I need to read string from a keyboard with a buffer.
With some help of examples and literature, I managed to write this code, but when I try to print out the string that I've inserted, it just gives me message "Input your string again:".
What should I change in my code, in order to get printed what I've inserted?
.model small
stack 100h
.data
;reading buffer
buffSize DB 255 ;Number of maximum characters than can be read
read DB ? ;Number of characters that was read
buffer DB 255 dup (?) ;Read characters are placed here
;Other data
input DB "Input your string: $",13,10
.code
Start:
MOV ax,@data
MOV ds,ax
MOV ah,9
MOV dx, OFFSET input
INT 21h ;Prints input string
MOV ah, 0Ah
MOV dx, OFFSET buffSize
INT 21h ;Text is read
MOV bx, OFFSET buffer ;Address of buffer is inserted to bx
MOV cl, read ;Content of read is inserted to cl
MOV ch, 0 ;In cl there is a number of inserted characters
MOV byte ptr [ds:bx], '$'
MOV ah, 9
MOV dx, OFFSET buffer
INT 21h
MOV ah,4Ch
INT 21h
END Start
input DB "Input your string: " nextLine db "$",13,10
The nextLine won't do much. Put the "$" behind the 13,10.
Best also delimit the input text on the same line.
input db "Input your string: $"
nextLine db 13,10,"$"
buffSize DB 255 ;Number of maximum characters than can be read read DB ? ;Number of characters that was read buffer DB 25 dup (?) ;Read characters are placed here
If you allow for an input of 255 characters, you should also define a buffer large enough! 25 dup (?) is much smaller than the stated size of 255.
To re-print the input, put a $ behind the text:
mov bx, OFFSET buffer ;Start of the text
add bl, read ; plus the number of characters in the text
adc bh, 0 ;Maybe there was a carry from previous addition!
mov byte ptr [bx], "$" ;DOS needs string $-terminated
mov ah, 09h ;DOS.DisplayString
mov dx, OFFSET buffer
int 21h