user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<quoted_printable_decode>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  mov    %rdi,-0x20(%rbp)
  mov    %rsi,-0x28(%rbp)
  mov    -0x28(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,-0x10(%rbp)
  subq   $0x1,-0x18(%rbp)
  jmp    L208
L70:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x5f,%al
  jne    L36
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x10(%rbp)
  movb   $0x20,(%rax)
  jmp    L208
L36:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x3f,%al
  jne    L75
  addq   $0x1,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L3
  subq   $0x1,-0x18(%rbp)
  mov    -0x28(%rbp),%rax
  mov    -0x18(%rbp),%rdx
  mov    %rdx,(%rax)
  jmp    L119
L3:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x3d,%al
  jne    L75
  addq   $0x1,-0x18(%rbp)
  mov    -0x28(%rbp),%rax
  mov    -0x18(%rbp),%rdx
  mov    %rdx,(%rax)
  jmp    L119
L75:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x3d,%al
  jne    L337
  addq   $0x1,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%ebx
  test   %ebx,%ebx
  jne    L270
  subq   $0x1,-0x18(%rbp)
  jmp    L119
L270:
  mov    -0x18(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  test   %al,%al
  je     L51
  cmp    $0x2f,%ebx
  jle    L274
  cmp    $0x39,%ebx
  jg     L274
  mov    %ebx,%eax
  sub    $0x30,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  mov    %dl,(%rax)
  jmp    L261
L274:
  cmp    $0x40,%ebx
  jle    L419
  cmp    $0x46,%ebx
  jle    L246
L419:
  cmp    $0x60,%ebx
  jle    L147
  cmp    $0x66,%ebx
  jg     L147
L246:
  mov    %ebx,%eax
  cmp    $0x60,%ebx
  jle    L189
  mov    $0x61,%edx
  jmp    L376
L189:
  mov    $0x41,%edx
L376:
  sub    %edx,%eax
  add    $0xa,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  mov    %dl,(%rax)
  jmp    L261
L147:
  cmp    $0xa,%ebx
  je     L208
  cmp    $0xd,%ebx
  jne    L45
  jmp    L208
L45:
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x10(%rbp)
  movb   $0x3d,(%rax)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x10(%rbp)
  mov    %ebx,%edx
  mov    %dl,(%rax)
  jmp    L208
L261:
  mov    -0x10(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  shl    $0x4,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  mov    %dl,(%rax)
  addq   $0x1,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%ebx
  cmp    $0x2f,%ebx
  jle    L366
  cmp    $0x39,%ebx
  jg     L366
  mov    -0x10(%rbp),%rax
  movzbl (%rax),%eax
  mov    %eax,%edx
  mov    %ebx,%eax
  add    %edx,%eax
  sub    $0x30,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  mov    %dl,(%rax)
  jmp    L287
L366:
  cmp    $0x40,%ebx
  jle    L9
  cmp    $0x46,%ebx
  jle    L166
L9:
  cmp    $0x60,%ebx
  jle    L334
  cmp    $0x66,%ebx
  jg     L334
L166:
  mov    -0x10(%rbp),%rax
  movzbl (%rax),%eax
  mov    %eax,%ecx
  mov    %ebx,%eax
  cmp    $0x60,%ebx
  jle    L112
  mov    $0x61,%edx
  jmp    L227
L112:
  mov    $0x41,%edx
L227:
  sub    %edx,%eax
  add    %ecx,%eax
  add    $0xa,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  mov    %dl,(%rax)
  jmp    L287
L334:
  cmp    $0xa,%ebx
  je     L87
  cmp    $0xd,%ebx
  jne    L427
L87:
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x10(%rbp)
  mov    %ebx,%edx
  mov    %dl,(%rax)
  jmp    L208
L427:
  mov    -0x10(%rbp),%rax
  movb   $0x20,(%rax)
  jmp    L208
L287:
  addq   $0x1,-0x10(%rbp)
  jmp    L208
L337:
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x10(%rbp)
  mov    -0x18(%rbp),%rdx
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
L208:
  addq   $0x1,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L70
  jmp    L119
L51:
  nop
L119:
  mov    -0x20(%rbp),%rax
  mov    -0x10(%rbp),%rdx
  mov    %rdx,(%rax)
  nop
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
void quoted_printable_decode(char **dest, char **src) {
  char *buf = *src;
  char *s = *dest;
  register int n = 0;
  buf--;
  while (*++buf) {
    if (*buf == '_') {
      *s++ = ' ';
      continue;
    };
    if (*buf == '?') {
      buf++;
      if (!*buf) {
        *src = --buf;
        break;
      } else if (*buf == '=') {
        *src = ++buf;
        break;
      }
    }
    if (*buf == '=') {
      n = *++buf;
      if (!n) {
        buf--;
        break;
      }
      if (!*(buf + 1))
        break;
      if ((n >= '0') && (n <= '9'))
        *s = (n - '0');
      else if (((n >= 'A') && (n <= 'F')) || ((n >= 'a') && (n <= 'f')))
        *s = 10 + n - ((n >= 'a') ? 'a' : 'A');
      else {
        if (n == '\n' || n == '\r')
          continue;
        *s++ = '=';
        *s++ = n;
        continue;
      };
      *s <<= 4;
      n = *++buf;
      if ((n >= '0') && (n <= '9'))
        *s += (n - '0');
      else if (((n >= 'A') && (n <= 'F')) || ((n >= 'a') && (n <= 'f')))
        *s += 10 + n - ((n >= 'a') ? 'a' : 'A');
      else {
        if (n == '\n' || n == '\r') {
          *s++ = n;
          continue;
        };
        *s = ' ';
        continue;
      };
      s++;
      continue;
    };
    *s++ = *buf;
  }
  *dest = s;
}
```