diff options
Diffstat (limited to 'cat.s')
| -rw-r--r-- | cat.s | 196 |
1 files changed, 4 insertions, 192 deletions
@@ -15,99 +15,11 @@ process_fd: cmp rax, 1 jl .ret - mov r8, rax ; buf size - mov r9, buf ; write pointer - mov r10, buf ; read pointer -.loop: - mov rcx, [r10] - and rcx, 0xff - ; SHOWENDS - mov r11, r13 - and r11, showends - cmp r11, 1 - jl .skipshowends - cmp rcx, 0x0a - jne .skipshowends - call .flushbuf - xor rcx, rcx - mov rcx, "$" - mov [smallbuf], rcx - mov rax, smallbuf - call outpstring - jmp .skipnonprinting -.skipshowends: - ; SHOWNONPRINTING - mov r11, r13 - and r11, shownonprinting - cmp r11, 1 - jl .skipnonprinting - cmp rcx, 0x0a - je .skipnonprinting -.docaret: - cmp rcx, 127 - jge .showendsm - ;cmp rcx, [r10] - ;jne .endsmflushandcont - cmp rcx, 0x20 - jge .skipnonprinting - ; carrot notation (less than 0x20) - cmp r9, r10 - je .skipnonprinting - or rcx, 0x40 - ror rcx, 8 - or rcx, "^" - and rcx, 0xffff - mov [smallbuf], rcx - dec r9 - call .flushbuf - inc r10 - inc r9 - dec r8 - mov rax, smallbuf - call outpstring - jmp .skipnonprinting -.showendsm: - ; M- notation - je .eq127 - xor rdi, rdi - or rdi, "M-" - and rdi, 0xffff - mov [smallbuf], rdi - mov rax, smallbuf - call outpstring - mov rcx, [r10] - and rcx, 0xff - mov rax, 128 - sub rcx, rax - sub [r10], rax - jmp .docaret -.eq127: - mov rcx, 0x17 - jmp .docaret - -.skipnonprinting: - - dec r8 - inc r10 - cmp r8, 0 - jl .contrwloop - call .flushbuf - jmp .loop - -.flushbuf: - mov rdx, r10 - sub rdx, r9 - mov rdi, 1 - mov rsi, r9 + mov rdx, rax mov rax, 1 + mov rdi, 1 + mov rsi, buf syscall - mov r9, r10 - ret - -.contrwloop: - ; continue loop - dec r10 - call .flushbuf mov rax, rbx jmp process_fd @@ -161,63 +73,8 @@ _start: je .cont ; basically switch() { case } - cmp r10, "b" - je .numbernonblankonly - cmp r10, "E" - je .showends - cmp r10, "n" - je .numberlines - cmp r10, "s" - je .squeezeblanks - cmp r10, "T" - je .showtabs - cmp r10, "v" - je .shownonprinting - cmp r10, "A" - je .showall - cmp r10, "e" - je .ve - cmp r10, "t" - je .vt cmp r10, "u" je .inloop - cmp r10, "h" - je .help - jmp usage - -.numbernonblankonly: - or r13, numbernonblankonly - jmp .inloop -.showends: - or r13, showends - jmp .inloop -.numberlines: - or r13, numberlines - jmp .inloop -.squeezeblanks: - or r13, squeezeblanks - jmp .inloop -.showtabs: - or r13, showtabs - jmp .inloop -.shownonprinting: - or r13, shownonprinting - jmp .inloop -.showall: - or r13, shownonprinting - or r13, showends - or r13, showtabs - jmp .inloop -.ve: - or r13, shownonprinting - or r13, showends - jmp .inloop -.vt: - or r13, shownonprinting - or r13, showtabs - jmp .inloop -.help: - or r13, 0xff jmp usage .cont: @@ -304,11 +161,6 @@ usage: call pstring mov rax, usagep2 call pstring - cmp r13, 0xff - jne errorexit - ; r13 is set to 0xff when -h flag is set - mov rax, help - call pstring jmp errorexit error: ;exit(1) @@ -348,35 +200,6 @@ pstring: ret - ; pstring to stdout - ; & preserve r8, r9, r10 -outpstring: - push r8 - push r9 - push r10 - xor r8, r8 - mov r9, rax -.loop: - mov r10, [r9] - and r10, 0xff - cmp r10, 0x00 - je .fin - - inc r8 - inc r9 - jmp .loop - -.fin: - mov rdx, r8 - mov rsi, rax - mov rdi, 1 - mov rax, 1 - syscall - pop r10 - pop r9 - pop r8 - ret - exit: ;exit(0) mov rax, 60 @@ -385,21 +208,10 @@ exit: section .data usagep1: db "Usage: ", 00 -usagep2: db " [-h] [-AbeEnstTuv] [file ...]", 10, 00 -help: db "Concatenate FILE(s) to standard output.", 10, 10, "With no FILE, or when FILE is -, read standard input.", 10, 10, " -A equivalent to -vET", 10, " -b number (in hex) nonempty output lines, overrides -n", 10, " -e equivalent to -vE", 10, " -E display $ at end of each line", 10, " -n number (in hex) all output lines", 10, " -s suppress repeated empty output lines", 10, " -t equivalent to -vT", 10, " -T display TAB characters as ^I", 10, " -u (ignored)", 10, " -v use ^ and M- notation, except for LFD and TAB", 10, " -h display this help and exit", 10, 10, "Examples:", 10, " cat f - g Output f's contents, then standard input, then g's contents.", 10, " cat Copy standard input to standard output.", 10, 00 +usagep2: db " [-u] [file ...]", 10, 00 errormsg: db "An error has occured! Unfortunately, this program isnt complex enough to display the error yet. Try using strace!", 10, 00 section .bss smallbuf: resb 8 bufSize: equ 65536 buf: resb bufSize - -numbernonblankonly: equ 0b000001 ; -b -showends: equ 0b000010 ; -E -numberlines: equ 0b000100 ; -n -squeezeblanks: equ 0b001000 ; -s -showtabs: equ 0b010000 ; -T -shownonprinting: equ 0b100000 ; -v -; -A = -vET -; -e = -vE -; -t = -vT |