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fix for reading stdin

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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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15
build/loops_and_cmp.asm
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@@ -446,26 +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