Asmio

Set of macroses for simple input/output in x86 Netwide Assembler (NASM) for Linux

How to use

Include in code

; Copy asmio.inc in your project and move this header to your program
%include "asmio.inc"

Usage examples

You can find usage examples in test.asm file. Also, you can build test with make command.

Table of file descriptor definitions

Definition	Meaning
stdin	standard input file descriptor
stdout	standard output file descriptor
stderr	standard error file descriptor

Table of open definitions

Definition	Meaning
O_RDONLY	only reading
O_WRONLY	only reading
O_RDWR	reading/writing
O_CREAT	create file
O_EXCL	have to create file
O_TRUNC	truncate file
O_APPEND	write in end of file

Table of additional open definitions

Definition	Meaning
AO_R	only reading
AO_R+	reading/writing
AO_W	truncate, writing
AO_W+	truncate, reading/writing
AO_A	writing in end of file

Table of mode open definiitions

Definition	Meaning
MO_ALL	reading/writing for all
MO_OWNER	reading/writing for owner

Table of macros

Macro	Args	Return
_syscall	1-4 args for system calls	same as syscall you calling
vcall	1-* args, first have to be label	same as your function
strlen	null-terminated string	its length
exit	exit status or nothing on success	nothing can be returned
read	file descriptor, buffer, count	how much chars were read, 0 on end of file
write	file descriptor, buffer, count	how much chars were wrote
open	file path, how to open, mode only if we create file	file descriptor
close	file descriptor	don't check it
getargc	where to move args count	nothing
getargv	where to move args variables	nothing
fgetc	file descriptor	character, -1 on failure
getc	nothing	character, -1 on failure
fputc	file descriptor, character	non-zero on success
putc	character	non-zero on success
fputs	file descriptor, null-terminated string	non-zero value on success
puts	null-terminated string	non-zero value on success
fgets	file descriptor, buffer, size	non-zero value on success
gets	string, size	non-zero value
fprint	file desctiptor, string in "quotes"	non-zero value on success
print	string in "quotes"	non-zero on success