wow it now reads one char!!!

build.sh

@@ -1,5 +1,7 @@
 set -ex
 
+mkdir -p tmp bin
+
 echo "compiling true"
 nasm -f elf64 -o tmp/true.o src/true/true.asm
 ld -s --nmagic -o bin/true tmp/true.o
@@ -10,7 +12,12 @@ nasm -f elf64 -o tmp/false.o src/false/false.asm
 ld -s --nmagic -o bin/false tmp/false.o
 ls -l bin/false
 
-echo "compiling cat"
+echo "compiling rd"
-nasm -f elf64 -o tmp/cat.o src/cat/cat.asm
+nasm -f elf64 -o tmp/rd.o src/rd/rd.asm
-ld -s -o bin/cat tmp/cat.o
+ld -s -o bin/rd tmp/rd.o
-ls -l bin/cat
+ls -l bin/rd
+
+echo "compiling txt"
+nasm -f elf64 -o tmp/txt.o src/txt/txt.asm
+ld -s -o bin/txt tmp/txt.o
+ls -l bin/txt

src/txt/txt.asm

@@ -0,0 +1,87 @@
+%define STDIN 0
+%define STDOUT 1
+%define STDERR 2
+
+%define SYS_READ 0
+%define SYS_WRITE 1
+%define SYS_IOCTL 16
+%define SYS_EXIT 60
+
+%define TCGETS 0x5401
+%define TCSETS 0x5402
+
+section .data
+    ioctl_err_m db "ioctl error", 10, 0
+
+section .bss
+    orig_termios resb 60
+    raw_termios resb 60
+    cbuf resb 4
+    
+section .text
+    global _start
+    
+_start:
+    mov rax, SYS_IOCTL
+    mov rdi, STDIN
+    mov rsi, TCGETS
+    mov rdx, orig_termios
+    syscall
+    
+    test rax, rax
+    js ioctl_err
+    
+    mov rcx, 15
+    mov rsi, orig_termios
+    mov rdi, raw_termios
+    rep movsd
+    
+    mov eax, [raw_termios + 12]
+    and eax, ~(2 | 8 | 1)
+    mov [raw_termios + 12], eax
+    
+    mov rax, SYS_IOCTL
+    mov rdi, STDIN
+    mov rsi, TCSETS
+    mov rdx, raw_termios
+    syscall
+    
+    mov rax, SYS_READ
+    mov rdi, STDIN
+    mov rsi, cbuf
+    mov rdx, 4
+    syscall
+    
+    mov rdx, rax
+    mov rax, SYS_WRITE
+    mov rdi, STDOUT
+    mov rsi, cbuf
+    syscall
+    
+    mov rax, SYS_IOCTL
+    mov rdi, STDIN
+    mov rsi, TCSETS
+    mov rdx, orig_termios
+    syscall
+    
+    jmp exit
+
+ioctl_err:
+    args_err:
+    mov rax, SYS_WRITE
+    mov rdi, STDERR
+    mov rsi, ioctl_err_m
+    mov edx, 12
+    syscall
+
+    jmp exit_err
+
+exit_err:
+    mov rax, SYS_EXIT
+    mov rdi, 1
+    syscall
+
+exit:
+    mov rax, SYS_EXIT
+    mov rdi, 0
+    syscall