Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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**Step 1**: The following code copies a string from source to target:

```assembly
.data
    source  BYTE "This is the source string",0
    target  BYTE SIZEOF source DUP(0)
.code
    mov esi,0                 ; index register
    mov ecx,SIZEOF source     ; loop counter
L1: 
    mov al,source[esi]        ; get char from source
    mov target[esi],al        ; store it in the target
    inc esi                   ; move to next character
    loop L1                   ; repeat for entire string

    mov edx, OFFSET source
    call WriteString
    mov edx, OFFSET target
    call WriteString
```

**Explanation**: 
- The code initializes a `source` string and a `target` location to store the copied string.
- The `esi` register is used as an index to iterate through each character of the `source`.
- For each iteration, the current character from `source` is stored in the `target`.
- A loop (`L1`) ensures this operation continues until the entire string is copied.
- After copying, a subroutine `WriteString` is called to output both `source` and `target`.

**Task**: Rewrite the program using indirect addressing rather than indexed addressing.
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Transcribed Image Text:**Step 1**: The following code copies a string from source to target: ```assembly .data source BYTE "This is the source string",0 target BYTE SIZEOF source DUP(0) .code mov esi,0 ; index register mov ecx,SIZEOF source ; loop counter L1: mov al,source[esi] ; get char from source mov target[esi],al ; store it in the target inc esi ; move to next character loop L1 ; repeat for entire string mov edx, OFFSET source call WriteString mov edx, OFFSET target call WriteString ``` **Explanation**: - The code initializes a `source` string and a `target` location to store the copied string. - The `esi` register is used as an index to iterate through each character of the `source`. - For each iteration, the current character from `source` is stored in the `target`. - A loop (`L1`) ensures this operation continues until the entire string is copied. - After copying, a subroutine `WriteString` is called to output both `source` and `target`. **Task**: Rewrite the program using indirect addressing rather than indexed addressing.
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