user: Converte this assembly snippet into its equivalent C code:

```asm
<read_string>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  sub    $0x50,%rsp
  mov    %rdi,-0x1048(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movq   $0x0,-0x1020(%rbp)
  movq   $0x0,-0x1018(%rbp)
  movq   $0x0,-0x1030(%rbp)
  movq   $0x0,-0x1028(%rbp)
  movb   $0x0,-0x1031(%rbp)
  cmpq   $0x0,-0x1048(%rbp)
  jne    L70
  mov    $0x0,%eax
  jmp    L33
L70:
  mov    -0x1048(%rbp),%rax
  mov    %rax,%rdi
  call   <feof@plt>
  test   %rax,%rax
  jne    L161
  mov    -0x1048(%rbp),%rax
  mov    %rax,%rdi
  call   <ferror@plt>
  test   %rax,%rax
  je     L127
L161:
  mov    $0x0,%eax
  jmp    L33
L127:
  lea    -0x1010(%rbp),%rax
  mov    $0x1000,%edx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
  mov    -0x1048(%rbp),%rdx
  lea    -0x1010(%rbp),%rax
  mov    $0x1000,%esi
  mov    %rax,%rdi
  call   <fgets@plt>
  test   %rax,%rax
  jne    L19
  mov    $0x0,%eax
  jmp    L33
L19:
  lea    -0x1010(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %rax,-0x1020(%rbp)
  cmpq   $0x0,-0x1020(%rbp)
  je     L49
  movzbl -0x1010(%rbp),%eax
  cmp    $0xa,%al
  je     L49
  movzbl -0x1010(%rbp),%eax
  cmp    $0xd,%al
  jne    L153
L49:
  lea    D19(%rip),%rax
  jmp    L33
L153:
  mov    -0x1020(%rbp),%rax
  add    $0x2,%rax
  mov    %rax,%rdi
  call   <malloc@plt>
  mov    %rax,-0x1018(%rbp)
  cmpq   $0x0,-0x1018(%rbp)
  jne    L68
  mov    $0x0,%eax
  jmp    L33
L68:
  mov    -0x1020(%rbp),%rax
  lea    0x2(%rax),%rdx
  mov    -0x1018(%rbp),%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
  jmp    L119
L129:
  cmpb   $0xd,-0x1031(%rbp)
  je     L177
  cmpb   $0xa,-0x1031(%rbp)
  je     L177
  mov    -0x1018(%rbp),%rdx
  mov    -0x1028(%rbp),%rax
  add    %rax,%rdx
  movzbl -0x1031(%rbp),%eax
  mov    %al,(%rdx)
  addq   $0x1,-0x1028(%rbp)
L177:
  addq   $0x1,-0x1030(%rbp)
L119:
  lea    -0x1010(%rbp),%rdx
  mov    -0x1030(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  mov    %al,-0x1031(%rbp)
  cmpb   $0x0,-0x1031(%rbp)
  jne    L129
  mov    -0x1018(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %rax,-0x1020(%rbp)
  cmpq   $0x0,-0x1020(%rbp)
  jne    L87
  lea    D19(%rip),%rax
  jmp    L33
L87:
  mov    -0x1018(%rbp),%rax
L33:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L131
  call   <__stack_chk_fail@plt>
L131:
  leave
  ret
```

tool_calls: name: unpack_data
arguments: tag: D19
data_type: string

tool: 

assistant: ```c
char *read_string(FILE *fp) {
  size_t slen = 0;
  char buffer[4096];
  char *out_buffer = NULL;
  size_t idx1 = 0;
  size_t idx2 = 0;
  char c = 0;
  if (fp == NULL)
    return NULL;
  if ((feof(fp) != 0) || (ferror(fp) != 0))
    return NULL;
  memset(buffer, 0, 4096);
  if (fgets(buffer, 4096, fp) == NULL)
    return NULL;
  slen = strlen(buffer);
  if ((slen == 0) || (buffer[0] == '\n') || (buffer[0] == '\r'))
    return "";
  out_buffer = (char *)malloc(slen + 2);
  if (out_buffer == NULL)
    return NULL;
  memset(out_buffer, 0, (slen + 2));
  while ((c = buffer[idx1]) != '\0') {
    if ((c != '\r') && (c != '\n')) {
      out_buffer[idx2] = c;
      ++idx2;
    }
    ++idx1;
  }
  slen = strlen(out_buffer);
  if (slen == 0)
    return "";
  return out_buffer;
}
```