echo server, multiple clients, lines <256 bytes

clients.s

@@ -0,0 +1,69 @@
+; edi - fd
+clients__append:
+    ; TODO check against client_capacity
+    mov r10, [clients_len]
+    imul r10, client_size
+    add r10, clients
+    mov [r10], edi
+
+    add qword [clients_len], 1
+
+    mov r11, 4
+
+clients__append__write_zeros:
+    cmp r11, 8
+    jge return
+    mov byte [r10 + r11], 0
+    add r11, 1
+    jmp clients__append__write_zeros
+
+; edi - fd
+clients__search:
+    mov r11, [clients_len]
+    imul r11, client_size
+    add r11, clients
+    mov r10, clients
+
+clients__search__loop:
+    cmp r10, r11
+    jge clients__search__fail
+    mov r8d, [r10]
+    cmp r8d, edi
+    je clients__search__succ
+    add r10, client_size
+    jmp clients__search__loop
+
+clients__search__fail:
+    mov r10, -1
+
+clients__search__succ:
+    mov rax, r10
+    ret
+
+; rdi - address of client within clients array
+clients__remove:
+    mov r10, [clients_len]
+    cmp r10, 1
+    jle clients__clear
+
+    add r10, -1
+    mov [clients_len], r10
+
+    mov r10, 0
+    mov r11, r10
+    imul r11, client_size
+    add r11, clients
+
+clients__remove__loop:
+    cmp r10, client_size
+    jge return
+    mov r8b, [r11 + r10]
+    mov [rdi + r10], r8b
+    add r10, 1
+    jmp clients__remove__loop
+
+; rdi - address of client within clients array
+clients__clear:
+    mov r10, 0
+    mov [clients_len], r10
+    ret