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

```asm
<echo>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  lea    -0x100000(%rsp),%r11
L17:
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  cmp    %r11,%rsp
  jne    L17
  sub    $0xd8,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x1000c8(%rsp)
  xor    %eax,%eax
  lea    0x67(%rsp),%rax
  mov    %edi,%r12d
  movl   $0x8,0x68(%rsp)
  mov    %rax,0x10(%rsp)
  lea    0x80(%rsp),%rax
  lea    0x68(%rsp),%r15
  mov    %rax,0x40(%rsp)
  lea    0x78(%rsp),%rax
  lea    0x8c(%rsp),%r13
  mov    %rax,0x28(%rsp)
  lea    0x74(%rsp),%rax
  lea    0xc0(%rsp),%rbp
  mov    %rax,0x20(%rsp)
  lea    0x70(%rsp),%rax
  lea    0xa0(%rsp),%rbx
  mov    %rax,0x18(%rsp)
  lea    0x88(%rsp),%rax
  mov    %rax,0x50(%rsp)
  lea    0x84(%rsp),%rax
  mov    %rax,0x48(%rsp)
  lea    0x7c(%rsp),%rax
  mov    %rax,0x58(%rsp)
  lea    0x6c(%rsp),%rax
  mov    %rax,0x30(%rsp)
  lea    0x96(%rsp),%rax
  mov    %rax,0x38(%rsp)
  nopl   0x0(%rax)
L21:
  xor    %ecx,%ecx
  mov    $0x100000,%edx
  mov    %rbp,%rsi
  mov    %r15,%r9
  mov    %r13,%r8
  mov    %r12d,%edi
  call   <recvfrom@plt>
  mov    0x8c(%rsp),%edi
  mov    %eax,%r14d
  call   <ntohs@plt>
  mov    0x90(%rsp),%edi
  mov    %eax,0xc(%rsp)
  call   <inet_ntoa@plt>
  mov    0xc(%rsp),%edx
  lea    D111(%rip),%rdi
  mov    %rax,%rsi
  xor    %eax,%eax
  call   <printf@plt>
  test   %r14d,%r14d
  jns    L34
  lea    D28(%rip),%rdi
  call   <perror@plt>
  jmp    L21
  nop
L34:
  mov    %r14d,%esi
  lea    D165(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    D56(%rip),%rsi
  mov    %rbx,%rdi
  call   <strcpy@plt>
  mov    0x10(%rsp),%rdx
  mov    %rbx,%rcx
  mov    %rbp,%rdi
  lea    D154(%rip),%rsi
  xor    %eax,%eax
  call   <sscanf@plt>
  movsbl 0x67(%rsp),%esi
  mov    %rbx,%rdx
  xor    %eax,%eax
  lea    D191(%rip),%rdi
  call   <printf@plt>
  movzbl 0x67(%rsp),%eax
  cmp    $0x58,%al
  je     L26
  cmp    $0x53,%al
  je     L29
  cmp    $0x52,%al
  je     L105
  cmp    $0x59,%al
  jne    L21
  mov    0x28(%rsp),%r8
  mov    0x20(%rsp),%rcx
  mov    %rbx,%rdi
  xor    %eax,%eax
  mov    0x18(%rsp),%rdx
  lea    D61(%rip),%rsi
  call   <sscanf@plt>
  mov    0x70(%rsp),%esi
  lea    D33(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x74(%rsp),%esi
  lea    D24(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x78(%rsp),%esi
  lea    D36(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x70(%rsp),%edi
  call   <get_led_duty@plt>
  mov    0x74(%rsp),%edi
  mov    %eax,0x80(%rsp)
  call   <get_led_duty@plt>
  mov    0x78(%rsp),%edi
  mov    %eax,0x84(%rsp)
  call   <get_led_duty@plt>
  mov    0x80(%rsp),%esi
  lea    D62(%rip),%rdi
  mov    %eax,0x88(%rsp)
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x84(%rsp),%esi
  lea    D180(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x88(%rsp),%esi
  lea    D171(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x88(%rsp),%ecx
  xor    %eax,%eax
  mov    0x84(%rsp),%edx
  mov    0x80(%rsp),%esi
  lea    D187(%rip),%rdi
  call   <printf@plt>
  mov    0x38(%rsp),%r14
  xor    %eax,%eax
  mov    0x88(%rsp),%r8d
  mov    0x84(%rsp),%ecx
  mov    0x80(%rsp),%edx
  lea    D187(%rip),%rsi
  mov    %r14,%rdi
  call   <sprintf@plt>
  mov    0x68(%rsp),%r9d
  mov    %r13,%r8
  xor    %ecx,%ecx
  mov    $0xa,%edx
  mov    %r14,%rsi
  mov    %r12d,%edi
  call   <sendto@plt>
  jmp    L21
  nopw   0x0(%rax,%rax,1)
L26:
  push   0x50(%rsp)
  lea    D173(%rip),%rsi
  mov    %rbx,%rdi
  xor    %eax,%eax
  push   0x50(%rsp)
  mov    0x50(%rsp),%r9
  mov    0x38(%rsp),%r8
  mov    0x30(%rsp),%rcx
  mov    0x28(%rsp),%rdx
  call   <sscanf@plt>
  mov    0x90(%rsp),%edx
  mov    0x80(%rsp),%esi
  xor    %eax,%eax
  lea    D27(%rip),%rdi
  call   <printf@plt>
  mov    0x94(%rsp),%edx
  mov    0x84(%rsp),%esi
  xor    %eax,%eax
  lea    D100(%rip),%rdi
  call   <printf@plt>
  mov    0x98(%rsp),%edx
  mov    0x88(%rsp),%esi
  xor    %eax,%eax
  lea    D92(%rip),%rdi
  call   <printf@plt>
  mov    0x90(%rsp),%esi
  mov    0x80(%rsp),%edi
  call   <led@plt>
  mov    0x94(%rsp),%esi
  mov    0x84(%rsp),%edi
  call   <led@plt>
  mov    0x98(%rsp),%esi
  mov    0x88(%rsp),%edi
  call   <led@plt>
  pop    %rax
  pop    %rdx
  jmp    L21
  nopl   0x0(%rax)
L29:
  mov    0x58(%rsp),%rcx
  mov    0x30(%rsp),%rdx
  mov    %rbx,%rdi
  xor    %eax,%eax
  lea    D101(%rip),%rsi
  call   <sscanf@plt>
  mov    0x6c(%rsp),%esi
  mov    0x7c(%rsp),%edx
  xor    %eax,%eax
  lea    D37(%rip),%rdi
  call   <printf@plt>
  mov    0x7c(%rsp),%esi
  mov    0x6c(%rsp),%edi
  call   <led@plt>
  jmp    L21
  nopl   0x0(%rax,%rax,1)
L105:
  mov    0x30(%rsp),%rdx
  mov    %rbx,%rdi
  lea    D203(%rip),%rsi
  xor    %eax,%eax
  call   <sscanf@plt>
  mov    0x6c(%rsp),%esi
  lea    D189(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    0x6c(%rsp),%edi
  call   <get_led_duty@plt>
  mov    0x38(%rsp),%r14
  lea    D235(%rip),%rsi
  mov    %eax,0x7c(%rsp)
  mov    %eax,%edx
  xor    %eax,%eax
  mov    %r14,%rdi
  call   <sprintf@plt>
  mov    0x68(%rsp),%r9d
  mov    %r13,%r8
  xor    %ecx,%ecx
  mov    $0x4,%edx
  mov    %r14,%rsi
  mov    %r12d,%edi
  call   <sendto@plt>
  jmp    L21
```

tool_calls: name: read_data
arguments: label: D111
datatype: string
name: read_data
arguments: label: D28
datatype: string
name: read_data
arguments: label: D165
datatype: string
name: read_data
arguments: label: D56
datatype: string
name: read_data
arguments: label: D154
datatype: string
name: read_data
arguments: label: D191
datatype: string
name: read_data
arguments: label: D61
datatype: string
name: read_data
arguments: label: D33
datatype: string
name: read_data
arguments: label: D24
datatype: string
name: read_data
arguments: label: D36
datatype: string
name: read_data
arguments: label: D62
datatype: string
name: read_data
arguments: label: D180
datatype: string
name: read_data
arguments: label: D171
datatype: string
name: read_data
arguments: label: D187
datatype: string
name: read_data
arguments: label: D173
datatype: string
name: read_data
arguments: label: D27
datatype: string
name: read_data
arguments: label: D100
datatype: string
name: read_data
arguments: label: D92
datatype: string
name: read_data
arguments: label: D101
datatype: string
name: read_data
arguments: label: D37
datatype: string
name: read_data
arguments: label: D203
datatype: string
name: read_data
arguments: label: D189
datatype: string
name: read_data
arguments: label: D235
datatype: string

tool: D111: Got a datagram from %s port %d


tool: D28: Error receiving data

tool: D165: GOT %d BYTES


tool: 

tool: D154: %c%s

tool: D191: cmd:%c-arg:%s


tool: D61: %3d%3d%3d

tool: D33: read rchan: %03d


tool: D24: read gchan: %03d


tool: D36: read bchan: %03d


tool: D62: read rval: %03d


tool: D180: read gval: %03d


tool: D171: read bval: %03d


tool: D187: %03d%03d%03d


tool: D173: %3d%3d%3d%3d%3d%3d

tool: D27: rchan: %d rval: %d


tool: D100: gchan: %d gval: %d


tool: D92: bchan: %d bval: %d


tool: D101: %3d%3d

tool: D37: chan: %d val: %d


tool: D203: %3d

tool: D189: read chan: %03d


tool: D235: %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);
      }
    }
  }
}
```