asm-case
/
src
/
main.asm
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OCTOBANANA
Licensed under the MIT License
Copyright (c) 2019 Brett Robinson <https://octobanana.com/>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
%endif
bits 64
section .data
EOF: equ 0
STDIN: equ 0
STDOUT: equ 1
STDERR: equ 2
optval_uppercase: db 1
optstr_lowercase: db '-l'
optstr_lowercase_len: equ $-optstr_lowercase
map_uppercase:
db '.','.','.','.', '.','.','.','.', '.',9,10,11, '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db ' ','!','"','#', '$','%','&',"'", '(',')','*','+', ',','-','.','/'
db '0','1','2','3', '4','5','6','7', '8','9',':',';', '<','=','>','?'
DB '@','A','B','C', 'D','E','F','G', 'H','I','J','K', 'L','M','N','O'
DB 'P','Q','R','S', 'T','U','V','W', 'X','Y','Z','[', '\',']','^','_'
DB '`','A','B','C', 'D','E','F','G', 'H','I','J','K', 'L','M','N','O'
DB 'P','Q','R','S', 'T','U','V','W', 'X','Y','Z','{', '|','}','~','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
map_lowercase:
db '.','.','.','.', '.','.','.','.', '.',9,10,11, '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db ' ','!','"','#', '$','%','&',"'", '(',')','*','+', ',','-','.','/'
db '0','1','2','3', '4','5','6','7', '8','9',':',';', '<','=','>','?'
db '@','a','b','c', 'd','e','f','g', 'h','i','j','k', 'l','m','n','o'
db 'p','q','r','s', 't','u','v','w', 'x','y','z','[', '\',']','^','_'
db '`','a','b','c', 'd','e','f','g', 'h','i','j','k', 'l','m','n','o'
db 'p','q','r','s', 't','u','v','w', 'x','y','z','{', '|','}','~','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
db '.','.','.','.', '.','.','.','.', '.','.','.','.', '.','.','.','.'
section .bss
buf_len: equ 1024
buf: resb buf_len
section .text
global main
extern read, write, strlen
main:
cmp rdi, 0
jz input
mov rbp, [rsi]
opt:
push rsi
push rdi
mov rdi, rbp
call strlen
mov rcx, rax
pop rdi
pop rsi
.parse:
cmp rcx, optstr_lowercase_len
jne .cond
dec rcx
.loop:
mov al, byte [optstr_lowercase + rcx]
cmp al, byte [rbp + rcx]
jne .cond
dec rcx
jnz .loop
mov al, byte [optstr_lowercase + rcx]
cmp al, byte [rbp + rcx]
jne .cond
mov byte [optval_uppercase], 0
.cond:
lea rsi, [rsi + 8]
mov rbp, [rsi]
dec rdi
jnz opt
input:
mov rdi, STDIN
mov rsi, buf
mov rdx, buf_len
call read
cmp rax, EOF
jl quit_error
je quit
mov r12, rax
mov rcx, rax
mov rbp, buf
dec rbp
cmp byte [optval_uppercase], 0
je lowercase
uppercase:
xor rax, rax
mov al, byte [rbp + rcx]
mov al, byte [map_uppercase + rax]
mov byte [rbp + rcx], al
dec rcx
jnz uppercase
jmp output
lowercase:
xor rax, rax
mov al, byte [rbp + rcx]
mov al, byte [map_lowercase + rax]
mov byte [rbp + rcx], al
dec rcx
jnz lowercase
output:
mov rdx, r12
mov rsi, buf
mov rdi, STDOUT
call write
cmp r12, rax
jne quit_error
jmp input
quit:
xor rax, rax
ret
quit_error:
mov rax, 1
ret