user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<getstr>:
  endbr64
  push   %r12
  push   %rbp
  push   %rbx
  test   %rdi,%rdi
  je     L62
  mov    %rdi,D143(%rip)
L250:
  test   %rdi,%rdi
  setne  %dil
  movzbl %dil,%edi
  call   <assert@plt>
  mov    D143(%rip),%rax
  movsbl (%rax),%edi
  test   %dil,%dil
  jne    L220
  jmp    L19
  nopl   0x0(%rax)
L177:
  mov    %rax,%rdx
  add    $0x1,%rax
  movsbl 0x1(%rdx),%edi
  mov    %rax,D106(%rip)
  test   %dil,%dil
  je     L19
L220:
  call   <isspace@plt>
  test   %rax,%rax
  mov    D106(%rip),%rax
  jne    L177
  movsbl (%rax),%edi
  cmp    $0x22,%dil
  je     L164
  cmp    $0x7b,%dil
  jne    L299
  lea    0x1(%rax),%rdx
  movzbl 0x1(%rax),%eax
  mov    %rdx,D106(%rip)
  cmp    $0x7d,%al
  je     L298
  test   %al,%al
  je     L298
  mov    $0x1,%r12d
  lea    D106(%rip),%rbp
  jmp    L42
  nopl   0x0(%rax)
L287:
  cmp    $0x7d,%al
  je     L2
L42:
  mov    %al,0x0(%rbp,%r12,1)
  add    $0x1,%rdx
  xor    %edi,%edi
  mov    %r12d,%ebx
  cmp    $0xff,%r12d
  mov    %rdx,D213(%rip)
  setle  %dil
  add    $0x1,%r12
  call   <assert@plt>
  mov    D213(%rip),%rdx
  movzbl (%rdx),%eax
  test   %al,%al
  jne    L287
  nopl   0x0(%rax,%rax,1)
L2:
  lea    D213(%rip),%r12
L227:
  movslq %ebx,%rbx
  movb   $0x0,(%r12,%rbx,1)
  cmpb   $0x0,(%rdx)
  je     L306
  movzbl D213(%rip),%eax
  add    $0x1,%rdx
  mov    %rdx,D70(%rip)
  test   %al,%al
  je     L169
L325:
  lea    D70(%rip),%rdx
  xor    %ecx,%ecx
  nop
L48:
  lea    -0x3b(%rax),%esi
  cmp    $0x1,%sil
  jbe    L84
  movslq %ecx,%rsi
  add    $0x1,%ecx
  mov    %al,(%r12,%rsi,1)
L84:
  movzbl (%rdx),%eax
  add    $0x1,%rdx
  test   %al,%al
  jne    L48
  test   %ecx,%ecx
  je     L169
  movslq %ecx,%rcx
  movb   $0x0,(%r12,%rcx,1)
L169:
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
  nopw   0x0(%rax,%rax,1)
L164:
  movsbl 0x1(%rax),%edi
  lea    0x1(%rax),%rdx
  mov    %rdx,D11(%rip)
  cmp    $0x22,%dil
  je     L298
  test   %dil,%dil
  je     L298
  mov    $0x1,%r12d
  lea    D106(%rip),%rbp
  nop
L272:
  call   <isspace@plt>
  mov    $0x5f,%edx
  test   %rax,%rax
  mov    D11(%rip),%rax
  jne    L202
  movzbl (%rax),%edx
L202:
  mov    %dl,0x0(%rbp,%r12,1)
  add    $0x1,%rax
  xor    %edi,%edi
  mov    %r12d,%ebx
  cmp    $0xff,%r12d
  mov    %rax,D11(%rip)
  setle  %dil
  add    $0x1,%r12
  call   <assert@plt>
  mov    D11(%rip),%rdx
  movsbl (%rdx),%edi
  test   %dil,%dil
  je     L2
  cmp    $0x22,%dil
  jne    L272
  jmp    L2
L299:
  cmp    $0x3b,%dil
  jne    L288
L19:
  mov    %rax,%rdx
L298:
  xor    %ebx,%ebx
  jmp    L2
L306:
  movzbl D213(%rip),%eax
  test   %al,%al
  jne    L325
  jmp    L169
  nopl   0x0(%rax)
L62:
  mov    D11(%rip),%rdi
  jmp    L250
L288:
  test   %dil,%dil
  je     L19
  lea    D213(%rip),%r12
  xor    %ebx,%ebx
  mov    %r12,%rbp
  jmp    L161
  nopw   0x0(%rax,%rax,1)
L178:
  movzbl (%rdx),%eax
  cmp    $0x2c,%al
  je     L227
  mov    %al,0x0(%rbp)
  add    $0x1,%ebx
  add    $0x1,%rdx
  xor    %edi,%edi
  cmp    $0xff,%ebx
  mov    %rdx,D11(%rip)
  setle  %dil
  add    $0x1,%rbp
  call   <assert@plt>
  mov    D11(%rip),%rdx
  movsbl (%rdx),%edi
  test   %dil,%dil
  je     L227
L161:
  call   <isspace@plt>
  mov    D11(%rip),%rdx
  test   %rax,%rax
  je     L178
  jmp    L227
```

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;
}
```