#  char S1[] = "This is a string."
#  int Foo[4];
#  char S2[100];
#
#  void main()
#  {
#    strcpy(S2, S1);
#  }
#
#  void strcpy(char* dst, char* src)
#  {
#    int i = 0;
#    while((dst[i] = src[i]) != 0)
#      i = i+1;
#  }
	
	.data
S1:	.ascii	"This is a string."	# this will be the source string
	.space 1			# this is the NULL at the end of the above string
	.align 4
Foo:	.space 16			# this is  just hear to leave some obvious space
S2:	.space	100			# desitination string

	.text
	.globl main
main:
	addi	$sp, $sp, -4	# get space on the stack
	sw	$ra, 0($sp)	# save main's return address
	la	$a0, S2		# get the address of S2 in the first argument
	la	$a1, S1		# get the address of S1 in the second argument
	jal	strcpy		# call strcpy
	lw	$ra, 0($sp)	# restore main's return address
	addi	$sp, $sp, 4	# restore the stack pointer
	jr	$ra		# exit main

	
strcpy:
	move	$t0,$zero	# i in $t0 = 0
L1:	add	$t1,$a1,$t0	# address of src[i] in $t1
	lb	$t2, 0($t1)	# t2 = src[i]
	add	$t1,$a0,$t0	# address of dst[i] in $t1
	sb	$t2, 0($t1)	# dst[i] = $t2
	addi	$t0, $t0, 1	# i = i+1
	bne	$t2,$zero,L1	# if dst[i] != 0 repeat

	jr	$ra		# return