user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<uuencode>:
  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)
  movq   $0x0,-0x20(%rbp)
  movq   $0x0,-0x18(%rbp)
  cmpq   $0x0,-0x40(%rbp)
  jne    L71
  mov    -0x38(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %rax,-0x40(%rbp)
L71:
  cmpq   $0x2,-0x30(%rbp)
  ja     L13
  mov    $0xffffffff,%eax
  jmp    L167
L13:
  subq   $0x3,-0x30(%rbp)
  jmp    L230
L198:
  movq   $0x2d,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  cmp    %rax,-0x40(%rbp)
  jae    L123
  mov    -0x40(%rbp),%rax
  sub    -0x20(%rbp),%rax
  mov    %rax,-0x8(%rbp)
L123:
  cmpq   $0x0,-0x8(%rbp)
  jne    L136
  movq   $0x60,-0x8(%rbp)
  jmp    L74
L136:
  addq   $0x20,-0x8(%rbp)
L74:
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  mov    -0x28(%rbp),%rdx
  add    %rdx,%rax
  mov    -0x8(%rbp),%rdx
  mov    %dl,(%rax)
  movq   $0x0,-0x10(%rbp)
  jmp    L142
L171:
  mov    -0x38(%rbp),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x28(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  sar    $0x2,%dl
  mov    %dl,(%rax)
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L137
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movb   $0x60,(%rax)
  jmp    L58
L137:
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  lea    0x20(%rax),%ecx
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    %ecx,%edx
  mov    %dl,(%rax)
L58:
  addq   $0x1,-0x18(%rbp)
  mov    -0x20(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x20(%rbp)
  mov    -0x38(%rbp),%rdx
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  shl    $0x4,%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  and    $0x30,%ecx
  mov    %ecx,%edx
  mov    %dl,(%rax)
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x38(%rbp),%rcx
  mov    -0x20(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  sar    $0x4,%al
  mov    %eax,%esi
  mov    -0x28(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  or     %esi,%edx
  mov    %dl,(%rax)
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L114
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movb   $0x60,(%rax)
  jmp    L67
L114:
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  lea    0x20(%rax),%ecx
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    %ecx,%edx
  mov    %dl,(%rax)
L67:
  addq   $0x1,-0x18(%rbp)
  mov    -0x20(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x20(%rbp)
  mov    -0x38(%rbp),%rdx
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  shl    $0x2,%eax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  and    $0x3c,%ecx
  mov    %ecx,%edx
  mov    %dl,(%rax)
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x38(%rbp),%rcx
  mov    -0x20(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  sar    $0x6,%al
  mov    %eax,%esi
  mov    -0x28(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  or     %esi,%edx
  mov    %dl,(%rax)
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L25
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movb   $0x60,(%rax)
  jmp    L210
L25:
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  lea    0x20(%rax),%ecx
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    %ecx,%edx
  mov    %dl,(%rax)
L210:
  addq   $0x1,-0x18(%rbp)
  mov    -0x20(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x20(%rbp)
  mov    -0x38(%rbp),%rdx
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x28(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  and    $0x3f,%edx
  mov    %dl,(%rax)
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L6
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movb   $0x60,(%rax)
  jmp    L26
L6:
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  lea    0x20(%rax),%ecx
  mov    -0x28(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    %ecx,%edx
  mov    %dl,(%rax)
L26:
  addq   $0x1,-0x18(%rbp)
  addq   $0x3,-0x10(%rbp)
L142:
  mov    -0x10(%rbp),%rax
  cmp    -0x8(%rbp),%rax
  jae    L56
  mov    -0x18(%rbp),%rax
  cmp    -0x30(%rbp),%rax
  jae    L56
  mov    -0x20(%rbp),%rax
  cmp    -0x40(%rbp),%rax
  jb     L171
L56:
  mov    -0x18(%rbp),%rax
  cmp    -0x30(%rbp),%rax
  jae    L176
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  mov    -0x28(%rbp),%rdx
  add    %rdx,%rax
  movb   $0xd,(%rax)
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  mov    -0x28(%rbp),%rdx
  add    %rdx,%rax
  movb   $0xa,(%rax)
L176:
  mov    -0x20(%rbp),%rax
  cmp    -0x40(%rbp),%rax
  jae    L156
L230:
  mov    -0x20(%rbp),%rax
  cmp    -0x40(%rbp),%rax
  ja     L138
  mov    -0x18(%rbp),%rax
  cmp    -0x30(%rbp),%rax
  jb     L198
  jmp    L138
L156:
  nop
L138:
  mov    -0x18(%rbp),%rax
  cmp    -0x30(%rbp),%rax
  jae    L80
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  mov    -0x28(%rbp),%rdx
  add    %rdx,%rax
  movb   $0x0,(%rax)
L80:
  mov    -0x18(%rbp),%rax
L167:
  leave
  ret
```

assistant: ```c
int uuencode(char *target, size_t tlen, const char *source, size_t slen) {
  size_t rd = 0;
  size_t wr = 0;
  size_t block;
  size_t len;
  if (slen == 0)
    slen = strlen(source);
  if (tlen < 3)
    return (-1);
  tlen -= 3;
  while (rd <= slen && wr < tlen) {
    len = 45;
    if (rd + len > slen)
      len = slen - rd;
    if ((len) == 0)
      (len) = '`';
    else
      (len) += ' ';
    ;
    target[wr++] = len;
    block = 0;
    while (block < len && wr < tlen && rd < slen) {
      target[wr] = source[rd] >> 2;
      if ((target[wr]) == 0)
        (target[wr]) = '`';
      else
        (target[wr]) += ' ';
      ;
      wr++;
      target[wr] = (source[rd++] & 0x03) << 4;
      target[wr] |= source[rd] >> 4;
      if ((target[wr]) == 0)
        (target[wr]) = '`';
      else
        (target[wr]) += ' ';
      ;
      wr++;
      target[wr] = (source[rd++] & 0x0f) << 2;
      target[wr] |= source[rd] >> 6;
      if ((target[wr]) == 0)
        (target[wr]) = '`';
      else
        (target[wr]) += ' ';
      ;
      wr++;
      target[wr] = source[rd++] & 0x3f;
      if ((target[wr]) == 0)
        (target[wr]) = '`';
      else
        (target[wr]) += ' ';
      ;
      wr++;
      block += 3;
    }
    if (wr < tlen) {
      target[wr++] = '\r';
      target[wr++] = '\n';
    }
    if (rd >= slen)
      break;
  }
  if (wr < tlen)
    target[wr++] = 0;
  return (wr);
}
```