.include "linux.s"
.include "record-def.s"

.section .data

# Constant data of the records we want to write
# Each data item is padded to the proper length
# With null (i.e 0) bytes

# .rept is used to pad each item. .rept tells the assembler to repeat the
# section between .rept and .endr the number of times specified.
# This is used in this program to add extra null chars at the end of each field
# to fill the record up to the record size.

# START OF RECORDS
record1:
	# First name
	.ascii "Fredrick\0"
	.rept 31 # Padding to 40 bytes
	.byte 0
	.endr

	# Last name
	.ascii "Bardlet\0"
	.rept 31 # Padding to 40 bytes
	.byte 0
	.endr

	# Address
	.ascii "4242 S Prairie\nTulsa, OK 55555\0"
	.rept 209 # Padding to 240 bytes
	.byte 0
	.endr

	# Age
	.long 45 # Field is 8 bytes long (1 word)

record2:
	# First name
	.ascii "Marilyn\0"
	.rept 32 # Padding to 40 bytes
	.byte 0
	.endr

	# Last name
	.ascii "Taylor\0"
	.rept 33 # Padding to 40 bytes
	.byte 0
	.endr

	# Address
	.ascii "2224 S Johannan St\nChicago, IL 12345\0"
	.rept 203 # Padding to 240 bytes
	.byte 0
	.endr

	# Age
	.long 29 # Field is 8 bytes long (1 word)

record3:
	# First name
	.ascii "Derrick\0"
	.rept 32 # Padding to 40 bytes
	.byte 0
	.endr

	# Last name
	.ascii "McIntire\0"
	.rept 31 # Padding to 40 bytes
	.byte 0
	.endr

	# Address
	.ascii "500 W Oakland\nSan Diego, CA 54321\0"
	.rept 206 # Padding to 240 bytes
	.byte 0
	.endr

	# Age
	.long 36 # Field is 8 bytes long (1 word)

# END OF RECORDS


.section .text
# File we'll be writing to
file_name:
	.ascii "test.dat\0"

.equ ST_FILE_DESCRIPTOR, -8

.globl _start
.global write_record

_start:
	movq %rsp, %rbp
	subq $8, %rsp	# Allocate space in stack for FD

	# Open file
	movq $SYS_OPEN, %rax
	movq $file_name, %rdi
	movq $0101, %rsi	# Open for writing, create if it doesn't exist
	movq $0666, %rdx
	syscall

	# Store FD:
	movq %rax, ST_FILE_DESCRIPTOR(%rbp)

	# Write first record
	pushq ST_FILE_DESCRIPTOR(%rbp)
	pushq $record1
	call write_record
	addq $16, %rsp		#cleanup stack

	# Write second record
	pushq ST_FILE_DESCRIPTOR(%rbp)
	pushq $record2
	call write_record
	addq $16, %rsp

	# Write third record
	pushq ST_FILE_DESCRIPTOR(%rbp)
	pushq $record3
	call write_record
	addq $16, %rsp

	# Close FD
	movq $SYS_CLOSE, %rax
	movq ST_FILE_DESCRIPTOR(%rbp), %rdi
	syscall

	# We are done, just exit
	movq $SYS_EXIT, %rax
	movq $0, %rdi
	syscall