user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<_conf_value>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  movq   $0x0,-0x8(%rbp)
  movl   $0x0,-0x1c(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  je     L284
  cmpq   $0x0,-0x30(%rbp)
  jne    L31
L284:
  mov    $0x0,%eax
  jmp    L110
L31:
  mov    -0x30(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,-0x10(%rbp)
  jmp    L205
L107:
  addl   $0x1,-0x1c(%rbp)
L205:
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x20,%al
  je     L107
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x9,%al
  je     L107
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0xa,%al
  je     L107
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L211
  mov    $0x0,%eax
  jmp    L110
L211:
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x10(%rbp),%edx
  mov    -0x30(%rbp),%rax
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <strncmp@plt>
  test   %rax,%rax
  jne    L272
  mov    -0x1c(%rbp),%edx
  mov    -0x10(%rbp),%eax
  add    %edx,%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x20,%al
  je     L339
  mov    -0x1c(%rbp),%edx
  mov    -0x10(%rbp),%eax
  add    %edx,%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x9,%al
  je     L339
  mov    -0x1c(%rbp),%edx
  mov    -0x10(%rbp),%eax
  add    %edx,%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x3d,%al
  jne    L272
L339:
  mov    -0x1c(%rbp),%edx
  mov    -0x10(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x18(%rbp)
  jmp    L304
L315:
  addl   $0x1,-0x18(%rbp)
L304:
  mov    -0x18(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x20,%al
  je     L315
  mov    -0x18(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x9,%al
  je     L315
  mov    -0x18(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x3d,%al
  jne    L141
L82:
  addl   $0x1,-0x18(%rbp)
  mov    -0x18(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x20,%al
  je     L82
  mov    -0x18(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x9,%al
  je     L82
L141:
  mov    -0x18(%rbp),%eax
  mov    %eax,-0x14(%rbp)
  jmp    L39
L210:
  addl   $0x1,-0x14(%rbp)
L39:
  mov    -0x14(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0xa,%al
  je     L138
  mov    -0x14(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  je     L138
  mov    -0x14(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x23,%al
  jne    L210
L138:
  subl   $0x1,-0x14(%rbp)
  mov    -0x14(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x20,%al
  je     L138
  mov    -0x14(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x9,%al
  je     L138
  mov    -0x14(%rbp),%eax
  sub    -0x18(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0xc(%rbp)
  cmpl   $0x0,-0xc(%rbp)
  jle    L175
  mov    -0xc(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,%esi
  mov    $0x1,%edi
  call   <calloc@plt>
  mov    %rax,-0x8(%rbp)
  cmpq   $0x0,-0x8(%rbp)
  jne    L42
  mov    $0x0,%eax
  jmp    L110
L42:
  mov    -0x18(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0xc(%rbp),%edx
  mov    -0x8(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strncpy@plt>
  jmp    L296
L175:
  mov    -0x14(%rbp),%eax
  mov    %eax,-0x1c(%rbp)
  jmp    L272
L162:
  addl   $0x1,-0x1c(%rbp)
L272:
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0xa,%al
  je     L206
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L162
L206:
  cmpq   $0x0,-0x8(%rbp)
  jne    L296
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L205
L296:
  mov    -0x8(%rbp),%rax
L110:
  leave
  ret
```

assistant: ```c
char *_conf_value(const char *buf, const char *option) {
  char *value = NULL;
  int optlen, pos = 0, pos2, pos3, len;
  if (buf == NULL || option == NULL)
    return NULL;
  optlen = strlen(option);
  do {
    while (buf[pos] == ' ' || buf[pos] == '\t' || buf[pos] == '\n')
      pos++;
    if (buf[pos] == '\0')
      return NULL;
    if (strncmp(&(buf[pos]), option, optlen) == 0 && (buf[pos + optlen] == ' ' || buf[pos + optlen] == '\t' || buf[pos + optlen] == '=')) {
      pos2 = pos + optlen;
      while (buf[pos2] == ' ' || buf[pos2] == '\t')
        pos2++;
      if (buf[pos2] == '=') {
        do {
          pos2++;
        } while (buf[pos2] == ' ' || buf[pos2] == '\t');
      }
      pos3 = pos2;
      while (buf[pos3] != '\n' && buf[pos3] != '\0' && buf[pos3] != '#')
        pos3++;
      do {
        pos3--;
      } while (buf[pos3] == ' ' || buf[pos3] == '\t');
      if ((len = pos3 - pos2 + 1) > 0) {
        if ((value = (char *)calloc(1, len + 1)) == NULL)
          return NULL;
        strncpy(value, &(buf[pos2]), len);
        break;
      }
      pos = pos3;
    }
    while (buf[pos] != '\n' && buf[pos] != '\0')
      pos++;
  } while (value == NULL && buf[pos] != '\0');
  return value;
}
```