user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<getword>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %esi,-0x1c(%rbp)
  mov    -0x18(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  nop
L43:
  call   <getch@plt>
  mov    %eax,-0x10(%rbp)
  mov    -0x10(%rbp),%eax
  mov    %eax,%edi
  call   <isspace@plt>
  test   %rax,%rax
  jne    L43
  cmpl   $0x2f,-0x10(%rbp)
  jne    L140
  call   <getch@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x2f,-0x10(%rbp)
  jne    L155
  nop
L31:
  call   <getch@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0xa,-0x10(%rbp)
  je     L140
  mov    D23(%rip),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x10(%rbp)
  jne    L31
  jmp    L140
L155:
  cmpl   $0x2a,-0x10(%rbp)
  jne    L140
  movl   $0x0,-0xc(%rbp)
  jmp    L91
L181:
  mov    D23(%rip),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x10(%rbp)
  jne    L39
  mov    -0x8(%rbp),%rax
  movb   $0x0,(%rax)
  mov    -0x10(%rbp),%eax
  mov    %eax,%edi
  call   <ungetch@plt>
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  jmp    L57
L39:
  call   <getch@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x2a,-0x10(%rbp)
  jne    L181
  call   <getch@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x2f,-0x10(%rbp)
  jne    L91
  movl   $0x1,-0xc(%rbp)
L91:
  cmpl   $0x0,-0xc(%rbp)
  je     L39
L140:
  cmpl   $0x22,-0x10(%rbp)
  jne    L45
  nop
L177:
  call   <getch@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x22,-0x10(%rbp)
  je     L45
  mov    D23(%rip),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x10(%rbp)
  jne    L177
L45:
  mov    -0x10(%rbp),%eax
  mov    %eax,%edi
  call   <isalpha@plt>
  test   %rax,%rax
  jne    L50
  cmpl   $0x23,-0x10(%rbp)
  je     L50
  cmpl   $0x5f,-0x10(%rbp)
  jne    L111
L50:
  subl   $0x1,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  jle    L111
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x10(%rbp),%edx
  mov    %dl,(%rax)
  jmp    L63
L64:
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x10(%rbp),%edx
  mov    %dl,(%rax)
L63:
  call   <getch@plt>
  mov    %eax,-0x10(%rbp)
  mov    -0x10(%rbp),%eax
  mov    %eax,%edi
  call   <isalnum@plt>
  test   %rax,%rax
  jne    L109
  cmpl   $0x5f,-0x10(%rbp)
  jne    L111
L109:
  subl   $0x1,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  jg     L64
L111:
  mov    D23(%rip),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x10(%rbp)
  jne    L161
  mov    -0x10(%rbp),%eax
  jmp    L57
L161:
  mov    -0x8(%rbp),%rax
  movb   $0x0,(%rax)
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
L57:
  leave
  ret
```

assistant: ```c
int getword(char *word, int lim) {
  int c, getch(void);
  void ungetch(int);
  char *w = word;
  while (isspace(c = getch()))
    ;
  if (1) {
    if (c == '/') {
      if ((c = getch()) == '/')
        while (((c = getch()) != '\n') && (c != EOF))
          ;
      else if (c == '*') {
        int done = 0;
        while (!done) {
          while ((c = getch()) != '*')
            if (c == EOF) {
              *w = '\0';
              ungetch(c);
              return word[0];
            }
          if ((c = getch()) == '/')
            done = 1;
        }
      }
    }
    if (c == '"') {
      while (((c = getch()) != '"') && (c != EOF))
        ;
    }
  }
  if ((isalpha(c) || (c == '#') || (c == '_')) && (--lim > 0)) {
    *w++ = c;
    while (((isalnum(c = getch())) || (c == '_')) && (--lim > 0))
      *w++ = c;
  }
  if (c == EOF)
    return c;
  *w = '\0';
  return word[0];
}
```