user: 请将以下的汇编代码转换成C语言代码：

```asm
<getstr>:
  endbr64
  push   %r12
  push   %rbp
  push   %rbx
  test   %rdi,%rdi
  je     L167
  mov    %rdi,D0(%rip)
L236:
  test   %rdi,%rdi
  setne  %dil
  movzbl %dil,%edi
  call   <assert@plt>
  mov    D0(%rip),%rax
  movsbl (%rax),%edi
  test   %dil,%dil
  jne    L8
  jmp    L257
  nopl   0x0(%rax)
L97:
  movsbl 0x1(%rdx),%edi
  lea    0x1(%rdx),%rax
  mov    %rax,D83(%rip)
  test   %dil,%dil
  je     L257
L8:
  call   <isspace@plt>
  mov    D83(%rip),%rdx
  test   %rax,%rax
  jne    L97
  movsbl (%rdx),%edi
  cmp    $0x22,%dil
  je     L130
  cmp    $0x7b,%dil
  jne    L289
  lea    0x1(%rdx),%rax
  movzbl 0x1(%rdx),%edx
  mov    %rax,D83(%rip)
  cmp    $0x7d,%dl
  je     L257
  test   %dl,%dl
  je     L257
  mov    $0x1,%r12d
  lea    D83(%rip),%rbp
  jmp    L104
  nop
L314:
  cmp    $0x7d,%dl
  je     L52
L104:
  mov    %dl,0x0(%rbp,%r12,1)
  add    $0x1,%rax
  xor    %edi,%edi
  mov    %r12d,%ebx
  cmp    $0xff,%r12d
  mov    %rax,D144(%rip)
  setle  %dil
  add    $0x1,%r12
  call   <assert@plt>
  mov    D144(%rip),%rax
  movzbl (%rax),%edx
  test   %dl,%dl
  jne    L314
  nopl   0x0(%rax)
L52:
  lea    D144(%rip),%r12
L221:
  movslq %ebx,%rbx
  movb   $0x0,(%r12,%rbx,1)
  cmpb   $0x0,(%rax)
  je     L217
  add    $0x1,%rax
  mov    %rax,D20(%rip)
  movzbl D144(%rip),%eax
  test   %al,%al
  je     L135
L294:
  lea    D20(%rip),%rdx
  xor    %ecx,%ecx
  nopw   0x0(%rax,%rax,1)
L177:
  lea    -0x3b(%rax),%esi
  cmp    $0x1,%sil
  jbe    L108
  movslq %ecx,%rsi
  add    $0x1,%rdx
  add    $0x1,%ecx
  mov    %al,(%r12,%rsi,1)
  movzbl -0x1(%rdx),%eax
  test   %al,%al
  jne    L177
L319:
  movslq %ecx,%rcx
  movb   $0x0,(%r12,%rcx,1)
L135:
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
  nopl   0x0(%rax,%rax,1)
L130:
  movsbl 0x1(%rdx),%edi
  lea    0x1(%rdx),%rax
  mov    %rax,D120(%rip)
  cmp    $0x22,%dil
  je     L257
  test   %dil,%dil
  je     L257
  mov    $0x1,%r12d
  lea    D83(%rip),%rbp
  nop
L305:
  call   <isspace@plt>
  mov    $0x5f,%edx
  test   %rax,%rax
  mov    D120(%rip),%rax
  jne    L194
  movzbl (%rax),%edx
L194:
  mov    %dl,0x0(%rbp,%r12,1)
  add    $0x1,%rax
  xor    %edi,%edi
  mov    %r12d,%ebx
  cmp    $0xff,%r12d
  mov    %rax,D120(%rip)
  setle  %dil
  add    $0x1,%r12
  call   <assert@plt>
  mov    D120(%rip),%rax
  movsbl (%rax),%edi
  test   %dil,%dil
  je     L52
  cmp    $0x22,%dil
  jne    L305
  jmp    L52
L289:
  cmp    $0x3b,%dil
  jne    L291
L342:
  mov    %rdx,%rax
L257:
  xor    %ebx,%ebx
  jmp    L52
L108:
  movzbl (%rdx),%eax
  add    $0x1,%rdx
  test   %al,%al
  jne    L177
  test   %ecx,%ecx
  jne    L319
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
  nop
L217:
  movzbl D144(%rip),%eax
  test   %al,%al
  jne    L294
  jmp    L135
  nopl   0x0(%rax)
L167:
  mov    D120(%rip),%rdi
  jmp    L236
L291:
  test   %dil,%dil
  je     L342
  lea    D144(%rip),%r12
  xor    %ebx,%ebx
  mov    %r12,%rbp
  jmp    L94
  nopw   0x0(%rax,%rax,1)
L265:
  movzbl (%rax),%edx
  cmp    $0x2c,%dl
  je     L221
  mov    %dl,0x0(%rbp)
  add    $0x1,%ebx
  add    $0x1,%rax
  xor    %edi,%edi
  cmp    $0xff,%ebx
  mov    %rax,D120(%rip)
  setle  %dil
  add    $0x1,%rbp
  call   <assert@plt>
  mov    D120(%rip),%rax
  movsbl (%rax),%edi
  test   %dil,%dil
  je     L221
L94:
  call   <isspace@plt>
  test   %rax,%rax
  mov    D120(%rip),%rax
  je     L265
  jmp    L221
```

assistant: ```c
char *getstr(char *s) {
  static char *s1;
  static char buf[256];
  int i, j;
  if (s)
    s1 = s;
  assert(s1 != NULL);
  i = 0;
  for (; *s1 && isspace(*s1); s1++)
    ;
  if (*s1 == '"') {
    for (s1++; *s1 && *s1 != '"';) {
      buf[i] = isspace(*s1) ? '_' : *s1;
      s1++;
      i++;
      assert(i < 256);
    }
  } else if (*s1 == '{') {
    for (s1++; *s1 && *s1 != '}';) {
      buf[i] = *s1;
      s1++;
      i++;
      assert(i < 256);
    }
  } else {
    if (*s1 != ';') {
      for (; *s1 && !isspace(*s1) && *s1 != ',';) {
        buf[i] = *s1;
        s1++;
        i++;
        assert(i < 256);
      }
    }
  }
  buf[i] = '\0';
  if (*s1)
    s1++;
  i = 0;
  j = 0;
  while (buf[j] && j < 256) {
    if (buf[j] != ';' && buf[j] != '<') {
      buf[i] = buf[j];
      i++;
    }
    j++;
  }
  if (i)
    buf[i] = '\0';
  return buf;
}
```