5-3강 - Procedure 3 (Link Library)

3. Link Library

1) Link Library

Machine code로 assemble된 procedure를 포함하고 있는 파일

 

2) Link Library 목록

1> Clrscr - Clears the console and locates the cursor at the upper left corner.
2> Crlf - Writes an end of line sequence to standard output.
3> Delay - Pauses the program execution for a specified n millisecond interval.
4> DumpMem - Writes a block of memory to standard output in hexadecimal.

5> DumpRegs - Displays the EAX, EBX, ECX, EDX, ESI, EDI, EBP, ESP, EFLAGS, and EIP registers in hexadecimal. Also displays the Carry, Sign, Zero, and Overflow flags.
6> GetCommandtail - Copies the program’s command-line arguments (called the command tail) into an array of bytes. If empty, the Carry flag is set. Otherwise, reset.

7> GetMseconds - Returns the number of milliseconds that have elapsed since midnight.

8> Gotoxy - Locates cursor at row and column on the console.

9>  Random32 - Generates a 32-bit pseudorandom integer in the range 0 to FFFFFFFFh.
10> Randomize - Seeds the random number generator.
11> RandomRange - Generates a pseudorandom integer within a specified range.
12> ReadChar - Reads a single character from standard input.
13> ReadHex - Reads a 32-bit hexadecimal integer from standard input, terminated by the Enter key.
14> ReadInt - Reads a 32-bit signed decimal integer from standard input, terminated by the Enter key.
15> ReadString - Reads a string from standard input, terminated by the Enter key.

16> SetTextColor - Sets the foreground and background colors of all subsequent text output to the console.
17> WaitMsg - Displays message, waits for Enter key to be pressed.
18> WriteBin - Writes an unsigned 32-bit integer to standard output in ASCII binary format.
19> WriteChar - Writes a single character to standard output.
20> WriteDec - Writes an unsigned 32-bit integer to standard output in decimal format.
21> WriteHex - Writes an unsigned 32-bit integer to standard output in hexadecimal format.
22> WriteInt - Writes a signed 32-bit integer to standard output in decimal format.
23> WriteString - Writes a null-terminated string to standard output.

 

3) 예시

1> 예시 1

.code
	call Clrscr
	mov eax,500
	call Delay
	call DumpRegs

- Clear the screen, delay the program for 500 milliseconds, and dump the registers and flags.

 

2> 예시 2

.data
	str1 BYTE "Assembly language is easy!",0
.code
	mov edx,OFFSET str1
	call WriteString
	call Crlf

- Display a null-terminated string and move the cursor to the beginning of the next screen line.

(다른 구현)

.data
str1 BYTE "Assembly language is easy!",0Dh,0Ah,0
.code
	mov edx,OFFSET str1
	call WriteString

3> 예시 3

.data
fileName BYTE 80 DUP(0)
.code
	mov edx,OFFSET fileName
	mov ecx,SIZEOF fileName – 1 ; 0 is appended
	call ReadString

- Input a string from the user. EDX points to the string and ECX specifies the maximum number of characters  the user is permitted to enter.

 

4> 예시 4

.code
	mov ecx,10 		; loop counter
L1:	mov eax,100 		; ceiling value
	call RandomRange 	; generate random int
	call WriteInt 		; display signed int
	call Crlf 		; goto next display line
	loop L1  		; repeat loop

- Generate and display ten pseudorandom signed integers in the range 0 – 99. Pass each integer to WriteInt in  EAX and display it on a separate line.

 

5> 예시 5

.data
str1 BYTE "Color output is easy!",0
.code
	mov eax,yellow + (blue * 16)
	call SetTextColor
	mov edx,OFFSET str1
	call WriteString
	call Crlf

- Display a null-terminated string with yellow characters on a blue background.
- The background color is multiplied by 16 before being added to the foreground color.