
  47 pushl ST_OUTPUT_DESCRIPTOR(%ebp)
  48 call write_newline
  49 addl $4, %esp
  50
  51 jmp record_read_loop
  52
  53 finished_reading:
  54 movl $SYS_EXIT, %eax
  55 movl $0, %ebx
  56 int $LINUX_SYSCALL