From eae5db135d3874039fc1ddc8152ba1b0b6c77726 Mon Sep 17 00:00:00 2001
From: Navid Samanghoon <nsama24@student.sdu.dk>
Date: Mon, 6 Oct 2025 19:10:07 +0200
Subject: feat(outputGenerator.s): suggestion to how we print the sorted buffer

---
 src/outputGenerator.s | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 src/outputGenerator.s

(limited to 'src')

diff --git a/src/outputGenerator.s b/src/outputGenerator.s
new file mode 100644
index 0000000..8a885d1
--- /dev/null
+++ b/src/outputGenerator.s
@@ -0,0 +1,142 @@
+.section .data
+newline: 
+    .byte 10             # '\n'
+
+tab:
+    .byte 9              # '\tab'
+
+
+# --------------------------------------------
+# FUNCTION: print_tab
+# PURPOSE : print a tab character ('\t')
+# INPUTS  : 
+# OUTPUTS : 
+# CLOBBERS: rax, rdi, rsi, rdx
+# --------------------------------------------
+.globl print_tab
+.type print_tab, @function
+print_tab:
+    movq $1, %rax       # write
+    movq $1, %rdi       # stdout
+    movq $tab, %rsi     # load tab character
+    movq $1, %rdx       # 1 byte
+    syscall
+    ret
+
+
+# --------------------------------------------
+# FUNCTION: print_newline
+# PURPOSE : print a newline character ('\n')
+# INPUTS  : 
+# OUTPUTS : 
+# CLOBBERS: rax, rdi, rsi, rdx
+# --------------------------------------------
+.globl print_newline
+.type print_newline, @function
+print_newline:
+    movq $1, %rax       # write
+    movq $1, %rdi       # stdout
+    movq $newline, %rsi # load newline character
+    movq $1, %rdx       # 1 byte
+    syscall
+    ret
+
+
+# --------------------------------------------
+# FUNCTION: print_buffer
+# PURPOSE : take a buffer of coordinates and print each coordinate on a line
+# INPUTS  : rdi = pointer to buffer, rsi = number of coordinates
+# OUTPUTS : 
+# CLOBBERS: rax, rdi, 
+# --------------------------------------------
+.globl print_buffer
+.type print_buffer, @function
+print_buffer:
+    cmpq $0, %rsi
+    jle done                # if n > 0 print_coordinate
+
+    movq %rdi, %rdx         # keep pointer here, rdi will be used for printNum
+
+loop:
+    # print x and tab
+    movq (%rdx), %rdi       # load x
+    call printNum
+    push %rdx               # save pointer
+    push %rsi               # save n
+    call print_tab
+    pop %rsi                # retrieve n
+    pop %rdx                # retrieve pointer
+
+    # print y and newline
+    movq 8(%rdx), %rdi      # load y
+    call printNum
+    push %rdx               # save pointer
+    push %rsi               # save n
+    call print_newline
+    pop %rsi                # retrieve n
+    pop %rdx                # retrieve pointer
+
+    # move to next coordinate and decq n
+    addq $16, %rdx
+    decq %rsi
+
+    cmpq $0, %rsi
+    jg loop
+
+done:
+ret
+
+
+# Print RDI as an unsigned integer without any new line.
+# Note: the function does not follow the ordinary calling convention,
+#       but restores all registers.
+.type printNum, @function
+.globl printNum
+printNum:
+	push %rbp
+	movq %rsp, %rbp
+
+	# save
+	push %rax
+	push %rdi
+	push %rsi
+	push %rdx
+	push %rcx
+	push %r8
+	push %r9
+
+	movq %rdi, %rax # arg
+    movq $0, %r9    # digit count
+.LprintNum_convertLoop:
+	movq $0, %rdx
+	movq $10, %rcx
+	idivq %rcx
+	addq $48, %rdx # '0' is 48
+	push %rdx
+	addq $1, %r9
+	cmpq $0, %rax   
+	jne .LprintNum_convertLoop
+.LprintNum_printLoop:
+	movq $1, %rax # sys_write
+	movq $1, %rdi # stdout
+	movq %rsp, %rsi # buf
+	movq $1, %rdx # len
+	syscall
+	addq $8, %rsp
+	addq $-1, %r9
+	jne .LprintNum_printLoop
+
+	# restore
+	pop %r9
+	pop %r8
+	pop %rcx
+	pop %rdx
+	pop %rsi
+	pop %rdi
+	pop %rax
+
+	movq %rbp, %rsp
+	pop %rbp
+	ret
+
+
-- 
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