user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<str2xterm>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x38(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  mov    -0x38(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x23,%al
  jne    L217
  addq   $0x1,-0x18(%rbp)
  lea    -0x20(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  mov    $0x10,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strtol@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x20(%rbp),%rax
  cmp    %rax,-0x18(%rbp)
  jne    L12
  mov    $0xffffffff,%eax
  jmp    L43
L12:
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <rgb2xterm@plt>
  jmp    L43
L217:
  lea    -0x20(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  mov    $0xa,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strtol@plt>
  mov    %eax,-0x2c(%rbp)
  mov    -0x20(%rbp),%rax
  cmp    %rax,-0x18(%rbp)
  jne    L66
  mov    $0xffffffff,%eax
  jmp    L43
L66:
  mov    -0x20(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L3
  cmpl   $0xff,-0x2c(%rbp)
  jg     L157
  mov    -0x2c(%rbp),%eax
  jmp    L43
L157:
  mov    -0x2c(%rbp),%eax
  cltq
  mov    %rax,%rdi
  call   <rgb2xterm@plt>
  jmp    L43
L3:
  mov    -0x20(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  jmp    L184
L128:
  addq   $0x1,-0x18(%rbp)
L184:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %eax,%eax
  jne    L211
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L128
L211:
  lea    -0x20(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  mov    $0xa,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strtol@plt>
  mov    %eax,-0x28(%rbp)
  mov    -0x20(%rbp),%rax
  cmp    %rax,-0x18(%rbp)
  je     L207
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L180
L207:
  mov    $0xffffffff,%eax
  jmp    L43
L180:
  mov    -0x20(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  jmp    L51
L144:
  addq   $0x1,-0x18(%rbp)
L51:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %eax,%eax
  jne    L110
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L144
L110:
  lea    -0x20(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  mov    $0xa,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strtol@plt>
  mov    %eax,-0x24(%rbp)
  mov    -0x20(%rbp),%rax
  cmp    %rax,-0x18(%rbp)
  je     L98
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L200
L98:
  mov    $0xffffffff,%eax
  jmp    L43
L200:
  mov    -0x2c(%rbp),%eax
  shl    $0x10,%eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%eax
  shl    $0x8,%eax
  add    %eax,%edx
  mov    -0x24(%rbp),%eax
  add    %edx,%eax
  cltq
  mov    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <rgb2xterm@plt>
L43:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L118
  call   <__stack_chk_fail@plt>
L118:
  leave
  ret
```

assistant: ```c
int str2xterm(char *str) {
  long rgb;
  int xterm, r, g, b;
  char *p, *t;
  p = str;
  if (*p == '#') {
    p++;
    rgb = strtol(p, &t, 16);
    if (p == t) {
      return (-1);
    } else {
      return (rgb2xterm(rgb));
    }
  } else {
    r = strtol(p, &t, 10);
    if (p == t) {
      return (-1);
    } else if (*t == 0) {
      if (r < 256)
        return (r);
      return (rgb2xterm(r));
    } else {
      p = t;
      while (!isdigit(*p) && (*p != 0)) {
        p++;
      }
      g = strtol(p, &t, 10);
      if ((p == t) || (*p == 0)) {
        return (-1);
      }
      p = t;
      while (!isdigit(*p) && (*p != 0)) {
        p++;
      }
      b = strtol(p, &t, 10);
      if ((p == t) || (*p == 0)) {
        return (-1);
      }
      rgb = (r << 16) + (g << 8) + b;
      return (rgb2xterm(rgb));
    }
  }
  return (-1);
}
```