user: 下面的汇编指令对应的C源代码是什么：

```asm
<unescapestr>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  add    $0x1,%rax
  mov    %rax,%rdi
  call   <wmalloc@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  mov    %rax,-0x10(%rbp)
L49:
  mov    -0x28(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x28(%rbp)
  movzbl (%rax),%eax
  mov    %al,-0x11(%rbp)
  cmpb   $0x0,-0x11(%rbp)
  je     L143
  cmpb   $0x5c,-0x11(%rbp)
  je     L48
  mov    -0x10(%rbp),%rax
  movzbl -0x11(%rbp),%edx
  mov    %dl,(%rax)
  jmp    L145
L48:
  mov    -0x28(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x28(%rbp)
  movzbl (%rax),%eax
  mov    %al,-0x11(%rbp)
  cmpb   $0x0,-0x11(%rbp)
  jne    L111
  mov    -0x10(%rbp),%rax
  movb   $0x5c,(%rax)
  jmp    L101
L111:
  cmpb   $0x2f,-0x11(%rbp)
  jle    L34
  cmpb   $0x37,-0x11(%rbp)
  jg     L34
  movzbl -0x11(%rbp),%eax
  and    $0x7,%eax
  mov    %al,-0x12(%rbp)
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  mov    %al,-0x11(%rbp)
  cmpb   $0x2f,-0x11(%rbp)
  jle    L79
  cmpb   $0x37,-0x11(%rbp)
  jg     L79
  addq   $0x1,-0x28(%rbp)
  movsbl -0x12(%rbp),%eax
  shl    $0x3,%eax
  mov    %eax,%edx
  movzbl -0x11(%rbp),%eax
  and    $0x7,%eax
  or     %edx,%eax
  mov    %al,-0x12(%rbp)
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  mov    %al,-0x11(%rbp)
  cmpb   $0x2f,-0x11(%rbp)
  jle    L79
  cmpb   $0x37,-0x11(%rbp)
  jg     L79
  addq   $0x1,-0x28(%rbp)
  movsbl -0x12(%rbp),%eax
  shl    $0x3,%eax
  mov    %eax,%edx
  movzbl -0x11(%rbp),%eax
  and    $0x7,%eax
  or     %edx,%eax
  mov    %al,-0x12(%rbp)
L79:
  mov    -0x10(%rbp),%rax
  movzbl -0x12(%rbp),%edx
  mov    %dl,(%rax)
  jmp    L145
L34:
  movsbl -0x11(%rbp),%eax
  sub    $0x61,%eax
  cmp    $0x15,%eax
  ja     L75
  mov    %eax,%eax
  lea    0x0(,%rax,4),%rdx
  lea    D12(%rip),%rax
  mov    (%rdx,%rax,1),%eax
  cltq
  lea    D12(%rip),%rdx
  add    %rdx,%rax
  notrack jmp *%rax
  mov    -0x10(%rbp),%rax
  movb   $0x7,(%rax)
  jmp    L145
  mov    -0x10(%rbp),%rax
  movb   $0x8,(%rax)
  jmp    L145
  mov    -0x10(%rbp),%rax
  movb   $0x9,(%rax)
  jmp    L145
  mov    -0x10(%rbp),%rax
  movb   $0xd,(%rax)
  jmp    L145
  mov    -0x10(%rbp),%rax
  movb   $0xa,(%rax)
  jmp    L145
  mov    -0x10(%rbp),%rax
  movb   $0xb,(%rax)
  jmp    L145
  mov    -0x10(%rbp),%rax
  movb   $0xc,(%rax)
  jmp    L145
L75:
  mov    -0x10(%rbp),%rax
  movzbl -0x11(%rbp),%edx
  mov    %dl,(%rax)
L145:
  addq   $0x1,-0x10(%rbp)
  jmp    L49
L143:
  nop
L101:
  mov    -0x10(%rbp),%rax
  movb   $0x0,(%rax)
  mov    -0x8(%rbp),%rax
  leave
  ret
```

assistant: ```c
char *unescapestr(const char *src) {
  char *dest = wmalloc(strlen(src) + 1);
  char *dPtr;
  char ch;
  for (dPtr = dest;; dPtr++) {
    ch = *src++;
    if (ch == '\0')
      break;
    else if (ch != '\\')
      *dPtr = ch;
    else {
      ch = *(src++);
      if (ch == '\0') {
        *dPtr = '\\';
        break;
      } else if ((ch >= '0') && (ch <= '7')) {
        char wch;
        wch = (ch & 07);
        ch = *src;
        if ((ch >= '0') && (ch <= '7')) {
          src++;
          wch = (wch << 3) | (ch & 07);
          ch = *src;
          if ((ch >= '0') && (ch <= '7')) {
            src++;
            wch = (wch << 3) | (ch & 07);
          }
        }
        *dPtr = wch;
      } else {
        switch (ch) {
        case 'a':
          *dPtr = '\a';
          break;
        case 'b':
          *dPtr = '\b';
          break;
        case 't':
          *dPtr = '\t';
          break;
        case 'r':
          *dPtr = '\r';
          break;
        case 'n':
          *dPtr = '\n';
          break;
        case 'v':
          *dPtr = '\v';
          break;
        case 'f':
          *dPtr = '\f';
          break;
        default:
          *dPtr = ch;
        }
      }
    }
  }
  *dPtr = 0;
  return dest;
}
```