user: 请从给定的汇编指令推导出C源代码:

```asm
<squirrel_http>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  mov    %rdx,-0x28(%rbp)
  mov    %ecx,-0x2c(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  cmpl   $0x5,-0x2c(%rbp)
  jbe    L173
  mov    -0x28(%rbp),%rax
  mov    $0x4,%edx
  lea    D13(%rip),%rcx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcmp@plt>
  test   %rax,%rax
  je     L173
  mov    -0x28(%rbp),%rax
  mov    $0x5,%edx
  lea    D1(%rip),%rcx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcmp@plt>
  test   %rax,%rax
  jne    L189
L173:
  lea    -0x10(%rbp),%rdx
  mov    -0x2c(%rbp),%esi
  mov    -0x28(%rbp),%rax
  mov    %rdx,%rcx
  lea    D26(%rip),%rdx
  mov    %rax,%rdi
  call   <find_string@plt>
  test   %eax,%eax
  je     L49
  jmp    L187
L16:
  mov    -0x10(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x10(%rbp)
L187:
  mov    -0x10(%rbp),%eax
  cmp    %eax,-0x2c(%rbp)
  jbe    L40
  mov    -0x10(%rbp),%eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  mov    %eax,%edi
  call   <isspace@plt>
  test   %rax,%rax
  je     L40
  mov    -0x10(%rbp),%eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0xa,%al
  jne    L16
L40:
  mov    -0x10(%rbp),%eax
  mov    %eax,-0xc(%rbp)
  jmp    L51
L179:
  addl   $0x1,-0xc(%rbp)
L51:
  mov    -0xc(%rbp),%eax
  cmp    -0x2c(%rbp),%eax
  jae    L132
  mov    -0xc(%rbp),%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0xa,%al
  jne    L179
L132:
  mov    -0xc(%rbp),%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0xa,%al
  jne    L135
  jmp    L107
L71:
  subl   $0x1,-0xc(%rbp)
L107:
  mov    -0x10(%rbp),%eax
  cmp    %eax,-0xc(%rbp)
  jbe    L48
  mov    -0xc(%rbp),%eax
  sub    $0x1,%eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  mov    %eax,%edi
  call   <isspace@plt>
  test   %rax,%rax
  jne    L71
L48:
  mov    -0x10(%rbp),%edx
  mov    -0xc(%rbp),%eax
  sub    %edx,%eax
  mov    %eax,%ecx
  mov    -0x10(%rbp),%eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%rax
  add    %rax,%rdx
  mov    -0x20(%rbp),%rsi
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <squirrel_http_useragent@plt>
  jmp    L92
L189:
  nop
  jmp    L92
L49:
  nop
  jmp    L92
L135:
  nop
L92:
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L64
  call   <__stack_chk_fail@plt>
L64:
  leave
  ret
```

tool_calls: name: retrieve_data
arguments: data_label: D13
type_guessed: string
name: retrieve_data
arguments: data_label: D1
type_guessed: string
name: retrieve_data
arguments: data_label: D26
type_guessed: string

tool: D13: GET 

tool: D1: POST 

tool: D26: User-Agent:

assistant: ```c
void squirrel_http(struct Squirrel *squirrel, struct NetFrame *frame, const unsigned char *px, unsigned length) {
  unsigned u, n;
  if (length > 5) {
    if (memcmp(px, "GET ", 4) == 0 || memcmp(px, "POST ", 5) == 0)
      ;
    else
      return;
  }
  if (!find_string(px, length, "User-Agent:", &u))
    return;
  while (u < length && isspace(px[u]) && px[u] != '\n')
    u++;
  for (n = u; n < length && px[n] != '\n'; n++)
    ;
  if (px[n] != '\n')
    return;
  while (n > u && isspace(px[n - 1]))
    n--;
  squirrel_http_useragent(squirrel, frame, px + u, n - u);
}
```