Url Parsing in Assembly Language

section .data
    url db "postgres://user:pass@host.com:5432/path?k=v#f", 0
    scheme_msg db "Scheme: ", 0
    user_msg db "User: ", 0
    host_msg db "Host: ", 0
    port_msg db "Port: ", 0
    path_msg db "Path: ", 0
    fragment_msg db "Fragment: ", 0
    query_msg db "Query: ", 0

section .bss
    scheme resb 16
    user resb 16
    host resb 64
    port resb 8
    path resb 64
    fragment resb 16
    query resb 64

section .text
    global _start

_start:
    ; Parse URL
    mov esi, url
    call parse_url

    ; Print results
    mov esi, scheme_msg
    call print_string
    mov esi, scheme
    call print_string
    call print_newline

    mov esi, user_msg
    call print_string
    mov esi, user
    call print_string
    call print_newline

    mov esi, host_msg
    call print_string
    mov esi, host
    call print_string
    call print_newline

    mov esi, port_msg
    call print_string
    mov esi, port
    call print_string
    call print_newline

    mov esi, path_msg
    call print_string
    mov esi, path
    call print_string
    call print_newline

    mov esi, fragment_msg
    call print_string
    mov esi, fragment
    call print_string
    call print_newline

    mov esi, query_msg
    call print_string
    mov esi, query
    call print_string
    call print_newline

    ; Exit program
    mov eax, 1
    xor ebx, ebx
    int 0x80

parse_url:
    ; This is a simplified URL parsing function
    ; It doesn't handle all cases and error checking
    push esi

    ; Parse scheme
    mov edi, scheme
    call parse_until_colon
    add esi, 3  ; Skip "://"

    ; Parse user
    mov edi, user
    call parse_until_at

    ; Parse host
    mov edi, host
    call parse_until_colon_or_slash

    ; Parse port
    cmp byte [esi], ':'
    jne .no_port
    inc esi
    mov edi, port
    call parse_until_slash
.no_port:

    ; Parse path
    mov edi, path
    call parse_until_question_or_hash

    ; Parse query
    cmp byte [esi], '?'
    jne .no_query
    inc esi
    mov edi, query
    call parse_until_hash
.no_query:

    ; Parse fragment
    cmp byte [esi], '#'
    jne .no_fragment
    inc esi
    mov edi, fragment
    call parse_until_end
.no_fragment:

    pop esi
    ret

parse_until_colon:
    lodsb
    cmp al, ':'
    je .done
    stosb
    jmp parse_until_colon
.done:
    ret

parse_until_at:
    lodsb
    cmp al, '@'
    je .done
    stosb
    jmp parse_until_at
.done:
    ret

parse_until_colon_or_slash:
    lodsb
    cmp al, ':'
    je .done
    cmp al, '/'
    je .done
    stosb
    jmp parse_until_colon_or_slash
.done:
    dec esi
    ret

parse_until_slash:
    lodsb
    cmp al, '/'
    je .done
    stosb
    jmp parse_until_slash
.done:
    dec esi
    ret

parse_until_question_or_hash:
    lodsb
    cmp al, '?'
    je .done
    cmp al, '#'
    je .done
    stosb
    jmp parse_until_question_or_hash
.done:
    dec esi
    ret

parse_until_hash:
    lodsb
    cmp al, '#'
    je .done
    stosb
    jmp parse_until_hash
.done:
    dec esi
    ret

parse_until_end:
    lodsb
    test al, al
    jz .done
    stosb
    jmp parse_until_end
.done:
    ret

print_string:
    push esi
    mov edx, 0
.count:
    lodsb
    test al, al
    jz .print
    inc edx
    jmp .count
.print:
    pop esi
    mov eax, 4
    mov ebx, 1
    int 0x80
    ret

print_newline:
    push esi
    mov esi, newline
    call print_string
    pop esi
    ret

section .data
    newline db 10, 0

This Assembly Language program demonstrates URL parsing. It takes a hardcoded URL and parses it into its components: scheme, user, host, port, path, fragment, and query.

The program uses several helper functions to parse different parts of the URL. It’s important to note that this is a simplified implementation and doesn’t handle all possible URL formats or error cases.

To run this program:

Save the code in a file, for example, url_parsing.asm.
Assemble the code using NASM:
```
nasm -f elf url_parsing.asm
```

Link the object file:

ld -m elf_i386 url_parsing.o -o url_parsing

Run the program:
```
./url_parsing
```

The output will display the different components of the parsed URL.

Note that Assembly Language doesn’t have built-in functions for URL parsing like higher-level languages do. This implementation is a basic example and would need to be expanded for more robust URL parsing capabilities.

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Url Parsing in Assembly Language