user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<readfile>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  jne    L13
  lea    D6(%rip),%rax
  mov    %rax,%rdi
  call   <error@plt>
  mov    $0x1,%edi
  call   <exit@plt>
L13:
  movl   $0x0,-0x20(%rbp)
  movl   $0x10,-0x1c(%rbp)
  mov    -0x1c(%rbp),%eax
  cltq
  shl    $0x3,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x18(%rbp)
  mov    $0x200,%edi
  call   <malloc@plt>
  mov    %rax,-0x10(%rbp)
  mov    $0x200,%edi
  call   <malloc@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  movb   $0x0,(%rax)
  jmp    L3
L58:
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <obfuscate@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rdx
  mov    -0x8(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcat@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  cltq
  lea    -0x1(%rax),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x5c,%al
  je     L16
  mov    -0x20(%rbp),%eax
  cmp    -0x1c(%rbp),%eax
  jl     L59
  addl   $0x10,-0x1c(%rbp)
  mov    -0x1c(%rbp),%eax
  cltq
  shl    $0x3,%eax
  mov    %eax,%edx
  mov    -0x18(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <realloc@plt>
  mov    %rax,-0x18(%rbp)
L59:
  mov    -0x20(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rax,%rdx
  mov    -0x8(%rbp),%rax
  mov    %rax,(%rdx)
  addl   $0x1,-0x20(%rbp)
  mov    $0x200,%edi
  call   <malloc@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  movb   $0x0,(%rax)
  jmp    L51
L16:
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  cltq
  lea    -0x1(%rax),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
L51:
  mov    $0x200,%edi
  call   <malloc@plt>
  mov    %rax,-0x10(%rbp)
L3:
  mov    -0x28(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  mov    $0x200,%esi
  mov    %rax,%rdi
  call   <fgets@plt>
  test   %rax,%rax
  jne    L58
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <ferror@plt>
  test   %rax,%rax
  je     L12
  lea    D7(%rip),%rax
  mov    %rax,%rdi
  call   <error@plt>
  mov    $0x1,%edi
  call   <exit@plt>
L12:
  mov    -0x20(%rbp),%edx
  mov    -0x30(%rbp),%rax
  mov    %edx,(%rax)
  mov    -0x18(%rbp),%rax
  leave
  ret
```

tool_calls: name: retrieve_data
arguments: tag: D6
type_infered: string
name: retrieve_data
arguments: tag: D7
type_infered: string

tool: D6: error: cannot open file


tool: D7: error: cannot read file


assistant: ```c
char **readfile(FILE *fin, unsigned int *length) {
  if (fin == NULL) {
    error("error: cannot open file\n");
    exit(1);
  }
  int lines_length = 0;
  int lines_alloc = 16;
  char **lines = malloc(lines_alloc * sizeof(char *));
  char *line = malloc(512 * sizeof(char));
  char *bigline = malloc(512 * sizeof(char));
  bigline[0] = '\0';
  while (fgets(line, 512 * sizeof(char), fin)) {
    line = obfuscate(line);
    bigline = strcat(bigline, line);
    if (line[strlen(line) - 1] != '\\') {
      if (lines_length >= lines_alloc) {
        lines_alloc += 16;
        lines = realloc(lines, lines_alloc * sizeof(char *));
      }
      lines[lines_length] = bigline;
      lines_length++;
      bigline = malloc(512 * sizeof(char));
      bigline[0] = '\0';
    } else {
      bigline[strlen(bigline) - 1] = '\0';
    }
    line = malloc(512 * sizeof(char));
  }
  if (ferror(fin)) {
    error("error: cannot read file\n");
    exit(1);
  }
  *length = lines_length;
  return lines;
}
```