user: Demonstrate the C code that generates the assembly output below:

```asm
<parse_tftp_url>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    %rcx,-0x40(%rbp)
  movl   $0x1,-0x14(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  je     L50
  mov    -0x28(%rbp),%rax
  mov    $0x7,%edx
  lea    D3(%rip),%rcx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strncasecmp@plt>
  test   %rax,%rax
  jne    L50
  mov    -0x28(%rbp),%rax
  add    $0x7,%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x40(%rbp),%rax
  movl   $0x0,(%rax)
  mov    -0x10(%rbp),%rax
  mov    $0x3a,%esi
  mov    %rax,%rdi
  call   <strchr@plt>
  mov    %rax,-0x8(%rbp)
  cmpq   $0x0,-0x8(%rbp)
  je     L65
  mov    -0x40(%rbp),%rax
  movl   $0x10000,(%rax)
  jmp    L173
L65:
  mov    -0x10(%rbp),%rax
  mov    $0x2f,%esi
  mov    %rax,%rdi
  call   <strchr@plt>
  mov    %rax,-0x8(%rbp)
L173:
  cmpq   $0x0,-0x8(%rbp)
  jne    L34
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  movslq %eax,%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x8(%rbp)
  movl   $0x0,-0x14(%rbp)
L34:
  mov    -0x8(%rbp),%rax
  movb   $0x0,(%rax)
  mov    -0x30(%rbp),%rax
  mov    -0x10(%rbp),%rdx
  mov    %rdx,(%rax)
  mov    -0x30(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,%rdi
  call   <isvalhostname@plt>
  test   %eax,%eax
  je     L129
  mov    -0x14(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x40(%rbp),%rax
  mov    (%rax),%eax
  test   %eax,%eax
  je     L186
  mov    -0x10(%rbp),%rax
  mov    $0x2f,%esi
  mov    %rax,%rdi
  call   <strchr@plt>
  mov    %rax,-0x8(%rbp)
  cmpq   $0x0,-0x8(%rbp)
  jne    L7
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  movslq %eax,%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x8(%rbp)
  movl   $0x0,-0x14(%rbp)
L7:
  mov    -0x8(%rbp),%rax
  movb   $0x0,(%rax)
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <isport@plt>
  mov    -0x40(%rbp),%rdx
  mov    %eax,(%rdx)
  mov    -0x40(%rbp),%rax
  mov    (%rax),%eax
  test   %eax,%eax
  je     L18
  mov    -0x14(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x10(%rbp)
  jmp    L153
L186:
  mov    -0x40(%rbp),%rax
  movl   $0x45,(%rax)
L153:
  mov    -0x38(%rbp),%rax
  mov    -0x10(%rbp),%rdx
  mov    %rdx,(%rax)
  mov    -0x38(%rbp),%rax
  mov    (%rax),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L140
  mov    $0x1,%eax
  jmp    L92
L140:
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <isvalpath@plt>
  mov    %eax,-0x14(%rbp)
  cmpl   $0x0,-0x14(%rbp)
  je     L170
  mov    -0x14(%rbp),%eax
  cltq
  lea    -0x1(%rax),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x2f,%al
  jne    L158
  mov    $0x1,%eax
  jmp    L92
L158:
  mov    $0x2,%eax
  jmp    L92
L50:
  nop
  jmp    L180
L129:
  nop
  jmp    L180
L18:
  nop
  jmp    L180
L170:
  nop
L180:
  mov    -0x30(%rbp),%rax
  movq   $0x0,(%rax)
  mov    -0x38(%rbp),%rax
  movq   $0x0,(%rax)
  mov    -0x40(%rbp),%rax
  movl   $0x0,(%rax)
  mov    $0xffffffff,%eax
L92:
  leave
  ret
```

tool_calls: name: extract_symbolic_data
arguments: data_tag: D3
data_type: string

tool: D3: tftp://

assistant: ```c
int parse_tftp_url(char *url, char **host, char **path, int *port) {
  char *pos, *end;
  int l = 1;
  if (url == NULL || strncasecmp(url, "tftp://", 7) != 0)
    goto fail;
  pos = url + 7;
  *port = 0;
  end = strchr(pos, ':');
  if (end != NULL)
    *port = 0x010000;
  else
    end = strchr(pos, '/');
  if (end == NULL) {
    end = pos + strlen(pos);
    l = 0;
  }
  *end = '\0';
  *host = pos;
  if (!isvalhostname(*host))
    goto fail;
  pos = end + l;
  if (*port) {
    end = strchr(pos, '/');
    if (end == NULL) {
      end = pos + strlen(pos);
      l = 0;
    }
    *end = '\0';
    *port = isport(pos);
    if (*port == 0)
      goto fail;
    pos = end + l;
  } else
    *port = 69;
  *path = pos;
  if (!**path)
    return 1;
  l = isvalpath(pos);
  if (!l)
    goto fail;
  if (pos[l - 1] == '/')
    return 1;
  return 2;
fail:
  *host = NULL;
  *path = NULL;
  *port = 0;
  return -1;
}
```