diff options
Diffstat (limited to 'cat.s')
| -rw-r--r-- | cat.s | 86 |
1 files changed, 70 insertions, 16 deletions
@@ -19,7 +19,8 @@ process_fd: mov r9, buf ; write pointer mov r10, buf ; read pointer .loop: - mov r11, r13 ; flags (for ANDing) + ; SHOWENDS + mov r11, r13 and r11, showends cmp r11, 1 jl .skipshowends @@ -32,14 +33,49 @@ process_fd: mov rcx, "$" mov [smallbuf], rcx mov rax, smallbuf - push r8 - push r9 - push r10 call outpstring - pop r10 - pop r9 - pop r8 .skipshowends: + ; SHOWNONPRINTING + mov r11, r13 + and r11, shownonprinting + cmp r11, 1 + jl .skipnonprinting + mov rcx, [r10] + and rcx, 0xff + cmp rcx, 127 + jge .showendsm + mov rcx, [r10] + and rcx, 0xff + cmp rcx, 0x20 + jge .skipnonprinting + ; carrot notation + cmp rcx, 10 + je .skipnonprinting +.showendsm: + ; M- notation + je .eq127 + xor rcx, rcx + mov rcx, "M-" + mov [smallbuf], rcx + mov rax, smallbuf + call outpstring + xor rcx, rcx + mov rcx, [r10] + and rcx, 0xff + sub rcx, 128 + mov [smallbuf], rcx + mov rax, smallbuf + call outpstring + + jmp .skipnonprinting +.eq127: + xor rcx, rcx + mov rcx, "^?" + mov [smallbuf], rcx + mov rax, smallbuf + call outpstring +.skipnonprinting: + dec r8 inc r10 cmp r8, 0 @@ -52,13 +88,7 @@ process_fd: mov rdi, 1 mov rsi, r9 mov rax, 1 - push r8 - push r9 - push r10 syscall - pop r10 - pop r9 - pop r8 mov r9, r10 ret @@ -185,9 +215,22 @@ _start: ; actual FD processor loop final: - mov [smallbuf], r13 - mov rax, smallbuf - call pstring + ; check for actual arguments + mov rbp, rsp + mov r12, [rbp] + add rbp, 8 * 2 + xor rdx, rdx +.loop2: + cmp r12, 2 + jl .cont2 + add rdx, [rbp] + add rbp, 8 + sub r12, 1 + jmp .loop2 + +.cont2: + cmp rdx, 1 + jl .sstdin ; fix rbp and r12 mov rbp, rsp mov r12, [rbp] @@ -234,6 +277,8 @@ final: sub r12, 1 jmp .loop +.sstdin: + mov r12, 1 .stdin: mov rax, 0 call process_fd @@ -268,6 +313,7 @@ errorexit: pstring: ; r8 is length ; r9 is a cached buffer for operations + xor r8, r8 mov r9, rax .loop: @@ -287,10 +333,15 @@ pstring: mov rdi, 2 mov rax, 1 syscall + ret ; pstring to stdout + ; & preserve r8, r9, r10 outpstring: + push r8 + push r9 + push r10 xor r8, r8 mov r9, rax .loop: @@ -309,6 +360,9 @@ outpstring: mov rdi, 1 mov rax, 1 syscall + pop r10 + pop r9 + pop r8 ret exit: |