#i386 code for upper(char* str) convert string to upper case
.globl	upper
upper:
	movl	4(%esp), %ebx		#string pointer from stack
	xorl	%eax, %eax		#count=0 (customary trick to zero a register)
uloop:
	movb	(%ebx), %ch		# while (next Char)
	cmpb	$0, %ch
	jz	udone
	    cmpb    $'a', %ch		# if char >= 'a'
	    jl	    endif
		andb	$0xdf, %ch	# zero case bit
		movb	%ch, (%ebx)
endif:
	    incl    %ebx		# str++
	    incl    %eax		#count++

	jmp	uloop
udone:
	ret				# count is in eax