;; exnl7.asm  32 bit read and print file
;;  Test _read and _write system calls windows, read, write linux
;;  removed  _ for linux
;; 
;;  nasm -f elf -Wall -Werror exnl7.asm
;;  gcc -m32 -o exnl7  exnl7.o
;;  exnl7 < exnl7file.txt > exnl7.out
;;  cat exnl7.out
	
	section .data
prompt      db 'Enter a string: ',0
prompt_len  equ $ - prompt
BUFSZ  	    equ 1024
STDIN       equ 0
STDOUT      equ 1

	section .bss
buffer  resb BUFSZ

	section .text
	global main
	extern read, write
main:
	push    prompt_len
	push    prompt
	push    STDOUT
	call    write	    ; terminal or  > file
	add     esp, 12

	push    BUFSZ - 1   ; leave space for terminating 0
	push    buffer
	push    STDIN	    ; command line or  < file
	call    read
	add     esp, 12

	push    eax         ; _read returns string length in eax
	push    buffer
	push    STDOUT
	call    write

	add     esp, 12
	mov	eax, 0
	ret