UMBC CMSC313

Project 2 Due: 12 Mar

6 Mar Update

The info on the open call is not as advertised! 
%define	BUFSIZE	0X0F6000	      	; This is 1,000,000 rounded up to the nearest
				 	; multiple of 8192 which is the most efficient								; read size.

section .data
mode	dd	0
flags	dd	0
path	db	'out',0
openMsg db	'Open error', 10, 0
bufsize dd	BUFSIZE

section .bss
fd	resd	1
buf	resb	BUFSIZE	

section .text
    global main                       ;must be declared for linker (ld)
extern	printf
main:                                 ;tell linker entry point

;; put your code here
	
open:
	mov	ebx, path
	mov	ecx, flags
	mov	edx, mode
	mov	eax, 5
	int	80h
	mov	[ fd ], eax
	cmp	eax, 0
	jg	read
	
	push	openMsg
	call	printf
	add	esp, 4
	jmp	quit

read:

quit:
        mov     ebx,0   ;successful termination of program
        mov     eax,1   ;system call number (sys_exit)
        int     0x80    ;call kernel

Requirements Specfication

Create the source file 6789prj2.asm, assembly it, link it, and run it. When it runs correctly, submit using Blackboard. (Remember that the 6789 is suppose to be the last four digits of your SSN, so that there is a unique file! Do not use 6789 unless that is in YOUR SSN!!)

This program will use subprogram, arrays, and system calls. You will have to open a file (which can have up to 1,000,000 bytes). This file can be any time of a file, text, binary, code, whatever. Then you will output 16 bytes per line where the first item on the line will be the offset into the file, followed by a colon. Then will come 16 bytes in hexadecimal characters, each one followed by a space. The will come a space, two colons and another space. Finally, display the ASCII character, if there is one. If not, display a period instead. For this project, that means if the byte is less than 32 or greater than 126, print the period. The program must terminate on a new line. Additionally, make the hex letters upcase.

You must design your program in such a way that it has at least two subprograms. Obviously, you will need an array of 1,000,000 bytes to use as a buffer. You must also use at least three system calls to make this work.

You must close the file as soon as possible. Good programming style dicates that files should only be opened the shortest amount of time possible.

Sample Output

Your program must output the results in the following manner (This is not the complete file): 

[~/courses/umbc/CMSC313/spring04/proj2/C]$ proj2

Enter the name of the file to view: 313.txt
00000000: 48 65 72 65 20 69 73 20 74 68 65 20 66 69 72 73  :: Here.is.the.firs
00000010: 74 20 74 72 79 20 61 74 20 74 68 65 20 73 65 63  :: t.try.at.the.sec
00000020: 6F 6E 64 20 70 61 72 74 3A 0A 20 0A 23 31 35 20  :: ond.part:...#15.
00000030: 20 43 6F 6D 62 69 6E 61 74 69 6F 6E 61 6C 20 4C  :: .Combinational.L
00000040: 6F 67 69 63 20 43 69 72 63 75 69 74 73 20 20 20  :: ogic.Circuits...
00000050: 20 20 20 4D 61 6E 6F 20 43 68 61 70 20 32 0A 20  :: ...Mano.Chap.2..
00000060: 0A 23 31 36 20 20 28 43 6F 6E 74 69 6E 75 65 64  :: .#16..(Continued
00000070: 29 0A 20 0A 23 31 37 20 20 43 6F 6D 62 69 6E 61  :: )...#17..Combina
00000080: 74 69 6F 6E 61 6C 20 4C 6F 67 69 63 20 44 65 73  :: tional.Logic.Des
00000090: 69 67 6E 20 20 20 20 20 20 4D 61 6E 6F 20 43 68  :: ign......Mano.Ch
000000A0: 61 70 20 33 0A 20 0A 23 31 38 20 20 41 72 69 74  :: ap.3...#18..Arit
000000B0: 68 6D 65 74 69 63 20 46 75 6E 63 74 69 6F 6E 73  :: hmetic.Functions
000000C0: 20 61 6E 64 20 43 69 72 63 75 69 74 73 20 20 4D  :: .and.Circuits..M
000000D0: 61 6E 6F 20 43 68 61 70 20 34 2C 20 43 68 61 70  :: ano.Chap.4,.Chap
000000E0: 20 35 20 20 20 20 48 6F 6D 65 77 6F 72 6B 20 31  :: .5....Homework.1
000000F0: 20 64 75 65 0A 20 0A 23 31 39 20 20 20 28 43 6F  :: .due...#19...(Co
00000100: 6E 74 69 6E 75 65 64 29 0A 20 0A 23 32 30 20 20  :: ntinued)...#20..

Program Header Comment Block

Use the following comment block at the beginning of your source code: 
;; Filename:       6789prj2.asm
;; Name:           Ima Student
;; SSAN:           6789  
;; Date:           28 Feb 2004
;; Course:         CMSC313 
;; Description:    (Your psuedocode goes here.  Must be detailed)
;; Notes:          (As needed, such has how to compile)