user: 请将以下的汇编代码转换成C语言代码:

```asm
<read>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x58,%rsp
  mov    %rdi,-0x58(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rbx
  movq   $0x0,-0x40(%rbp)
  movq   $0x0,-0x38(%rbp)
  movq   $0x200,-0x30(%rbp)
  mov    -0x30(%rbp),%rax
  sub    $0x1,%rax
  mov    %rax,-0x28(%rbp)
  mov    -0x30(%rbp),%rax
  mov    %rax,%r10
  mov    $0x0,%r11d
  mov    -0x30(%rbp),%rax
  mov    %rax,%r8
  mov    $0x0,%r9d
  mov    $0x10,%eax
  lea    -0x1(%rax),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  mov    $0x10,%esi
  mov    $0x0,%edx
  div    %rsi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L56:
  cmp    %rdx,%rsp
  je     L89
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L56
L89:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L46
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L46:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x20(%rbp)
  cmpq   $0x0,-0x58(%rbp)
  je     L27
  mov    -0x58(%rbp),%rax
  mov    %rax,%rdi
  call   <fgetc@plt>
  mov    %eax,-0x48(%rbp)
  movl   $0x0,-0x44(%rbp)
  jmp    L1
L61:
  mov    -0x48(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x20(%rbp),%rdx
  mov    -0x44(%rbp),%eax
  cltq
  mov    %cl,(%rdx,%rax,1)
  addl   $0x1,-0x44(%rbp)
  mov    -0x44(%rbp),%eax
  cltq
  cmp    %rax,-0x30(%rbp)
  jne    L45
  mov    -0x30(%rbp),%rax
  add    %rax,-0x38(%rbp)
  mov    -0x38(%rbp),%rdx
  mov    -0x40(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <realloc@plt>
  mov    %rax,-0x40(%rbp)
  mov    -0x38(%rbp),%rax
  sub    -0x30(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x40(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x30(%rbp),%rdx
  mov    -0x20(%rbp),%rax
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <memcpy@plt>
  movl   $0x0,-0x44(%rbp)
L45:
  mov    -0x58(%rbp),%rax
  mov    %rax,%rdi
  call   <fgetc@plt>
  mov    %eax,-0x48(%rbp)
L1:
  mov    D6(%rip),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x48(%rbp)
  jne    L61
  mov    -0x44(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  lea    0x1(%rax),%rdx
  mov    -0x40(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <realloc@plt>
  mov    %rax,-0x40(%rbp)
  mov    -0x44(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x40(%rbp),%rcx
  mov    -0x38(%rbp),%rax
  add    %rax,%rcx
  mov    -0x20(%rbp),%rax
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <memcpy@plt>
  mov    -0x44(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rax,%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
  mov    -0x40(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  je     L12
  mov    -0x40(%rbp),%rax
  jmp    L21
L12:
  mov    $0x0,%eax
  jmp    L21
L27:
  mov    $0x0,%eax
L21:
  mov    %rbx,%rsp
  mov    -0x18(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L93
  call   <__stack_chk_fail@plt>
L93:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
char *read(FILE *file) {
  char *dest = NULL;
  size_t size = 0;
  const size_t buffer_size = 512;
  char buffer[buffer_size];
  if (file) {
    int c = fgetc(file);
    int i = 0;
    while (c != EOF) {
      buffer[i] = (char)c;
      i++;
      if (i == buffer_size) {
        size += buffer_size;
        dest = realloc(dest, size);
        memcpy(dest + size - buffer_size, buffer, buffer_size);
        i = 0;
      }
      c = fgetc(file);
    }
    dest = realloc(dest, size + i + 1);
    memcpy(dest + size, buffer, i);
    dest[size + i] = '\0';
    if (strlen(dest) != 0)
      return dest;
    else
      return NULL;
  }
  return NULL;
}
```