user: What is the c source code of the assembly code below?

```asm
<read_packet>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %edi,-0x24(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0x1c(%rbp)
  movl   $0x0,-0x14(%rbp)
  movl   $0x0,-0x18(%rbp)
  jmp    L130
L61:
  mov    -0x18(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
  addl   $0x1,-0x18(%rbp)
L130:
  cmpl   $0xd,-0x18(%rbp)
  jle    L61
  movl   $0x0,-0x18(%rbp)
  jmp    L110
L5:
  lea    -0x1c(%rbp),%rcx
  mov    -0x24(%rbp),%eax
  mov    $0x1,%edx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <read@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x0,-0x10(%rbp)
  jg     L68
  lea    D32(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0x0,%edi
  call   <exit@plt>
L68:
  mov    -0x1c(%rbp),%eax
  test   %eax,%eax
  jne    L40
  lea    D21(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0xffffffff,%eax
  jmp    L3
L40:
  mov    -0x1c(%rbp),%eax
  sar    $0x4,%eax
  and    $0xf,%eax
  mov    %eax,-0xc(%rbp)
  cmpl   $0x0,-0xc(%rbp)
  je     L112
  cmpl   $0xf,-0xc(%rbp)
  jne    L133
L112:
  mov    -0x1c(%rbp),%eax
  mov    %eax,%esi
  lea    D19(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0xffffffff,%eax
  jmp    L3
L133:
  mov    -0x1c(%rbp),%eax
  mov    %eax,%edx
  mov    -0xc(%rbp),%eax
  cltq
  lea    -0x1(%rax),%rcx
  mov    -0x30(%rbp),%rax
  add    %rcx,%rax
  and    $0xf,%edx
  mov    %dl,(%rax)
  addl   $0x1,-0x14(%rbp)
  cmpl   $0xe,-0xc(%rbp)
  jne    L57
  cmpl   $0xc,-0x14(%rbp)
  jg     L76
  mov    -0x14(%rbp),%eax
  mov    %eax,%esi
  lea    D29(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0xffffffff,%eax
  jmp    L3
L76:
  mov    $0x0,%eax
  jmp    L3
L57:
  addl   $0x1,-0x18(%rbp)
L110:
  cmpl   $0xe,-0x18(%rbp)
  jle    L5
  lea    D4(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0xffffffff,%eax
L3:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L80
  call   <__stack_chk_fail@plt>
L80:
  leave
  ret
```

tool_calls: name: disassemble_data
arguments: data_label: D32
type_infered: string
name: disassemble_data
arguments: data_label: D21
type_infered: string
name: disassemble_data
arguments: data_label: D19
type_infered: string
name: disassemble_data
arguments: data_label: D29
type_infered: string
name: disassemble_data
arguments: data_label: D4
type_infered: string

tool: D32: Read EOF

tool: D21: Meter ON.

tool: D19: Read invalid byte 0x%02X


tool: D29: Only read %d bytes of packet.


tool: D4: Read too many bytes.

assistant: ```c
int read_packet(int fd, unsigned char *buf) {
  int x;
  int n;
  int byte = 0;
  int idx;
  int bytes_read = 0;
  for (x = 0; x < 14; x++)
    buf[x] = 0;
  for (x = 0; x < 15; x++) {
    n = read(fd, &byte, 1);
    if (n <= 0) {
      printf("Read EOF\n");
      exit(0);
    }
    if (byte == 0) {
      printf("Meter ON.\n");
      return -1;
    }
    idx = (byte >> 4) & 0xF;
    if ((idx == 0) || (idx == 0xF)) {
      printf("Read invalid byte 0x%02X\n", byte);
      return -1;
    }
    buf[idx - 1] = byte & 0xF;
    bytes_read++;
    if (idx == 0xE) {
      if (bytes_read < 13) {
        printf("Only read %d bytes of packet.\n", bytes_read);
        return -1;
      } else
        return 0;
    }
  }
  printf("Read too many bytes.\n");
  return -1;
}
```