client__pollin: read as much as possible; client__pollout: do processing

readline.s

@@ -1,43 +1,20 @@
 ; Returns:
-; rax - read(2) length
-; rdi - if line is complete, line length;
-;       if line was incomplete, 0;
-;       if EOF or read(2) returned an error, undefined
-; Errors (in rax):
-; -1024 - line too long
-; other negative - error from read(2)
-; 0 - EOF from read(2)
+; rax - if line: line length; otherwise: 0
 ; Arguments:
-; rdi - fd
-; rsi - buffer
-; rdx - max length
-readline:
-    push rsi
-    push rdx
-    mov rax, SYS_READ
-    syscall
-    pop rdx
-    pop rsi
-    cmp rax, 0
-    jl return
-    mov r10, 0
+; rdi - buffer
+; rsi - max length
+scanline:
+    mov rax, 0
 
-readline__scan:
-    cmp r10, rdx
-    jge readline__overflow
-    cmp r10, rax
-    jge readline__incomplete_line
-    mov r11b, [rsi + r10]
-    add r10, 1
-    cmp r11b, 0x0a  ; '\n'
-    jne readline__scan
-    mov rdi, r10
+scanline__loop:
+    cmp rax, rsi
+    jge scanline__incomplete_line
+    mov r10b, [rdi + rax]
+    add rax, 1
+    cmp r10b, 0x0a  ; '\n'
+    jne scanline__loop
     ret
 
-readline__incomplete_line:
-    mov rdi, 0
-    ret
-
-readline__overflow:
-    mov rax, -1024
+scanline__incomplete_line:
+    mov rax, 0
     ret