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fix for reading stdin

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This commit is contained in:
igor
2025-12-19 11:32:12 +01:00
parent 452bb0318b
commit 72cb28157b
12 changed files with 139 additions and 122 deletions
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186
build/test_read_stdin.asm
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@@ -37,97 +37,11 @@ word_r_40:
mov [r12], rax
ret
ret
word_puts:
; detects string if top is len>=0 and next is a pointer in [data_start, data_end]
mov rax, [r12] ; len or int value
mov rbx, [r12 + 8] ; possible address
cmp rax, 0
jl puts_print_int
lea r8, [rel data_start]
lea r9, [rel data_end]
cmp rbx, r8
jl puts_print_int
cmp rbx, r9
jge puts_print_int
; treat as string: (addr below len)
mov rdx, rax ; len
mov rsi, rbx ; addr
add r12, 16 ; pop len + addr
test rdx, rdx
jz puts_str_newline_only
mov rax, 1
mov rdi, 1
syscall
puts_str_newline_only:
mov byte [rel print_buf], 10
mov rax, 1
mov rdi, 1
lea rsi, [rel print_buf]
mov rdx, 1
syscall
ret
puts_print_int:
mov rax, [r12]
add r12, 8
mov rbx, rax
mov r8, 0
cmp rbx, 0
jge puts_abs
neg rbx
mov r8, 1
puts_abs:
lea rsi, [rel print_buf_end]
mov rcx, 0
mov r10, 10
cmp rbx, 0
jne puts_digits
dec rsi
mov byte [rsi], '0'
inc rcx
jmp puts_sign
puts_digits:
puts_loop:
xor rdx, rdx
mov rax, rbx
div r10
add dl, '0'
dec rsi
mov [rsi], dl
inc rcx
mov rbx, rax
test rbx, rbx
jne puts_loop
puts_sign:
cmp r8, 0
je puts_finish_digits
dec rsi
mov byte [rsi], '-'
inc rcx
puts_finish_digits:
mov byte [rsi + rcx], 10
inc rcx
mov rax, 1
mov rdi, 1
mov rdx, rcx
mov r9, rsi
mov rsi, r9
syscall
ret
word_dup:
mov rax, [r12]
sub r12, 8
mov [r12], rax
ret
word_write_buf:
mov rdx, [r12] ; len
mov rsi, [r12 + 8] ; addr
add r12, 16 ; pop len + addr
mov rax, 1 ; syscall: write
mov rdi, 1 ; fd = stdout
syscall
ret
ret
word_drop:
add r12, 8
ret
@@ -532,26 +446,29 @@ word_read_stdin:
cmp rax, -4095
jae .fail_mmap
mov rbx, rax ; buffer addr
xor rcx, rcx ; bytes_read = 0
xor r9, r9 ; bytes_read = 0
.read_loop:
mov rax, 0 ; syscall: read
mov rdi, 0 ; fd = stdin
lea rsi, [rbx + rcx] ; buf + offset
lea rsi, [rbx + r9] ; buf + offset
mov rdx, r14
sub rdx, rcx ; remaining = max_len - bytes_read
sub rdx, r9 ; remaining = max_len - bytes_read
syscall
cmp rax, 0
je .done_read
js .read_error
add rcx, rax
cmp rcx, r14
add r9, rax
jl .read_loop
.done_read:
; push len (rcx) then addr (rbx)
cmp r9, r14
je .done_no_null
mov byte [rbx + r9], 0
.done_no_null:
sub r12, 16
mov [r12], rcx
mov [r12], r9
mov [r12 + 8], rbx
ret
@@ -568,6 +485,91 @@ word_read_stdin:
mov qword [r12 + 8], 0
ret
ret
word_puts:
; detects string if top is len>=0 and next is a pointer in [data_start, data_end]
mov rax, [r12] ; len or int value
mov rbx, [r12 + 8] ; possible address
cmp rax, 0
jl puts_print_int
lea r8, [rel data_start]
lea r9, [rel data_end]
cmp rbx, r8
jl puts_print_int
cmp rbx, r9
jge puts_print_int
; treat as string: (addr below len)
mov rdx, rax ; len
mov rsi, rbx ; addr
add r12, 16 ; pop len + addr
test rdx, rdx
jz puts_str_newline_only
mov rax, 1
mov rdi, 1
syscall
puts_str_newline_only:
mov byte [rel print_buf], 10
mov rax, 1
mov rdi, 1
lea rsi, [rel print_buf]
mov rdx, 1
syscall
ret
puts_print_int:
mov rax, [r12]
add r12, 8
mov rbx, rax
mov r8, 0
cmp rbx, 0
jge puts_abs
neg rbx
mov r8, 1
puts_abs:
lea rsi, [rel print_buf_end]
mov rcx, 0
mov r10, 10
cmp rbx, 0
jne puts_digits
dec rsi
mov byte [rsi], '0'
inc rcx
jmp puts_sign
puts_digits:
puts_loop:
xor rdx, rdx
mov rax, rbx
div r10
add dl, '0'
dec rsi
mov [rsi], dl
inc rcx
mov rbx, rax
test rbx, rbx
jne puts_loop
puts_sign:
cmp r8, 0
je puts_finish_digits
dec rsi
mov byte [rsi], '-'
inc rcx
puts_finish_digits:
mov byte [rsi + rcx], 10
inc rcx
mov rax, 1
mov rdi, 1
mov rdx, rcx
mov r9, rsi
mov rsi, r9
syscall
ret
word_write_buf:
mov rdx, [r12] ; len
mov rsi, [r12 + 8] ; addr
add r12, 16 ; pop len + addr
mov rax, 1 ; syscall: write
mov rdi, 1 ; fd = stdout
syscall
ret
ret
word_main:
; push 1024
sub r12, 8