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

```asm
<echo>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  lea    -0x100000(%rsp),%r11
L12:
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  cmp    %r11,%rsp
  jne    L12
  sub    $0x78,%rsp
  mov    %edi,%r12d
  mov    %fs:0x28,%rax
  mov    %rax,0x100068(%rsp)
  xor    %eax,%eax
  movl   $0x8,0x8(%rsp)
  lea    D189(%rip),%r13
  lea    D81(%rip),%r15
  lea    D210(%rip),%r14
  jmp    L19
L67:
  lea    D137(%rip),%rdi
  call   <perror@plt>
L19:
  lea    0x60(%rsp),%rsi
  lea    0x8(%rsp),%r9
  lea    0x2c(%rsp),%r8
  mov    $0x0,%ecx
  mov    $0x100000,%edx
  mov    %r12d,%edi
  call   <recvfrom@plt>
  mov    %eax,%ebx
  mov    0x2c(%rsp),%edi
  call   <ntohs@plt>
  mov    %eax,%ebp
  mov    0x30(%rsp),%edi
  call   <inet_ntoa@plt>
  mov    %rax,%rsi
  mov    %ebp,%edx
  mov    %r13,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  test   %ebx,%ebx
  js     L67
  mov    %ebx,%esi
  mov    %r15,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    0x40(%rsp),%rbx
  mov    %r14,%rsi
  mov    %rbx,%rdi
  call   <strcpy@plt>
  lea    0x7(%rsp),%rdx
  lea    0x60(%rsp),%rdi
  mov    %rbx,%rcx
  lea    D199(%rip),%rsi
  mov    $0x0,%eax
  call   <sscanf@plt>
  movsbl 0x7(%rsp),%esi
  mov    %rbx,%rdx
  lea    D87(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movzbl 0x7(%rsp),%eax
  cmp    $0x58,%al
  je     L30
  cmp    $0x53,%al
  je     L16
  cmp    $0x52,%al
  je     L107
  cmp    $0x59,%al
  jne    L19
  lea    0x14(%rsp),%rcx
  lea    0x10(%rsp),%rdx
  lea    0x40(%rsp),%rdi
  lea    0x18(%rsp),%r8
  lea    D68(%rip),%rsi
  mov    $0x0,%eax
  call   <sscanf@plt>
  mov    0x10(%rsp),%esi
  lea    D133(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0x14(%rsp),%esi
  lea    D195(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0x18(%rsp),%esi
  lea    D97(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0x10(%rsp),%edi
  call   <get_led_duty@plt>
  mov    %eax,0x20(%rsp)
  mov    0x14(%rsp),%edi
  call   <get_led_duty@plt>
  mov    %eax,0x24(%rsp)
  mov    0x18(%rsp),%edi
  call   <get_led_duty@plt>
  mov    %eax,0x28(%rsp)
  mov    0x20(%rsp),%esi
  lea    D171(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0x24(%rsp),%esi
  lea    D153(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0x28(%rsp),%esi
  lea    D52(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0x28(%rsp),%ecx
  mov    0x24(%rsp),%edx
  mov    0x20(%rsp),%esi
  lea    D34(%rip),%rbp
  mov    %rbp,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    0x36(%rsp),%rbx
  mov    0x28(%rsp),%r8d
  mov    0x24(%rsp),%ecx
  mov    0x20(%rsp),%edx
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <sprintf@plt>
  mov    0x8(%rsp),%r9d
  lea    0x2c(%rsp),%r8
  mov    $0x0,%ecx
  mov    $0xa,%edx
  mov    %rbx,%rsi
  mov    %r12d,%edi
  call   <sendto@plt>
  jmp    L19
L30:
  lea    0x14(%rsp),%rcx
  lea    0x10(%rsp),%rdx
  mov    %rbx,%rdi
  lea    0x28(%rsp),%rax
  push   %rax
  lea    0x2c(%rsp),%rax
  push   %rax
  lea    0x30(%rsp),%r9
  lea    0x28(%rsp),%r8
  lea    D47(%rip),%rsi
  mov    $0x0,%eax
  call   <sscanf@plt>
  mov    0x30(%rsp),%edx
  mov    0x20(%rsp),%esi
  lea    D23(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0x34(%rsp),%edx
  mov    0x24(%rsp),%esi
  lea    D70(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0x38(%rsp),%edx
  mov    0x28(%rsp),%esi
  lea    D188(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0x30(%rsp),%esi
  mov    0x20(%rsp),%edi
  call   <led@plt>
  mov    0x34(%rsp),%esi
  mov    0x24(%rsp),%edi
  call   <led@plt>
  mov    0x38(%rsp),%esi
  mov    0x28(%rsp),%edi
  call   <led@plt>
  add    $0x10,%rsp
  jmp    L19
L16:
  lea    0x1c(%rsp),%rcx
  lea    0xc(%rsp),%rdx
  lea    0x40(%rsp),%rdi
  lea    D156(%rip),%rsi
  mov    $0x0,%eax
  call   <sscanf@plt>
  mov    0x1c(%rsp),%edx
  mov    0xc(%rsp),%esi
  lea    D152(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0x1c(%rsp),%esi
  mov    0xc(%rsp),%edi
  call   <led@plt>
  jmp    L19
L107:
  lea    0xc(%rsp),%rdx
  lea    0x40(%rsp),%rdi
  lea    D197(%rip),%rsi
  mov    $0x0,%eax
  call   <sscanf@plt>
  mov    0xc(%rsp),%esi
  lea    D100(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0xc(%rsp),%edi
  call   <get_led_duty@plt>
  mov    %eax,%edx
  mov    %eax,0x1c(%rsp)
  lea    0x36(%rsp),%rbx
  lea    D30(%rip),%rsi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <sprintf@plt>
  mov    0x8(%rsp),%r9d
  lea    0x2c(%rsp),%r8
  mov    $0x0,%ecx
  mov    $0x4,%edx
  mov    %rbx,%rsi
  mov    %r12d,%edi
  call   <sendto@plt>
  jmp    L19
```

tool_calls: name: parse_data
arguments: data_label: D189
type: string
name: parse_data
arguments: data_label: D81
type: string
name: parse_data
arguments: data_label: D210
type: string
name: parse_data
arguments: data_label: D137
type: string
name: parse_data
arguments: data_label: D199
type: string
name: parse_data
arguments: data_label: D87
type: string
name: parse_data
arguments: data_label: D68
type: string
name: parse_data
arguments: data_label: D133
type: string
name: parse_data
arguments: data_label: D195
type: string
name: parse_data
arguments: data_label: D97
type: string
name: parse_data
arguments: data_label: D171
type: string
name: parse_data
arguments: data_label: D153
type: string
name: parse_data
arguments: data_label: D52
type: string
name: parse_data
arguments: data_label: D34
type: string
name: parse_data
arguments: data_label: D47
type: string
name: parse_data
arguments: data_label: D23
type: string
name: parse_data
arguments: data_label: D70
type: string
name: parse_data
arguments: data_label: D188
type: string
name: parse_data
arguments: data_label: D156
type: string
name: parse_data
arguments: data_label: D152
type: string
name: parse_data
arguments: data_label: D197
type: string
name: parse_data
arguments: data_label: D100
type: string
name: parse_data
arguments: data_label: D30
type: string

tool: D189: Got a datagram from %s port %d


tool: D81: GOT %d BYTES


tool: 

tool: D137: Error receiving data

tool: D199: %c%s

tool: D87: cmd:%c-arg:%s


tool: D68: %3d%3d%3d

tool: D133: read rchan: %03d


tool: D195: read gchan: %03d


tool: D97: read bchan: %03d


tool: D171: read rval: %03d


tool: D153: read gval: %03d


tool: D52: read bval: %03d


tool: D34: %03d%03d%03d


tool: D47: %3d%3d%3d%3d%3d%3d

tool: D23: rchan: %d rval: %d


tool: D70: gchan: %d gval: %d


tool: D188: bchan: %d bval: %d


tool: D156: %3d%3d

tool: D152: chan: %d val: %d


tool: D197: %3d

tool: D100: read chan: %03d


tool: D30: %03d


assistant: ```c
void echo(int sd) {
  int len, n;
  char bufin[1024 * 1024];
  char cmd;
  char arg[20];
  char str_val[10];
  struct sockaddr_in remote;
  int chan, rchan, gchan, bchan;
  int val, rval, gval, bval;
  len = sizeof(remote);
  while (1) {
    n = recvfrom(sd, bufin, 1024 * 1024, 0, (struct sockaddr *)&remote, &len);
    printf("Got a datagram from %s port %d\n", inet_ntoa(remote.sin_addr), ntohs(remote.sin_port));
    if (n < 0) {
      perror("Error receiving data");
    } else {
      printf("GOT %d BYTES\n", n);
      strcpy(arg, "");
      sscanf(bufin, "%c%s", &cmd, &arg);
      printf("cmd:%c-arg:%s\n", cmd, arg);
      if (cmd == 'X') {
        sscanf(arg, "%3d%3d%3d%3d%3d%3d", &rchan, &gchan, &bchan, &rval, &gval, &bval);
        printf("rchan: %d rval: %d\n", rchan, rval);
        printf("gchan: %d gval: %d\n", gchan, gval);
        printf("bchan: %d bval: %d\n", bchan, bval);
        led(rchan, rval);
        led(gchan, gval);
        led(bchan, bval);
      } else if (cmd == 'S') {
        sscanf(arg, "%3d%3d", &chan, &val);
        printf("chan: %d val: %d\n", chan, val);
        led(chan, val);
      } else if (cmd == 'R') {
        sscanf(arg, "%3d", &chan);
        printf("read chan: %03d\n", chan);
        val = get_led_duty(chan);
        sprintf(str_val, "%03d\n", val);
        sendto(sd, str_val, 4, 0, (struct sockaddr *)&remote, len);
      } else if (cmd == 'Y') {
        sscanf(arg, "%3d%3d%3d", &rchan, &gchan, &bchan);
        printf("read rchan: %03d\n", rchan);
        printf("read gchan: %03d\n", gchan);
        printf("read bchan: %03d\n", bchan);
        rval = get_led_duty(rchan);
        gval = get_led_duty(gchan);
        bval = get_led_duty(bchan);
        printf("read rval: %03d\n", rval);
        printf("read gval: %03d\n", gval);
        printf("read bval: %03d\n", bval);
        printf("%03d%03d%03d\n", rval, gval, bval);
        sprintf(str_val, "%03d%03d%03d\n", rval, gval, bval);
        sendto(sd, str_val, 10, 0, (struct sockaddr *)&remote, len);
      }
    }
  }
}
```