user: 这段汇编代码用C语言表示是什么样的：

```asm
<openvpn_envp_to_json>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  mov    %rdi,%r13
  test   %rdi,%rdi
  je     L44
  mov    %rsi,%r14
  mov    (%rdi),%rdi
  test   %rdi,%rdi
  je     L57
  lea    0x8(%r13),%rbx
  mov    $0x0,%ebp
L100:
  call   <strlen@plt>
  lea    0xf(%rbp,%rax,1),%rbp
  add    $0x8,%rbx
  mov    -0x8(%rbx),%rdi
  test   %rdi,%rdi
  jne    L100
L16:
  mov    %ebp,%edi
  call   <malloc@plt>
  mov    %rax,%r12
  mov    %rbp,%rdx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
  movb   $0x7b,(%r12)
  mov    0x0(%r13),%rdi
  mov    $0x1,%ebp
  test   %rdi,%rdi
  jne    L124
L17:
  movb   $0x7d,(%r12,%rbp,1)
L36:
  mov    %r12,%rax
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L57:
  mov    $0x0,%ebp
  jmp    L16
L54:
  lea    0x1(%rdi,%rbx,1),%r15
  mov    %r14,%rdx
  mov    %rbx,%rsi
  call   <is_in_list@plt>
  test   %rax,%rax
  jne    L81
  cmp    $0x1,%rbp
  je     L62
  movb   $0x2c,(%r12,%rbp,1)
  movb   $0x20,0x1(%r12,%rbp,1)
  add    $0x2,%rbp
L62:
  movb   $0x22,(%r12,%rbp,1)
  add    $0x1,%rbp
  lea    (%r12,%rbp,1),%rdi
  mov    %rbx,%rdx
  mov    0x0(%r13),%rsi
  call   <memcpy@plt>
  add    %rbx,%rbp
  movb   $0x22,(%r12,%rbp,1)
  movb   $0x3a,0x1(%r12,%rbp,1)
  movb   $0x22,0x2(%r12,%rbp,1)
  add    $0x3,%rbp
  mov    %r15,%rdi
  call   <strlen@plt>
  mov    %rax,%rdx
  lea    (%r12,%rbp,1),%rdi
  mov    %r15,%rsi
  call   <memcpy@plt>
  mov    %r15,%rdi
  call   <strlen@plt>
  add    %rbp,%rax
  movb   $0x22,(%r12,%rax,1)
  lea    0x1(%rax),%rbp
L81:
  add    $0x8,%r13
  mov    0x0(%r13),%rdi
  test   %rdi,%rdi
  je     L17
L124:
  movzbl (%rdi),%eax
  mov    $0x0,%ebx
  test   %al,%al
  je     L81
L129:
  cmp    $0x3d,%al
  je     L54
  add    $0x1,%rbx
  movzbl (%rdi,%rbx,1),%eax
  test   %al,%al
  jne    L129
  jmp    L81
L44:
  mov    %rdi,%r12
  jmp    L36
```

assistant: ```c
char *openvpn_envp_to_json(const char *envp[], const char *exclude[]) {
  size_t i, j;
  size_t buffer_size = 0;
  size_t buffer_pos = 0;
  const size_t str_space = 15;
  char *json_str;
  const char *value_pos;
  if (!envp)
    return NULL;
  for (i = 0; envp[i]; i++)
    buffer_size += strlen(envp[i]) + str_space;
  json_str = (char *)malloc(sizeof(char) * buffer_size);
  memset(json_str, 0, buffer_size);
  json_str[buffer_pos] = '{';
  buffer_pos++;
  for (i = 0; envp[i]; i++) {
    value_pos = NULL;
    for (j = 0; envp[i][j]; j++) {
      if (envp[i][j] == '=') {
        value_pos = envp[i] + j + 1;
        break;
      }
    }
    if (!value_pos)
      continue;
    if (is_in_list(envp[i], j, exclude))
      continue;
    if (buffer_pos != 1) {
      json_str[buffer_pos] = ',';
      buffer_pos++;
      json_str[buffer_pos] = ' ';
      buffer_pos++;
    }
    json_str[buffer_pos] = '\"';
    buffer_pos++;
    memcpy(json_str + buffer_pos, envp[i], j);
    buffer_pos += j;
    json_str[buffer_pos] = '\"';
    buffer_pos++;
    json_str[buffer_pos] = ':';
    buffer_pos++;
    json_str[buffer_pos] = '\"';
    buffer_pos++;
    memcpy(json_str + buffer_pos, value_pos, strlen(value_pos));
    buffer_pos += strlen(value_pos);
    json_str[buffer_pos] = '\"';
    buffer_pos++;
  }
  json_str[buffer_pos] = '}';
  buffer_pos++;
  return json_str;
}
```